wiringPi Version 2 - First commit (of v2)

INSTALL

@@ -30,18 +30,6 @@ To un-install wiringPi:
 
   ./build uninstall
 
-
-I2C:
-
-If your system has the correct i2c-dev libraries and headers installed,
-then the I2C helpers will be compiled into wiringPi. If you want to
-use the I2C helpers and don't have them installed, then under Raspbian,
-issue the command:
-
-  sudo apt-get install libi2c-dev
-
-Consult the documentation for your system if you are not running Raspbian.
-
 Gordon Henderson
 
 projects@drogon.net

README.TXT

@@ -16,7 +16,7 @@ accepted to Github....
 
 Please see
 
-  https://projects.drogon.net/raspberry-pi/wiringpi/
+  http://wiringpi.com/
 
 for the official documentation, etc. and the best way to submit bug reports, etc.
 is by sending an email to projects@drogon.net

build

@@ -14,28 +14,28 @@ check-make-ok()
 }
 
 if [ x$1 = "xclean" ]; then
-  echo Cleaning
-  echo
   cd wiringPi
-  make clean
+  echo -n "wiringPi:  "	; make clean
+  cd ../devLib
+  echo -n "DevLib:    "	; make clean
   cd ../gpio
-  make clean
+  echo -n "gpio:      "	; make clean
   cd ../examples
-  make clean
+  echo -n "Examples:  "	; make clean
+  cd Gertboard
+  echo -n "Gertboard: "	; make clean
+  cd ../PiFace
+  echo -n "PiFace:    "	; make clean
   exit
 fi
 
 if [ x$1 = "xuninstall" ]; then
-  echo Uninstalling
-  echo
-  echo "WiringPi library"
   cd wiringPi
-  sudo make uninstall
-  echo
-  echo "GPIO Utility"
+  echo -n "wiringPi: " ; sudo make uninstall
+  cd ../devLib
+  echo -n "DevLib:   " ; sudo make uninstall
   cd ../gpio
-  sudo make uninstall
-  cd ..
+  echo -n "gpio:     " ; sudo make uninstall
   exit
 fi
 
@@ -44,25 +44,20 @@ fi
   echo "====================="
   echo
 
-# Check for I2C being installed...
-#	... and if-so, then automatically make the I2C helpers
-
-  if [ -f /usr/include/linux/i2c-dev.h ]; then
-    grep -q i2c_smbus_read_byte /usr/include/linux/i2c-dev.h
-    if [ $? = 0 ]; then
-      target=i2c
-      echo "Building wiringPi with the I2C helper libraries."
-    else
-      target=all
-      echo "The wiringPi I2C helper libraries will not be built."
-    fi
-  fi
-
   echo
-  echo "WiringPi library"
+  echo "WiringPi Library"
   cd wiringPi
   sudo make uninstall
-  make $target
+  make
+  check-make-ok
+  sudo make install
+  check-make-ok
+
+  echo
+  echo "WiringPi Devices Library"
+  cd ../devLib
+  sudo make uninstall
+  make
   check-make-ok
   sudo make install
   check-make-ok

devLib/Makefile

@@ -0,0 +1,130 @@
+# Makefile:
+#	wiringPi device - Wiring Compatable library for the Raspberry Pi
+#
+#	Copyright (c) 2012-2013 Gordon Henderson
+#################################################################################
+# This file is part of wiringPi:
+#	https://projects.drogon.net/raspberry-pi/wiringpi/
+#
+#    wiringPi is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Lesser General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    wiringPi is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU Lesser General Public License for more details.
+#
+#    You should have received a copy of the GNU Lesser General Public License
+#    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+#################################################################################
+
+DYN_VERS_MAJ=2
+DYN_VERS_MIN=0
+
+VERSION=$(DYN_VERS_MAJ).$(DYN_VERS_MIN)
+DESTDIR=/usr
+PREFIX=/local
+
+STATIC=libwiringPiDev.a
+DYNAMIC=libwiringPiDev.so.$(VERSION)
+
+#DEBUG	= -g -O0
+DEBUG	= -O2
+CC	= gcc
+INCLUDE	= -I.
+CFLAGS	= $(DEBUG) -Wformat=2 -Wall $(INCLUDE) -Winline -pipe -fPIC
+
+LIBS    =
+
+###############################################################################
+
+SRC	=	ds1302.c maxdetect.c  piNes.c		\
+		gertboard.c piFace.c			\
+		lcd128x64.c lcd.c
+
+OBJ	=	$(SRC:.c=.o)
+
+all:		$(DYNAMIC)
+
+static:		$(STATIC)
+
+$(STATIC):	$(OBJ)
+	@echo "[Link (Static)]"
+	@ar rcs $(STATIC) $(OBJ)
+	@ranlib $(STATIC)
+#	@size   $(STATIC)
+
+$(DYNAMIC):	$(OBJ)
+	@echo "[Link (Dynamic)]"
+	@$(CC) -shared -Wl,-soname,libwiringPiDev.so -o libwiringPiDev.so.$(VERSION) -lpthread $(OBJ)
+
+.c.o:
+	@echo [Compile] $<
+	@$(CC) -c $(CFLAGS) $< -o $@
+
+.PHONEY:	clean
+clean:
+	@echo "[Clean]"
+	@rm -f $(OBJ) $(OBJ_I2C) *~ core tags Makefile.bak libwiringPiDev.*
+
+.PHONEY:	tags
+tags:	$(SRC)
+	@echo [ctags]
+	@ctags $(SRC)
+
+
+.PHONEY:	install-headers
+install-headers:
+	@echo "[Install Headers]"
+	@install -m 0755 -d			$(DESTDIR)$(PREFIX)/include
+	@install -m 0644 ds1302.h		$(DESTDIR)$(PREFIX)/include
+	@install -m 0644 maxdetect.h		$(DESTDIR)$(PREFIX)/include
+	@install -m 0644 piNes.h		$(DESTDIR)$(PREFIX)/include
+	@install -m 0644 gertboard.h		$(DESTDIR)$(PREFIX)/include
+	@install -m 0644 piFace.h		$(DESTDIR)$(PREFIX)/include
+	@install -m 0644 lcd128x64.h		$(DESTDIR)$(PREFIX)/include
+	@install -m 0644 lcd.h			$(DESTDIR)$(PREFIX)/include
+
+.PHONEY:	install
+install:	$(DYNAMIC) install-headers
+	@echo "[Install Dynamic Lib]"
+	@install -m 0755 -d						$(DESTDIR)$(PREFIX)/lib
+	@install -m 0755 libwiringPiDev.so.$(VERSION)			$(DESTDIR)$(PREFIX)/lib/libwiringPiDev.so.$(VERSION)
+	@ln -sf $(DESTDIR)$(PREFIX)/lib/libwiringPiDev.so.$(VERSION)	$(DESTDIR)/lib/libwiringPiDev.so
+	@ldconfig
+
+.PHONEY:	install-static
+install-static:	$(STATIC) install-headers
+	@echo "[Install Static Lib]"
+	@install -m 0755 -d			$(DESTDIR)$(PREFIX)/lib
+	@install -m 0755 libwiringPiDev.a	$(DESTDIR)$(PREFIX)/lib
+
+.PHONEY:	uninstall
+uninstall:
+	@echo "[UnInstall]"
+	@rm -f $(DESTDIR)$(PREFIX)/include/ds1302.h
+	@rm -f $(DESTDIR)$(PREFIX)/include/maxdetect.h
+	@rm -f $(DESTDIR)$(PREFIX)/include/piNes.h
+	@rm -f $(DESTDIR)$(PREFIX)/include/gertboard.h
+	@rm -f $(DESTDIR)$(PREFIX)/include/piFace.h
+	@rm -f $(DESTDIR)$(PREFIX)/include/lcd128x64.h
+	@rm -f $(DESTDIR)$(PREFIX)/include/lcd.h
+	@rm -f $(DESTDIR)$(PREFIX)/lib/libwiringPiDev.*
+	@ldconfig
+
+
+.PHONEY:	depend
+depend:
+	makedepend -Y $(SRC)
+
+# DO NOT DELETE
+
+ds1302.o: ds1302.h
+maxdetect.o: maxdetect.h
+piNes.o: piNes.h
+gertboard.o: gertboard.h
+piFace.o: piFace.h
+lcd128x64.o: font.h lcd128x64.h
+lcd.o: lcd.h

devLib/ds1302.c

@@ -0,0 +1,240 @@
+/*
+ * ds1302.c:
+ *	Real Time clock
+ *
+ * Copyright (c) 2013 Gordon Henderson.
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdarg.h>
+
+#include <wiringPi.h>
+
+#include "ds1302.h"
+
+// Register defines
+
+#define	RTC_SECS	 0
+#define	RTC_MINS	 1
+#define	RTC_HOURS	 2
+#define	RTC_DATE	 3
+#define	RTC_MONTH	 4
+#define	RTC_DAY		 5
+#define	RTC_YEAR	 6
+#define	RTC_WP		 7
+#define	RTC_TC		 8
+#define	RTC_BM		31
+
+
+// Locals
+
+static int dPin, cPin, sPin ;
+
+/*
+ * dsShiftIn:
+ *	Shift a number in from the chip, LSB first. Note that the data is
+ *	sampled on the trailing edge of the last clock, so it's valid immediately.
+ *********************************************************************************
+ */
+
+static unsigned int dsShiftIn (void)
+{
+  uint8_t value = 0 ;
+  int i ;
+
+  pinMode (dPin, INPUT) ;	delayMicroseconds (1) ;
+
+  for (i = 0 ; i < 8 ; ++i)
+  {
+    value |= (digitalRead (dPin) << i) ;
+    digitalWrite (cPin, HIGH) ; delayMicroseconds (1) ;
+    digitalWrite (cPin, LOW) ;	delayMicroseconds (1) ;
+  }
+
+  return value;
+}
+
+
+/*
+ * dsShiftOut:
+ *	A normal LSB-first shift-out, just slowed down a bit - the Pi is
+ *	a bit faster than the chip can handle.
+ *********************************************************************************
+ */
+
+static void dsShiftOut (unsigned int data)
+{
+  int i ;
+
+  pinMode (dPin, OUTPUT) ;
+
+  for (i = 0 ; i < 8 ; ++i)
+  {
+    digitalWrite (dPin, data & (1 << i)) ;	delayMicroseconds (1) ;
+    digitalWrite (cPin, HIGH) ;			delayMicroseconds (1) ;
+    digitalWrite (cPin, LOW) ;			delayMicroseconds (1) ;
+  }
+}
+
+
+/*
+ * ds1302regRead: ds1302regWrite:
+ *	Read/Write a value to an RTC Register or RAM location on the chip
+ *********************************************************************************
+ */
+
+static unsigned int ds1302regRead (const int reg)
+{
+  unsigned int data ;
+
+  digitalWrite (sPin, HIGH) ; delayMicroseconds (1) ;
+    dsShiftOut (reg) ;
+    data = dsShiftIn () ;
+  digitalWrite (sPin, LOW)  ; delayMicroseconds (1) ;
+
+  return data ;
+}
+
+static void ds1302regWrite (const int reg, const unsigned int data)
+{
+  digitalWrite (sPin, HIGH) ; delayMicroseconds (1) ;
+    dsShiftOut (reg) ;
+    dsShiftOut (data) ;
+  digitalWrite (sPin, LOW)  ; delayMicroseconds (1) ;
+}
+
+
+/*
+ * ds1302rtcWrite: ds1302rtcRead:
+ *	Writes/Reads the data to/from the RTC register
+ *********************************************************************************
+ */
+
+unsigned int ds1302rtcRead (const int reg)
+{
+  return ds1302regRead (0x81 | ((reg & 0x1F) << 1)) ;
+}
+
+void ds1302rtcWrite (int reg, unsigned int data)
+{
+  ds1302regWrite (0x80 | ((reg & 0x1F) << 1), data) ;
+}
+
+
+/*
+ * ds1302ramWrite: ds1302ramRead:
+ *	Writes/Reads the data to/from the RTC register
+ *********************************************************************************
+ */
+
+unsigned int ds1302ramRead (const int addr)
+{
+  return ds1302regRead (0xC1 | ((addr & 0x1F) << 1)) ;
+}
+
+void ds1302ramWrite (const int addr, const unsigned int data)
+{
+  ds1302regWrite ( 0xC0 | ((addr & 0x1F) << 1), data) ;
+}
+
+/*
+ * ds1302clockRead:
+ *	Read all 8 bytes of the clock in a single operation
+ *********************************************************************************
+ */
+
+void ds1302clockRead (int clockData [8])
+{
+  int i ;
+  unsigned int regVal = 0x81 | ((RTC_BM & 0x1F) << 1) ;
+
+  digitalWrite (sPin, HIGH) ; delayMicroseconds (1) ;
+
+  dsShiftOut (regVal) ;
+  for (i = 0 ; i < 8 ; ++i)
+    clockData [i] = dsShiftIn () ;
+
+  digitalWrite (sPin, LOW) ;  delayMicroseconds (1) ;
+}
+
+
+/*
+ * ds1302clockWrite:
+ *	Write all 8 bytes of the clock in a single operation
+ *********************************************************************************
+ */
+
+void ds1302clockWrite (const int clockData [8])
+{
+  int i ;
+  unsigned int regVal = 0x80 | ((RTC_BM & 0x1F) << 1) ;
+
+  digitalWrite (sPin, HIGH) ; delayMicroseconds (1) ;
+
+  dsShiftOut (regVal) ;
+  for (i = 0 ; i < 8 ; ++i)
+    dsShiftOut (clockData [i]) ;
+
+  digitalWrite (sPin, LOW) ;  delayMicroseconds (1) ;
+}
+
+
+/*
+ * ds1302trickleCharge:
+ *	Set the bits on the trickle charger.
+ *	Probably best left alone...
+ *********************************************************************************
+ */
+
+void ds1302trickleCharge (const int diodes, const int resistors)
+{
+  if (diodes + resistors == 0)
+    ds1302rtcWrite (RTC_TC, 0x5C) ;	// Disabled
+  else
+    ds1302rtcWrite (RTC_TC, 0xA0 | ((diodes & 3) << 2) | (resistors & 3)) ;
+}
+
+
+
+
+/*
+ * ds1302setup:
+ *	Initialise the chip & remember the pins we're using
+ *********************************************************************************
+ */
+
+void ds1302setup (const int clockPin, const int dataPin, const int csPin)
+{
+  dPin = dataPin ;
+  cPin = clockPin ;
+  sPin = csPin ;
+
+  digitalWrite (dPin, LOW) ;
+  digitalWrite (cPin, LOW) ;
+  digitalWrite (sPin, LOW) ;
+
+  pinMode (dPin, OUTPUT) ;
+  pinMode (cPin, OUTPUT) ;
+  pinMode (sPin, OUTPUT) ;
+
+  ds1302rtcWrite (RTC_WP, 0) ;	// Remove write-protect
+}

wiringPi/lcd.h → devLib/ds1302.h

@@ -1,10 +1,8 @@
 /*
- * lcd.h:
- *	Text-based LCD driver.
- *	This is designed to drive the parallel interface LCD drivers
- *	based in the Hitachi HD44780U controller and compatables.
+ * ds1302.h:
+ *	Real Time clock
  *
- * Copyright (c) 2012 Gordon Henderson.
+ * Copyright (c) 2013 Gordon Henderson.
  ***********************************************************************
  * This file is part of wiringPi:
  *	https://projects.drogon.net/raspberry-pi/wiringpi/
@@ -24,22 +22,22 @@
  ***********************************************************************
  */
 
-#define	MAX_LCDS	8
-
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-extern void lcdHome        (int fd) ;
-extern void lcdClear       (int fd) ;
-extern void lcdSendCommand (int fd, uint8_t command) ;
-extern void lcdPosition    (int fd, int x, int y) ;
-extern void lcdPutchar     (int fd, uint8_t data) ;
-extern void lcdPuts        (int fd, char *string) ;
-extern void lcdPrintf      (int fd, char *message, ...) ;
+extern unsigned int ds1302rtcRead       (const int reg) ;
+extern void         ds1302rtcWrite      (const int reg, const unsigned int data) ;
+
+extern unsigned int ds1302ramRead       (const int addr) ;
+extern void         ds1302ramWrite      (const int addr, const unsigned int data) ;
+
+extern void         ds1302clockRead     (int clockData [8]) ;
+extern void         ds1302clockWrite    (const int clockData [8]) ;
+
+extern void         ds1302trickleCharge (const int diodes, const int resistors) ;
 
-extern int  lcdInit (int rows, int cols, int bits, int rs, int strb,
-	int d0, int d1, int d2, int d3, int d4, int d5, int d6, int d7) ;
+extern void         ds1302setup         (const int clockPin, const int dataPin, const int csPin) ;
 
 #ifdef __cplusplus
 }

wiringPi/gertboard.c → devLib/gertboard.c

@@ -38,16 +38,17 @@
 #include <sys/ioctl.h>
 #include <linux/spi/spidev.h>
 
-#include "wiringPiSPI.h"
+#include <wiringPi.h>
+#include <wiringPiSPI.h>
 
 #include "gertboard.h"
 
 // The A-D convertor won't run at more than 1MHz @ 3.3v
 
-#define	SPI_ADC_SPEED	 1000000
-#define	SPI_DAC_SPEED	 1000000
-#define	SPI_A2D		0
-#define	SPI_D2A		1
+#define	SPI_ADC_SPEED	1000000
+#define	SPI_DAC_SPEED	1000000
+#define	SPI_A2D		      0
+#define	SPI_D2A		      1
 
 
 /*
@@ -57,7 +58,7 @@
  *********************************************************************************
  */
 
-void gertboardAnalogWrite (int chan, int value)
+void gertboardAnalogWrite (const int chan, const int value)
 {
   uint8_t spiData [2] ;
   uint8_t chanBits, dataBits ;
@@ -84,7 +85,7 @@ void gertboardAnalogWrite (int chan, int value)
  *********************************************************************************
  */
 
-int gertboardAnalogRead (int chan)
+int gertboardAnalogRead (const int chan)
 {
   uint8_t spiData [2] ;
 
@@ -120,3 +121,44 @@ int gertboardSPISetup (void)
 
   return 0 ;
 }
+
+
+/*
+ * New wiringPi node extension methods.
+ *********************************************************************************
+ */
+
+static int myAnalogRead (struct wiringPiNodeStruct *node, const int chan)
+{
+  return gertboardAnalogRead (chan - node->pinBase) ;
+}
+
+static void myAnalogWrite (struct wiringPiNodeStruct *node, const int chan, const int value)
+{
+  gertboardAnalogWrite (chan - node->pinBase, value) ;
+}
+
+
+/*
+ * gertboardAnalogSetup:
+ *	Create a new wiringPi device node for the analog devices on the
+ *	Gertboard. We create one node with 2 pins - each pin being read
+ *	and write - although the operations actually go to different
+ *	hardware devices.
+ *********************************************************************************
+ */
+
+int gertboardAnalogSetup (const int pinBase)
+{
+  struct wiringPiNodeStruct *node ;
+  int    x ;
+
+  if (( x = gertboardSPISetup ()) != 0)
+    return  x;
+
+  node = wiringPiNewNode (pinBase, 2) ;
+  node->analogRead  = myAnalogRead ;
+  node->analogWrite = myAnalogWrite ;
+
+  return 0 ;
+}

wiringPi/gertboard.h → devLib/gertboard.h

@@ -30,10 +30,16 @@
 extern "C" {
 #endif
 
-extern void gertboardAnalogWrite (int chan, int value) ;
-extern int  gertboardAnalogRead  (int chan) ;
+// Old routines
+
+extern void gertboardAnalogWrite (const int chan, const int value) ;
+extern int  gertboardAnalogRead  (const int chan) ;
 extern int  gertboardSPISetup    (void) ;
 
+// New
+
+extern int  gertboardAnalogSetup (const int pinBase) ;
+
 #ifdef __cplusplus
 }
 #endif

wiringPi/lcd.c → devLib/lcd.c

@@ -26,29 +26,40 @@
 
 #include <stdio.h>
 #include <stdlib.h>
-#include <stdint.h>
 #include <stdarg.h>
 
-#include "wiringPi.h"
+#include <wiringPi.h>
+
 #include "lcd.h"
 
-// Commands
+#ifndef	TRUE
+#  define	TRUE	(1==1)
+#  define	FALSE	(1==2)
+#endif
+
+// HD44780U Commands
 
 #define	LCD_CLEAR	0x01
 #define	LCD_HOME	0x02
 #define	LCD_ENTRY	0x04
-#define	LCD_ON_OFF	0x08
+#define	LCD_CTRL	0x08
 #define	LCD_CDSHIFT	0x10
 #define	LCD_FUNC	0x20
 #define	LCD_CGRAM	0x40
 #define	LCD_DGRAM	0x80
 
-#define	LCD_ENTRY_SH	0x01
-#define	LCD_ENTRY_ID	0x02
+// Bits in the entry register
+
+#define	LCD_ENTRY_SH		0x01
+#define	LCD_ENTRY_ID		0x02
+
+// Bits in the control register
 
-#define	LCD_ON_OFF_B	0x01
-#define	LCD_ON_OFF_C	0x02
-#define	LCD_ON_OFF_D	0x04
+#define	LCD_BLINK_CTRL		0x01
+#define	LCD_CURSOR_CTRL		0x02
+#define	LCD_DISPLAY_CTRL	0x04
+
+// Bits in the function register
 
 #define	LCD_FUNC_F	0x04
 #define	LCD_FUNC_N	0x08
@@ -58,13 +69,20 @@
 
 struct lcdDataStruct
 {
-  uint8_t bits, rows, cols ;
-  uint8_t rsPin, strbPin ;
-  uint8_t dataPins [8] ;
+  int bits, rows, cols ;
+  int rsPin, strbPin ;
+  int dataPins [8] ;
+  int cx, cy ;
 } ;
 
 struct lcdDataStruct *lcds [MAX_LCDS] ;
 
+static int lcdControl ;
+
+// Row offsets
+
+static const int rowOff [4] = { 0x00, 0x40, 0x14, 0x54 } ;
+
 
 /*
  * strobe:
@@ -73,7 +91,7 @@ struct lcdDataStruct *lcds [MAX_LCDS] ;
  *********************************************************************************
  */
 
-static void strobe (struct lcdDataStruct *lcd)
+static void strobe (const struct lcdDataStruct *lcd)
 {
 
 // Note timing changes for new version of delayMicroseconds ()
@@ -89,13 +107,14 @@ static void strobe (struct lcdDataStruct *lcd)
  *********************************************************************************
  */
 
-static void sendDataCmd (struct lcdDataStruct *lcd, uint8_t data)
+static void sendDataCmd (const struct lcdDataStruct *lcd, unsigned char data)
 {
-  uint8_t i, d4 ;
+  register unsigned char myData = data ;
+  unsigned char          i, d4 ;
 
   if (lcd->bits == 4)
   {
-    d4 = (data >> 4) & 0x0F;
+    d4 = (myData >> 4) & 0x0F;
     for (i = 0 ; i < 4 ; ++i)
     {
       digitalWrite (lcd->dataPins [i], (d4 & 1)) ;
@@ -103,7 +122,7 @@ static void sendDataCmd (struct lcdDataStruct *lcd, uint8_t data)
     }
     strobe (lcd) ;
 
-    d4 = data & 0x0F ;
+    d4 = myData & 0x0F ;
     for (i = 0 ; i < 4 ; ++i)
     {
       digitalWrite (lcd->dataPins [i], (d4 & 1)) ;
@@ -114,8 +133,8 @@ static void sendDataCmd (struct lcdDataStruct *lcd, uint8_t data)
   {
     for (i = 0 ; i < 8 ; ++i)
     {
-      digitalWrite (lcd->dataPins [i], (data & 1)) ;
-      data >>= 1 ;
+      digitalWrite (lcd->dataPins [i], (myData & 1)) ;
+      myData >>= 1 ;
     }
   }
   strobe (lcd) ;
@@ -128,22 +147,24 @@ static void sendDataCmd (struct lcdDataStruct *lcd, uint8_t data)
  *********************************************************************************
  */
 
-static void putCommand (struct lcdDataStruct *lcd, uint8_t command)
+static void putCommand (const struct lcdDataStruct *lcd, unsigned char command)
 {
   digitalWrite (lcd->rsPin,   0) ;
   sendDataCmd  (lcd, command) ;
+  delay (2) ;
 }
 
-static void put4Command (struct lcdDataStruct *lcd, uint8_t command)
+static void put4Command (const struct lcdDataStruct *lcd, unsigned char command)
 {
-  uint8_t i ;
+  register unsigned char myCommand = command ;
+  register unsigned char i ;
 
   digitalWrite (lcd->rsPin,   0) ;
 
   for (i = 0 ; i < 4 ; ++i)
   {
-    digitalWrite (lcd->dataPins [i], (command & 1)) ;
-    command >>= 1 ;
+    digitalWrite (lcd->dataPins [i], (myCommand & 1)) ;
+    myCommand >>= 1 ;
   }
   strobe (lcd) ;
 }
@@ -151,7 +172,7 @@ static void put4Command (struct lcdDataStruct *lcd, uint8_t command)
 
 /*
  *********************************************************************************
- * User Code below here
+ * User Callable code below here
  *********************************************************************************
  */
 
@@ -161,16 +182,66 @@ static void put4Command (struct lcdDataStruct *lcd, uint8_t command)
  *********************************************************************************
  */
 
-void lcdHome (int fd)
+void lcdHome (const int fd)
 {
   struct lcdDataStruct *lcd = lcds [fd] ;
+
   putCommand (lcd, LCD_HOME) ;
+  lcd->cx = lcd->cy = 0 ;
+  delay (5) ;
 }
 
-void lcdClear (int fd)
+void lcdClear (const int fd)
 {
   struct lcdDataStruct *lcd = lcds [fd] ;
+
   putCommand (lcd, LCD_CLEAR) ;
+  putCommand (lcd, LCD_HOME) ;
+  lcd->cx = lcd->cy = 0 ;
+  delay (5) ;
+}
+
+
+/*
+ * lcdDisplay: lcdCursor: lcdCursorBlink:
+ *	Turn the display, cursor, cursor blinking on/off
+ *********************************************************************************
+ */
+
+void lcdDisplay (const int fd, int state)
+{
+  struct lcdDataStruct *lcd = lcds [fd] ;
+
+  if (state)
+    lcdControl |=  LCD_DISPLAY_CTRL ;
+  else
+    lcdControl &= ~LCD_DISPLAY_CTRL ;
+
+  putCommand (lcd, LCD_CTRL | lcdControl) ; 
+}
+
+void lcdCursor (const int fd, int state)
+{
+  struct lcdDataStruct *lcd = lcds [fd] ;
+
+  if (state)
+    lcdControl |=  LCD_CURSOR_CTRL ;
+  else
+    lcdControl &= ~LCD_CURSOR_CTRL ;
+
+  putCommand (lcd, LCD_CTRL | lcdControl) ; 
+}
+
+void lcdCursorBlink (const int fd, int state)
+{
+  struct lcdDataStruct *lcd = lcds [fd] ;
+
+  if (state)
+    lcdControl |=  LCD_BLINK_CTRL ;
+  else
+    lcdControl &= ~LCD_BLINK_CTRL ;
+
+  putCommand (lcd, LCD_CTRL | lcdControl) ; 
 }
 
 
@@ -180,40 +251,77 @@ void lcdClear (int fd)
  *********************************************************************************
  */
 
-void lcdSendCommand (int fd, uint8_t command)
+void lcdSendCommand (const int fd, unsigned char command)
 {
   struct lcdDataStruct *lcd = lcds [fd] ;
   putCommand (lcd, command) ;
 }
 
+
 /*
  * lcdPosition:
- *	Update the position of the cursor on the display
+ *	Update the position of the cursor on the display.
+ *	Ignore invalid locations.
  *********************************************************************************
  */
 
-
-void lcdPosition (int fd, int x, int y)
+void lcdPosition (const int fd, int x, int y)
 {
-  static uint8_t rowOff [4] = { 0x00, 0x40, 0x14, 0x54 } ;
   struct lcdDataStruct *lcd = lcds [fd] ;
 
+  if ((x > lcd->cols) || (x < 0))
+    return ;
+  if ((y > lcd->rows) || (y < 0))
+    return ;
+
   putCommand (lcd, x + (LCD_DGRAM | rowOff [y])) ;
+
+  lcd->cx = x ;
+  lcd->cy = y ;
+}
+
+
+/*
+ * lcdCharDef:
+ *	Defines a new character in the CGRAM
+ *********************************************************************************
+ */
+
+void lcdCharDef (const int fd, int index, unsigned char data [8])
+{
+  struct lcdDataStruct *lcd = lcds [fd] ;
+  int i ;
+
+  putCommand (lcd, LCD_CGRAM | ((index & 7) << 3)) ;
+
+  digitalWrite (lcd->rsPin, 1) ;
+  for (i = 0 ; i < 8 ; ++i)
+    sendDataCmd (lcd, data [i]) ;
 }
 
 
 /*
  * lcdPutchar:
- *	Send a data byte to be displayed on the display
+ *	Send a data byte to be displayed on the display. We implement a very
+ *	simple terminal here - with line wrapping, but no scrolling. Yet.
  *********************************************************************************
  */
 
-void lcdPutchar (int fd, uint8_t data)
+void lcdPutchar (const int fd, unsigned char data)
 {
   struct lcdDataStruct *lcd = lcds [fd] ;
 
   digitalWrite (lcd->rsPin, 1) ;
-  sendDataCmd (lcd, data) ;
+  sendDataCmd  (lcd, data) ;
+
+  if (++lcd->cx == lcd->cols)
+  {
+    lcd->cx = 0 ;
+    if (++lcd->cy == lcd->rows)
+      lcd->cy = 0 ;
+    
+    putCommand (lcd, lcd->cx + (LCD_DGRAM | rowOff [lcd->cy])) ;
+  }
 }
 
 
@@ -223,7 +331,7 @@ void lcdPutchar (int fd, uint8_t data)
  *********************************************************************************
  */
 
-void lcdPuts (int fd, char *string)
+void lcdPuts (const int fd, const char *string)
 {
   while (*string)
     lcdPutchar (fd, *string++) ;
@@ -236,7 +344,7 @@ void lcdPuts (int fd, char *string)
  *********************************************************************************
  */
 
-void lcdPrintf (int fd, char *message, ...)
+void lcdPrintf (const int fd, const char *message, ...)
 {
   va_list argp ;
   char buffer [1024] ;
@@ -256,12 +364,14 @@ void lcdPrintf (int fd, char *message, ...)
  *********************************************************************************
  */
 
-int lcdInit (int rows, int cols, int bits, int rs, int strb,
-	int d0, int d1, int d2, int d3, int d4, int d5, int d6, int d7)
+int lcdInit (const int rows, const int cols, const int bits,
+	const int rs, const int strb,
+	const int d0, const int d1, const int d2, const int d3, const int d4,
+	const int d5, const int d6, const int d7)
 {
   static int initialised = 0 ;
 
-  uint8_t func ;
+  unsigned char func ;
   int i ;
   int lcdFd = -1 ;
   struct lcdDataStruct *lcd ;
@@ -298,7 +408,7 @@ int lcdInit (int rows, int cols, int bits, int rs, int strb,
   if (lcdFd == -1)
     return -1 ;
 
-  lcd = malloc (sizeof (struct lcdDataStruct)) ;
+  lcd = (struct lcdDataStruct *)malloc (sizeof (struct lcdDataStruct)) ;
   if (lcd == NULL)
     return -1 ;
 
@@ -307,6 +417,8 @@ int lcdInit (int rows, int cols, int bits, int rs, int strb,
   lcd->bits    = 8 ;		// For now - we'll set it properly later.
   lcd->rows    = rows ;
   lcd->cols    = cols ;
+  lcd->cx      = 0 ;
+  lcd->cy      = 0 ;
 
   lcd->dataPins [0] = d0 ;
   lcd->dataPins [1] = d1 ;
@@ -371,10 +483,13 @@ int lcdInit (int rows, int cols, int bits, int rs, int strb,
 
 // Rest of the initialisation sequence
 
-  putCommand (lcd, LCD_ON_OFF  | LCD_ON_OFF_D) ;   delay (2) ;
-  putCommand (lcd, LCD_ENTRY   | LCD_ENTRY_ID) ;   delay (2) ;
-  putCommand (lcd, LCD_CDSHIFT | LCD_CDSHIFT_RL) ; delay (2) ;
-  putCommand (lcd, LCD_CLEAR) ;                    delay (5) ;
+  lcdDisplay     (lcdFd, TRUE) ;
+  lcdCursor      (lcdFd, FALSE) ;
+  lcdCursorBlink (lcdFd, FALSE) ;
+  lcdClear       (lcdFd) ;
+
+  putCommand (lcd, LCD_ENTRY   | LCD_ENTRY_ID) ;
+  putCommand (lcd, LCD_CDSHIFT | LCD_CDSHIFT_RL) ;
 
   return lcdFd ;
 }

devLib/lcd.h

@@ -0,0 +1,52 @@
+/*
+ * lcd.h:
+ *	Text-based LCD driver.
+ *	This is designed to drive the parallel interface LCD drivers
+ *	based in the Hitachi HD44780U controller and compatables.
+ *
+ * Copyright (c) 2012 Gordon Henderson.
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#define	MAX_LCDS	8
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern void lcdHome        (const int fd) ;
+extern void lcdClear       (const int fd) ;
+extern void lcdDisplay     (const int fd, int state) ;
+extern void lcdCursor      (const int fd, int state) ;
+extern void lcdCursorBlink (const int fd, int state) ;
+extern void lcdSendCommand (const int fd, unsigned char command) ;
+extern void lcdPosition    (const int fd, int x, int y) ;
+extern void lcdCharDef     (const int fd, int index, unsigned char data [8]) ;
+extern void lcdPutchar     (const int fd, unsigned char data) ;
+extern void lcdPuts        (const int fd, const char *string) ;
+extern void lcdPrintf      (const int fd, const char *message, ...) ;
+
+extern int  lcdInit (const int rows, const int cols, const int bits,
+	const int rs, const int strb,
+	const int d0, const int d1, const int d2, const int d3, const int d4,
+	const int d5, const int d6, const int d7) ;
+
+#ifdef __cplusplus
+}
+#endif

devLib/lcd128x64.c

@@ -0,0 +1,673 @@
+/*
+ * lcd128x64.c:
+ *	Graphics-based LCD driver.
+ *	This is designed to drive the parallel interface LCD drivers
+ *	based on the generic 12864H chips
+ *
+ *	There are many variations on these chips, however they all mostly
+ *	seem to be similar.
+ *	This implementation has the Pins from the Pi hard-wired into it,
+ *	in particular wiringPi pins 0-7 so that we can use
+ *	digitalWriteByete() to speed things up somewhat.
+ *
+ * Copyright (c) 2013 Gordon Henderson.
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <wiringPi.h>
+
+#include "font.h"
+#include "lcd128x64.h"
+
+// Size
+
+#define	LCD_WIDTH	128
+#define	LCD_HEIGHT	 64
+
+// Hardware Pins
+//	Note pins 0-7 are the 8-bit data port
+
+#define	CS1		10
+#define	CS2		11
+#define	STROBE		12
+#define	RS		13
+
+// Software copy of the framebuffer
+//	it's 8-bit deep although the display itself is only 1-bit deep.
+
+static unsigned char frameBuffer [LCD_WIDTH * LCD_HEIGHT] ;
+
+static int maxX,    maxY ;
+static int lastX,   lastY ;
+static int xOrigin, yOrigin ;
+static int lcdOrientation = 0 ;
+
+/*
+ * strobe:
+ *	Toggle the strobe (Really the "E") pin to the device.
+ *	According to the docs, data is latched on the falling edge.
+ *********************************************************************************
+ */
+
+static void strobe (void)
+{
+  digitalWrite (STROBE, 1) ; delayMicroseconds (1) ;
+  digitalWrite (STROBE, 0) ; delayMicroseconds (5) ;
+}
+
+
+/*
+ * sentData:
+ *	Send an data or command byte to the display.
+ *********************************************************************************
+ */
+
+static void sendData (const int data, const int chip)
+{
+  digitalWrite     (chip, 0) ;
+  digitalWriteByte (data) ;
+  strobe           () ;
+  digitalWrite     (chip, 1) ;
+}
+
+
+/*
+ * sendCommand:
+ *	Send a command byte to the display
+ *********************************************************************************
+ */
+
+static void sendCommand (const int command, const int chip)
+{
+  digitalWrite (RS, 0) ;
+  sendData     (command, chip) ;
+  digitalWrite (RS, 1) ;
+}
+
+
+/*
+ * setCol: SetLine:
+ *	Set the column and line addresses
+ *********************************************************************************
+ */
+
+static void setCol  (int col, const int chip)
+  { sendCommand (0x40 | (col  & 0x3F), chip) ; }
+
+static void setLine (int line, const int chip)
+  { sendCommand (0xB8 | (line & 0x07), chip) ; }
+
+
+/*
+ * lcd128x64update:
+ *	Copy our software version to the real display
+ *********************************************************************************
+ */
+
+void lcd128x64update (void)
+{
+  int line, x, y, fbLoc ;
+  unsigned char byte ;
+
+// Left side 
+
+  for (line = 0 ; line < 8 ; ++line)
+  {
+    setCol  (0,    CS1) ;
+    setLine (line, CS1) ;
+
+    for (x = 63 ; x >= 0 ; --x)
+    {
+      byte = 0 ;
+      for (y = 0 ; y < 8 ; ++y)
+      {
+	fbLoc = x + (((7 - line) * 8) + (7 - y)) * LCD_WIDTH ;
+	if (frameBuffer [fbLoc] != 0)
+	  byte |= (1 << y) ;
+      }
+      sendData (byte, CS1) ;
+    }
+  }
+
+// Right side 
+
+  for (line = 0 ; line < 8 ; ++line)
+  {
+    setCol  (0,    CS2) ;
+    setLine (line, CS2) ;
+
+    for (x = 127 ; x >= 64 ; --x)
+    {
+      byte = 0 ;
+      for (y = 0 ; y < 8 ; ++y)
+      {
+	fbLoc = x + (((7 - line) * 8) + (7 - y)) * LCD_WIDTH ;
+	if (frameBuffer [fbLoc] != 0)
+	  byte |= (1 << y) ;
+      }
+      sendData (byte, CS2) ;
+    }
+  }
+}
+
+
+/*
+ * lcd128x64setOrigin:
+ *	Set the display offset origin
+ *********************************************************************************
+ */
+
+void lcd128x64setOrigin (int x, int y)
+{
+  xOrigin = x ;
+  yOrigin = y ;
+}
+
+
+/*
+ * lcd128x64setOrientation:
+ *	Set the display orientation:
+ *	0: Normal, the display is portrait mode, 0,0 is top left
+ *	1: Landscape
+ *	2: Portrait, flipped
+ *	3: Landscape, flipped
+ *********************************************************************************
+ */
+
+void lcd128x64setOrientation (int orientation)
+{
+  lcdOrientation = orientation & 3 ;
+
+  lcd128x64setOrigin (0,0) ;
+
+  switch (lcdOrientation)
+  {
+    case 0:
+      maxX = LCD_WIDTH ;
+      maxY = LCD_HEIGHT ;
+      break ;
+
+    case 1:
+      maxX = LCD_HEIGHT ;
+      maxY = LCD_WIDTH ;
+      break ;
+
+    case 2:
+      maxX = LCD_WIDTH ;
+      maxY = LCD_HEIGHT ;
+      break ;
+
+    case 3:
+      maxX = LCD_HEIGHT ;
+      maxY = LCD_WIDTH ;
+      break ;
+  }
+}
+
+
+/*
+ * lcd128x64orientCoordinates:
+ *	Adjust the coordinates given to the display orientation
+ *********************************************************************************
+ */
+
+void lcd128x64orientCoordinates (int *x, int *y)
+{
+  register int tmp ;
+
+  *x += xOrigin ;
+  *y += yOrigin ;
+  *y  = maxY - *y - 1 ;
+
+  switch (lcdOrientation)
+  {
+    case 0:
+      break;
+
+    case 1:
+      tmp = maxY - *y - 1 ;
+      *y = *x ;
+      *x = tmp ;
+      break;
+
+    case 2:
+      *x = maxX - *x - 1 ;
+      *y = maxY - *y - 1 ;
+      break;
+
+    case 3:
+      *x = maxX - *x - 1 ;
+      tmp = *y ;
+      *y = *x ;
+      *x = tmp ;
+      break ;
+  }
+}
+
+
+/*
+ * lcd128x64getScreenSize:
+ *	Return the max X & Y screen sizes. Needs to be called again, if you 
+ *	change screen orientation.
+ *********************************************************************************
+ */
+
+void lcd128x64getScreenSize (int *x, int *y)
+{
+  *x = maxX ;
+  *y = maxY ;
+}
+
+
+/*
+ *********************************************************************************
+ * Standard Graphical Functions
+ *********************************************************************************
+ */
+
+
+/*
+ * lcd128x64point:
+ *	Plot a pixel.
+ *********************************************************************************
+ */
+
+void lcd128x64point (int x, int y, int colour)
+{
+  lastX = x ;
+  lastY = y ;
+
+  lcd128x64orientCoordinates (&x, &y) ;
+
+  if ((x < 0) || (x >= LCD_WIDTH) || (y < 0) || (y >= LCD_HEIGHT))
+    return ;
+
+  frameBuffer [x + y * LCD_WIDTH] = colour ;
+}
+
+
+/*
+ * lcd128x64line: lcd128x64lineTo:
+ *	Classic Bressenham Line code
+ *********************************************************************************
+ */
+
+void lcd128x64line (int x0, int y0, int x1, int y1, int colour)
+{
+  int dx, dy ;
+  int sx, sy ;
+  int err, e2 ;
+
+  lastX = x1 ;
+  lastY = y1 ;
+
+  dx = abs (x1 - x0) ;
+  dy = abs (y1 - y0) ;
+
+  sx = (x0 < x1) ? 1 : -1 ;
+  sy = (y0 < y1) ? 1 : -1 ;
+
+  err = dx - dy ;
+ 
+  for (;;)
+  {
+    lcd128x64point (x0, y0, colour) ;
+
+    if ((x0 == x1) && (y0 == y1))
+      break ;
+
+    e2 = 2 * err ;
+
+    if (e2 > -dy)
+    {
+      err -= dy ;
+      x0  += sx ;
+    }
+
+    if (e2 < dx)
+    {
+      err += dx ;
+      y0  += sy ;
+    }
+  }
+
+}
+
+void lcd128x64lineTo (int x, int y, int colour)
+{
+  lcd128x64line (lastX, lastY, x, y, colour) ;
+}
+
+
+/*
+ * lcd128x64rectangle:
+ *	A rectangle is a spoilt days fishing
+ *********************************************************************************
+ */
+
+void lcd128x64rectangle (int x1, int y1, int x2, int y2, int colour, int filled)
+{
+  register int x ;
+
+  if (filled)
+  {
+    /**/ if (x1 == x2)
+      lcd128x64line (x1, y1, x2, y2, colour) ;
+    else if (x1 < x2)
+      for (x = x1 ; x <= x2 ; ++x)
+	lcd128x64line (x, y1, x, y2, colour) ;
+    else
+      for (x = x2 ; x <= x1 ; ++x)
+	lcd128x64line (x, y1, x, y2, colour) ;
+  }
+  else
+  {
+    lcd128x64line   (x1, y1, x2, y1, colour) ;
+    lcd128x64lineTo (x2, y2, colour) ;
+    lcd128x64lineTo (x1, y2, colour) ;
+    lcd128x64lineTo (x1, y1, colour) ;
+  }
+}
+
+
+/*
+ * lcd128x64circle:
+ *      This is the midpoint circle algorithm.
+ *********************************************************************************
+ */
+
+void lcd128x64circle (int x, int y, int r, int colour, int filled)
+{
+  int ddF_x = 1 ;
+  int ddF_y = -2 * r ;
+
+  int f = 1 - r ;
+  int x1 = 0 ;
+  int y1 = r ;
+
+  if (filled)
+  {
+    lcd128x64line (x, y + r, x, y - r, colour) ;
+    lcd128x64line (x + r, y, x - r, y, colour) ;
+  }
+  else
+  {
+    lcd128x64point (x, y + r, colour) ;
+    lcd128x64point (x, y - r, colour) ;
+    lcd128x64point (x + r, y, colour) ;
+    lcd128x64point (x - r, y, colour) ;
+  }
+
+  while (x1 < y1)
+  {
+    if (f >= 0)
+    {
+      y1-- ;
+      ddF_y += 2 ;
+      f += ddF_y ;
+    }
+    x1++ ;
+    ddF_x += 2 ;
+    f += ddF_x ;
+    if (filled)
+    {
+      lcd128x64line (x + x1, y + y1, x - x1, y + y1, colour) ;
+      lcd128x64line (x + x1, y - y1, x - x1, y - y1, colour) ;
+      lcd128x64line (x + y1, y + x1, x - y1, y + x1, colour) ;
+      lcd128x64line (x + y1, y - x1, x - y1, y - x1, colour) ;
+    }
+    else
+    {
+      lcd128x64point (x + x1, y + y1, colour) ; lcd128x64point (x - x1, y + y1, colour) ;
+      lcd128x64point (x + x1, y - y1, colour) ; lcd128x64point (x - x1, y - y1, colour) ;
+      lcd128x64point (x + y1, y + x1, colour) ; lcd128x64point (x - y1, y + x1, colour) ;
+      lcd128x64point (x + y1, y - x1, colour) ; lcd128x64point (x - y1, y - x1, colour) ;
+    }
+  }
+}
+
+
+/*
+ * lcd128x64ellipse:
+ *	Fast ellipse drawing algorithm by 
+ *      John Kennedy
+ *	Mathematics Department
+ *	Santa Monica College
+ *	1900 Pico Blvd.
+ *	Santa Monica, CA 90405
+ *	jrkennedy6@gmail.com
+ *	-Confirned in email this algorithm is in the public domain -GH-
+ *********************************************************************************
+ */
+
+static void plot4ellipsePoints (int cx, int cy, int x, int y, int colour, int filled)
+{
+  if (filled)
+  {
+    lcd128x64line (cx + x, cy + y, cx - x, cy + y, colour) ;
+    lcd128x64line (cx - x, cy - y, cx + x, cy - y, colour) ;
+  }
+  else
+  {
+    lcd128x64point (cx + x, cy + y, colour) ;
+    lcd128x64point (cx - x, cy + y, colour) ;
+    lcd128x64point (cx - x, cy - y, colour) ;
+    lcd128x64point (cx + x, cy - y, colour) ;
+  }
+}
+
+void lcd128x64ellipse (int cx, int cy, int xRadius, int yRadius, int colour, int filled)
+{
+  int x, y ;
+  int xChange, yChange, ellipseError ;
+  int twoAsquare, twoBsquare ;
+  int stoppingX, stoppingY ;
+
+  twoAsquare = 2 * xRadius * xRadius ;
+  twoBsquare = 2 * yRadius * yRadius ;
+
+  x = xRadius ;
+  y = 0 ;
+
+  xChange = yRadius * yRadius * (1 - 2 * xRadius) ;
+  yChange = xRadius * xRadius ;
+
+  ellipseError = 0 ;
+  stoppingX    = twoBsquare * xRadius ;
+  stoppingY    = 0 ;
+
+  while (stoppingX >= stoppingY)	// 1st set of points
+  {
+    plot4ellipsePoints (cx, cy, x, y, colour, filled) ;
+    ++y ;
+    stoppingY    += twoAsquare ;
+    ellipseError += yChange ;
+    yChange      += twoAsquare ;
+
+    if ((2 * ellipseError + xChange) > 0 )
+    {
+      --x ;
+      stoppingX    -= twoBsquare ;
+      ellipseError += xChange ;
+      xChange      += twoBsquare ;
+    }
+  }
+
+  x = 0 ;
+  y = yRadius ;
+
+  xChange = yRadius * yRadius ;
+  yChange = xRadius * xRadius * (1 - 2 * yRadius) ;
+
+  ellipseError = 0 ;
+  stoppingX    = 0 ;
+  stoppingY    = twoAsquare * yRadius ;
+
+  while (stoppingX <= stoppingY)	//2nd set of points
+  {
+    plot4ellipsePoints (cx, cy, x, y, colour, filled) ;
+    ++x ;
+    stoppingX    += twoBsquare ;
+    ellipseError += xChange ;
+    xChange      += twoBsquare ;
+
+    if ((2 * ellipseError + yChange) > 0 )
+    {
+      --y ;
+      stoppingY -= twoAsquare ;
+      ellipseError += yChange ;
+      yChange += twoAsquare ;
+    }
+  }
+}
+
+
+/*
+ * lcd128x64putchar:
+ *	Print a single character to the screen
+ *********************************************************************************
+ */
+
+void lcd128x64putchar (int x, int y, int c, int bgCol, int fgCol)
+{
+  int y1, y2 ;
+
+  unsigned char line ;
+  unsigned char *fontPtr ;
+
+// Can't print if we're offscreen
+
+//if ((x < 0) || (x >= (maxX - fontWidth)) || (y < 0) || (y >= (maxY - fontHeight)))
+//  return ;
+
+  fontPtr = font + c * fontHeight ;
+
+  for (y1 = fontHeight - 1 ; y1 >= 0 ; --y1)
+  {
+    y2 = y + y1 ;
+    line = *fontPtr++ ;
+    lcd128x64point (x + 0, y2, (line & 0x80) == 0 ? bgCol : fgCol) ;
+    lcd128x64point (x + 1, y2, (line & 0x40) == 0 ? bgCol : fgCol) ;
+    lcd128x64point (x + 2, y2, (line & 0x20) == 0 ? bgCol : fgCol) ;
+    lcd128x64point (x + 3, y2, (line & 0x10) == 0 ? bgCol : fgCol) ;
+    lcd128x64point (x + 4, y2, (line & 0x08) == 0 ? bgCol : fgCol) ;
+    lcd128x64point (x + 5, y2, (line & 0x04) == 0 ? bgCol : fgCol) ;
+    lcd128x64point (x + 6, y2, (line & 0x02) == 0 ? bgCol : fgCol) ;
+    lcd128x64point (x + 7, y2, (line & 0x01) == 0 ? bgCol : fgCol) ;
+  }
+}
+
+
+/*
+ * lcd128x64puts:
+ *	Send a string to the display. Obeys \n and \r formatting
+ *********************************************************************************
+ */
+
+void lcd128x64puts (int x, int y, const char *str, int bgCol, int fgCol)
+{
+  int c, mx, my ;
+
+  mx = x ; my = y ;
+
+  while (*str)
+  {
+    c = *str++ ;
+
+    if (c == '\r')
+    {
+      mx = x ;
+      continue ;
+    }
+
+    if (c == '\n')
+    {
+      mx  = x ;
+      my -= fontHeight ;
+      continue ;
+    }
+
+    lcd128x64putchar (mx, my, c, bgCol, fgCol) ;
+
+    mx += fontWidth ;
+    if (mx >= (maxX - fontWidth))
+    {
+      mx  = 0 ;
+      my -= fontHeight ;
+    }
+  }
+}
+
+
+/*
+ * lcd128x64clear:
+ *	Clear the display to the given colour.
+ *********************************************************************************
+ */
+
+void lcd128x64clear (int colour)
+{
+  register int i ;
+  register unsigned char *ptr = frameBuffer ;
+
+  for (i = 0 ; i < (maxX * maxY) ; ++i)
+    *ptr++ = colour ;
+}
+
+
+
+
+/*
+ * lcd128x64setup:
+ *	Initialise the display and GPIO.
+ *********************************************************************************
+ */
+
+int lcd128x64setup (void)
+{
+  int i ;
+
+  for (i = 0 ; i < 8 ; ++i)
+    pinMode (i, OUTPUT) ;
+
+  digitalWrite (CS1,    1) ;
+  digitalWrite (CS2,    1) ;
+  digitalWrite (STROBE, 0) ;
+  digitalWrite (RS,     1) ;
+
+  pinMode (CS1,    OUTPUT) ;
+  pinMode (CS2,    OUTPUT) ;
+  pinMode (STROBE, OUTPUT) ;
+  pinMode (RS,     OUTPUT) ;
+
+  sendCommand (0x3F, CS1) ;	// Display ON
+  sendCommand (0xC0, CS1) ;	// Set display start line to 0
+
+  sendCommand (0x3F, CS2) ;	// Display ON
+  sendCommand (0xC0, CS2) ;	// Set display start line to 0
+
+  lcd128x64clear          (0) ;
+  lcd128x64setOrientation (0) ;
+  lcd128x64update         () ;
+
+  return 0 ;
+}

devLib/lcd128x64.h

@@ -0,0 +1,39 @@
+/*
+ * lcd128x64.h:
+ *
+ * Copyright (c) 2013 Gordon Henderson.
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+extern void lcd128x64setOrigin         (int x, int y) ;
+extern void lcd128x64setOrientation    (int orientation) ;
+extern void lcd128x64orientCoordinates (int *x, int *y) ;
+extern void lcd128x64getScreenSize     (int *x, int *y) ;
+extern void lcd128x64point             (int  x, int  y, int colour) ;
+extern void lcd128x64line              (int x0, int y0, int x1, int y1, int colour) ;
+extern void lcd128x64lineTo            (int  x, int  y, int colour) ;
+extern void lcd128x64rectangle         (int x1, int y1, int x2, int y2, int colour, int filled) ;
+extern void lcd128x64circle            (int  x, int  y, int  r, int colour, int filled) ;
+extern void lcd128x64ellipse           (int cx, int cy, int xRadius, int yRadius, int colour, int filled) ;
+extern void lcd128x64putchar           (int  x, int  y, int c, int bgCol, int fgCol) ;
+extern void lcd128x64puts              (int  x, int  y, const char *str, int bgCol, int fgCol) ;
+extern void lcd128x64update            (void) ;
+extern void lcd128x64clear             (int colour) ;
+
+extern int  lcd128x64setup             (void) ;

devLib/maxdetect.c

@@ -0,0 +1,165 @@
+/*
+ * maxdetect.c:
+ *	Driver for the MaxDetect series sensors
+ *
+ * Copyright (c) 2013 Gordon Henderson.
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+//#include <stdio.h>
+//#include <stdlib.h>
+//#include <unistd.h>
+
+#include <wiringPi.h>
+
+#include "maxdetect.h"
+
+#ifndef	TRUE
+#  define	TRUE	(1==1)
+#  define	FALSE	(1==2)
+#endif
+
+
+/*
+ * maxDetectLowHighWait:
+ *	Wait for a transition from high to low on the bus
+ *********************************************************************************
+ */
+
+static void maxDetectLowHighWait (const int pin)
+{
+  unsigned int timeOut = millis () + 2000 ;
+
+  while (digitalRead (pin) == HIGH)
+    if (millis () > timeOut)
+      return ;
+
+  while (digitalRead (pin) == LOW)
+    if (millis () > timeOut)
+      return ;
+}
+
+
+/*
+ * maxDetectClockByte:
+ *	Read in a single byte from the MaxDetect bus
+ *********************************************************************************
+ */
+
+static unsigned int maxDetectClockByte (const int pin)
+{
+  unsigned int byte = 0 ;
+  int bit ;
+
+  for (bit = 0 ; bit < 8 ; ++bit)
+  {
+    maxDetectLowHighWait (pin) ;
+
+// bit starting now - we need to time it.
+
+    delayMicroseconds (30) ;
+    byte <<= 1 ;
+    if (digitalRead (pin) == HIGH)	// It's a 1
+      byte |= 1 ;
+  }
+
+  return byte ;
+}
+
+
+/*
+ * maxDetectRead:
+ *	Read in and return the 4 data bytes from the MaxDetect sensor.
+ *	Return TRUE/FALSE depending on the checksum validity
+ *********************************************************************************
+ */
+
+int maxDetectRead (const int pin, unsigned char buffer [4])
+{
+  int i ;
+  unsigned int checksum ;
+  unsigned char localBuf [5] ;
+
+// Wake up the RHT03 by pulling the data line low, then high
+//	Low for 10mS, high for 40uS.
+
+  pinMode      (pin, OUTPUT) ;
+  digitalWrite (pin, 0) ; delay             (10) ;
+  digitalWrite (pin, 1) ; delayMicroseconds (40) ;
+  pinMode      (pin, INPUT) ;
+
+// Now wait for sensor to pull pin low
+
+  maxDetectLowHighWait (pin) ;
+
+// and read in 5 bytes (40 bits)
+
+  for (i = 0 ; i < 5 ; ++i)
+    localBuf [i] = maxDetectClockByte (pin) ;
+
+  checksum = 0 ;
+  for (i = 0 ; i < 4 ; ++i)
+  {
+    buffer [i] = localBuf [i] ;
+    checksum += localBuf [i] ;
+  }
+  checksum &= 0xFF ;
+
+  return checksum == localBuf [4] ;
+}
+
+
+/*
+ * readRHT03:
+ *	Read the Temperature & Humidity from an RHT03 sensor
+ *********************************************************************************
+ */
+
+int readRHT03 (const int pin, int *temp, int *rh)
+{
+  static unsigned int nextTime   = 0 ;
+  static          int lastTemp   = 0 ;
+  static          int lastRh     = 0 ;
+  static          int lastResult = TRUE ;
+
+  unsigned char buffer [4] ;
+
+// Don't read more than once a second
+
+  if (millis () < nextTime)
+  {
+    *temp = lastTemp ;
+    *rh   = lastRh ;
+    return lastResult ;
+  }
+  
+  lastResult = maxDetectRead (pin, buffer) ;
+
+  if (lastResult)
+  {
+    *temp      = lastTemp   = (buffer [2] * 256 + buffer [3]) ;
+    *rh        = lastRh     = (buffer [0] * 256 + buffer [1]) ;
+    nextTime   = millis () + 2000 ;
+    return TRUE ;
+  }
+  else
+  {
+    return FALSE ;
+  }
+}

devLib/maxdetect.h

@@ -0,0 +1,40 @@
+/*
+ * maxdetect.h:
+ *	Driver for the MaxDetect series sensors
+ *
+ * Copyright (c) 2013 Gordon Henderson.
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Main generic function
+
+int maxDetectRead (const int pin, unsigned char buffer [4]) ;
+
+// Individual sensors
+
+int readRHT03 (const int pin, int *temp, int *rh) ;
+
+#ifdef __cplusplus
+}
+#endif

devLib/piFace.c

@@ -0,0 +1,112 @@
+/*
+ * piFace.:
+ *	This file to interface with the PiFace peripheral device which
+ *	has an MCP23S17 GPIO device connected via the SPI bus.
+ *
+ *	Copyright (c) 2012-2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+
+#include <stdio.h>
+#include <stdint.h>
+
+#include <wiringPi.h>
+#include <mcp23s17.h>
+
+#include "piFace.h"
+
+
+/*
+ * myDigitalWrite:
+ *	Perform the digitalWrite function on the PiFace board
+ *********************************************************************************
+ */
+
+void myDigitalWrite (struct wiringPiNodeStruct *node, int pin, int value)
+{
+  digitalWrite (pin + 16, value) ;
+}
+
+
+/*
+ * myDigitalRead:
+ *	Perform the digitalRead function on the PiFace board
+ *	With a slight twist - if we read from base + 8, then we
+ *	read from the output latch...
+ *********************************************************************************
+ */
+
+int myDigitalRead (struct wiringPiNodeStruct *node, int pin)
+{
+  if ((pin - node->pinBase) >= 8)
+    return digitalRead (pin + 8) ;
+  else
+    return digitalRead (pin + 16 + 8) ;
+}
+
+
+/*
+ * myPullUpDnControl:
+ *	Perform the pullUpDnControl function on the PiFace board
+ *********************************************************************************
+ */
+
+void myPullUpDnControl (struct wiringPiNodeStruct *node, int pin, int pud)
+{
+  pullUpDnControl (pin + 16 + 8, pud) ;
+}
+
+
+/*
+ * piFaceSetup
+ *	We're going to create an instance of the mcp23s17 here, then
+ *	provide our own read/write routines on-top of it...
+ *	The supplied PiFace code (in Pithon) treats it as an 8-bit device
+ *	where you write the output ports and read the input port using the
+ *	same pin numbers, however I have had a request to be able to read
+ *	the output port, so reading 8..15 will read the output latch.
+ *********************************************************************************
+ */
+
+int piFaceSetup (const int pinBase)
+{
+  int    i ;
+  struct wiringPiNodeStruct *node ;
+
+// Create an mcp23s17 instance:
+
+   mcp23s17Setup (pinBase + 16, 0, 0) ;
+
+// Set the direction bits
+
+  for (i = 0 ; i < 8 ; ++i)
+  {
+    pinMode (pinBase + 16 +     i, OUTPUT) ;	// Port A is the outputs
+    pinMode (pinBase + 16 + 8 + i, INPUT) ;	// Port B inputs.
+  }
+
+  node = wiringPiNewNode (pinBase, 16) ;
+  node->digitalRead     = myDigitalRead ;
+  node->digitalWrite    = myDigitalWrite ;
+  node->pullUpDnControl = myPullUpDnControl ;
+
+  return 0 ;
+}

devLib/piFace.h

@@ -0,0 +1,32 @@
+/*
+ * piFace.h:
+ *	Control the PiFace Interface board for the Raspberry Pi
+ *	Copyright (c) 2012-2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern int  piFaceSetup (const int pinBase) ;
+
+#ifdef __cplusplus
+}
+#endif

devLib/piFaceOld.c

@@ -0,0 +1,178 @@
+/*
+ * piFace.:
+ *	Arduino compatable (ish) Wiring library for the Raspberry Pi
+ *	Copyright (c) 2012-2013 Gordon Henderson
+ *
+ *	This file to interface with the PiFace peripheral device which
+ *	has an MCP23S17 GPIO device connected via the SPI bus.
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+
+#include <stdio.h>
+#include <stdint.h>
+
+#include <wiringPi.h>
+#include <wiringPiSPI.h>
+
+#include "../wiringPi/mcp23x0817.h"
+
+#include "piFace.h"
+
+#define	PIFACE_SPEED	4000000
+#define	PIFACE_DEVNO	0
+
+
+
+/*
+ * writeByte:
+ *	Write a byte to a register on the MCP23S17 on the SPI bus.
+ *********************************************************************************
+ */
+
+static void writeByte (uint8_t reg, uint8_t data)
+{
+  uint8_t spiData [4] ;
+
+  spiData [0] = CMD_WRITE ;
+  spiData [1] = reg ;
+  spiData [2] = data ;
+
+  wiringPiSPIDataRW (PIFACE_DEVNO, spiData, 3) ;
+}
+
+/*
+ * readByte:
+ *	Read a byte from a register on the MCP23S17 on the SPI bus.
+ *********************************************************************************
+ */
+
+static uint8_t readByte (uint8_t reg)
+{
+  uint8_t spiData [4] ;
+
+  spiData [0] = CMD_READ ;
+  spiData [1] = reg ;
+
+  wiringPiSPIDataRW (PIFACE_DEVNO, spiData, 3) ;
+
+  return spiData [2] ;
+}
+
+
+/*
+ * myDigitalWrite:
+ *	Perform the digitalWrite function on the PiFace board
+ *********************************************************************************
+ */
+
+void myDigitalWrite (struct wiringPiNodeStruct *node, int pin, int value)
+{
+  uint8_t mask, old ;
+
+  pin -= node->pinBase ;
+  mask = 1 << pin ;
+  old  = readByte (MCP23x17_GPIOA) ;
+
+  if (value == 0)
+    old &= (~mask) ;
+  else
+    old |=   mask ;
+
+  writeByte (MCP23x17_GPIOA, old) ;
+}
+
+
+/*
+ * myDigitalRead:
+ *	Perform the digitalRead function on the PiFace board
+ *********************************************************************************
+ */
+
+int myDigitalRead (struct wiringPiNodeStruct *node, int pin)
+{
+  uint8_t mask, reg ;
+
+  mask = 1 << ((pin - node->pinBase) & 7) ;
+
+  if (pin < 8)
+    reg = MCP23x17_GPIOB ;	// Input regsiter
+  else
+    reg = MCP23x17_OLATA ;	// Output latch regsiter
+
+  if ((readByte (reg) & mask) != 0)
+    return HIGH ;
+  else
+    return LOW ;
+}
+
+
+/*
+ * myPullUpDnControl:
+ *	Perform the pullUpDnControl function on the PiFace board
+ *********************************************************************************
+ */
+
+void myPullUpDnControl (struct wiringPiNodeStruct *node, int pin, int pud)
+{
+  uint8_t mask, old ;
+
+  mask = 1 << (pin - node->pinBase) ;
+  old  = readByte (MCP23x17_GPPUB) ;
+
+  if (pud == 0)
+    old &= (~mask) ;
+  else
+    old |=   mask ;
+
+  writeByte (MCP23x17_GPPUB, old) ;
+}
+
+
+/*
+ * piFaceSetup
+ *	Setup the SPI interface and initialise the MCP23S17 chip
+ *	We create one node with 16 pins - each if the first 8 pins being read
+ *	and write - although the operations actually go to different
+ *	hardware ports. The top 8 let you read the state of the output register.
+ *********************************************************************************
+ */
+
+int piFaceSetup (const int pinBase)
+{
+  int    x ;
+  struct wiringPiNodeStruct *node ;
+
+  if ((x = wiringPiSPISetup (PIFACE_DEVNO, PIFACE_SPEED)) < 0)
+    return x ;
+
+// Setup the MCP23S17
+
+  writeByte (MCP23x17_IOCON,  IOCON_INIT) ;
+  writeByte (MCP23x17_IODIRA, 0x00) ;		// Port A -> Outputs
+  writeByte (MCP23x17_IODIRB, 0xFF) ;		// Port B -> Inputs
+
+  node = wiringPiNewNode (pinBase, 16) ;
+  node->digitalRead     = myDigitalRead ;
+  node->digitalWrite    = myDigitalWrite ;
+  node->pullUpDnControl = myPullUpDnControl ;
+
+  return 0 ;
+}

examples/Gertboard/7segments.c

@@ -0,0 +1,221 @@
+/*
+ * 7segments.c:
+ *	Simple test program to see if we can drive a 7-segment LED
+ *	display using the GPIO and little else on the Raspberry Pi
+ *
+ *	Copyright (c) 2013 Gordon Henderson
+ ***********************************************************************
+ */
+
+#undef	PHOTO_HACK
+
+#include <wiringPi.h>
+
+#include <stdio.h>
+#include <time.h>
+#include <ctype.h>
+#include <string.h>
+
+/*
+ *  Segment mapping
+ *
+ *	 --a--
+ *	|     |
+ *	f     b
+ *	|     |
+ *	 --g--
+ *	|     |
+ *	e     c
+ *	|     |
+ *	 --d--  p
+ */
+
+// GPIO Pin Mapping
+
+static int digits   [6] = {  7, 11, 10, 13, 12, 14    } ;
+static int segments [7] = {  6,  5,  4,  3,  2,  1, 0 } ;
+
+
+static const int segmentDigits [] =
+{
+// a  b  c  d  e  f  g     Segments
+// 6  5  4  3  2  1  0,	// wiringPi pin No.
+
+   1, 1, 1, 1, 1, 1, 0,	// 0
+   0, 1, 1, 0, 0, 0, 0,	// 1
+   1, 1, 0, 1, 1, 0, 1,	// 2
+   1, 1, 1, 1, 0, 0, 1,	// 3
+   0, 1, 1, 0, 0, 1, 1,	// 4
+   1, 0, 1, 1, 0, 1, 1,	// 5
+   1, 0, 1, 1, 1, 1, 1,	// 6
+   1, 1, 1, 0, 0, 0, 0,	// 7
+   1, 1, 1, 1, 1, 1, 1,	// 8
+   1, 1, 1, 1, 0, 1, 1,	// 9
+   1, 1, 1, 0, 1, 1, 1,	// A
+   0, 0, 1, 1, 1, 1, 1,	// b
+   1, 0, 0, 1, 1, 1, 0,	// C
+   0, 1, 1, 1, 1, 0, 1,	// d
+   1, 0, 0, 1, 1, 1, 1,	// E
+   1, 0, 0, 0, 1, 1, 1,	// F
+   0, 0, 0, 0, 0, 0, 0,	// blank
+} ;
+ 
+
+// display:
+//	A global variable which is written to by the main program and
+//	read from by the thread that updates the display. Only the first
+//	6 characters are used.
+
+char display [8] ;
+
+
+/*
+ * displayDigits:
+ *	This is our thread that's run concurrently with the main program.
+ *	Essentially sit in a loop, parsing and displaying the data held in
+ *	the "display" global.
+ *********************************************************************************
+ */
+
+PI_THREAD (displayDigits)
+{
+  int digit, segment ;
+  int index, d, segVal ;
+
+  piHiPri (50) ;
+
+  for (;;)
+  {
+    for (digit = 0 ; digit < 6 ; ++digit)
+    {
+      for (segment = 0 ; segment < 7 ; ++segment)
+      {
+	d = toupper (display [digit]) ;
+	/**/ if ((d >= '0') && (d <= '9'))	// Digit
+	  index = d - '0' ;
+	else if ((d >= 'A') && (d <= 'F'))	// Hex
+	  index = d - 'A' + 10 ;
+	else
+	  index = 16 ;				// Blank
+
+	segVal = segmentDigits [index * 7 + segment] ;
+
+	digitalWrite (segments [segment], segVal) ;
+      }
+      digitalWrite (digits [digit], 1) ;
+      delay (2) ;
+      digitalWrite (digits [digit], 0) ;
+    }
+  }
+}
+
+
+/*
+ * setup:
+ *	Initialise the hardware and start the thread
+ *********************************************************************************
+ */
+
+void setup (void)
+{
+  int i, c ;
+
+  wiringPiSetup () ;
+
+// 7 segments
+
+  for (i = 0 ; i < 7 ; ++i)
+    { digitalWrite (segments [i], 0) ; pinMode (segments [i], OUTPUT) ; }
+
+// 6 digits
+
+  for (i = 0 ; i < 6 ; ++i)
+    { digitalWrite (digits [i], 0) ;   pinMode (digits [i],   OUTPUT) ; }
+
+  strcpy (display, "      ") ;
+  piThreadCreate (displayDigits) ;
+  delay (10) ; // Just to make sure it's started
+
+// Quick countdown LED test sort of thing
+
+  c = 999999 ;
+  for (i = 0 ; i < 10 ; ++i)
+  {
+    sprintf (display, "%06d", c) ;
+    delay (400) ;
+    c -= 111111 ;
+  }
+
+  strcpy (display, "      ") ;
+  delay (400) ;
+
+#ifdef PHOTO_HACK
+  sprintf (display, "%s", "123456") ;
+  for (;;)
+    delay (1000) ;
+#endif
+
+}
+
+
+/*
+ * teenager:
+ *	No explanation needed. (Nor one given!)
+ *********************************************************************************
+ */
+
+void teenager (void)
+{
+  char *message = "      feedbeef      babe      cafe      b00b      " ;
+  int i ;
+
+  for (i = 0 ; i < strlen (message) - 4 ; ++i)
+  {
+    strncpy (display, &message [i], 6) ;
+    delay (200) ;
+  }
+  delay (1000) ;
+  for (i = 0 ; i < 3 ; ++i)
+  {
+    strcpy (display, "    ") ;
+    delay (150) ;
+    strcpy (display, " b00b ") ;
+    delay (250) ;
+  }
+  delay (1000) ;
+  strcpy (display, "      ") ;
+  delay (1000) ;
+}
+
+
+/*
+ *********************************************************************************
+ * main:
+ *	Let the fun begin
+ *********************************************************************************
+ */
+
+int main (void)
+{
+  struct tm *t ;
+  time_t     tim ;
+
+  setup    () ;
+  teenager () ;
+
+  tim = time (NULL) ;
+  for (;;)
+  {
+    while (time (NULL) == tim)
+      delay (5) ;
+
+    tim = time (NULL) ;
+    t   = localtime (&tim) ;
+
+    sprintf (display, "%02d%02d%02d", t->tm_hour, t->tm_min, t->tm_sec) ;
+
+    delay (500) ;
+  }
+
+  return 0 ;
+}

examples/Gertboard/Makefile

@@ -0,0 +1,74 @@
+#
+# Makefile:
+#	Gertboard - Examples using wiringPi
+#
+#	Copyright (c) 2013 Gordon Henderson
+#################################################################################
+
+#DEBUG	= -g -O0
+DEBUG	= -O3
+CC	= gcc
+INCLUDE	= -I/usr/local/include
+CFLAGS	= $(DEBUG) -Wall $(INCLUDE) -Winline -pipe
+
+LDFLAGS	= -L/usr/local/lib
+LDLIBS    = -lwiringPi -lwiringPiDev -lpthread -lm
+
+# Should not alter anything below this line
+###############################################################################
+
+SRC	=	gertboard.c				\
+		buttons.c 7segments.c			\
+		voltmeter.c temperature.c vumeter.c	\
+		record.c
+
+OBJ	=	$(SRC:.c=.o)
+
+BINS	=	$(SRC:.c=)
+
+all:	$(BINS)
+
+gertboard:	gertboard.o
+	@echo [link]
+	@$(CC) -o $@ gertboard.o $(LDFLAGS) $(LDLIBS)
+
+buttons:	buttons.o
+	@echo [link]
+	@$(CC) -o $@ buttons.o $(LDFLAGS) $(LDLIBS)
+
+7segments:	7segments.o
+	@echo [link]
+	@$(CC) -o $@ 7segments.o $(LDFLAGS) $(LDLIBS)
+
+voltmeter:	voltmeter.o
+	@echo [link]
+	@$(CC) -o $@ voltmeter.o $(LDFLAGS) $(LDLIBS)
+
+temperature:	temperature.o
+	@echo [link]
+	@$(CC) -o $@ temperature.o $(LDFLAGS) $(LDLIBS)
+
+vumeter:	vumeter.o
+	@echo [link]
+	@$(CC) -o $@ vumeter.o $(LDFLAGS) $(LDLIBS)
+
+record:	record.o
+	@echo [link]
+	@$(CC) -o $@ record.o $(LDFLAGS) $(LDLIBS)
+
+.c.o:
+	@echo [CC] $<
+	@$(CC) -c $(CFLAGS) $< -o $@
+
+clean:
+	@echo [Clean]
+	@rm -f $(OBJ) *~ core tags $(BINS)
+
+tags:	$(SRC)
+	@echo [ctags]
+	@ctags $(SRC)
+
+depend:
+	makedepend -Y $(SRC)
+
+# DO NOT DELETE

examples/Gertboard/buttons.c

@@ -0,0 +1,83 @@
+/*
+ * buttons.c:
+ *	Read the Gertboard buttons. Each one will act as an on/off
+ *	tiggle switch for 3 different LEDs
+ *
+ * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+#include <wiringPi.h>
+
+// Array to keep track of our LEDs
+
+int leds [] = { 0, 0, 0 } ;
+
+// scanButton:
+//	See if a button is pushed, if so, then flip that LED and
+//	wait for the button to be let-go
+
+void scanButton (int button)
+{
+  if (digitalRead (button) == HIGH)	// Low is pushed
+    return ;
+
+  leds [button] ^= 1 ; // Invert state
+  digitalWrite (4 + button, leds [button]) ;
+
+  while (digitalRead (button) == LOW)	// Wait for release
+    delay (10) ;
+}
+
+int main (void)
+{
+  int i ;
+
+  printf ("Raspberry Pi Gertboard Button Test\n") ;
+
+  wiringPiSetup () ;
+
+// Setup the outputs:
+//	Pins 3, 4, 5, 6 and 7 output:
+//	We're not using 3 or 4, but make sure they're off anyway
+//	(Using same hardware config as blink12.c)
+
+  for (i = 3 ; i < 8 ; ++i)
+  {
+    pinMode      (i, OUTPUT) ;
+    digitalWrite (i, 0) ;
+  }
+
+// Setup the inputs
+
+  for (i = 0 ; i < 3 ; ++i)
+  {
+    pinMode         (i, INPUT) ;
+    pullUpDnControl (i, PUD_UP) ;
+    leds [i] = 0 ;
+  }
+
+  for (;;)
+  {
+    for (i = 0 ; i < 3 ; ++i)
+      scanButton (i) ;
+    delay (1) ;
+  }
+}

examples/gertboard.c → examples/Gertboard/gertboard.c

@@ -6,8 +6,8 @@
  *		D/A port 0 jumpered to A/D port 0.
  *
  *	We output a sine wave on D/A port 0 and sample A/D port 0. We then
- *	copy this value to D/A port 1 and use a 'scope on both D/A ports
- *	to check all's well.
+ *	plot the input value on the terminal as a sort of vertical scrolling
+ *	oscilloscipe.
  *
  * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
  ***********************************************************************
@@ -30,11 +30,13 @@
  */
 
 #include <stdio.h>
-#include <stdint.h>
+#include <sys/ioctl.h>
+#include <stdlib.h>
 #include <math.h>
 
-#define	B_SIZE	200
-#undef	DO_TIMING
+// Gertboard D to A is an 8-bit unit.
+
+#define	B_SIZE	256
 
 #include <wiringPi.h>
 #include <gertboard.h>
@@ -42,23 +44,28 @@
 int main (void)
 {
   double angle ;
-  int i ;
-  uint32_t x1 ;
+  int i, inputValue ;
   int  buffer [B_SIZE] ;
+  int   cols ;
+  struct winsize w ;
 
-#ifdef	DO_TIMING
-  unsigned int now, then ;
-#endif
 
   printf ("Raspberry Pi Gertboard SPI test program\n") ;
+  printf ("=======================================\n") ;
+
+  ioctl (fileno (stdin), TIOCGWINSZ, &w);
+  cols = w.ws_col - 2 ;
+
+// Always initialise wiringPi. Use wiringPiSys() if you don't need
+//	(or want) to run as root
+
+  wiringPiSetupSys () ;
 
-  if (wiringPiSetupSys () < 0)
-    return -1 ;
+// Initialise the Gertboard analog hardware at pin 100
 
-  if (gertboardSPISetup () < 0)
-    return 1 ;
+  gertboardAnalogSetup (100) ;
 
-// Generate a Sine Wave
+// Generate a Sine Wave and store in our buffer
 
   for (i = 0 ; i < B_SIZE ; ++i)
   {
@@ -66,28 +73,23 @@ int main (void)
     buffer [i] = (int)rint ((sin (angle)) * 127.0 + 128.0) ;
   }
 
+// Loop, output the sine wave on analog out port 0, read it into A-D port 0
+//	and display it on the screen
 
   for (;;)
   {
-#ifdef	DO_TIMING
-    then = millis () ;
-#endif
-
     for (i = 0 ; i < B_SIZE ; ++i)
     {
-      gertboardAnalogWrite (0, buffer [i]) ;
+      analogWrite (100, buffer [i]) ;
 
-#ifndef	DO_TIMING
-      x1 = gertboardAnalogRead (0) ;
-      gertboardAnalogWrite (1, x1 >> 2) ;	// 10-bit A/D, 8-bit D/A
-#endif
-    }
+      inputValue = analogRead (100) ;
 
-#ifdef	DO_TIMING
-    now = millis () ;
-    printf ("%4d mS, %9.7f S/sample", now - then, ((double)(now - then) / 1000.0) / (double)B_SIZE) ;
-    printf (" -> %9.4f samples/sec \n", 1 / (((double)(now - then) / 1000.0) / (double)B_SIZE)) ;
-#endif
+// We don't need to wory about the scale or sign - the analog hardware is
+//	a 10-bit value, so 0-1023. Just scale this to our terminal
+
+      printf ("%*s\n", (inputValue * cols) / 1023, "*") ;
+      delay (2) ;
+    }
   }
 
   return 0 ;

examples/Gertboard/record.c

@@ -0,0 +1,60 @@
+/*
+ * record.c:
+ *	Record some audio via the Gertboard
+ *
+ *	Copyright (c) 2013 Gordon Henderson
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+#include <sys/time.h>
+
+#include <wiringPi.h>
+#include <gertboard.h>
+
+#define	B_SIZE	40000
+
+int main ()
+{
+  int i ;
+  struct timeval tStart, tEnd, tTaken ;
+  unsigned char buffer [B_SIZE] ;
+
+  printf ("\n") ;
+  printf ("Gertboard demo: Recorder\n") ;
+  printf ("========================\n") ;
+
+// Always initialise wiringPi. Use wiringPiSys() if you don't need
+//	(or want) to run as root
+
+  wiringPiSetupSys () ;
+
+// Initialise the Gertboard analog hardware at pin 100
+
+  gertboardAnalogSetup (100) ;
+
+  gettimeofday (&tStart, NULL) ;
+
+  for (i = 0 ; i < B_SIZE ; ++i)
+    buffer [i] = analogRead (100) >> 2 ;
+
+  gettimeofday (&tEnd, NULL) ;
+  
+  timersub (&tEnd, &tStart, &tTaken) ;
+
+  printf ("Time taken for %d  reads: %ld.%ld\n", B_SIZE, tTaken.tv_sec, tTaken.tv_usec) ;
+
+  gettimeofday (&tStart, NULL) ;
+
+  for (i = 0 ; i < B_SIZE ; ++i)
+   analogWrite (100, buffer [i]) ;
+
+  gettimeofday (&tEnd, NULL) ;
+  
+  timersub (&tEnd, &tStart, &tTaken) ;
+
+  printf ("Time taken for %d writes: %ld.%ld\n", B_SIZE, tTaken.tv_sec, tTaken.tv_usec) ;
+
+  return 0 ;
+}
+

examples/Gertboard/temperature.c

@@ -0,0 +1,78 @@
+/*
+ * temperature.c:
+ *	Demonstrate use of the Gertboard A to D converter to make
+ *	a simple thermometer using the LM35.
+ *
+ * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+
+#include <wiringPi.h>
+#include <gertboard.h>
+
+int main ()
+{
+  int x1, x2 ;
+  double v1, v2 ;
+
+  printf ("\n") ;
+  printf ("Gertboard demo: Simple Thermemeter\n") ;
+  printf ("==================================\n") ;
+
+// Always initialise wiringPi. Use wiringPiSys() if you don't need
+//	(or want) to run as root
+
+  wiringPiSetupSys () ;
+
+// Initialise the Gertboard analog hardware at pin 100
+
+  gertboardAnalogSetup (100) ;
+
+  printf ("\n") ;
+  printf ("| Channel 0 | Channel 1 | Temperature 1 | Temperature 2 |\n") ;
+
+  for (;;)
+  {
+
+// Read the 2 channels:
+
+    x1 = analogRead (100) ;
+    x2 = analogRead (101) ;
+
+// Convert to a voltage:
+
+    v1 = (double)x1 / 1023.0 * 3.3 ;
+    v2 = (double)x2 / 1023.0 * 3.3 ;
+
+// Print
+
+    printf ("|    %6.3f |    %6.3f |", v1, v2) ;
+
+// Print Temperature of both channels by converting the LM35 reading
+//	to a temperature. Fortunately these are easy: 0.01 volts per C.
+
+    printf ("          %4.1f |          %4.1f |\r", v1 * 100.0, v2 * 100.0) ;
+    fflush (stdout) ;
+  }
+
+  return 0 ;
+}
+

examples/Gertboard/voltmeter.c

@@ -0,0 +1,73 @@
+/*
+ * voltmeter.c:
+ *	Demonstrate use of the Gertboard A to D converter to make
+ *	a simple voltmeter.
+ *
+ * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+
+#include <wiringPi.h>
+#include <gertboard.h>
+
+int main ()
+{
+  int x1, x2 ;
+  double v1, v2 ;
+
+  printf ("\n") ;
+  printf ("Gertboard demo: Simple Voltmeters\n") ;
+  printf ("=================================\n") ;
+
+// Always initialise wiringPi. Use wiringPiSys() if you don't need
+//	(or want) to run as root
+
+  wiringPiSetupSys () ;
+
+// Initialise the Gertboard analog hardware at pin 100
+
+  gertboardAnalogSetup (100) ;
+
+  printf ("\n") ;
+  printf ("| Channel 0 | Channel 1 |\n") ;
+
+  for (;;)
+  {
+
+// Read the 2 channels:
+
+    x1 = analogRead (100) ;
+    x2 = analogRead (101) ;
+
+// Convert to a voltage:
+
+    v1 = (double)x1 / 1023.0 * 3.3 ;
+    v2 = (double)x2 / 1023.0 * 3.3 ;
+
+// Print
+
+    printf ("|    %6.3f |    %6.3f |\r", v1, v2) ;
+    fflush (stdout) ;
+  }
+
+  return 0 ;
+}
+

examples/Gertboard/vumeter.c

@@ -0,0 +1,152 @@
+/*
+ * vumeter.c:
+ *	Simple VU meter
+ *
+ * Heres the theory:
+ *	We will sample at 4000 samples/sec and put the data into a
+ *	low-pass filter with a depth of 1000 samples. This will give
+ *	us 1/4 a second of lag on the signal, but I think it might
+ *	produce a more pleasing output.
+ *
+ *	The input of the microphone should be at mid-pont with no
+ *	sound input, but we might have to sample that too, to get
+ *	our reference zero...
+ *
+ *	Copyright (c) 2013 Gordon Henderson
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/time.h>
+
+#include <wiringPi.h>
+#include <gertboard.h>
+
+#ifndef	TRUE
+#define	TRUE	(1==1)
+#define	FALSE	(!TRUE)
+#endif
+
+#define	B_SIZE	1000
+#define	S_SIZE	 128
+
+static int buffer [B_SIZE] ;
+static int bPtr = 0 ;
+
+/*
+ * ledPercent:
+ *	Output the given value as a percentage on the LEDs
+ *********************************************************************************
+ */
+
+static void ledPercent (int percent)
+{
+  unsigned int output = 0 ;
+
+  if (percent > 11) output |= 0x01 ;
+  if (percent > 22) output |= 0x02 ;
+  if (percent > 33) output |= 0x04 ;
+  if (percent > 44) output |= 0x08 ;
+  if (percent > 55) output |= 0x10 ;
+  if (percent > 66) output |= 0x20 ;
+  if (percent > 77) output |= 0x40 ;
+  if (percent > 88) output |= 0x80 ;
+
+  digitalWriteByte (output) ;
+}
+
+static unsigned int tPeriod, tNextSampleTime ;
+
+/*
+ * sample:
+ *	Get a sample from the Gertboard. If not enough time has elapsed
+ *	since the last sample, then wait...
+ *********************************************************************************
+ */
+
+static void sample (void)
+{
+  unsigned int tFuture ;
+
+// Calculate the future sample time
+
+  tFuture = tPeriod + tNextSampleTime ;
+
+// Wait until the next sample time
+
+  while (micros () < tNextSampleTime)
+    ;
+  
+  buffer [bPtr] = gertboardAnalogRead (0) ;
+
+  tNextSampleTime = tFuture ;
+}
+
+
+int main ()
+{
+  int quietLevel, min, max ;
+  int i, sum ;
+  unsigned int tStart, tEnd ;
+
+  printf ("\n") ;
+  printf ("Gertboard demo: VU Meter\n") ;
+  printf ("========================\n") ;
+
+  wiringPiSetup     () ;
+  gertboardSPISetup () ;
+
+  ledPercent (0) ;
+  for (i = 0 ; i < 8 ; ++i)
+    pinMode (i, OUTPUT) ;
+
+  for (bPtr = 0 ; bPtr < B_SIZE ; ++bPtr)
+    buffer [bPtr] = 99 ;
+
+  tPeriod = 1000000 / 1000 ;
+
+  printf ("Shhhh.... ") ; fflush (stdout) ;
+  delay (1000) ;
+  printf ("Sampling quiet... ") ; fflush (stdout) ;
+
+  tStart = micros () ;
+
+  tNextSampleTime = micros () ;
+  for (bPtr = 0 ; bPtr < B_SIZE ; ++bPtr)
+    sample () ;
+
+  tEnd = micros () ;
+
+  quietLevel = 0 ;
+  max =    0 ;
+  min = 1024 ;
+  for (i = 0 ; i < B_SIZE ; ++i)
+  {
+    quietLevel += buffer [i] ;
+    if (buffer [i] > max) max = buffer [i] ;
+    if (buffer [i] < min) min = buffer [i] ;
+  }
+  quietLevel /= B_SIZE ;
+
+  printf ("Done. Quiet level is: %d [%d:%d] [%d:%d]\n", quietLevel, min, max, quietLevel - min, max - quietLevel) ;
+
+  printf ("Time taken for %d reads: %duS\n", B_SIZE, tEnd - tStart) ;
+
+  for (bPtr = 0 ;;)
+  {
+    sample () ;
+    sum = 0 ;
+    for (i = 0 ; i < S_SIZE ; ++i)
+      sum += buffer [i] ;
+    sum /= S_SIZE ;
+    sum = abs (quietLevel - sum) ;
+    sum = (sum * 1000) / quietLevel ;
+    ledPercent (sum) ;
+    if (++bPtr > S_SIZE)
+      bPtr = 0 ;
+  }
+
+
+  return 0 ;
+}

examples/Makefile

@@ -30,15 +30,19 @@ INCLUDE	= -I/usr/local/include
 CFLAGS	= $(DEBUG) -Wall $(INCLUDE) -Winline -pipe
 
 LDFLAGS	= -L/usr/local/lib
-LDLIBS    = -lwiringPi -lpthread -lm
+LDLIBS    = -lwiringPi -lwiringPiDev -lpthread -lm
 
 # Should not alter anything below this line
 ###############################################################################
 
-SRC	=	blink.c test1.c test2.c speed.c lcd.c wfi.c isr.c isr-osc.c	\
-		piface.c gertboard.c nes.c					\
-		pwm.c tone.c servo.c						\
-		delayTest.c serialRead.c serialTest.c okLed.c
+SRC	=	blink.c blink8.c blink12.c					\
+		pwm.c								\
+		speed.c wfi.c isr.c isr-osc.c					\
+		lcd.c clock.c							\
+		nes.c								\
+		softPwm.c softTone.c 						\
+		delayTest.c serialRead.c serialTest.c okLed.c ds1302.c		\
+		rht03.c
 
 OBJ	=	$(SRC:.c=.o)
 
@@ -55,13 +59,13 @@ blink:	blink.o
 	@echo [link]
 	@$(CC) -o $@ blink.o $(LDFLAGS) $(LDLIBS)
 
-test1:	test1.o
+blink8:	blink8.o
 	@echo [link]
-	@$(CC) -o $@ test1.o $(LDFLAGS) $(LDLIBS)
-	
-test2:	test2.o
+	@$(CC) -o $@ blink8.o $(LDFLAGS) $(LDLIBS)
+
+blink12:	blink12.o
 	@echo [link]
-	@$(CC) -o $@ test2.o $(LDFLAGS) $(LDLIBS)
+	@$(CC) -o $@ blink12.o $(LDFLAGS) $(LDLIBS)
 
 speed:	speed.o
 	@echo [link]
@@ -71,6 +75,10 @@ lcd:	lcd.o
 	@echo [link]
 	@$(CC) -o $@ lcd.o $(LDFLAGS) $(LDLIBS)
 
+clock:	clock.o
+	@echo [link]
+	@$(CC) -o $@ clock.o $(LDFLAGS) $(LDLIBS)
+
 wfi:	wfi.o
 	@echo [link]
 	@$(CC) -o $@ wfi.o $(LDFLAGS) $(LDLIBS)
@@ -83,22 +91,26 @@ isr-osc:	isr-osc.o
 	@echo [link]
 	@$(CC) -o $@ isr-osc.o $(LDFLAGS) $(LDLIBS)
 
-piface:	piface.o
-	@echo [link]
-	@$(CC) -o $@ piface.o $(LDFLAGS) $(LDLIBS)
-
-gertboard:	gertboard.o
-	@echo [link]
-	@$(CC) -o $@ gertboard.o $(LDFLAGS) $(LDLIBS)
-
 nes:	nes.o
 	@echo [link]
 	@$(CC) -o $@ nes.o $(LDFLAGS) $(LDLIBS) 
 
+rht03:	rht03.o
+	@echo [link]
+	@$(CC) -o $@ rht03.o $(LDFLAGS) $(LDLIBS) 
+
 pwm:	pwm.o
 	@echo [link]
 	@$(CC) -o $@ pwm.o $(LDFLAGS) $(LDLIBS)
 
+softPwm:	softPwm.o
+	@echo [link]
+	@$(CC) -o $@ softPwm.o $(LDFLAGS) $(LDLIBS)
+
+softTone:	softTone.o
+	@echo [link]
+	@$(CC) -o $@ softTone.o $(LDFLAGS) $(LDLIBS)
+
 delayTest:	delayTest.o
 	@echo [link]
 	@$(CC) -o $@ delayTest.o $(LDFLAGS) $(LDLIBS)
@@ -119,9 +131,9 @@ tone:	tone.o
 	@echo [link]
 	@$(CC) -o $@ tone.o $(LDFLAGS) $(LDLIBS)
 
-servo:	servo.o
+ds1302:	ds1302.o
 	@echo [link]
-	@$(CC) -o $@ servo.o $(LDFLAGS) $(LDLIBS)
+	@$(CC) -o $@ ds1302.o $(LDFLAGS) $(LDLIBS)
 
 
 .c.o:
@@ -129,7 +141,8 @@ servo:	servo.o
 	@$(CC) -c $(CFLAGS) $< -o $@
 
 clean:
-	rm -f $(OBJ) *~ core tags $(BINS)
+	@echo "[Clean]"
+	@rm -f $(OBJ) *~ core tags $(BINS)
 
 tags:	$(SRC)
 	@echo [ctags]

examples/PiFace/Makefile

@@ -0,0 +1,85 @@
+#
+# Makefile:
+#	wiringPi - Wiring Compatable library for the Raspberry Pi
+#	https://projects.drogon.net/wiring-pi
+#
+#	Copyright (c) 2012 Gordon Henderson
+#################################################################################
+# This file is part of wiringPi:
+#	Wiring Compatable library for the Raspberry Pi
+#
+#    wiringPi is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Lesser General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    wiringPi is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU Lesser General Public License for more details.
+#
+#    You should have received a copy of the GNU Lesser General Public License
+#    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+#################################################################################
+
+
+#DEBUG	= -g -O0
+DEBUG	= -O3
+CC	= gcc
+INCLUDE	= -I/usr/local/include
+CFLAGS	= $(DEBUG) -Wall $(INCLUDE) -Winline -pipe
+
+LDFLAGS	= -L/usr/local/lib
+LDLIBS    = -lwiringPi -lwiringPiDev -lpthread -lm
+
+# Should not alter anything below this line
+###############################################################################
+
+SRC	=	blink.c buttons.c reaction.c ladder.c metro.c motor.c
+
+OBJ	=	$(SRC:.c=.o)
+
+BINS	=	$(SRC:.c=)
+
+all:	$(BINS)
+
+blink:	blink.o
+	@echo [link]
+	@$(CC) -o $@ blink.o $(LDFLAGS) $(LDLIBS)
+
+buttons:	buttons.o
+	@echo [link]
+	@$(CC) -o $@ buttons.o $(LDFLAGS) $(LDLIBS)
+
+reaction:	reaction.o
+	@echo [link]
+	@$(CC) -o $@ reaction.o $(LDFLAGS) $(LDLIBS)
+
+ladder:	ladder.o
+	@echo [link]
+	@$(CC) -o $@ ladder.o $(LDFLAGS) $(LDLIBS)
+
+metro:	metro.o
+	@echo [link]
+	@$(CC) -o $@ metro.o $(LDFLAGS) $(LDLIBS)
+
+motor:	motor.o
+	@echo [link]
+	@$(CC) -o $@ motor.o $(LDFLAGS) $(LDLIBS)
+
+.c.o:
+	@echo [CC] $<
+	@$(CC) -c $(CFLAGS) $< -o $@
+
+clean:
+	@echo "[Clean]"
+	@rm -f $(OBJ) *~ core tags $(BINS)
+
+tags:	$(SRC)
+	@echo [ctags]
+	@ctags $(SRC)
+
+depend:
+	makedepend -Y $(SRC)
+
+# DO NOT DELETE

examples/PiFace/blink.c

@@ -0,0 +1,59 @@
+/*
+ * blink.c:
+ *	Simple "blink" test for the PiFace interface board.
+ *
+ * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+
+#include <wiringPi.h>
+#include <piFace.h>
+
+// Use 200 as the pin-base for the PiFace board, and pick a pin
+//	for the LED that's not connected to a relay
+
+#define	PIFACE	200
+#define	LED	(PIFACE+2)
+
+int main (int argc, char *argv [])
+{
+  printf ("Raspberry Pi PiFace Blink\n") ;
+  printf ("=========================\n") ;
+
+// Always initialise wiringPi. Use wiringPiSys() if you don't need
+//	(or want) to run as root
+
+  wiringPiSetupSys () ;
+
+// Setup the PiFace board
+
+  piFaceSetup (PIFACE) ;
+
+  for (;;)
+  {
+    digitalWrite (LED, HIGH) ;	// On
+    delay (500) ;		// mS
+    digitalWrite (LED, LOW) ;	// Off
+    delay (500) ;
+  }
+
+  return 0 ;
+}

examples/PiFace/buttons.c

@@ -0,0 +1,103 @@
+/*
+ * buttons.c:
+ *	Simple test for the PiFace interface board.
+ *
+ *	Read the buttons and output the same to the LEDs
+ *
+ * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+
+#include <wiringPi.h>
+#include <piFace.h>
+
+int outputs [4] = { 0,0,0,0 } ;
+
+// Use 200 as the pin-base for the PiFace board
+
+#define	PIFACE_BASE	200
+
+
+/*
+ * scanButton:
+ *	Read the guiven button - if it's pressed, then flip the state
+ *	of the correspoinding output pin
+ *********************************************************************************
+ */
+
+void scanButton (int button)
+{
+  if (digitalRead (PIFACE_BASE + button) == LOW)
+  {
+    outputs [button] ^= 1 ;
+    digitalWrite (PIFACE_BASE + button, outputs [button]) ;
+    printf ("Button %d pushed - output now: %s\n",
+		button, (outputs [button] == 0) ? "Off" : "On") ;
+  }
+
+  while (digitalRead (PIFACE_BASE + button) == LOW)
+    delay (1) ;
+}
+
+
+/*
+ * start here
+ *********************************************************************************
+ */
+
+int main (void)
+{
+  int pin, button ;
+
+  printf ("Raspberry Pi wiringPi + PiFace test program\n") ;
+  printf ("===========================================\n") ;
+  printf ("\n") ;
+  printf (
+"This program reads the buttons and uses them to toggle the first 4\n"
+"outputs. Push a button once to turn an output on, and push it again to\n"
+"turn it off again.\n\n") ;
+
+// Always initialise wiringPi. Use wiringPiSys() if you don't need
+//	(or want) to run as root
+
+  wiringPiSetupSys () ;
+
+  piFaceSetup (PIFACE_BASE) ;
+
+// Enable internal pull-ups & start with all off
+
+  for (pin = 0 ; pin < 8 ; ++pin)
+  {
+    pullUpDnControl (PIFACE_BASE + pin, PUD_UP) ;
+    digitalWrite    (PIFACE_BASE + pin, 0) ;
+  }
+
+// Loop, scanning the buttons
+
+  for (;;)
+  {
+    for (button = 0 ; button < 4 ; ++button)
+      scanButton (button) ;
+    delay (5) ;
+  }
+
+  return 0 ;
+}

examples/PiFace/ladder.c

@@ -0,0 +1,337 @@
+/*
+ * ladder.c:
+ *
+ *	Gordon Henderson, June 2012
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <math.h>
+
+#include <wiringPi.h>
+#include <piFace.h>
+
+#ifndef	TRUE
+#  define	TRUE	(1==1)
+#  define	FALSE	(1==2)
+#endif
+
+#undef	DEBUG
+
+#define	NUM_LEDS	 8
+
+
+// Map the LEDs to the hardware pins
+//	using PiFace pin numbers here
+
+#define	PIFACE	200
+
+const int ledMap [NUM_LEDS] =
+{
+//  0, 1, 2, 3, 4, 5, 6, 7, 8
+    200, 201, 202, 203, 204, 205, 206, 207
+} ;
+
+
+// Some constants for our circuit simulation
+
+const double vBatt      =      9.0 ;	// Volts (ie. a PP3)
+const double capacitor  =      0.001 ;	// 1000uF
+const double rCharge    =   2200.0 ;	// ohms
+const double rDischarge =  68000.0 ;	// ohms
+const double timeInc    =      0.01 ;	// Seconds
+
+double vCharge, vCap, vCapLast ;
+
+
+
+/*
+ * setup:
+ *	Program the GPIO correctly and initialise the lamps
+ ***********************************************************************
+ */
+
+void setup (void)
+{
+  int i ;
+
+  wiringPiSetupSys () ;
+
+  if (piFaceSetup (200) == -1)
+    exit (1) ;
+
+// Enable internal pull-ups
+
+  for (i = 0 ; i < 8 ; ++i)
+    pullUpDnControl (PIFACE + i, PUD_UP) ;
+
+// Calculate the actual charging voltage - standard calculation of
+//	vCharge = r2 / (r1 + r2) * vBatt
+//
+//
+//   -----+--- vBatt
+//        |
+//        R1
+//        |
+//        +---+---- vCharge
+//        |   |
+//        R2  C
+//        |   |
+//   -----+---+-----
+
+  vCharge = rDischarge / (rCharge + rDischarge) * vBatt ;
+
+// Start with no charge
+
+  vCap    = vCapLast = 0.0 ;
+}
+
+
+/*
+ * introLeds
+ *	Put a little pattern on the LEDs to start with
+ *********************************************************************************
+ */
+
+void introLeds (void)
+{
+  int i, j ;
+
+
+  printf ("Pi Ladder\n") ;
+  printf ("=========\n\n") ;
+  printf ("       vBatt: %6.2f volts\n", vBatt) ;
+  printf ("     rCharge: %6.0f ohms\n", rCharge) ;
+  printf ("  rDischarge: %6.0f ohms\n", rDischarge) ;
+  printf ("     vCharge: %6.2f volts\n", vCharge) ;
+  printf ("   capacitor: %6.0f uF\n", capacitor * 1000.0) ;
+
+// Flash 3 times:
+
+  for (j = 0 ; j < 3 ; ++j)
+  {
+    for (i = 0 ; i < NUM_LEDS ; ++i)
+      digitalWrite (ledMap [i], 1) ;
+    delay (500) ;
+    for (i = 0 ; i < NUM_LEDS ; ++i)
+      digitalWrite (ledMap [i], 0) ;
+    delay (100) ;
+  }
+
+// All On
+
+  for (i = 0 ; i < NUM_LEDS ; ++i)
+    digitalWrite (ledMap [i], 1) ;
+  delay (500) ;
+
+// Countdown...
+
+  for (i = NUM_LEDS - 1 ; i >= 0 ; --i)
+  {
+    digitalWrite (ledMap [i], 0) ;
+    delay (100) ;
+  }
+  delay (500) ;
+}
+
+
+/*
+ * winningLeds
+ *	Put a little pattern on the LEDs to start with
+ *********************************************************************************
+ */
+
+void winningLeds (void)
+{
+  int i, j ;
+
+// Flash 3 times:
+
+  for (j = 0 ; j < 3 ; ++j)
+  {
+    for (i = 0 ; i < NUM_LEDS ; ++i)
+      digitalWrite (ledMap [i], 1) ;
+    delay (500) ;
+    for (i = 0 ; i < NUM_LEDS ; ++i)
+      digitalWrite (ledMap [i], 0) ;
+    delay (100) ;
+  }
+
+// All On
+
+  for (i = 0 ; i < NUM_LEDS ; ++i)
+    digitalWrite (ledMap [i], 1) ;
+  delay (500) ;
+
+// Countup...
+
+  for (i = 0 ; i < NUM_LEDS ; ++i)
+  {
+    digitalWrite (ledMap [i], 0) ;
+    delay (100) ;
+  }
+  delay (500) ;
+}
+
+
+/*
+ * chargeCapacitor: dischargeCapacitor:
+ *	Add or remove charge to the capacitor.
+ *	Standard capacitor formulae.
+ *********************************************************************************
+ */
+
+void chargeCapacitor (void)
+{
+  vCap = (vCapLast - vCharge) *
+	exp (- timeInc / (rCharge * capacitor)) + vCharge ;
+
+#ifdef	DEBUG
+  printf ("+vCap: %7.4f\n", vCap) ;
+#endif
+
+  vCapLast = vCap ;
+}
+
+void dischargeCapacitor (void)
+{
+  vCap = vCapLast *
+	exp (- timeInc / (rDischarge * capacitor)) ;
+
+#ifdef	DEBUG
+  printf ("-vCap: %7.4f\n", vCap) ;
+#endif
+
+  vCapLast = vCap ;
+}
+
+
+/*
+ * ledBargraph:
+ *	Output the supplied number as a bargraph on the LEDs
+ *********************************************************************************
+ */
+
+void ledBargraph (double value, int topLedOn)
+{
+  int topLed = (int)floor (value / vCharge * (double)NUM_LEDS) + 1 ;
+  int i ;
+
+  if (topLed > NUM_LEDS)
+    topLed = NUM_LEDS ;
+
+  if (!topLedOn)
+    --topLed ;
+
+  for (i = 0 ; i < topLed ; ++i)
+    digitalWrite (ledMap [i], 1) ;
+
+  for (i = topLed ; i < NUM_LEDS ; ++i)
+    digitalWrite (ledMap [i], 0) ;
+}
+
+
+/*
+ * ledOnAction:
+ *	Make sure the leading LED is on and check the button
+ *********************************************************************************
+ */
+
+void ledOnAction (void)
+{
+  if (digitalRead (PIFACE) == LOW)
+  {
+    chargeCapacitor () ;
+    ledBargraph (vCap, TRUE) ;
+  }
+}
+
+
+/*
+ * ledOffAction:
+ *	Make sure the leading LED is off and check the button
+ *********************************************************************************
+ */
+
+void ledOffAction (void)
+{
+  dischargeCapacitor () ;
+
+// Are we still pushing the button?
+
+  if (digitalRead (PIFACE) == LOW)
+  {
+    vCap = vCapLast = 0.0 ;
+    ledBargraph (vCap, FALSE) ;
+
+// Wait until we release the button
+
+    while (digitalRead (PIFACE) == LOW)
+      delay (10) ;
+  }
+}
+
+
+/*
+ ***********************************************************************
+ * The main program
+ ***********************************************************************
+ */
+
+int main (void)
+{
+  unsigned int then, ledOnTime, ledOffTime ;
+  unsigned int ourDelay = (int)(1000.0 * timeInc) ;
+  
+  setup     () ;
+  introLeds () ;
+
+// Setup the LED times - TODO reduce the ON time as the game progresses
+
+  ledOnTime  = 1000 ;
+  ledOffTime = 1000 ;
+
+// This is our Gate/Squarewave loop
+
+  for (;;)
+  {
+
+// LED ON:
+
+    (void)ledBargraph (vCap, TRUE) ;
+    then = millis () + ledOnTime ;
+    while (millis () < then)
+    {
+      ledOnAction () ;
+      delay       (ourDelay) ;
+    }
+
+// Have we won yet?
+//	We need vCap to be in the top NUM_LEDS of the vCharge
+
+    if (vCap > ((double)(NUM_LEDS - 1) / (double)NUM_LEDS * vCharge))	// Woo hoo!
+    {
+      winningLeds () ;
+      while (digitalRead (PIFACE) == HIGH)
+	delay (10) ;
+      while (digitalRead (PIFACE) == LOW)
+	delay (10) ;
+      vCap = vCapLast = 0.0 ;
+    }
+
+// LED OFF:
+
+    (void)ledBargraph (vCap, FALSE) ;
+    then = millis () + ledOffTime ;
+    while (millis () < then)
+    {
+      ledOffAction () ;
+      delay        (ourDelay) ;
+    }
+
+  }
+
+  return 0 ;
+}

examples/PiFace/metro.c

@@ -0,0 +1,111 @@
+/*
+ * metronome.c:
+ *	Simple test for the PiFace interface board.
+ *
+ * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <wiringPi.h>
+#include <piFace.h>
+
+#define	PIFACE	200
+
+/*
+ * middleA:
+ *	Play middle A (on the relays - yea!)
+ *********************************************************************************
+ */
+
+static void middleA (void)
+{
+  unsigned int next ;
+
+  for (;;)
+  {
+    next = micros () + 1136 ;
+    digitalWrite (PIFACE + 0, 0)  ;
+    digitalWrite (PIFACE + 1, 0)  ;
+    while (micros () < next)
+      delayMicroseconds (1) ;
+    
+    next = micros () + 1137 ;
+    digitalWrite (PIFACE + 0, 1)  ;
+    digitalWrite (PIFACE + 1, 1)  ;
+    while (micros () < next)
+      delayMicroseconds (1) ;
+    
+  }
+}
+
+
+int main (int argc, char *argv [])
+{
+  int bpm, msPerBeat, state = 0 ;
+  unsigned int end ;
+
+  printf ("Raspberry Pi PiFace Metronome\n") ;
+  printf ("=============================\n") ;
+
+  piHiPri (50) ;
+
+  wiringPiSetupSys () ;	// Needed for timing functions
+  piFaceSetup      (PIFACE) ;
+
+  if (argc != 2)
+  {
+    printf ("Usage: %s <beates per minute>\n", argv [0]) ;
+    exit (1) ;
+  }
+
+  if (strcmp (argv [1], "a") == 0)
+    middleA () ;
+
+  bpm = atoi (argv [1]) ;
+
+  if ((bpm < 40) || (bpm > 208))
+  {
+    printf ("%s range is 40 through 208 beats per minute\n", argv [0]) ;
+    exit (1) ;
+  }
+
+  msPerBeat = 60000 / bpm  ;
+
+// Main loop:
+//	Put some random LED pairs up for a few seconds, then blank ...
+
+  for (;;)
+  {
+    end = millis ()  + msPerBeat ;
+
+    digitalWrite (PIFACE + 0, state)  ;
+    digitalWrite (PIFACE + 1, state)  ;
+
+    while (millis () < end)
+      delayMicroseconds (500) ;
+
+    state ^= 1 ;
+  }
+
+  return 0 ;
+}

examples/PiFace/motor.c

@@ -0,0 +1,120 @@
+/*
+ * motor.c:
+ *	Use the PiFace board to demonstrate an H bridge
+ *	circuit via the 2 relays.
+ *	Then add on an external transsitor to help with PWM.
+ *
+ * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <wiringPi.h>
+#include <piFace.h>
+#include <softPwm.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+int outputs [2] = { 0,0 } ;
+
+#define	PIFACE_BASE	200
+#define PWM_OUT_PIN	204
+#define	PWM_UP		202
+#define	PWM_DOWN	203
+
+void scanButton (int button)
+{
+  if (digitalRead (PIFACE_BASE + button) == LOW)
+  {
+    outputs [button] ^= 1 ;
+    digitalWrite (PIFACE_BASE + button, outputs [button]) ;
+    printf ("Button %d pushed - output now: %s\n",
+		button, (outputs [button] == 0) ? "Off" : "On") ;
+  }
+
+  while (digitalRead (PIFACE_BASE + button) == LOW)
+    delay (1) ;
+}
+
+
+int main (void)
+{
+  int pin, button ;
+  int pwmValue = 0 ;
+
+  printf ("Raspberry Pi PiFace - Motor control\n") ;
+  printf ("==================================\n") ;
+  printf ("\n") ;
+  printf (
+"This program is designed to be used with a motor connected to the relays\n"
+"in an H-Bridge type configuration with optional speeed control via PWM.\n"
+"\n"
+"Use the leftmost buttons to turn each relay on and off, and the rigthmost\n"
+"buttons to increase ot decrease the PWM output on the control pin (pin\n"
+"4)\n\n") ;
+
+  wiringPiSetup () ;
+  piFaceSetup (PIFACE_BASE) ;
+  softPwmCreate (PWM_OUT_PIN, 100, 100) ;
+
+// Enable internal pull-ups & start with all off
+
+  for (pin = 0 ; pin < 8 ; ++pin)
+  {
+    pullUpDnControl (PIFACE_BASE + pin, PUD_UP) ;
+    digitalWrite    (PIFACE_BASE + pin, 0) ;
+  }
+
+  for (;;)
+  {
+    for (button = 0 ; button < 2 ; ++button)
+      scanButton (button) ;
+
+    if (digitalRead (PWM_UP) == LOW)
+    {
+      pwmValue += 10 ;
+      if (pwmValue > 100)
+	pwmValue = 100 ;
+
+      softPwmWrite (PWM_OUT_PIN, pwmValue) ;
+      printf ("PWM -> %3d\n", pwmValue) ;
+
+      while (digitalRead (PWM_UP) == LOW)
+	delay (5) ;
+    }
+
+    if (digitalRead (PWM_DOWN) == LOW)
+    {
+      pwmValue -= 10 ;
+      if (pwmValue < 0)
+	pwmValue = 0 ;
+
+      softPwmWrite (PWM_OUT_PIN, pwmValue) ;
+      printf ("PWM -> %3d\n", pwmValue) ;
+
+      while (digitalRead (PWM_DOWN) == LOW)
+	delay (5) ;
+    }
+
+    delay (5) ;
+  }
+
+  return 0 ;
+}

examples/PiFace/reaction.c

@@ -0,0 +1,194 @@
+/*
+ * reaction.c:
+ *	Simple test for the PiFace interface board.
+ *
+ * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+#include <wiringPi.h>
+#include <piFace.h>
+
+
+int outputs [4] = { 0,0,0,0 } ;
+
+#define	PIFACE	200
+
+/*
+ * light:
+ *	Light up the given LED - actually lights up a pair
+ *********************************************************************************
+ */
+
+void light (int led, int value)
+{
+  led *= 2 ;
+  digitalWrite (PIFACE + led + 0, value) ;
+  digitalWrite (PIFACE + led + 1, value) ;
+}
+
+/*
+ * lightAll:
+ *	All On or Off
+ *********************************************************************************
+ */
+
+void lightAll (int onoff)
+{
+  light (0, onoff) ;
+  light (1, onoff) ;
+  light (2, onoff) ;
+  light (3, onoff) ;
+}
+
+
+/*
+ * waitForNoButtons:
+ *	Wait for all buttons to be released
+ *********************************************************************************
+ */
+
+void waitForNoButtons (void)
+{
+  int i, button ;
+
+  for (;;)
+  {
+    button = 0 ;
+    for (i = 0 ; i < 4 ; ++i)
+      button += digitalRead (PIFACE + i) ;
+
+    if (button == 4)
+      break ;
+  }
+}
+
+
+void scanButton (int button)
+{
+  if (digitalRead (PIFACE + button) == LOW)
+  {
+    outputs [button] ^= 1 ;
+    digitalWrite (PIFACE + button, outputs [button]) ;
+  }
+
+  while (digitalRead (PIFACE + button) == LOW)
+    delay (1) ;
+}
+
+
+int main (void)
+{
+  int i, j ;
+  int led, button ;
+  unsigned int start, stop ;
+
+  printf ("Raspberry Pi PiFace Reaction Timer\n") ;
+  printf ("==================================\n") ;
+
+  if (piFaceSetup (PIFACE) == -1)
+    exit (1) ;
+
+// Enable internal pull-ups
+
+  for (i = 0 ; i < 8 ; ++i)
+    pullUpDnControl (PIFACE + i, PUD_UP) ;
+
+
+// Main game loop:
+//	Put some random LED pairs up for a few seconds, then blank ...
+
+  for (;;)
+  {
+    printf ("Press any button to start ... \n") ; fflush (stdout) ;
+
+    for (;;)
+    {
+      led = rand () % 4 ;
+      light (led, 1) ;
+      delay (10) ;
+      light (led, 0) ;
+
+      button = 0 ;
+      for (j = 0 ; j < 4 ; ++j)
+	button += digitalRead (PIFACE + j) ;
+
+      if (button != 4)
+	break ;
+    }
+
+    waitForNoButtons () ;
+
+    printf ("Wait for it ... ") ; fflush (stdout) ;
+
+    led = rand () % 4 ;
+    delay (rand () % 500 + 1000) ;
+    light (led, 1) ;
+
+    start = millis () ;
+    for (button = -1 ; button == -1 ; )
+    {
+      for (j = 0 ; j < 4 ; ++j)
+	if (digitalRead (PIFACE + j) == 0)	// Pushed
+	{
+	  button = j ;
+	  break ;
+	}
+    }
+    stop = millis () ;
+    button = 3 - button ; // Correct for the buttons/LEDs reversed
+
+    light (led, 0) ;
+
+    waitForNoButtons () ;
+
+    light (led, 1) ;
+
+    if (button == led)
+    {
+      printf ("You got it in %3d mS\n", stop - start) ;
+    }
+    else
+    {
+      printf ("Missed: You pushed %d - LED was %d\n", button, led) ;
+      for (;;)
+      {
+	light (button, 1) ;
+	delay (100) ;
+	light (button, 0) ;
+	delay (100) ;
+	i = 0 ;
+	for (j = 0 ; j < 4 ; ++j)
+	  i += digitalRead (PIFACE + j) ;
+	if (i != 4)
+	  break ;
+      }
+
+      waitForNoButtons () ;
+    }
+    light (led, 0) ;
+    delay (4000) ;
+  }
+
+  return 0 ;
+}

examples/blink.c

@@ -34,16 +34,14 @@ int main (void)
 {
   printf ("Raspberry Pi blink\n") ;
 
-  if (wiringPiSetup () == -1)
-    return 1 ;
-
+  wiringPiSetup () ;
   pinMode (LED, OUTPUT) ;
 
   for (;;)
   {
-    digitalWrite (LED, 1) ;	// On
+    digitalWrite (LED, HIGH) ;	// On
     delay (500) ;		// mS
-    digitalWrite (LED, 0) ;	// Off
+    digitalWrite (LED, LOW) ;	// Off
     delay (500) ;
   }
   return 0 ;

examples/test1.c → examples/blink12.c

@@ -1,8 +1,7 @@
 /*
- * test1.c:
- *	Simple test program to test the wiringPi functions
- *	This is a sequencer to make a patter appear on 8 LEDs
- *	connected to the GPIO pins.
+ * blink12.c:
+ *	Simple sequence over the first 12 GPIO pins - LEDs
+ *	Aimed at the Gertboard, but it's fairly generic.
  *
  * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
  ***********************************************************************
@@ -24,17 +23,13 @@
  ***********************************************************************
  */
 
-#include <wiringPi.h>
-
 #include <stdio.h>
-#include <stdlib.h>
-#include <stdint.h>
-
+#include <wiringPi.h>
 
 // Simple sequencer data
 //	Triplets of LED, On/Off and delay
 
-uint8_t data [] =
+int data [] =
 {
             0, 1, 1,
             1, 1, 1,
@@ -44,15 +39,23 @@ uint8_t data [] =
   3, 0, 0,  5, 1, 1,
   4, 0, 0,  6, 1, 1,
   5, 0, 0,  7, 1, 1,
-  6, 0, 1,
-  7, 0, 1,
+  6, 0, 0, 11, 1, 1,
+  7, 0, 0, 10, 1, 1,
+ 11, 0, 0, 13, 1, 1,
+ 10, 0, 0, 12, 1, 1,
+ 13, 0, 1,
+ 12, 0, 1,
 
   0, 0, 1,	// Extra delay
 
 // Back again
 
-            7, 1, 1,
-            6, 1, 1,
+           12, 1, 1,
+           13, 1, 1,
+ 12, 0, 0, 10, 1, 1,
+ 13, 0, 0, 11, 1, 1,
+ 10, 0, 0,  7, 1, 1,
+ 11, 0, 0,  6, 1, 1,
   7, 0, 0,  5, 1, 1,
   6, 0, 0,  4, 1, 1,
   5, 0, 0,  3, 1, 1,
@@ -64,7 +67,7 @@ uint8_t data [] =
 
   0, 0, 1,	// Extra delay
 
-  9, 9, 9,	// End marker
+  0, 9, 0,	// End marker
 
 } ;
 
@@ -75,16 +78,17 @@ int main (void)
   int dataPtr ;
   int l, s, d ;
 
-  printf ("Raspberry Pi wiringPi test program\n") ;
+  printf ("Raspberry Pi - 12-LED Sequence\n") ;
+  printf ("==============================\n") ;
+  printf ("\n") ;
+  printf ("Connect LEDs up to the first 8 GPIO pins, then pins 11, 10, 13, 12 in\n") ;
+  printf ("    that order, then sit back and watch the show!\n") ;
 
-  if (wiringPiSetup () == -1)
-    exit (1) ;
+  wiringPiSetup () ;
 
-  for (pin = 0 ; pin < 8 ; ++pin)
+  for (pin = 0 ; pin < 14 ; ++pin)
     pinMode (pin, OUTPUT) ;
 
-  pinMode (8, INPUT) ; 	// Pin 8 SDA0 - Has on-board 2k2 pull-up resistor
-
   dataPtr = 0 ;
 
   for (;;)
@@ -93,18 +97,14 @@ int main (void)
     s = data [dataPtr++] ;	// State
     d = data [dataPtr++] ;	// Duration (10ths)
 
-    if ((l + s + d) == 27)
+    if (s == 9)			// 9 -> End Marker
     {
       dataPtr = 0 ;
       continue ;
     }
 
     digitalWrite (l, s) ;
-
-    if (digitalRead (8) == 0)	// Pressed as our switch shorts to ground
-      delay (d * 10) ;	// Faster!
-    else
-      delay (d * 100) ;
+    delay        (d * 100) ;
   }
 
   return 0 ;

examples/test2.c → examples/blink8.c

@@ -1,6 +1,7 @@
 /*
- * test2.c:
- *	This tests the hardware PWM channel.
+ * blink8.c:
+ *	Simple sequence over the first 8 GPIO pins - LEDs
+ *	Aimed at the Gertboard, but it's fairly generic.
  *
  * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
  ***********************************************************************
@@ -22,37 +23,35 @@
  ***********************************************************************
  */
 
-#include <wiringPi.h>
-
 #include <stdio.h>
-#include <stdlib.h>
-#include <stdint.h>
+#include <wiringPi.h>
 
 int main (void)
 {
-  int bright ;
+  int i, led ;
 
-  printf ("Raspberry Pi wiringPi PWM test program\n") ;
+  printf ("Raspberry Pi - 8-LED Sequencer\n") ;
+  printf ("==============================\n") ;
+  printf ("\n") ;
+  printf ("Connect LEDs to the first 8 GPIO pins and watch ...\n") ;
 
-  if (wiringPiSetup () == -1)
-    exit (1) ;
+  wiringPiSetup () ;
 
-  pinMode (1, PWM_OUTPUT) ;
+  for (i = 0 ; i < 8 ; ++i)
+    pinMode (i, OUTPUT) ;
 
   for (;;)
   {
-    for (bright = 0 ; bright < 1024 ; ++bright)
+    for (led = 0 ; led < 8 ; ++led)
     {
-      pwmWrite (1, bright) ;
-      delay (1) ;
+      digitalWrite (led, 1) ;
+      delay (100) ;
     }
 
-    for (bright = 1023 ; bright >= 0 ; --bright)
+    for (led = 0 ; led < 8 ; ++led)
     {
-      pwmWrite (1, bright) ;
-      delay (1) ;
+      digitalWrite (led, 0) ;
+      delay (100) ;
     }
   }
-
-  return 0 ;
 }

examples/clock.c

@@ -0,0 +1,201 @@
+/*
+ * clock.c:
+ *	Demo of the 128x64 graphics based LCD driver.
+ *	This is designed to drive the parallel interface LCD drivers
+ *	based on the popular 12864H controller chip.
+ *
+ *	This test program assumes the following:
+ *		(Which is currently hard-wired into the driver)
+ *
+ *	GPIO 0-7 is connected to display data pins 0-7.
+ *	GPIO 10 is CS1
+ *	GPIO 11 is CS2
+ *	GPIO 12 is STROBE
+ *	GPIO 10 is RS
+ *
+ * Copyright (c) 2012-2013 Gordon Henderson.
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <time.h>
+#include <math.h>
+
+#include <wiringPi.h>
+#include <lcd128x64.h>
+
+#ifndef	TRUE
+#  define	TRUE	(1==1)
+#  define	FALSE	(1==2)
+#endif
+
+double clockRadius ;
+double thickness, barLen ;
+int maxX, maxY ;
+
+double rads (double degs)
+{
+  return degs * M_PI / 180.0 ;
+}
+
+void drawClockHands (void)
+{
+  time_t t ;
+  struct tm *now ;
+  double angle, p, x0, y0, x1, y1 ;
+  int h24, h, m, s ;
+  char text [20] ;
+
+  time (&t) ;
+  now = localtime (&t) ;
+
+  h24 = now->tm_hour ;
+  m   = now->tm_min ;
+  s   = now->tm_sec ;
+
+  h = h24 ;
+  if (h > 12)
+    h -= 12 ;
+
+// Hour hand
+
+  angle = h * 30 + m * 0.5 ;
+  x0 = sin (rads (angle)) * (clockRadius * 0.75) ;
+  y0 = cos (rads (angle)) * (clockRadius * 0.75) ;
+  for (p = -3.0 ; p <= 3.0 ; p += 0.2)
+  {
+    x1 = sin (rads (angle + p)) * (clockRadius * 0.7) ;
+    y1 = cos (rads (angle + p)) * (clockRadius * 0.7) ;
+    lcd128x64line (0, 0, x1, y1, 1) ;
+    lcd128x64lineTo (x0, y0, 1) ;
+  }
+
+// Minute hand
+
+  angle = m * 6 ;
+  x0 = sin (rads (angle)) * (clockRadius * 0.9) ;
+  y0 = cos (rads (angle)) * (clockRadius * 0.9) ;
+  for (p = -1.0 ; p <= 1.0 ; p += 0.2)
+  {
+    x1 = sin (rads (angle + p)) * (clockRadius * 0.85) ;
+    y1 = cos (rads (angle + p)) * (clockRadius * 0.85) ;
+    lcd128x64line (0, 0, x1, y1, 1) ;
+    lcd128x64lineTo (x0, y0, 1) ;
+  }
+
+// Second hand
+
+  angle = s * 6 ;
+  x0 = sin (rads (angle)) * (clockRadius * 0.2) ;
+  y0 = cos (rads (angle)) * (clockRadius * 0.2) ;
+  x1 = sin (rads (angle)) * (clockRadius * 0.95) ;
+  y1 = cos (rads (angle)) * (clockRadius * 0.95) ;
+  lcd128x64line (0 - x0, 0 - y0, x1, y1, 1) ;
+  lcd128x64circle (0, 0, clockRadius * 0.1,  0, 1) ;
+  lcd128x64circle (0, 0, clockRadius * 0.05, 1, 1) ;
+
+// Text:
+
+  sprintf (text, "%02d:%02d:%02d", h24, m, s) ;
+  lcd128x64puts (32, 24, text, 0, 1) ;
+
+  sprintf (text, "%2d/%2d/%2d", now->tm_mday, now->tm_mon + 1, now->tm_year - 100) ;
+  lcd128x64puts (32, -23, text, 0, 1) ;
+}
+
+void drawClockFace (void)
+{
+  int m ;
+  double d, px1, py1, px2, py2 ;
+
+  lcd128x64clear (0) ;
+  lcd128x64circle (0,0, clockRadius, 1, TRUE) ;
+  lcd128x64circle (0,0, clockRadius - thickness, 0, TRUE) ;
+
+// The four big indicators for 12,15,30 and 45
+
+  lcd128x64rectangle (- 3,  clockRadius - barLen, 3,  clockRadius,     1, TRUE) ;	// 12
+  lcd128x64rectangle (clockRadius - barLen, 3,  clockRadius, -3, 1, TRUE) ;	// 3
+  lcd128x64rectangle (- 3, -clockRadius + barLen, 3, -clockRadius, 1, TRUE) ;	// 6
+  lcd128x64rectangle (-clockRadius + barLen, 3, -clockRadius, -3, 1, TRUE) ;	// 9
+
+
+// Smaller 5 and 1 minute ticks
+
+  for (m = 0 ; m < 60 ; ++m)
+  {
+    px1 = sin (rads (m * 6)) * clockRadius ;
+    py1 = cos (rads (m * 6)) * clockRadius ;
+    if ((m % 5) == 0)
+      d = barLen ;
+    else 
+      d = barLen / 2.0 ;
+
+    px2 = sin (rads (m * 6)) * (clockRadius - d) ;
+    py2 = cos (rads (m * 6)) * (clockRadius - d) ;
+    lcd128x64line (px1, py1, px2, py2, 1) ;
+  }
+}
+
+void setup (void)
+{
+  lcd128x64getScreenSize (&maxX, &maxY) ;
+  clockRadius = maxY / 2 - 1 ;
+  thickness = maxX / 48 ;
+  barLen = thickness * 4 ;
+  lcd128x64setOrigin (32, 32) ;
+}
+
+
+
+
+/*
+ ***********************************************************************
+ * The main program
+ ***********************************************************************
+ */
+
+int main (int argc, char *argv [])
+{
+  time_t now ;
+
+  wiringPiSetup () ;
+
+  lcd128x64setup () ;
+
+  setup () ;
+  for (;;)
+  {
+    drawClockFace  () ;
+    drawClockHands () ;
+    lcd128x64update () ;
+
+    now = time (NULL) ;
+    while (time (NULL) == now)
+      delay (10) ;
+  }
+  
+
+  return 0 ;
+}

examples/ds1302.c

@@ -0,0 +1,238 @@
+/*
+ * ds1302.c:
+ *	Real Time clock
+ *
+ * Copyright (c) 2013 Gordon Henderson.
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <time.h>
+
+#include <wiringPi.h>
+#include <ds1302.h>
+
+// Register defines
+
+#define	RTC_SECS	 0
+#define	RTC_MINS	 1
+#define	RTC_HOURS	 2
+#define	RTC_DATE	 3
+#define	RTC_MONTH	 4
+#define	RTC_DAY		 5
+#define	RTC_YEAR	 6
+#define	RTC_WP		 7
+#define	RTC_TC		 8
+#define	RTC_BM		31
+
+
+static unsigned int masks [] = { 0x7F, 0x7F, 0x3F, 0x3F, 0x1F, 0x07, 0xFF } ;
+
+
+/*
+ * bcdToD: dToBCD:
+ *	BCD decode/encode
+ *********************************************************************************
+ */
+
+static int bcdToD (unsigned int byte, unsigned int mask)
+{
+  unsigned int b1, b2 ;
+  byte &= mask ;
+  b1 = byte & 0x0F ;
+  b2 = ((byte >> 4) & 0x0F) * 10 ;
+  return b1 + b2 ;
+}
+
+static unsigned int dToBcd (unsigned int byte)
+{
+  return ((byte / 10) << 4) + (byte % 10) ;
+}
+
+
+/*
+ * ramTest:
+ *	Simple test of the 31 bytes of RAM inside the DS1302 chip
+ *********************************************************************************
+ */
+
+static int ramTestValues [] =
+  { 0x00, 0xFF, 0xAA, 0x55, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x00, 0xF0, 0x0F, -1 } ;
+
+static int ramTest (void)
+{
+  int addr ;
+  int got ;
+  int i = 0 ;
+  int errors = 0 ;
+  int testVal ;
+
+  printf ("DS1302 RAM TEST\n") ;
+
+  testVal = ramTestValues [i] ;
+
+  while (testVal != -1)
+  {
+    for (addr = 0 ; addr < 31 ; ++addr)
+      ds1302ramWrite (addr, testVal) ;
+
+    for (addr = 0 ; addr < 31 ; ++addr)
+      if ((got = ds1302ramRead (addr)) != testVal)
+      {
+	printf ("DS1302 RAM Failure: Address: %2d, Expected: 0x%02X, Got: 0x%02X\n",
+		addr, testVal, got) ;
+	++errors ;
+      }
+    testVal = ramTestValues [++i] ;
+  }
+
+  for (addr = 0 ; addr < 31 ; ++addr)
+    ds1302ramWrite (addr, addr) ;
+
+  for (addr = 0 ; addr < 31 ; ++addr)
+    if ((got = ds1302ramRead (addr)) != addr)
+    {
+      printf ("DS1302 RAM Failure: Address: %2d, Expected: 0x%02X, Got: 0x%02X\n",
+	      addr, addr, got) ;
+      ++errors ;
+    }
+
+  if (errors == 0)
+    printf ("-- DS1302 RAM TEST: OK\n") ;
+  else
+    printf ("-- DS1302 RAM TEST FAILURE. %d errors.\n", errors) ;
+
+  return 0 ;
+}
+
+/*
+ * setLinuxClock:
+ *	Set the Linux clock from the hardware
+ *********************************************************************************
+ */
+
+static int setLinuxClock (void)
+{
+  char dateTime [20] ;
+  char command [64] ;
+  int  clock [8] ;
+
+
+  printf ("Setting the Linux Clock from the DS1302... ") ; fflush (stdout) ;
+
+  ds1302clockRead (clock) ;
+
+// [MMDDhhmm[[CC]YY][.ss]]
+
+  sprintf (dateTime, "%02d%02d%02d%02d%02d%02d.%02d",
+	bcdToD (clock [RTC_MONTH], masks [RTC_MONTH]),
+	bcdToD (clock [RTC_DATE],  masks [RTC_DATE]),
+	bcdToD (clock [RTC_HOURS], masks [RTC_HOURS]),
+	bcdToD (clock [RTC_MINS],  masks [RTC_MINS]),
+	20,
+	bcdToD (clock [RTC_YEAR],  masks [RTC_YEAR]),
+	bcdToD (clock [RTC_SECS],  masks [RTC_SECS])) ;
+
+  sprintf (command, "/bin/date %s", dateTime) ;
+  system (command) ;
+
+  return 0 ;
+}
+
+
+/*
+ * setDSclock:
+ *	Set the DS1302 block from Linux time
+ *********************************************************************************
+ */
+
+static int setDSclock (void)
+{
+  struct tm t ;
+  time_t now ;
+  int clock [8] ;
+
+  printf ("Setting the clock in the DS1302 from Linux time... ") ;
+
+  now = time (NULL) ;
+  gmtime_r (&now, &t) ;
+
+  clock [ 0] = dToBcd (t.tm_sec) ;	// seconds
+  clock [ 1] = dToBcd (t.tm_min) ;	// mins
+  clock [ 2] = dToBcd (t.tm_hour) ;	// hours
+  clock [ 3] = dToBcd (t.tm_mday) ;	// date
+  clock [ 4] = dToBcd (t.tm_mon + 1) ;	// months 0-11 --> 1-12
+  clock [ 5] = dToBcd (t.tm_wday + 1) ;	// weekdays (sun 0)
+  clock [ 6] = dToBcd (t.tm_year - 100) ;       // years
+  clock [ 7] = 0 ;			// W-Protect off
+
+  ds1302clockWrite (clock) ;
+
+  printf ("OK\n") ;
+
+  return 0 ;
+}
+
+
+
+
+int main (int argc, char *argv [])
+{
+  int i ;
+  int clock [8] ;
+
+  wiringPiSetup () ;
+  ds1302setup   (0, 1, 2) ;
+
+  if (argc == 2)
+  {
+    /**/ if (strcmp (argv [1], "-slc") == 0)
+      return setLinuxClock () ;
+    else if (strcmp (argv [1], "-sdsc") == 0)
+      return setDSclock () ;
+    else if (strcmp (argv [1], "-rtest") == 0)
+      return ramTest () ;
+    else
+    {
+      printf ("Usage: ds1302 [-slc | -sdsc | -rtest]\n") ;
+      return EXIT_FAILURE ;
+    }
+  }
+
+  for (i = 0 ;; ++i)
+  {
+    printf ("%5d:  ", i) ;
+
+    ds1302clockRead (clock) ;
+    printf (" %2d:%02d:%02d",
+	bcdToD (clock [2], masks [2]), bcdToD (clock [1], masks [1]), bcdToD (clock [0], masks [0])) ;
+
+    printf (" %2d/%02d/%04d",
+	bcdToD (clock [3], masks [3]), bcdToD (clock [4], masks [4]), bcdToD (clock [6], masks [6]) + 2000) ;
+      
+    printf ("\n") ;
+
+    delay (200) ;
+  }
+ 
+  return 0 ;
+}

examples/isr.c

@@ -38,16 +38,11 @@
 #include <wiringPi.h>
 
 
-// What GPIO input are we using?
-//	This is a wiringPi pin number
-
-#define	BUTTON_PIN	0
-
 // globalCounter:
 //	Global variable to count interrupts
 //	Should be declared volatile to make sure the compiler doesn't cache it.
 
-static volatile int globalCounter = 0 ;
+static volatile int globalCounter [8] ;
 
 
 /*
@@ -55,10 +50,14 @@ static volatile int globalCounter = 0 ;
  *********************************************************************************
  */
 
-void myInterrupt (void)
-{
-  ++globalCounter ;
-}
+void myInterrupt0 (void) { ++globalCounter [0] ; }
+void myInterrupt1 (void) { ++globalCounter [1] ; }
+void myInterrupt2 (void) { ++globalCounter [2] ; }
+void myInterrupt3 (void) { ++globalCounter [3] ; }
+void myInterrupt4 (void) { ++globalCounter [4] ; }
+void myInterrupt5 (void) { ++globalCounter [5] ; }
+void myInterrupt6 (void) { ++globalCounter [6] ; }
+void myInterrupt7 (void) { ++globalCounter [7] ; }
 
 
 /*
@@ -69,30 +68,42 @@ void myInterrupt (void)
 
 int main (void)
 {
-  int myCounter = 0 ;
+  int gotOne, pin ;
+  int myCounter [8] ;
 
-  if (wiringPiSetup () < 0)
-  {
-    fprintf (stderr, "Unable to setup wiringPi: %s\n", strerror (errno)) ;
-    return 1 ;
-  }
+  for (pin = 0 ; pin < 8 ; ++pin) 
+    globalCounter [pin] = myCounter [pin] = 0 ;
 
-  if (wiringPiISR (BUTTON_PIN, INT_EDGE_FALLING, &myInterrupt) < 0)
-  {
-    fprintf (stderr, "Unable to setup ISR: %s\n", strerror (errno)) ;
-    return 1 ;
-  }
+  wiringPiSetup () ;
 
+  wiringPiISR (0, INT_EDGE_FALLING, &myInterrupt0) ;
+  wiringPiISR (1, INT_EDGE_FALLING, &myInterrupt1) ;
+  wiringPiISR (2, INT_EDGE_FALLING, &myInterrupt2) ;
+  wiringPiISR (3, INT_EDGE_FALLING, &myInterrupt3) ;
+  wiringPiISR (4, INT_EDGE_FALLING, &myInterrupt4) ;
+  wiringPiISR (5, INT_EDGE_FALLING, &myInterrupt5) ;
+  wiringPiISR (6, INT_EDGE_FALLING, &myInterrupt6) ;
+  wiringPiISR (7, INT_EDGE_FALLING, &myInterrupt7) ;
 
   for (;;)
   {
+    gotOne = 0 ;
     printf ("Waiting ... ") ; fflush (stdout) ;
 
-    while (myCounter == globalCounter)
-      delay (100) ;
-
-    printf (" Done. counter: %5d\n", globalCounter) ;
-    myCounter = globalCounter ;
+    for (;;)
+    {
+      for (pin = 0 ; pin < 8 ; ++pin)
+      {
+	if (globalCounter [pin] != myCounter [pin])
+	{
+	  printf (" Int on pin %d: Counter: %5d\n", pin, globalCounter [pin]) ;
+	  myCounter [pin] = globalCounter [pin] ;
+	  ++gotOne ;
+	}
+      }
+      if (gotOne != 0)
+	break ;
+    }
   }
 
   return 0 ;

examples/lcd.c

@@ -4,7 +4,19 @@
  *	This is designed to drive the parallel interface LCD drivers
  *	based in the Hitachi HD44780U controller and compatables.
  *
- * Copyright (c) 2012 Gordon Henderson.
+ *	This test program assumes the following:
+ *
+ *	8-bit displays:
+ *		GPIO 0-7 is connected to display data pins 0-7.
+ *		GPIO 11 is the RS pin.
+ *		GPIO 10 is the Strobe/E pin.
+ *
+ *	For 4-bit interface:
+ *		GPIO 4-7 is connected to display data pins 4-7.
+ *		GPIO 11 is the RS pin.
+ *		GPIO 10 is the Strobe/E pin.
+ *
+ * Copyright (c) 2012-2013 Gordon Henderson.
  ***********************************************************************
  * This file is part of wiringPi:
  *	https://projects.drogon.net/raspberry-pi/wiringpi/
@@ -35,94 +47,208 @@
 #include <wiringPi.h>
 #include <lcd.h>
 
-int main (void)
+#ifndef	TRUE
+#  define	TRUE	(1==1)
+#  define	FALSE	(1==2)
+#endif
+
+static unsigned char newChar [8] = 
 {
-  int i, j ;
-  int fd1, fd2 ; 
+  0b11111,
+  0b10001,
+  0b10001,
+  0b10101,
+  0b11111,
+  0b10001,
+  0b10001,
+  0b11111,
+} ;
+
+
+int usage (const char *progName)
+{
+  fprintf (stderr, "Usage: %s bits cols rows\n", progName) ;
+  return EXIT_FAILURE ;
+}
+
+static const char *message =
+  "                    "
+  "Wiring Pi by Gordon Henderson. HTTP://WIRINGPI.COM/"
+  "                    " ;
+
+void scrollMessage (int lcd, int line, int width)
+{
+  char buf [32] ;
+  static int position = 0 ;
+
+  strncpy (buf, &message [position], width) ;
+  buf [width] = 0 ;
+  lcdPosition (lcd, 0, line) ;
+  lcdPuts (lcd, buf) ;
+
+  if (++position == (strlen (message) - width))
+    position = 0 ;
+}
+
+static void pingPong (int lcd, int cols)
+{
+  static int position = 0 ;
+  static int dir      = 0 ;
+
+  if (dir == 0)		// Setup
+  {
+    dir = 1 ;
+    lcdPosition (lcd, 0, 3) ;
+    lcdPutchar (lcd, '*') ;
+    return ;
+  }
 
-  char message1 [256] ;
-  char message2 [256] ;
-  char buf1 [30] ;
-  char buf2 [30] ;
+  lcdPosition (lcd, position, 3) ;
+  lcdPutchar (lcd, ' ') ;
+  position += dir ;
+
+  if (position == cols)
+  {
+    dir = -1 ;
+    --position ;
+  }
+  
+  if (position < 0)
+  {
+    dir = 1 ;
+    ++position ;
+  }
+
+  lcdPosition (lcd, position, 3) ;
+  lcdPutchar (lcd, '#') ;
+}
+
+
+
+static void waitForEnter (void)
+{
+  printf ("Press ENTER to continue: ") ;
+  (void)fgetc (stdin) ;
+}
+
+int main (int argc, char *argv[])
+{
+  int i ;
+  int lcd ;
+  int bits, rows, cols ;
 
   struct tm *t ;
   time_t tim ;
 
-  printf ("Raspberry Pi LCD test program\n") ;
+  char buf [32] ;
 
-  if (wiringPiSetup () == -1)
-    exit (1) ;
+  if (argc != 4)
+    return usage (argv [0]) ;
 
-  fd1 = lcdInit (4, 20, 4, 8,  9, 4,5,6,7,0,0,0,0) ;
-  fd2 = lcdInit (2, 16, 4, 8, 10, 4,5,6,7,0,0,0,0) ;
+  printf ("Raspberry Pi LCD test\n") ;
+  printf ("=====================\n") ;
 
-//fd1 = lcdInit (4, 20, 8, 8,  9, 0,1,2,3,4,5,6,7) ;
-//fd2 = lcdInit (2, 16, 8, 8, 10, 0,1,2,3,4,5,6,7) ;
+  bits = atoi (argv [1]) ;
+  cols = atoi (argv [2]) ;
+  rows = atoi (argv [3]) ;
 
-  if (fd1 == -1)
+  if (!((rows == 1) || (rows == 2) || (rows == 4)))
   {
-    printf ("lcdInit 1 failed\n") ;
-    return 1 ;
+    fprintf (stderr, "%s: rows must be 1, 2 or 4\n", argv [0]) ;
+    return EXIT_FAILURE ;
   }
 
-  if (fd2 == -1)
+  if (!((cols == 16) || (cols == 20)))
   {
-    printf ("lcdInit 2 failed\n") ;
-    return 1 ;
+    fprintf (stderr, "%s: cols must be 16 or 20\n", argv [0]) ;
+    return EXIT_FAILURE ;
   }
 
-  sleep (1) ;
+  wiringPiSetup () ;
 
-  lcdPosition (fd1, 0, 0) ; lcdPuts (fd1, " Gordon Henderson") ;
-  lcdPosition (fd1, 0, 1) ; lcdPuts (fd1, "  --------------") ;
-/*
-  lcdPosition (fd1, 0, 2) ; lcdPuts (fd1, "   00:00:00") ;
-  lcdPosition (fd1, 0, 3) ; lcdPuts (fd1, "   DD:MM:YY") ;
-*/
+  if (bits == 4)
+    lcd = lcdInit (rows, cols, 4, 11,10, 4,5,6,7,0,0,0,0) ;
+  else
+    lcd = lcdInit (rows, cols, 8, 11,10, 0,1,2,3,4,5,6,7) ;
+
+  if (lcd < 0)
+  {
+    fprintf (stderr, "%s: lcdInit failed\n", argv [0]) ;
+    return -1 ;
+  }
+
+  lcdPosition (lcd, 0, 0) ; lcdPuts (lcd, "Gordon Henderson") ;
 
-  lcdPosition (fd2, 0, 0) ; lcdPuts (fd2, "Gordon Henderson") ;
-  lcdPosition (fd2, 0, 1) ; lcdPuts (fd2, "----------------") ;
+  if (rows > 1)
+  {
+    lcdPosition (lcd, 0, 1) ;
+    for (i = 0 ; i < (cols - 1) ; ++i)
+      lcdPutchar (lcd, '*') ;
+    lcdPutchar (lcd, '2') ;
+
+    if (rows == 4)
+    {
+      lcdPosition (lcd, 0, 2) ;
+      for (i = 0 ; i < ((cols - 1) / 2) ; ++i)
+        lcdPuts (lcd, "=-") ;
+      lcdPuts (lcd, "=3") ;
+
+      lcdPosition (lcd, 0, 3) ;
+      for (i = 0 ; i < ((cols - 1) / 2) ; ++i)
+        lcdPuts (lcd, "-=") ;
+      lcdPuts (lcd, "-4") ;
+    }
+  }
 
   sleep (2) ;
 
-  sprintf (message1, "%s", "                  http://projects.drogon.net/                    ") ;
-  sprintf (message2, "%s", "                This is a long message to go into the smaller display just for a demonstration of what we can do.                ") ;
+  lcdPosition (lcd, 0, 0) ; lcdPuts (lcd, "  wiringpi.com  ") ;
+
+
+  waitForEnter () ;
+
+  lcdCharDef  (lcd, 2, newChar) ;
+
+  lcdClear    (lcd) ;
+  lcdPosition (lcd, 0, 0) ;
+  lcdPuts     (lcd, "User Char: ") ;
+  lcdPutchar  (lcd, 2) ;
+
+  lcdCursor      (lcd, TRUE) ;
+  lcdCursorBlink (lcd, TRUE) ;
+
+  waitForEnter () ;
+
+  lcdCursor      (lcd, FALSE) ;
+  lcdCursorBlink (lcd, FALSE) ;
+
 
   for (;;)
   {
-    i = 0 ;
-    j = 0 ;
-    for (;;)
-    {
-      strncpy (buf1, &message1 [i], 20) ;
-      buf1 [20] = 0 ;
-      lcdPosition (fd1, 0, 1) ;
-      lcdPuts (fd1, buf1) ;
-      ++i ;
-      if (i == strlen (message1) - 20)
-	i = 0 ;
-
-      strncpy (buf2, &message2 [j], 16) ;
-      buf2 [16] = 0 ;
-      lcdPosition (fd2, 0, 1) ;
-      lcdPuts (fd2, buf2) ;
-      ++j ;
-      if (j == strlen (message2) - 16)
-	j = 0 ;
-
-      tim = time (NULL) ;
-      t = localtime (&tim) ;
-
-      sprintf (buf1, "%02d:%02d:%02d", t->tm_hour, t->tm_min, t->tm_sec) ;
-      lcdPosition (fd1, 5, 2) ;
-      lcdPuts (fd1, buf1) ;
-
-      sprintf (buf1, "%02d/%02d/%02d", t->tm_mday, t->tm_mon + 1, t->tm_year+1900) ;
-      lcdPosition (fd1, 4, 3) ;
-      lcdPuts (fd1, buf1) ;
-
-      delay (250) ;
-    }
+    delay (250) ;
+
+    scrollMessage (lcd, 0, cols) ;
+    
+    if (rows == 1)
+      continue ;
+
+    tim = time (NULL) ;
+    t = localtime (&tim) ;
+
+    sprintf (buf, "%02d:%02d:%02d", t->tm_hour, t->tm_min, t->tm_sec) ;
+
+    lcdPosition (lcd, (cols - 8) / 2, 1) ;
+    lcdPuts     (lcd, buf) ;
+
+    if (rows == 2)
+      continue ;
+
+    sprintf (buf, "%02d/%02d/%04d", t->tm_mday, t->tm_mon + 1, t->tm_year+1900) ;
+
+    lcdPosition (lcd, (cols - 10) / 2, 2) ;
+    lcdPuts     (lcd, buf) ;
+
+    pingPong (lcd, cols) ;
   }
 
   return 0 ;

examples/okLed.c

@@ -39,27 +39,26 @@
 #include <wiringPi.h>
 #include <softPwm.h>
 
+// The OK/Act LED is connected to BCM_GPIO pin 16
+
 #define OK_LED  16
 
 int main ()
 {
   int fd, i ;
 
+  wiringPiSetupGpio () ;
+
+// Change the trigger on the OK/Act LED to "none"
+
   if ((fd = open ("/sys/class/leds/led0/trigger", O_RDWR)) < 0)
   {
     fprintf (stderr, "Unable to change LED trigger: %s\n", strerror (errno)) ;
     return 1 ;
   }
-
   write (fd, "none\n", 5) ;
   close (fd) ;
 
-  if (wiringPiSetupGpio () < 0)
-  {
-    fprintf (stderr, "Unable to setup GPIO: %s\n", strerror (errno)) ;
-    return 1 ;
-  }
-
   softPwmCreate (OK_LED, 0, 100) ;
 
   for (;;)

examples/pwm.c

@@ -1,7 +1,6 @@
 /*
  * pwm.c:
- *	Test of the software PWM driver. Needs 12 LEDs connected
- *	to the Pi.
+ *	This tests the hardware PWM channel.
  *
  * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
  ***********************************************************************
@@ -23,71 +22,37 @@
  ***********************************************************************
  */
 
-#include <stdio.h>
-#include <errno.h>
-#include <string.h>
-
 #include <wiringPi.h>
-#include <softPwm.h>
-
-#define RANGE		100
-#define	NUM_LEDS	 12
-
-int ledMap [NUM_LEDS] = { 0, 1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13 } ;
 
-int values [NUM_LEDS] = { 0, 17, 32, 50, 67, 85, 100, 85, 67, 50, 32, 17 } ;
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
 
-int main ()
+int main (void)
 {
-  int i, j ;
-  char buf [80] ;
+  int bright ;
 
-  if (wiringPiSetup () == -1)
-  {
-    fprintf (stdout, "oops: %s\n", strerror (errno)) ;
-    return 1 ;
-  }
-
-  for (i = 0 ; i < NUM_LEDS ; ++i)
-  {
-    softPwmCreate (ledMap [i], 0, RANGE) ;
-    printf ("%3d, %3d, %3d\n", i, ledMap [i], values [i]) ;
-  }
+  printf ("Raspberry Pi wiringPi PWM test program\n") ;
 
-  fgets (buf, 80, stdin) ;
+  if (wiringPiSetup () == -1)
+    exit (1) ;
 
-// Bring all up one by one:
+  pinMode (1, PWM_OUTPUT) ;
 
-  for (i = 0 ; i < NUM_LEDS ; ++i)
-    for (j = 0 ; j <= 100 ; ++j)
+  for (;;)
+  {
+    for (bright = 0 ; bright < 1024 ; ++bright)
     {
-      softPwmWrite (ledMap [i], j) ;
-      delay (10) ;
+      pwmWrite (1, bright) ;
+      delay (1) ;
     }
 
-  fgets (buf, 80, stdin) ;
-
-// Down fast
-
-  for (i = 100 ; i > 0 ; --i)
-  {
-    for (j = 0 ; j < NUM_LEDS ; ++j)
-      softPwmWrite (ledMap [j], i) ;
-    delay (10) ;
+    for (bright = 1023 ; bright >= 0 ; --bright)
+    {
+      pwmWrite (1, bright) ;
+      delay (1) ;
+    }
   }
 
-  fgets (buf, 80, stdin) ;
-
-  for (;;)
-  {
-    for (i = 0 ; i < NUM_LEDS ; ++i)
-      softPwmWrite (ledMap [i], values [i]) ;
-
-    delay (50) ;
-
-    i = values [0] ;
-    for (j = 0 ; j < NUM_LEDS - 1 ; ++j)
-      values [j] = values [j + 1] ;
-    values [NUM_LEDS - 1] = i ;
-  }
+  return 0 ;
 }

examples/piface.c → examples/rht03.c

@@ -1,8 +1,6 @@
 /*
- * piFace.c:
- *	Simple test for the PiFace interface board.
- *
- *	Read the buttons and output the same to the LEDs
+ * rht03.c:
+ *	Driver for the MaxDetect series sensors
  *
  * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
  ***********************************************************************
@@ -24,47 +22,42 @@
  ***********************************************************************
  */
 
-#include <wiringPi.h>
-
 #include <stdio.h>
-#include <stdlib.h>
-#include <stdint.h>
 
-int outputs [4] = { 0,0,0,0 } ;
-
-void scanButton (int button)
-{
-  if (digitalRead (button) == LOW)
-  {
-    outputs [button] ^= 1 ;
-    digitalWrite (button, outputs [button]) ;
-  }
+#include <wiringPi.h>
+#include <maxdetect.h>
 
-  while (digitalRead (button) == LOW)
-    delay (1) ;
-}
+#define	RHT03_PIN	0
 
+/*
+ ***********************************************************************
+ * The main program
+ ***********************************************************************
+ */
 
 int main (void)
 {
-  int pin, button ;
-
-  printf ("Raspberry Pi wiringPiFace test program\n") ;
+  int temp, rh ;
+  int newTemp, newRh ;
 
-  if (wiringPiSetupPiFace () == -1)
-    exit (1) ;
-
-// Enable internal pull-ups
-
-  for (pin = 0 ; pin < 8 ; ++pin)
-    pullUpDnControl (pin, PUD_UP) ;
+  temp = rh = newTemp = newRh = 0 ;
 
+  wiringPiSetup () ;
+  piHiPri       (55) ;
 
   for (;;)
   {
-    for (button = 0 ; button < 4 ; ++button)
-      scanButton (button) ;
-    delay (1) ;
+    delay (100) ;
+
+    if (!readRHT03 (RHT03_PIN, &newTemp, &newRh))
+      continue ;
+
+    if ((temp != newTemp) || (rh != newRh))
+    {
+      temp = newTemp ;
+      rh   = newRh ;
+      printf ("Temp: %5.1f, RH: %5.1f%%\n", temp / 10.0, rh / 10.0) ;
+    }
   }
 
   return 0 ;

examples/softPwm.c

@@ -0,0 +1,89 @@
+/*
+ * softPwm.c:
+ *	Test of the software PWM driver. Needs 8 LEDs connected
+ *	to the Pi - e.g. Ladder board.
+ *
+ * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+
+#include <wiringPi.h>
+#include <softPwm.h>
+
+#define RANGE		100
+#define	NUM_LEDS	  8
+
+int ledMap [NUM_LEDS] = { 0, 1, 2, 3, 4, 5, 6, 7 } ;
+
+int values [NUM_LEDS] = { 0, 25, 50, 75, 100, 75, 50, 25 } ;
+
+int main ()
+{
+  int i, j ;
+  char buf [80] ;
+
+  wiringPiSetup ()  ;
+
+  for (i = 0 ; i < NUM_LEDS ; ++i)
+  {
+    softPwmCreate (ledMap [i], 0, RANGE) ;
+    printf ("%3d, %3d, %3d\n", i, ledMap [i], values [i]) ;
+  }
+
+  fgets (buf, 80, stdin) ;
+
+// Bring all up one by one:
+
+  for (i = 0 ; i < NUM_LEDS ; ++i)
+    for (j = 0 ; j <= 100 ; ++j)
+    {
+      softPwmWrite (ledMap [i], j) ;
+      delay (10) ;
+    }
+
+  fgets (buf, 80, stdin) ;
+
+// All Down
+
+  for (i = 100 ; i > 0 ; --i)
+  {
+    for (j = 0 ; j < NUM_LEDS ; ++j)
+      softPwmWrite (ledMap [j], i) ;
+    delay (10) ;
+  }
+
+  fgets (buf, 80, stdin) ;
+
+  for (;;)
+  {
+    for (i = 0 ; i < NUM_LEDS ; ++i)
+      softPwmWrite (ledMap [i], values [i]) ;
+
+    delay (50) ;
+
+    i = values [0] ;
+    for (j = 0 ; j < NUM_LEDS - 1 ; ++j)
+      values [j] = values [j + 1] ;
+    values [NUM_LEDS - 1] = i ;
+  }
+}

examples/tone.c → examples/softTone.c

@@ -1,5 +1,5 @@
 /*
- * tone.c:
+ * softTone.c:
  *	Test of the softTone module in wiringPi
  *	Plays a scale out on pin 3 - connect pizeo disc to pin 3 & 0v
  *
@@ -38,11 +38,7 @@ int main ()
 {
   int i ;
 
-  if (wiringPiSetup () == -1)
-  {
-    fprintf (stdout, "oops: %s\n", strerror (errno)) ;
-    return 1 ;
-  }
+  wiringPiSetup () ;
 
   softToneCreate (PIN) ;
 
@@ -55,5 +51,4 @@ int main ()
       delay (500) ;
     }
   }
-
 }

examples/speed.c

@@ -31,93 +31,65 @@
 
 #define	FAST_COUNT	10000000
 #define	SLOW_COUNT	 1000000
+#define	PASSES		       5
 
-
-int main (void)
+void speedTest (int pin, int maxCount)
 {
-  int i ;
-  uint32_t start, end, count, sum, perSec ;
-
-  printf ("Raspberry Pi wiringPi speed test program\n") ;
-
-// Start the standard way
-
-  if (wiringPiSetup () == -1)
-    exit (1) ;
-
-  printf ("Native wiringPi method: (%8d iterations)\n", FAST_COUNT) ;
-
-  pinMode (0, OUTPUT) ;
+  int count, sum, perSec, i ;
+  unsigned int start, end ;
 
   sum = 0 ;
-  for (i = 0 ; i < 3 ; ++i)
-  {
-    printf ("  Pass: %d: ", i) ;
-    fflush (stdout) ;
 
+  for (i = 0 ; i < PASSES ; ++i)
+  {
     start = millis () ;
-    for (count = 0 ; count < FAST_COUNT ; ++count)
-      digitalWrite (0, 1) ;
+    for (count = 0 ; count < maxCount ; ++count)
+      digitalWrite (pin, 1) ;
     end = millis () ;
-    printf (" %8dmS\n", end - start) ;
+    printf (" %6d", end - start) ;
+    fflush (stdout) ;
     sum += (end - start) ;
   }
-  digitalWrite (0, 0) ;
-  printf ("   Average: %8dmS", sum / 3) ;
-  perSec = (int)(double)FAST_COUNT / (double)((double)sum / 3.0) * 1000.0 ;
-  printf (": %6d/sec\n", perSec) ;
 
+  digitalWrite (pin, 0) ;
+  printf (". Av: %6dmS", sum / PASSES) ;
+  perSec = (int)(double)maxCount / (double)((double)sum / (double)PASSES) * 1000.0 ;
+  printf (": %7d/sec\n", perSec) ;
+}
 
-  printf ("Native GPIO method: (%8d iterations)\n", FAST_COUNT) ;
-
-  if (wiringPiSetupGpio () == -1)
-    exit (1) ;
 
-  pinMode (17, OUTPUT) ;
+int main (void)
+{
+  printf ("Raspberry Pi wiringPi GPIO speed test program\n") ;
+  printf ("=============================================\n") ;
 
-  sum = 0 ;
-  for (i = 0 ; i < 3 ; ++i)
-  {
-    printf ("  Pass: %d: ", i) ;
-    fflush (stdout) ;
+// Start the standard way
 
-    start = millis () ;
-    for (count = 0 ; count < 10000000 ; ++count)
-      digitalWrite (17, 1) ;
-    end = millis () ;
-    printf (" %8dmS\n", end - start) ;
-    sum += (end - start) ;
-  }
-  digitalWrite (17, 0) ;
-  printf ("   Average: %8dmS", sum / 3) ;
-  perSec = (int)(double)FAST_COUNT / (double)((double)sum / 3.0) * 1000.0 ;
-  printf (": %6d/sec\n", perSec) ;
+  printf ("\nNative wiringPi method: (%8d iterations)\n", FAST_COUNT) ;
+  wiringPiSetup () ;
+  pinMode (0, OUTPUT) ;
+  speedTest (0, FAST_COUNT) ;
 
+// GPIO
 
-// Switch to SYS mode:
+  printf ("\nNative GPIO method: (%8d iterations)\n", FAST_COUNT) ;
+  wiringPiSetupGpio () ;
+  pinMode (17, OUTPUT) ;
+  speedTest (17, FAST_COUNT) ;
 
-  if (wiringPiSetupSys () == -1)
-    exit (1) ;
+// Phys
 
-  printf ("/sys/class/gpio method: (%8d iterations)\n", SLOW_COUNT) ;
+  printf ("\nPhysical pin GPIO method: (%8d iterations)\n", FAST_COUNT) ;
+  wiringPiSetupPhys () ;
+  pinMode (11, OUTPUT) ;
+  speedTest (11, FAST_COUNT) ;
 
-  sum = 0 ;
-  for (i = 0 ; i < 3 ; ++i)
-  {
-    printf ("  Pass: %d: ", i) ;
-    fflush (stdout) ;
+// Switch to SYS mode:
 
-    start = millis () ;
-    for (count = 0 ; count < SLOW_COUNT ; ++count)
-      digitalWrite (17, 1) ;
-    end = millis () ;
-    printf (" %8dmS\n", end - start) ;
-    sum += (end - start) ;
-  }
-  digitalWrite (17, 0) ;
-  printf ("   Average: %8dmS", sum / 3) ;
-  perSec = (int)(double)SLOW_COUNT / (double)((double)sum / 3.0) * 1000.0 ;
-  printf (": %6d/sec\n", perSec) ;
+  system ("/usr/local/bin/gpio export 17 out") ;
+  printf ("\n/sys/class/gpio method: (%8d iterations)\n", SLOW_COUNT) ;
+  wiringPiSetupSys () ;
+  speedTest (17, SLOW_COUNT) ;
 
   return 0 ;
 }

gpio/Makefile

@@ -30,20 +30,20 @@ INCLUDE	= -I/usr/local/include
 CFLAGS	= $(DEBUG) -Wall $(INCLUDE) -Winline -pipe
 
 LDFLAGS	= -L/usr/local/lib
-LIBS    = -lwiringPi -lpthread -lm
+LIBS    = -lwiringPi -lwiringPiDev -lpthread -lm
 
 # May not need to  alter anything below this line
 ###############################################################################
 
-SRC	=	gpio.c
+SRC	=	gpio.c extensions.c
 
 OBJ	=	$(SRC:.c=.o)
 
 all:		gpio
 
-gpio:	gpio.o
+gpio:	$(OBJ)
 	@echo [Link]
-	@$(CC) -o $@ gpio.o $(LDFLAGS) $(LIBS)
+	@$(CC) -o $@ $(OBJ) $(LDFLAGS) $(LIBS)
 	
 .c.o:
 	@echo [Compile] $<
@@ -51,7 +51,8 @@ gpio:	gpio.o
 
 .PHONEY:	clean
 clean:
-	rm -f $(OBJ) gpio *~ core tags *.bak
+	@echo "[Clean]"
+	@rm -f $(OBJ) gpio *~ core tags *.bak
 
 .PHONEY:	tags
 tags:	$(SRC)
@@ -78,3 +79,6 @@ depend:
 	makedepend -Y $(SRC)
 
 # DO NOT DELETE
+
+gpio.o: extensions.h
+extensions.o: extensions.h

gpio/extensions.c

@@ -0,0 +1,329 @@
+/*
+ * extensions.c:
+ *	Part of the GPIO program to test, peek, poke and otherwise
+ *	noodle with the GPIO hardware on the Raspberry Pi.
+ *	Copyright (c) 2012-2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <ctype.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <fcntl.h>
+
+#include <wiringPi.h>
+
+#include <mcp23008.h>
+#include <mcp23017.h>
+#include <mcp23s08.h>
+#include <mcp23s17.h>
+#include <sr595.h>
+
+#include "extensions.h"
+
+extern int wiringPiDebug ;
+
+#ifndef TRUE
+#  define	TRUE	(1==1)
+#  define	FALSE	(1==2)
+#endif
+
+// Local structure to hold details
+
+struct extensionFunctionStruct
+{
+  const char *name ;
+  int	(*function)(char *progName, int pinBase, char *params) ;
+} ;
+
+
+/*
+ * extractInt:
+ *	Check & return an integer at the given location (prefixed by a :)
+ *********************************************************************************
+ */
+
+static char *extractInt (char *progName, char *p, int *num)
+{
+  if (*p != ':')
+  {
+    fprintf (stderr, "%s: colon expected\n", progName) ;
+    return NULL ;
+  }
+
+  ++p ;
+
+  if (!isdigit (*p))
+  {
+    fprintf (stderr, "%s: digit expected\n", progName) ;
+    return NULL ;
+  }
+
+  *num = strtol (p, NULL, 0) ;
+  while (isdigit (*p))
+    ++p ;
+
+  return p ;
+}
+
+
+
+/*
+ * doExtensionMcp23008:
+ *	MCP23008 - 8-bit I2C GPIO expansion chip
+ *	mcp23002:base:i2cAddr
+ *********************************************************************************
+ */
+
+static int doExtensionMcp23008 (char *progName, int pinBase, char *params)
+{
+  int i2c ;
+
+  if ((params = extractInt (progName, params, &i2c)) == NULL)
+    return FALSE ;
+
+  if ((i2c < 0x03) || (i2c > 0x77))
+  {
+    fprintf (stderr, "%s: i2c address (0x%X) out of range\n", progName, i2c) ;
+    return FALSE ;
+  }
+
+  mcp23008Setup (pinBase, i2c) ;
+
+  return TRUE ;
+}
+
+
+/*
+ * doExtensionMcp23017:
+ *	MCP23008 - 16-bit I2C GPIO expansion chip
+ *	mcp23002:base:i2cAddr
+ *********************************************************************************
+ */
+
+static int doExtensionMcp23017 (char *progName, int pinBase, char *params)
+{
+  int i2c ;
+
+  if ((params = extractInt (progName, params, &i2c)) == NULL)
+    return FALSE ;
+
+  if ((i2c < 0x03) || (i2c > 0x77))
+  {
+    fprintf (stderr, "%s: i2c address (0x%X) out of range\n", progName, i2c) ;
+    return FALSE ;
+  }
+
+  mcp23017Setup (pinBase, i2c) ;
+
+  return TRUE ;
+}
+
+
+/*
+ * doExtensionMcp23s08:
+ *	MCP23s08 - 8-bit SPI GPIO expansion chip
+ *	mcp23s08:base:spi:port
+ *********************************************************************************
+ */
+
+static int doExtensionMcp23s08 (char *progName, int pinBase, char *params)
+{
+  int spi, port ;
+
+  if ((params = extractInt (progName, params, &spi)) == NULL)
+    return FALSE ;
+
+  if ((spi < 0) || (spi > 1))
+  {
+    fprintf (stderr, "%s: SPI address (%d) out of range\n", progName, spi) ;
+    return FALSE ;
+  }
+
+  if ((params = extractInt (progName, params, &port)) == NULL)
+    return FALSE ;
+
+  if ((port < 0) || (port > 7))
+  {
+    fprintf (stderr, "%s: port address (%d) out of range\n", progName, port) ;
+    return FALSE ;
+  }
+
+  mcp23s08Setup (pinBase, spi, port) ;
+
+  return TRUE ;
+}
+
+
+/*
+ * doExtensionMcp23s17:
+ *	MCP23s17 - 16-bit SPI GPIO expansion chip
+ *	mcp23s17:base:spi:port
+ *********************************************************************************
+ */
+
+static int doExtensionMcp23s17 (char *progName, int pinBase, char *params)
+{
+  int spi, port ;
+
+  if ((params = extractInt (progName, params, &spi)) == NULL)
+    return FALSE ;
+
+  if ((spi < 0) || (spi > 1))
+  {
+    fprintf (stderr, "%s: SPI address (%d) out of range\n", progName, spi) ;
+    return FALSE ;
+  }
+
+  if ((params = extractInt (progName, params, &port)) == NULL)
+    return FALSE ;
+
+  if ((port < 0) || (port > 7))
+  {
+    fprintf (stderr, "%s: port address (%d) out of range\n", progName, port) ;
+    return FALSE ;
+  }
+
+  mcp23s17Setup (pinBase, spi, port) ;
+
+  return TRUE ;
+}
+
+/*
+ * doExtensionSr595:
+ *	Shift Register 74x595
+ *	sr595:base:pins:data:clock:latch
+ *********************************************************************************
+ */
+
+static int doExtensionSr595 (char *progName, int pinBase, char *params)
+{
+  int pins, data, clock, latch ;
+
+// Extract pins
+
+  if ((params = extractInt (progName, params, &pins)) == NULL)
+    return FALSE ;
+
+  if ((pins < 8) || (pins > 32))
+  {
+    fprintf (stderr, "%s: pin count (%d) out of range - 8-32 expected.\n", progName, pins) ;
+    return FALSE ;
+  }
+
+  if ((params = extractInt (progName, params, &data)) == NULL)
+    return FALSE ;
+
+  if ((params = extractInt (progName, params, &clock)) == NULL)
+    return FALSE ;
+
+  if ((params = extractInt (progName, params, &latch)) == NULL)
+    return FALSE ;
+
+  sr595Setup (pinBase, pins, data, clock, latch) ;
+
+  return TRUE ;
+}
+
+
+/*
+ * Function list
+ *********************************************************************************
+ */
+
+struct extensionFunctionStruct extensionFunctions [] = 
+{
+  { "mcp23008",		&doExtensionMcp23008 	},
+  { "mcp23017",		&doExtensionMcp23017 	},
+  { "mcp23s08",		&doExtensionMcp23s08 	},
+  { "mcp23s17",		&doExtensionMcp23s17 	},
+  { "sr595",		&doExtensionSr595	 },
+  { NULL,		NULL		 	},
+} ;
+
+
+/*
+ * doExtension:
+ *	Load in a wiringPi extension
+ *********************************************************************************
+ */
+
+int doExtension (char *progName, char *extensionData)
+{
+  char *p ;
+  char *extension = extensionData ;
+  struct extensionFunctionStruct *extensionFn ;
+  int pinBase = 0 ;
+
+// Get the extension extension name by finding the first colon
+
+  p = extension ;
+  while (*p != ':')
+  {
+    if (!*p)	// ran out of characters
+    {
+      fprintf (stderr, "%s: extension name not terminated by a colon\n", progName) ;
+      return FALSE ;
+    }
+    ++p ;
+  }
+
+  *p++ = 0 ;
+
+  if (!isdigit (*p))
+  {
+    fprintf (stderr, "%s: pinBase number expected after extension name\n", progName) ;
+    return FALSE ;
+  }
+
+  while (isdigit (*p))
+  {
+    if (pinBase > 1000000000)
+    {
+      fprintf (stderr, "%s: pinBase too large\n", progName) ;
+      return FALSE ;
+    }
+
+    pinBase = pinBase * 10 + (*p - '0') ;
+    ++p ;
+  }
+
+  if (pinBase < 64)
+  {
+    fprintf (stderr, "%s: pinBase (%d) too small. Minimum is 64.\n", progName, pinBase) ;
+    return FALSE ;
+  }
+
+// Search for extensions:
+
+  for (extensionFn = extensionFunctions ; extensionFn->name != NULL ; ++extensionFn)
+  {
+    if (strcmp (extensionFn->name, extension) == 0)
+      return extensionFn->function (progName, pinBase, p) ;
+  }
+
+  fprintf (stderr, "%s: extension %s not found\n", progName, extension) ;
+  return FALSE ;
+}

gpio/extensions.h

@@ -0,0 +1,26 @@
+/*
+ * extensions.h:
+ *	Part of the GPIO program to test, peek, poke and otherwise
+ *	noodle with the GPIO hardware on the Raspberry Pi.
+ *	Copyright (c) 2012-2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+
+extern int doExtension (char *progName, char *extensionData) ;

gpio/gpio.1

@@ -1,15 +1,19 @@
-.TH "GPIO" "21st October 2012" "Command-Line access to Raspberry Pi and PiFace GPIO"
+.TH "GPIO" "March 2013" "Command-Line access to Raspberry Pi's GPIO"
 
 .SH NAME
-gpio \- Command-line access to Raspberry Pi and PiFace GPIO
+gpio \- Command-line access to Raspberry Pi's GPIO
 
 .SH SYNOPSIS
 .B gpio
 .B \-v
 .PP
 .B gpio
-.B [ \-g ]
-.B read/write/wb/pwm/clock/mode ...
+.B [ \-g | \-1 ]
+.B mode/read/write/aread/awrite/wb/pwm/clock ...
+.PP
+.B gpio
+.B [ \-x extension:params ]
+.B mode/read/write/aread/awrite/pwm ...
 .PP
 .B gpio
 .B [ \-p ]
@@ -17,7 +21,7 @@ gpio \- Command-line access to Raspberry Pi and PiFace GPIO
 .B ...
 .PP
 .B gpio
-.B readall
+.B readall/reset
 .PP
 .B gpio
 .B unexportall/exports
@@ -27,6 +31,10 @@ gpio \- Command-line access to Raspberry Pi and PiFace GPIO
 .B ...
 .PP
 .B gpio
+.B wfi
+.B ...
+.PP
+.B gpio
 .B drive
 group value
 .PP
@@ -73,12 +81,28 @@ Output the current version including the board revision of the Raspberry Pi.
 .TP
 .B \-g
 Use the BCM_GPIO pins numbers rather than wiringPi pin numbers.
-\fINOTE:\fR The BCM_GPIO pin numbers are always used with the 
+\fINote:\fR The BCM_GPIO pin numbers are always used with the 
 export and edge commands.
 
 .TP
+.B \-1
+Use the physical pin numbers rather than wiringPi pin numbers.
+\fINote:\fR that this applies to the P1 connector only. It is not possible to
+use pins on the Revision 2 P5 connector this way, and as with \-g the
+BCM_GPIO pin numbers are always used with the export and edge commands.
+
+.TP
+.B \-x extension
+This causes the named extension to be initialised. Extensions
+comprise of a name (e.g. mcp23017) followed by a colon, then the
+pin-base, then more optional parameters depending on the extension type.
+See the web page on http://wiringpi.com/the-gpio-utility/
+
+.TP
 .B \-p
-Use the PiFace interface board and its corresponding pin numbers.
+Use the PiFace interface board and its corresponding pin numbers. The PiFace
+will always appear at pin number 200 in the gpio command. You can assign any
+pin numbers you like in your own programs though.
 
 .TP
 .B read <pin>
@@ -103,6 +127,11 @@ if the pin is in input mode, or the last value written if the pin is in output
 mode.
 
 .TP
+.B reset
+Resets the GPIO - As much as it's possible to do. All pins are set to input
+mode and all the internal pull-up/down resistors are disconnected (tristate mode).
+
+.TP
 .B pwm <pin> <value>
 Write a PWM value (0-1023) to the given pin. The pin needs to be put
 into PWM mode first.
@@ -158,6 +187,12 @@ requiring root/sudo.
 Un-Export a GPIO pin in the /sys/class/gpio directory.
 
 .TP
+.B wfi <pin> <mode>
+This set the given pin to the supplied interrupt mode: rising, falling
+or both then waits for the interrupt to happen. It's a non-busy wait,
+so does not consume and CPU while it's waiting.
+
+.TP
 .B drive
 group value
 
@@ -207,26 +242,26 @@ The board jumpers need to be in-place to do this operation.
 
 .PP
 .TS
-r r r l.
-WiringPi	GPIO-r1	GPIO-r2	Function
+c c c c l.
+WiringPi	GPIO-r1	GPIO-r2	P1-Phys	Function
 _
-0	17	17
-1	18	18	(PWM)
-2	21	27
-3	22	22
-4	23	23
-5	24	24
-6	25	25
-7	4	4
-8	0	2	I2C: SDA0
-9	1	3	I2C: SCL0
-10	8	8	SPI: CE0
-11	7	7	SPI: CE1
-12	10	10	SPI: MOSI
-13	9	9	SPI: MISO
-14	11	11	SPI: SCLK
-15	14	14	TxD
-16	15	16	RxD
+ 0	17	17	11	
+ 1	18	18	12	(PWM)
+ 2	21	27	13
+ 3	22	22	15
+ 4	23	23	16
+ 5	24	24	18
+ 6	25	25	22
+ 7	4	4	7
+ 8	0	2	3	I2C: SDA0
+ 9	1	3	5	I2C: SCL0
+10	8	8	24	SPI: CE0
+11	7	7	26	SPI: CE1
+12	10	10	19	SPI: MOSI
+13	9	9	21	SPI: MISO
+14	11	11	23	SPI: SCLK
+15	14	14	8	TxD
+16	15	16	10	RxD
 17	-	28
 18	-	29
 19	-	30
@@ -272,7 +307,7 @@ pin numbers.
 .LP
 WiringPi's home page
 .IP
-https://projects.drogon.net/raspberry-pi/wiringpi/
+http://wiringpi.com/
 
 .SH AUTHOR
 
@@ -284,7 +319,7 @@ Please report bugs to <projects@drogon.net>
 
 .SH COPYRIGHT
 
-Copyright (c) 2012 Gordon Henderson
+Copyright (c) 2012-2013 Gordon Henderson
 This is free software; see the source for copying conditions. There is NO
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 

gpio/gpio.c

@@ -2,7 +2,7 @@
  * gpio.c:
  *	Swiss-Army-Knife, Set-UID command-line interface to the Raspberry
  *	Pi's GPIO.
- *	Copyright (c) 2012 Gordon Henderson
+ *	Copyright (c) 2012-2013 Gordon Henderson
  ***********************************************************************
  * This file is part of wiringPi:
  *	https://projects.drogon.net/raspberry-pi/wiringpi/
@@ -26,14 +26,20 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>
+#include <ctype.h>
 #include <string.h>
 #include <unistd.h>
 #include <errno.h>
-#include <sys/types.h>
 #include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
 
 #include <wiringPi.h>
+
 #include <gertboard.h>
+#include <piFace.h>
+
+#include "extensions.h"
 
 extern int wiringPiDebug ;
 
@@ -42,22 +48,26 @@ extern int wiringPiDebug ;
 #  define	FALSE	(1==2)
 #endif
 
-#define	VERSION	"1.12"
+#define	VERSION		"2.02"
+#define	I2CDETECT	"/usr/sbin/i2cdetect"
 
 static int wpMode ;
 
 char *usage = "Usage: gpio -v\n"
               "       gpio -h\n"
-              "       gpio [-g] <read/write/wb/pwm/clock/mode> ...\n"
+              "       gpio [-g|-1] [-x extension:params] ...\n"
               "       gpio [-p] <read/write/wb> ...\n"
-	      "       gpio readall\n"
-	      "       gpio unexportall/exports ...\n"
+              "       gpio <read/write/aread/awritewb/pwm/clock/mode> ...\n"
+	      "       gpio readall/reset\n"
+	      "       gpio unexportall/exports\n"
 	      "       gpio export/edge/unexport ...\n"
+	      "       gpio wfi <pin> <mode>\n"
 	      "       gpio drive <group> <value>\n"
 	      "       gpio pwm-bal/pwm-ms \n"
 	      "       gpio pwmr <range> \n"
 	      "       gpio pwmc <divider> \n"
 	      "       gpio load spi/i2c\n"
+	      "       gpio i2cd/i2cdetect\n"
 	      "       gpio gbr <channel>\n"
 	      "       gpio gbw <channel> <value>" ;	// No trailing newline needed here.
 
@@ -196,6 +206,37 @@ static void doLoad (int argc, char *argv [])
 
 
 /*
+ * doI2Cdetect:
+ *	Run the i2cdetect command with the right runes for this Pi revision
+ *********************************************************************************
+ */
+
+static void doI2Cdetect (int argc, char *argv [])
+{
+  int port = piBoardRev () == 1 ? 0 : 1 ;
+  char command [128] ;
+  struct stat statBuf ;
+
+  if (stat (I2CDETECT, &statBuf) < 0)
+  {
+    fprintf (stderr, "%s: Unable to find i2cdetect command: %s\n", argv [0], strerror (errno)) ;
+    return ;
+  }
+
+  if (!moduleLoaded ("i2c_dev"))
+  {
+    fprintf (stderr, "%s: The I2C kernel module(s) are not loaded.\n", argv [0]) ;
+    return ;
+  }
+
+  sprintf (command, "%s -y %d", I2CDETECT, port) ;
+  if (system (command) < 0)
+    fprintf (stderr, "%s: Unable to run i2cdetect: %s\n", argv [0], strerror (errno)) ;
+
+}
+
+
+/*
  * doReadall:
  *	Read all the GPIO pins
  *********************************************************************************
@@ -215,27 +256,39 @@ static char *alts [] =
   "IN  ", "OUT ", "ALT5", "ALT4", "ALT0", "ALT1", "ALT2", "ALT3"
 } ;
 
+static int wpiToPhys [64] =
+{
+  11, 12, 13, 15, 16, 18, 22,  7,	//  0...7
+   3,  5,				//  8...9
+  24, 26, 19, 21, 23,			// 10..14
+   8, 10,				// 15..16
+   3,  4,  5,  6,			// 17..20
+             0,0,0,0,0,0,0,0,0,0,0,	// 20..31
+   0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,	// 32..47
+   0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,	// 47..63
+} ;
+
 static void doReadall (void)
 {
   int pin ;
 
-  printf ("+----------+------+--------+------+-------+\n") ;
-  printf ("| wiringPi | GPIO | Name   | Mode | Value |\n") ;
-  printf ("+----------+------+--------+------+-------+\n") ;
+  printf ("+----------+-Rev%d-+------+--------+------+-------+\n", piBoardRev ()) ;
+  printf ("| wiringPi | GPIO | Phys | Name   | Mode | Value |\n") ;
+  printf ("+----------+------+------+--------+------+-------+\n") ;
 
-  for (pin = 0 ; pin < 64 ; ++pin)
+  for (pin = 0 ; pin < 64 ; ++pin)	// Crude, but effective
   {
     if (wpiPinToGpio (pin) == -1)
       continue ;
 
-    printf ("| %6d   | %3d  | %s | %s | %s  |\n",
-	pin, wpiPinToGpio (pin),
+    printf ("| %6d   | %3d  | %3d  | %s | %s | %s  |\n",
+	pin, wpiPinToGpio (pin), wpiToPhys [pin],
 	pinNames [pin], 
 	alts [getAlt (pin)], 
 	digitalRead (pin) == HIGH ? "High" : "Low ") ;
   }
 
-  printf ("+----------+------+--------+------+-------+\n") ;
+  printf ("+----------+------+------+--------+------+-------+\n") ;
 }
 
 
@@ -252,9 +305,7 @@ static void doExports (int argc, char *argv [])
   char fName [128] ;
   char buf [16] ;
 
-// Rather crude, but who knows what others are up to...
-
-  for (first = 0, i = 0 ; i < 64 ; ++i)
+  for (first = 0, i = 0 ; i < 64 ; ++i)	// Crude, but effective
   {
 
 // Try to read the direction
@@ -387,6 +438,52 @@ void doExport (int argc, char *argv [])
 
 
 /*
+ * doWfi:
+ *	gpio wfi pin mode
+ *	Wait for Interrupt on a given pin.
+ *	Slight cheat here - it's easier to actually use ISR now (which calls
+ *	gpio to set the pin modes!) then we simply sleep, and expect the thread
+ *	to exit the program. Crude but effective.
+ *********************************************************************************
+ */
+
+static void wfi (void)
+  { exit (0) ; }
+
+void doWfi (int argc, char *argv [])
+{
+  int pin, mode ;
+
+  if (argc != 4)
+  {
+    fprintf (stderr, "Usage: %s wfi pin mode\n", argv [0]) ;
+    exit (1) ;
+  }
+
+  pin  = atoi (argv [2]) ;
+
+  /**/ if (strcasecmp (argv [3], "rising")  == 0) mode = INT_EDGE_RISING ;
+  else if (strcasecmp (argv [3], "falling") == 0) mode = INT_EDGE_FALLING ;
+  else if (strcasecmp (argv [3], "both")    == 0) mode = INT_EDGE_BOTH ;
+  else
+  {
+    fprintf (stderr, "%s: wfi: Invalid mode: %s. Should be rising, falling or both\n", argv [1], argv [3]) ;
+    exit (1) ;
+  }
+
+  if (wiringPiISR (pin, mode, &wfi) < 0)
+  {
+    fprintf (stderr, "%s: wfi: Unable to setup ISR: %s\n", argv [1], strerror (errno)) ;
+    exit (1) ;
+  }
+
+  for (;;)
+    delay (9999) ;
+}
+
+
+
+/*
  * doEdge:
  *	gpio edge pin mode
  *	Easy access to changing the edge trigger on a GPIO pin
@@ -499,7 +596,7 @@ void doUnexport (int argc, char *argv [])
  *********************************************************************************
  */
 
-void doUnexportall (int argc, char *argv [])
+void doUnexportall (char *progName)
 {
   FILE *fd ;
   int pin ;
@@ -508,7 +605,7 @@ void doUnexportall (int argc, char *argv [])
   {
     if ((fd = fopen ("/sys/class/gpio/unexport", "w")) == NULL)
     {
-      fprintf (stderr, "%s: Unable to open GPIO export interface\n", argv [0]) ;
+      fprintf (stderr, "%s: Unable to open GPIO export interface\n", progName) ;
       exit (1) ;
     }
     fprintf (fd, "%d\n", pin) ;
@@ -518,6 +615,30 @@ void doUnexportall (int argc, char *argv [])
 
 
 /*
+ * doReset:
+ *	Reset the GPIO pins - as much as we can do
+ *********************************************************************************
+ */
+
+static void doReset (char *progName)
+{
+  int pin ;
+
+  doUnexportall (progName) ;
+
+  for (pin = 0 ; pin < 64 ; ++pin)
+  {
+    if (wpiPinToGpio (pin) == -1)
+      continue ;
+
+    digitalWrite    (pin, LOW) ;
+    pinMode         (pin, INPUT) ;
+    pullUpDnControl (pin, PUD_OFF) ;
+  }
+}
+
+
+/*
  * doMode:
  *	gpio mode pin mode ...
  *********************************************************************************
@@ -536,9 +657,6 @@ void doMode (int argc, char *argv [])
 
   pin = atoi (argv [2]) ;
 
-  if ((wpMode == WPI_MODE_PINS) && ((pin < 0) || (pin >= NUM_PINS)))
-    return ;
-
   mode = argv [3] ;
 
   /**/ if (strcasecmp (mode, "in")     == 0) pinMode         (pin, INPUT) ;
@@ -604,7 +722,7 @@ static void doGbw (int argc, char *argv [])
 
   if (argc != 4)
   {
-    fprintf (stderr, "Usage: %s gbr <channel> <value>\n", argv [0]) ;
+    fprintf (stderr, "Usage: %s gbw <channel> <value>\n", argv [0]) ;
     exit (1) ;
   }
 
@@ -613,23 +731,23 @@ static void doGbw (int argc, char *argv [])
 
   if ((channel < 0) || (channel > 1))
   {
-    fprintf (stderr, "%s: channel must be 0 or 1\n", argv [0]) ;
+    fprintf (stderr, "%s: gbw: Channel number must be 0 or 1\n", argv [0]) ;
     exit (1) ;
   }
 
   if ((value < 0) || (value > 1023))
   {
-    fprintf (stderr, "%s: value must be from 0 to 255\n", argv [0]) ;
+    fprintf (stderr, "%s: gbw: Value must be from 0 to 255\n", argv [0]) ;
     exit (1) ;
   }
 
-  if (gertboardSPISetup () == -1)
+  if (gertboardAnalogSetup (64) < 0)
   {
     fprintf (stderr, "Unable to initialise the Gertboard SPI interface: %s\n", strerror (errno)) ;
     exit (1) ;
   }
 
-  gertboardAnalogWrite (channel, value) ;
+  analogWrite (64 + channel, value) ;
 }
 
 
@@ -654,21 +772,20 @@ static void doGbr (int argc, char *argv [])
 
   if ((channel < 0) || (channel > 1))
   {
-    fprintf (stderr, "%s: channel must be 0 or 1\n", argv [0]) ;
+    fprintf (stderr, "%s: gbr: Channel number must be 0 or 1\n", argv [0]) ;
     exit (1) ;
   }
 
-  if (gertboardSPISetup () == -1)
+  if (gertboardAnalogSetup (64) < 0)
   {
     fprintf (stderr, "Unable to initialise the Gertboard SPI interface: %s\n", strerror (errno)) ;
     exit (1) ;
   }
 
-  printf ("%d\n",gertboardAnalogRead (channel)) ;
+  printf ("%d\n", analogRead (64 + channel)) ;
 }
 
 
-
 /*
  * doWrite:
  *	gpio write pin value
@@ -687,9 +804,6 @@ static void doWrite (int argc, char *argv [])
 
   pin = atoi (argv [2]) ;
 
-  if ((wpMode == WPI_MODE_PINS) && ((pin < 0) || (pin >= NUM_PINS)))
-    return ;
-
   /**/ if ((strcasecmp (argv [3], "up") == 0) || (strcasecmp (argv [3], "on") == 0))
     val = 1 ;
   else if ((strcasecmp (argv [3], "down") == 0) || (strcasecmp (argv [3], "off") == 0))
@@ -703,6 +817,31 @@ static void doWrite (int argc, char *argv [])
     digitalWrite (pin, HIGH) ;
 }
 
+
+/*
+ * doAwriterite:
+ *	gpio awrite pin value
+ *********************************************************************************
+ */
+
+static void doAwrite (int argc, char *argv [])
+{
+  int pin, val ;
+
+  if (argc != 4)
+  {
+    fprintf (stderr, "Usage: %s awrite pin value\n", argv [0]) ;
+    exit (1) ;
+  }
+
+  pin = atoi (argv [2]) ;
+
+  val = atoi (argv [3]) ;
+
+  analogWrite (pin, val) ;
+}
+
+
 /*
  * doWriteByte:
  *	gpio write value
@@ -742,20 +881,58 @@ void doRead (int argc, char *argv [])
   }
 
   pin = atoi (argv [2]) ;
+  val = digitalRead (pin) ;
+
+  printf ("%s\n", val == 0 ? "0" : "1") ;
+}
+
+
+/*
+ * doAread:
+ *	Read an analog pin and return the value
+ *********************************************************************************
+ */
+
+void doAread (int argc, char *argv []) 
+{
+  int pin, val ;
 
-  if ((wpMode == WPI_MODE_PINS) && ((pin < 0) || (pin >= NUM_PINS)))
+  if (argc != 3)
   {
-    printf ("0\n") ;
-    return ;
+    fprintf (stderr, "Usage: %s aread pin\n", argv [0]) ;
+    exit (1) ;
   }
 
-  val = digitalRead (pin) ;
+  pin = atoi (argv [2]) ;
+
+  val = analogRead (pin) ;
 
   printf ("%s\n", val == 0 ? "0" : "1") ;
 }
 
 
 /*
+ * doToggle:
+ *	Toggle an IO pin
+ *********************************************************************************
+ */
+
+void doToggle (int argc, char *argv [])
+{
+  int pin ;
+
+  if (argc != 3)
+  {
+    fprintf (stderr, "Usage: %s toggle pin\n", argv [0]) ;
+    exit (1) ;
+  }
+
+  pin = atoi (argv [2]) ;
+
+  digitalWrite (pin, !digitalRead (pin)) ;
+}
+
+/*
  * doClock:
  *	Output a clock on a pin
  *********************************************************************************
@@ -773,9 +950,6 @@ void doClock (int argc, char *argv [])
 
   pin = atoi (argv [2]) ;
 
-  if ((wpMode == WPI_MODE_PINS) && ((pin < 0) || (pin >= NUM_PINS)))
-    return ;
-
   freq = atoi (argv [3]) ;
 
   gpioClockSet (pin, freq) ;
@@ -800,9 +974,6 @@ void doPwm (int argc, char *argv [])
 
   pin = atoi (argv [2]) ;
 
-  if ((wpMode == WPI_MODE_PINS) && ((pin < 0) || (pin >= NUM_PINS)))
-    return ;
-
   val = atoi (argv [3]) ;
 
   pwmWrite (pin, val) ;
@@ -885,16 +1056,34 @@ int main (int argc, char *argv [])
     return 1 ;
   }
 
+// Help
+
   if (strcasecmp (argv [1], "-h") == 0)
   {
     printf ("%s: %s\n", argv [0], usage) ;
     return 0 ;
   }
 
-  if (strcasecmp (argv [1], "-v") == 0)
+// Sort of a special:
+
+  if (strcmp (argv [1], "-R") == 0)
+  {
+    printf ("%d\n", piBoardRev ()) ;
+    return 0 ;
+  }
+
+// Version & Warranty
+
+  if (strcmp (argv [1], "-V") == 0)
+  {
+    printf ("%d\n", piBoardRev ()) ;
+    return 0 ;
+  }
+
+  if (strcmp (argv [1], "-v") == 0)
   {
     printf ("gpio version: %s\n", VERSION) ;
-    printf ("Copyright (c) 2012 Gordon Henderson\n") ;
+    printf ("Copyright (c) 2012-2013 Gordon Henderson\n") ;
     printf ("This is free software with ABSOLUTELY NO WARRANTY.\n") ;
     printf ("For details type: %s -warranty\n", argv [0]) ;
     printf ("\n") ;
@@ -905,7 +1094,7 @@ int main (int argc, char *argv [])
   if (strcasecmp (argv [1], "-warranty") == 0)
   {
     printf ("gpio version: %s\n", VERSION) ;
-    printf ("Copyright (c) 2012 Gordon Henderson\n") ;
+    printf ("Copyright (c) 2012-2013 Gordon Henderson\n") ;
     printf ("\n") ;
     printf ("    This program is free software; you can redistribute it and/or modify\n") ;
     printf ("    it under the terms of the GNU Leser General Public License as published\n") ;
@@ -934,8 +1123,8 @@ int main (int argc, char *argv [])
   /**/ if (strcasecmp (argv [1], "exports"    ) == 0)	{ doExports     (argc, argv) ;	return 0 ; }
   else if (strcasecmp (argv [1], "export"     ) == 0)	{ doExport      (argc, argv) ;	return 0 ; }
   else if (strcasecmp (argv [1], "edge"       ) == 0)	{ doEdge        (argc, argv) ;	return 0 ; }
-  else if (strcasecmp (argv [1], "unexportall") == 0)	{ doUnexportall (argc, argv) ;	return 0 ; }
   else if (strcasecmp (argv [1], "unexport"   ) == 0)	{ doUnexport    (argc, argv) ;	return 0 ; }
+  else if (strcasecmp (argv [1], "unexportall") == 0)	{ doUnexportall (argv [0]) ;	return 0 ; }
 
 // Check for load command:
 
@@ -948,13 +1137,9 @@ int main (int argc, char *argv [])
 
 // Check for -g argument
 
-  if (strcasecmp (argv [1], "-g") == 0)
+  /**/ if (strcasecmp (argv [1], "-g") == 0)
   {
-    if (wiringPiSetupGpio () == -1)
-    {
-      fprintf (stderr, "%s: Unable to initialise GPIO mode.\n", argv [0]) ;
-      exit (1) ;
-    }
+    wiringPiSetupGpio () ;
 
     for (i = 2 ; i < argc ; ++i)
       argv [i - 1] = argv [i] ;
@@ -962,15 +1147,23 @@ int main (int argc, char *argv [])
     wpMode = WPI_MODE_GPIO ;
   }
 
+// Check for -1 argument
+
+  else if (strcasecmp (argv [1], "-1") == 0)
+  {
+    wiringPiSetupPhys () ;
+
+    for (i = 2 ; i < argc ; ++i)
+      argv [i - 1] = argv [i] ;
+    --argc ;
+    wpMode = WPI_MODE_PHYS ;
+  }
+
 // Check for -p argument for PiFace
 
   else if (strcasecmp (argv [1], "-p") == 0)
   {
-    if (wiringPiSetupPiFaceForGpioProg () == -1)
-    {
-      fprintf (stderr, "%s: Unable to initialise PiFace.\n", argv [0]) ;
-      exit (1) ;
-    }
+    piFaceSetup (200) ;
 
     for (i = 2 ; i < argc ; ++i)
       argv [i - 1] = argv [i] ;
@@ -982,38 +1175,65 @@ int main (int argc, char *argv [])
 
   else
   {
-    if (wiringPiSetup () == -1)
-    {
-      fprintf (stderr, "%s: Unable to initialise wiringPi mode\n", argv [0]) ;
-      exit (1) ;
-    }
+    wiringPiSetup () ;
     wpMode = WPI_MODE_PINS ;
   }
 
-// Check for PWM or Pad Drive operations
+// Check for -x argument to load in a new extension
 
-  if (wpMode != WPI_MODE_PIFACE)
+  if (strcasecmp (argv [1], "-x") == 0)
   {
-    if (strcasecmp (argv [1], "pwm-bal") == 0)	{ doPwmMode  (PWM_MODE_BAL) ;	return 0 ; }
-    if (strcasecmp (argv [1], "pwm-ms")  == 0)	{ doPwmMode  (PWM_MODE_MS) ;	return 0 ; }
-    if (strcasecmp (argv [1], "pwmr")    == 0)	{ doPwmRange (argc, argv) ;	return 0 ; }
-    if (strcasecmp (argv [1], "pwmc")    == 0)	{ doPwmClock (argc, argv) ;	return 0 ; }
-    if (strcasecmp (argv [1], "drive")   == 0)	{ doPadDrive (argc, argv) ;	return 0 ; }
+    if (argc < 3)
+    {
+      fprintf (stderr, "%s: -x missing extension specification.\n", argv [0]) ;
+      exit (EXIT_FAILURE) ;
+    }
+
+    if (!doExtension (argv [0], argv [2]))	// Prints its own error messages
+      exit (EXIT_FAILURE) ;
+
+    for (i = 3 ; i < argc ; ++i)
+      argv [i - 2] = argv [i] ;
+    argc -= 2 ;
   }
 
-// Check for wiring commands
+  if (argc <= 1)
+  {
+    fprintf (stderr, "%s: no command given\n", argv [0]) ;
+    exit (EXIT_FAILURE) ;
+  }
 
-  /**/ if (strcasecmp (argv [1], "readall" ) == 0) doReadall   () ;
-  else if (strcasecmp (argv [1], "read" )    == 0) doRead      (argc, argv) ;
-  else if (strcasecmp (argv [1], "write")    == 0) doWrite     (argc, argv) ;
-  else if (strcasecmp (argv [1], "wb")       == 0) doWriteByte (argc, argv) ;
-  else if (strcasecmp (argv [1], "pwm"  )    == 0) doPwm       (argc, argv) ;
-  else if (strcasecmp (argv [1], "clock")    == 0) doClock     (argc, argv) ;
-  else if (strcasecmp (argv [1], "mode" )    == 0) doMode      (argc, argv) ;
+// Core wiringPi functions
+
+  /**/ if (strcasecmp (argv [1], "mode"   ) == 0) doMode      (argc, argv) ;
+  else if (strcasecmp (argv [1], "read"   ) == 0) doRead      (argc, argv) ;
+  else if (strcasecmp (argv [1], "write"  ) == 0) doWrite     (argc, argv) ;
+  else if (strcasecmp (argv [1], "pwm"    ) == 0) doPwm       (argc, argv) ;
+  else if (strcasecmp (argv [1], "awrite" ) == 0) doAwrite    (argc, argv) ;
+  else if (strcasecmp (argv [1], "aread"  ) == 0) doAread     (argc, argv) ;
+
+// GPIO Nicies
+
+  else if (strcasecmp (argv [1], "toggle" ) == 0) doToggle    (argc, argv) ;
+
+// Pi Specifics
+
+  else if (strcasecmp (argv [1], "pwm-bal"  ) == 0) doPwmMode   (PWM_MODE_BAL) ;
+  else if (strcasecmp (argv [1], "pwm-ms"   ) == 0) doPwmMode   (PWM_MODE_MS) ;
+  else if (strcasecmp (argv [1], "pwmr"     ) == 0) doPwmRange  (argc, argv) ;
+  else if (strcasecmp (argv [1], "pwmc"     ) == 0) doPwmClock  (argc, argv) ;
+  else if (strcasecmp (argv [1], "drive"    ) == 0) doPadDrive  (argc, argv) ;
+  else if (strcasecmp (argv [1], "readall"  ) == 0) doReadall   () ;
+  else if (strcasecmp (argv [1], "i2cdetect") == 0) doI2Cdetect (argc, argv) ;
+  else if (strcasecmp (argv [1], "i2cd"     ) == 0) doI2Cdetect (argc, argv) ;
+  else if (strcasecmp (argv [1], "reset"    ) == 0) doReset     (argv [0]) ;
+  else if (strcasecmp (argv [1], "wb"       ) == 0) doWriteByte (argc, argv) ;
+  else if (strcasecmp (argv [1], "clock"    ) == 0) doClock     (argc, argv) ;
+  else if (strcasecmp (argv [1], "wfi"      ) == 0) doWfi       (argc, argv) ;
   else
   {
     fprintf (stderr, "%s: Unknown command: %s.\n", argv [0], argv [1]) ;
-    exit (1) ;
+    exit (EXIT_FAILURE) ;
   }
   return 0 ;
 }

gpio/pintest

@@ -0,0 +1,193 @@
+#!/bin/bash
+#
+# pintest
+#	Test the Pi's GPIO port
+# Copyright (c) 2013 Gordon Henderson
+#################################################################################
+# This file is part of wiringPi:
+#	Wiring Compatable library for the Raspberry Pi
+#
+#    wiringPi is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Lesser General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    wiringPi is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU Lesser General Public License for more details.
+#
+#    You should have received a copy of the GNU Lesser General Public License
+#    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+#################################################################################
+
+
+# logErr pin, expected got
+################################################################################
+
+logErr ()
+{
+  if [ $errs = 0 ]; then
+    echo ""
+  fi
+  echo " --> Pin $1 failure. Expected $2, got $3"
+  let errs+=1
+}
+
+
+# printErrorCount
+################################################################################
+
+printErrCount()
+{
+  if [ $errs = 0 ]; then
+    echo "No faults detected."
+  elif [ $errs = 1 ]; then
+    echo "One fault detected."
+  else
+    echo "$errs faults detected"
+  fi
+}
+
+
+# testPins start end
+################################################################################
+
+testPins()
+{
+  start=$1
+    end=$2
+   errs=0
+
+  printf "%30s %2d:%2d: "  "$3" $1 $2
+
+# Set range to inputs
+
+  for i in `seq $start $end`; do
+    gpio mode $i in
+  done
+
+# Enable internal pull-ups and expect to read high
+
+  for i in `seq $start $end`; do
+    gpio mode $i up
+    if [ `gpio read $i` = 0 ]; then
+      logErr $i 1 0
+    fi
+  done
+
+# Enable internal pull-downs and expect to read low
+
+  for i in `seq $start $end`; do
+    gpio mode $i down
+    if [ `gpio read $i` = 1 ]; then
+      echo "Pin $i failure - expected 0, got 1"
+      let errs+=1
+    fi
+  done
+
+# Remove the internal pull up/downs
+
+  for i in `seq $start $end`; do
+    gpio mode $i tri
+  done
+
+  if [ $errs = 0 ]; then
+    echo " OK"
+  else
+    printErrCount
+  fi
+
+  let totErrs+=errs
+}
+
+
+intro()
+{
+  revision=`gpio -V`
+  cat <<EOF
+PinTest
+=======
+
+This is a simple utility to test the GPIO pins on your revision $revision
+Raspberry Pi.
+
+NOTE: All GPIO peripherals must be removed to perform this test. This
+  includes serial, I2C and SPI connections. You may get incorrect results
+  if something is connected and it interferes with the test.
+
+This test can only test the input side of things. It uses the internal
+pull-up and pull-down resistors to simulate inputs. It does not test
+the output drivers.
+
+You will need to reboot your Pi after this test if you wish to use the 
+serial port as it will be left in GPIO mode rather than serial mode.
+
+Please make sure everything is removed and press the ENTER key to continue,
+EOF
+
+  echo -n "or Control-C to abort... "
+  read a
+}
+
+
+# Start here
+################################################################################
+
+intro
+gpio unexportall
+gpio reset
+
+   errs=0
+totErrs=0
+
+echo ""
+
+# Main pins
+
+testPins 0 7 "The main 8 GPIO pins"
+
+# P5 pins, if a rev 2:
+
+if [ $revision = 2 ]; then
+  testPins 17 20 "The 4 pins on the P5 connector"
+fi
+
+# SPI
+
+testPins 10 14 "The 5 SPI pins"
+
+# Serial
+
+testPins 15 16 "The serial pins"
+
+# I2C - Needs somewhat different testing
+#	due to the on-board pull-up's
+
+echo -n "                  The I2C pins  8: 9: "
+errs=0
+gpio mode 8 in
+gpio mode 9 in
+
+if [ `gpio read 8` = 0 ]; then
+  echo "Pin 8 failure - expected 1, got 0"
+  let errs+=1
+fi
+
+if [ `gpio read 9` = 0 ]; then
+  echo "Pin 9 failure - expected 1, got 0"
+  let errs+=1
+fi
+
+if [ $errs = 0 ]; then
+  echo " OK"
+else
+  printErrCount
+fi
+
+echo ""
+if [ $totErrs != 0 ]; then
+  echo ""
+  echo "Faults detected! Output of 'readall':"
+  gpio readall
+fi

pins/Makefile

@@ -0,0 +1,18 @@
+
+SRC	=	pins.tex
+
+
+all:		${SRC}
+	@echo	Generating DVI
+	@latex  pins.tex
+
+pins.dvi:	pins.tex
+	@latex  pins.tex
+
+pdf:	pins.dvi
+	@dvipdf pins.dvi
+
+
+.PHONEY:	clean
+clean:
+	@rm -f *.dvi *.aux *.log *.ps *.toc *.bak *~

pins/pins.tex

@@ -0,0 +1,116 @@
+\documentclass[12pt,a4paper]{article}
+\parskip 1ex
+\parindent 0em
+\thispagestyle{empty}
+\pagestyle{plain}
+\pagenumbering{arabic}
+\setlength{\topmargin}{0pt}
+\setlength{\headheight}{0pt}
+\setlength{\headsep}{0pt}
+\setlength{\topskip}{0pt}
+\setlength{\textheight}{240mm}
+\setlength{\footskip}{5ex}
+\setlength{\oddsidemargin}{0pt}
+\setlength{\evensidemargin}{0pt}
+\setlength{\textwidth}{160mm}
+\usepackage[dvips]{graphics,color}
+\usepackage{helvet}
+\renewcommand{\familydefault}{\sfdefault}
+\begin{document}
+\begin{sffamily}
+\definecolor{rtb-black}{rgb}  {0.0, 0.0, 0.0}
+\definecolor{rtb-navy}{rgb}   {0.0, 0.0, 0.5}
+\definecolor{rtb-green}{rgb}  {0.0, 0.5, 0.0}
+\definecolor{rtb-teal}{rgb}   {0.0, 0.5, 0.5}
+\definecolor{rtb-maroon}{rgb} {0.5, 0.0, 0.0}
+\definecolor{rtb-purple}{rgb} {0.5, 0.0, 0.5}
+\definecolor{rtb-olive}{rgb}  {0.5, 0.5, 0.0}
+\definecolor{rtb-silver}{rgb} {0.7, 0.7, 0.7}
+\definecolor{rtb-grey}{rgb}   {0.5, 0.5, 0.5}
+\definecolor{rtb-blue}{rgb}   {0.0, 0.0, 1.0}
+\definecolor{rtb-lime}{rgb}   {0.0, 1.0, 0.0}
+\definecolor{rtb-aqua}{rgb}   {0.0, 1.0, 1.0}
+\definecolor{rtb-red}{rgb}    {1.0, 0.0, 0.0}
+\definecolor{rtb-fuchsia}{rgb}{1.0, 0.0, 1.0}
+\definecolor{rtb-yellow}{rgb} {1.0, 1.0, 0.0}
+\definecolor{rtb-white}{rgb}  {1.0, 1.0, 1.0}
+
+\begin{center}
+\bfseries{WiringPi: GPIO Pin Numbering Tables}\\
+\tt{http://wiringpi.com/}
+\end{center}
+
+\begin{center}
+\begin{tabular}{|c|c|c||p{8mm}|p{8mm}||c|c|c|c|}
+\hline
+\multicolumn{8}{|c|}{\bfseries{P1: The Main GPIO connector}}\\
+\hline
+\hline
+WiringPi Pin	& BCM GPIO	& Name	& \multicolumn{2}{|c||}{Header}	& Name	& BCM GPIO	& WiringPi Pin\\
+\hline
+\hline
+	& 			& \textcolor{rtb-red}{3.3v}	& \raggedleft{1} &  2 & \textcolor{rtb-maroon}{5v}	& 	& \\
+\hline
+8	& Rv1:0 - Rv2:2		& \textcolor{rtb-aqua}{SDA}	& \raggedleft{3} &  4 & \textcolor{rtb-maroon}{5v}	& 	& \\
+\hline
+9	& Rv1:1 - Rv2:3		& \textcolor{rtb-aqua}{SCL}	& \raggedleft{5} &  6 & \textcolor{rtb-black}{0v}	& 	& \\
+\hline
+7	& 4			& \textcolor{rtb-green}{GPIO7}	& \raggedleft{7} &  8 & \textcolor{rtb-yellow}{TxD}	& 14    & 15\\
+\hline
+	& 			& \textcolor{rtb-black}{0v}	& \raggedleft{9} & 10 & \textcolor{rtb-yellow}{RxD}	& 15	& 16\\
+\hline
+0	& 17			& \textcolor{rtb-green}{GPIO0}	& \raggedleft{11} & 12 & \textcolor{rtb-green}{GPIO1}	& 18	& 1\\
+\hline
+2	& Rv1:21 - Rv2:27	& \textcolor{rtb-green}{GPIO2}	& \raggedleft{13} & 14 & \textcolor{rtb-black}{0v}	& 	& \\
+\hline
+3	& 22			& \textcolor{rtb-green}{GPIO3}	& \raggedleft{15} & 16 & \textcolor{rtb-green}{GPIO4}	& 23	& 4\\
+\hline
+	& 			& \textcolor{rtb-red}{3.3v}	& \raggedleft{17} & 18 & \textcolor{rtb-green}{GPIO5}	& 24	& 5\\
+\hline
+12	& 10			& \textcolor{rtb-teal}{MOSI}	& \raggedleft{19} & 20 & \textcolor{rtb-black}{0v}	& 	& \\
+\hline
+13	& 9			& \textcolor{rtb-teal}{MISO}	& \raggedleft{21} & 22 & \textcolor{rtb-green}{GPIO6}	& 25	& 6\\
+\hline
+14	& 11			& \textcolor{rtb-teal}{SCLK}	& \raggedleft{23} & 24 & \textcolor{rtb-teal}{CE0}	& 8	& 10\\
+\hline
+	& 			& \textcolor{rtb-black}{0v}	& \raggedleft{25} & 26 & \textcolor{rtb-teal}{CE1}	& 7	& 11\\
+\hline
+\hline
+WiringPi Pin	& BCM GPIO	& Name	& \multicolumn{2}{|c||}{Header}	& Name	& BCM GPIO	& WiringPi Pin\\
+\hline
+\end{tabular}
+\end{center}
+
+Note the differences between Revision 1 and Revision 2 Raspberry
+Pi's. The Revision 2 is readily identifiable by the presence of the 2
+mounting holes.
+
+The revision 2 Raspberry Pi has an additional GPIO connector, P5, which is next to the main P1 GPIO
+connector:
+
+\begin{center}
+\begin{tabular}{|c|c|c||p{8mm}|p{8mm}||c|c|c|c|}
+\hline
+\multicolumn{8}{|c|}{\bfseries{P5: Secondary GPIO connector (Rev. 2 Pi only)}}\\
+\hline
+\hline
+WiringPi Pin	& BCM GPIO	& Name	& \multicolumn{2}{|c||}{Header}	& Name	& BCM GPIO	& WiringPi Pin\\
+\hline
+\hline
+	& 		& \textcolor{rtb-maroon}{5v}	& \raggedleft{1} &  2 & \textcolor{rtb-red}{3.3v}	& 	&	\\
+\hline
+17	& 28		& \textcolor{rtb-green}{GPIO8}	& \raggedleft{3} &  4 & \textcolor{rtb-green}{GPIO9}	& 29	& 18	\\
+\hline
+19	& 30		& \textcolor{rtb-green}{GPIO10}	& \raggedleft{5} &  6 & \textcolor{rtb-green}{GPIO11}	& 31	& 20	\\
+\hline
+	& 		& \textcolor{rtb-black}{0v}	& \raggedleft{7} &  8 & \textcolor{rtb-black}{0v}	& 	&	\\
+\hline
+\hline
+WiringPi Pin	& BCM GPIO	& Name	& \multicolumn{2}{|c||}{Header}	& Name	& BCM GPIO	& WiringPi Pin\\
+\hline
+\end{tabular}
+\end{center}
+
+
+\end{sffamily}
+\end{document}

wiringPi/Makefile

@@ -21,7 +21,7 @@
 #    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
 #################################################################################
 
-DYN_VERS_MAJ=1
+DYN_VERS_MAJ=2
 DYN_VERS_MIN=0
 
 VERSION=$(DYN_VERS_MAJ).$(DYN_VERS_MIN)
@@ -35,26 +35,25 @@ DYNAMIC=libwiringPi.so.$(VERSION)
 DEBUG	= -O2
 CC	= gcc
 INCLUDE	= -I.
-CFLAGS	= $(DEBUG) -Wall $(INCLUDE) -Winline -pipe -fPIC
+CFLAGS	= $(DEBUG) -Wformat=2 -Wall $(INCLUDE) -Winline -pipe -fPIC
 
 LIBS    =
 
 # Should not alter anything below this line
 ###############################################################################
 
-SRC	=	wiringPi.c wiringPiFace.c wiringSerial.c wiringShift.c	\
-		gertboard.c						\
-		piNes.c							\
-		lcd.c piHiPri.c piThread.c				\
-		wiringPiSPI.c 						\
-		softPwm.c softServo.c softTone.c
-
-SRC_I2C	=	wiringPiI2C.c
+SRC	=	wiringPi.c						\
+		wiringSerial.c wiringShift.c				\
+		piHiPri.c piThread.c					\
+		wiringPiSPI.c wiringPiI2C.c				\
+		softPwm.c softTone.c					\
+		mcp23s08.c mcp23008.c					\
+		mcp23s17.c mcp23017.c sr595.c pcf8574.c			\
+		mcp3002.c mcp4802.c mcp3422.c				\
+		drc.c
 
 OBJ	=	$(SRC:.c=.o)
 
-OBJ_I2C	=	$(SRC_I2C:.c=.o)
-
 all:		$(DYNAMIC)
 
 static:		$(STATIC)
@@ -67,11 +66,7 @@ $(STATIC):	$(OBJ)
 
 $(DYNAMIC):	$(OBJ)
 	@echo "[Link (Dynamic)]"
-	@$(CC) -shared -Wl,-soname,libwiringPi.so.1 -o libwiringPi.so.1.0 -lpthread $(OBJ)
-
-i2c:	$(OBJ) $(OBJ_I2C)
-	@echo "[Link (Dynamic + I2C)]"
-	@$(CC) -shared -Wl,-soname,libwiringPi.so.1 -o libwiringPi.so.1.0 -lpthread $(OBJ) $(OBJ_I2C)
+	@$(CC) -shared -Wl,-soname,libwiringPi.so -o libwiringPi.so.$(VERSION) -lpthread $(OBJ)
 
 .c.o:
 	@echo [Compile] $<
@@ -79,37 +74,48 @@ i2c:	$(OBJ) $(OBJ_I2C)
 
 .PHONEY:	clean
 clean:
-	rm -f $(OBJ) $(OBJ_I2C) *~ core tags Makefile.bak libwiringPi.*
+	@echo "[Clean]"
+	@rm -f $(OBJ) $(OBJ_I2C) *~ core tags Makefile.bak libwiringPi.*
 
 .PHONEY:	tags
 tags:	$(SRC)
 	@echo [ctags]
 	@ctags $(SRC)
 
-.PHONEY:	install
-install:	$(DYNAMIC)
-	@echo "[Install]"
-	@install -m 0755 -d			$(DESTDIR)$(PREFIX)/lib
+
+.PHONEY:	install-headers
+install-headers:
+	@echo "[Install Headers]"
 	@install -m 0755 -d			$(DESTDIR)$(PREFIX)/include
 	@install -m 0644 wiringPi.h		$(DESTDIR)$(PREFIX)/include
 	@install -m 0644 wiringSerial.h		$(DESTDIR)$(PREFIX)/include
 	@install -m 0644 wiringShift.h		$(DESTDIR)$(PREFIX)/include
-	@install -m 0644 gertboard.h		$(DESTDIR)$(PREFIX)/include
-	@install -m 0644 piNes.h		$(DESTDIR)$(PREFIX)/include
 	@install -m 0644 softPwm.h		$(DESTDIR)$(PREFIX)/include
-	@install -m 0644 softServo.h		$(DESTDIR)$(PREFIX)/include
 	@install -m 0644 softTone.h		$(DESTDIR)$(PREFIX)/include
-	@install -m 0644 lcd.h			$(DESTDIR)$(PREFIX)/include
 	@install -m 0644 wiringPiSPI.h		$(DESTDIR)$(PREFIX)/include
 	@install -m 0644 wiringPiI2C.h		$(DESTDIR)$(PREFIX)/include
-	@install -m 0755 libwiringPi.so.$(VERSION)		  $(DESTDIR)$(PREFIX)/lib
-	@ln -sf $(DESTDIR)$(PREFIX)/lib/libwiringPi.so.$(VERSION) $(DESTDIR)/lib/libwiringPi.so
-	@ln -sf $(DESTDIR)$(PREFIX)/lib/libwiringPi.so.$(VERSION) $(DESTDIR)/lib/libwiringPi.so.1
+	@install -m 0644 mcp23008.h		$(DESTDIR)$(PREFIX)/include
+	@install -m 0644 mcp23017.h		$(DESTDIR)$(PREFIX)/include
+	@install -m 0644 mcp23s08.h		$(DESTDIR)$(PREFIX)/include
+	@install -m 0644 mcp23s17.h		$(DESTDIR)$(PREFIX)/include
+	@install -m 0644 mcp3002.h		$(DESTDIR)$(PREFIX)/include
+	@install -m 0644 mcp4802.h		$(DESTDIR)$(PREFIX)/include
+	@install -m 0644 mcp3422.h		$(DESTDIR)$(PREFIX)/include
+	@install -m 0644 sr595.h		$(DESTDIR)$(PREFIX)/include
+	@install -m 0644 pcf8574.h		$(DESTDIR)$(PREFIX)/include
+
+.PHONEY:	install
+install:	$(DYNAMIC) install-headers
+	@echo "[Install Dynamic Lib]"
+	@install -m 0755 -d						$(DESTDIR)$(PREFIX)/lib
+	@install -m 0755 libwiringPi.so.$(VERSION)			$(DESTDIR)$(PREFIX)/lib/libwiringPi.so.$(VERSION)
+	@ln -sf $(DESTDIR)$(PREFIX)/lib/libwiringPi.so.$(VERSION)	$(DESTDIR)/lib/libwiringPi.so
 	@ldconfig
 
 .PHONEY:	install-static
-install-static:	$(STATIC)
-	@echo "[Install Static]"
+install-static:	$(STATIC) install-headers
+	@echo "[Install Static Lib]"
+	@install -m 0755 -d			$(DESTDIR)$(PREFIX)/lib
 	@install -m 0755 libwiringPi.a		$(DESTDIR)$(PREFIX)/lib
 
 .PHONEY:	uninstall
@@ -118,14 +124,19 @@ uninstall:
 	@rm -f $(DESTDIR)$(PREFIX)/include/wiringPi.h
 	@rm -f $(DESTDIR)$(PREFIX)/include/wiringSerial.h
 	@rm -f $(DESTDIR)$(PREFIX)/include/wiringShift.h
-	@rm -f $(DESTDIR)$(PREFIX)/include/gertboard.h
-	@rm -f $(DESTDIR)$(PREFIX)/include/piNes.h
 	@rm -f $(DESTDIR)$(PREFIX)/include/softPwm.h
-	@rm -f $(DESTDIR)$(PREFIX)/include/softServo.h
 	@rm -f $(DESTDIR)$(PREFIX)/include/softTone.h
-	@rm -f $(DESTDIR)$(PREFIX)/include/lcd.h
 	@rm -f $(DESTDIR)$(PREFIX)/include/wiringPiSPI.h
 	@rm -f $(DESTDIR)$(PREFIX)/include/wiringPiI2C.h
+	@rm -f $(DESTDIR)$(PREFIX)/include/mcp23008.h
+	@rm -f $(DESTDIR)$(PREFIX)/include/mcp23017.h
+	@rm -f $(DESTDIR)$(PREFIX)/include/mcp23s08.h
+	@rm -f $(DESTDIR)$(PREFIX)/include/mcp23s17.h
+	@rm -f $(DESTDIR)$(PREFIX)/include/mcp3002.h
+	@rm -f $(DESTDIR)$(PREFIX)/include/mcp4802.h
+	@rm -f $(DESTDIR)$(PREFIX)/include/mcp3422.h
+	@rm -f $(DESTDIR)$(PREFIX)/include/sr595.h
+	@rm -f $(DESTDIR)$(PREFIX)/include/pcf8574.h
 	@rm -f $(DESTDIR)$(PREFIX)/lib/libwiringPi.*
 	@ldconfig
 
@@ -137,16 +148,21 @@ depend:
 # DO NOT DELETE
 
 wiringPi.o: wiringPi.h
-wiringPiFace.o: wiringPi.h
 wiringSerial.o: wiringSerial.h
 wiringShift.o: wiringPi.h wiringShift.h
-gertboard.o: wiringPiSPI.h gertboard.h
-piNes.o: wiringPi.h piNes.h
-lcd.o: wiringPi.h lcd.h
 piHiPri.o: wiringPi.h
 piThread.o: wiringPi.h
-wiringPiSPI.o: wiringPiSPI.h
+wiringPiSPI.o: wiringPi.h wiringPiSPI.h
+wiringPiI2C.o: wiringPi.h wiringPiI2C.h
 softPwm.o: wiringPi.h softPwm.h
-softServo.o: wiringPi.h softServo.h
 softTone.o: wiringPi.h softTone.h
-wiringPiI2C.o: wiringPi.h wiringPiI2C.h
+mcp23s08.o: wiringPi.h wiringPiSPI.h mcp23x0817.h mcp23s08.h
+mcp23008.o: wiringPi.h wiringPiI2C.h mcp23x0817.h mcp23008.h
+mcp23s17.o: wiringPi.h wiringPiSPI.h mcp23x0817.h mcp23s17.h
+mcp23017.o: wiringPi.h wiringPiI2C.h mcp23x0817.h mcp23017.h
+sr595.o: wiringPi.h sr595.h
+pcf8574.o: wiringPi.h wiringPiI2C.h pcf8574.h
+mcp3002.o: wiringPi.h wiringPiSPI.h mcp3002.h
+mcp4802.o: wiringPi.h wiringPiSPI.h mcp4802.h
+mcp3422.o: wiringPi.h wiringPiI2C.h mcp3422.h
+drc.o: wiringPi.h wiringSerial.h drc.h

wiringPi/README

@@ -1,9 +0,0 @@
-
-WiringPi: An implementation of most of the Arduino Wiring
-	functions for the Raspberry Pi,
-	along with many more features and libraries to support
-	hardware, etc. on the Raspberry Pi
-
-Full details at:
-	https://projects.drogon.net/raspberry-pi/wiringpi/
-

wiringPi/drc.c

@@ -0,0 +1,203 @@
+/*
+ * drc.c:
+ *	Extend wiringPi with the DRC control protocll to Arduino
+ *	Copyright (c) 2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+#include <time.h>
+#include <string.h>
+#include <errno.h>
+
+#include "wiringPi.h"
+#include "wiringSerial.h"
+
+#include "drc.h"
+
+#ifndef	TRUE
+#  define	TRUE	(1==1)
+#  define	FALSE	(1==2)
+#endif
+
+
+/*
+ * myPinMode:
+ *	Change the pin mode on the remote DRC device
+ *********************************************************************************
+ */
+
+static void myPinMode (struct wiringPiNodeStruct *node, int pin, int mode)
+{
+  /**/ if (mode == OUTPUT)
+    serialPutchar (node->fd, 'o') ;       // Input
+  else if (mode == PWM_OUTPUT)
+    serialPutchar (node->fd, 'p') ;       // PWM
+  else
+    serialPutchar (node->fd, 'i') ;       // Default to input
+
+  serialPutchar (node->fd, pin - node->pinBase) ;
+}
+
+
+/*
+ * myPullUpDnControl:
+ *	ATmegas only have pull-up's on of off. No pull-downs.
+ *********************************************************************************
+ */
+
+static void myPullUpDnControl (struct wiringPiNodeStruct *node, int pin, int mode)
+{
+
+// Force pin into input mode
+
+  serialPutchar (node->fd, 'i' ) ;
+  serialPutchar (node->fd, pin) ;
+
+  /**/ if (mode == PUD_UP)
+  {
+    serialPutchar (node->fd, '1') ;
+    serialPutchar (node->fd, pin - node->pinBase) ;
+  }
+  else if (mode == PUD_OFF)
+  {
+    serialPutchar (node->fd, '0') ;
+    serialPutchar (node->fd, pin - node->pinBase) ;
+  }
+}
+
+
+/*
+ * myDigitalWrite:
+ *********************************************************************************
+ */
+
+static void myDigitalWrite (struct wiringPiNodeStruct *node, int pin, int value)
+{
+  serialPutchar (node->fd, value == 0 ? '0' : '1') ;
+  serialPutchar (node->fd, pin - node->pinBase) ;
+}
+
+
+/*
+ * myPwmWrite:
+ *********************************************************************************
+ */
+
+static void myPwmWrite (struct wiringPiNodeStruct *node, int pin, int value)
+{
+  serialPutchar (node->fd, 'v') ;
+  serialPutchar (node->fd, pin - node->pinBase) ;
+  serialPutchar (node->fd, value & 0xFF) ;
+}
+
+
+/*
+ * myAnalogRead:
+ *********************************************************************************
+ */
+
+static int myAnalogRead (struct wiringPiNodeStruct *node, int pin)
+{
+  int vHi, vLo ;
+
+  serialPutchar (node->fd, 'a') ;
+  serialPutchar (node->fd, pin - node->pinBase) ;
+  vHi = serialGetchar (node->fd) ;
+  vLo = serialGetchar (node->fd) ;
+
+  return (vHi << 8) | vLo ;
+}
+
+
+/*
+ * myDigitalRead:
+ *********************************************************************************
+ */
+
+static int myDigitalRead (struct wiringPiNodeStruct *node, int pin)
+{
+  serialPutchar (node->fd, 'r') ; // Send read command
+  serialPutchar (node->fd, pin - node->pinBase) ;
+  return (serialGetchar (node->fd) == '0') ? 0 : 1 ;
+}
+
+
+/*
+ * drcSetup:
+ *	Create a new instance of an DRC GPIO interface.
+ *	Could be a variable nunber of pins here - we might not know in advance
+ *	if it's an ATmega with 14 pins, or something with less or more!
+ *********************************************************************************
+ */
+
+int drcSetup (const int pinBase, const int numPins, const char *device)
+{
+  int fd ;
+  int ok, tries ;
+  time_t then ;
+  struct wiringPiNodeStruct *node ;
+
+  if ((fd = serialOpen (device, 115200)) < 0)
+    return wiringPiFailure (WPI_ALMOST, "Unable to open DRC device (%s): %s", device, strerror (errno)) ;
+
+  delay (10) ;	// May need longer if it's an Uno that reboots on the open...
+
+// Flush any pending input
+
+  while (serialDataAvail (fd))
+    (void)serialGetchar (fd) ;
+
+  ok = FALSE ;
+  for (tries = 1 ; tries < 5 ; ++tries)
+  {
+    serialPutchar (fd, '@') ;
+    then = time (NULL) + 2 ;
+    while (time (NULL) < then)
+      if (serialDataAvail (fd))
+      {
+        if (serialGetchar (fd) == '@')
+        {
+          ok = TRUE ;
+          break ;
+        }
+      }
+    if (ok)
+      break ;
+  }
+
+  if (!ok)
+  {
+    serialClose (fd) ;
+    return wiringPiFailure (WPI_FATAL, "Unable to communidate with DRC device") ;
+  }
+
+  node = wiringPiNewNode (pinBase, numPins) ;
+
+  node->fd              = fd ;
+  node->pinMode         = myPinMode ;
+  node->pullUpDnControl = myPullUpDnControl ;
+  node->analogRead      = myAnalogRead ;
+  node->digitalRead     = myDigitalRead ;
+  node->digitalWrite    = myDigitalWrite ;
+  node->pwmWrite        = myPwmWrite ;
+
+  return 0 ;
+}

wiringPi/drc.h

@@ -0,0 +1,34 @@
+/*
+ * drc.h:
+ *	Extend wiringPi with the DRC control protocll to Arduino
+ *	Copyright (c) 2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int drcSetup (const int pinBase, const int numPins, const char *device) ;
+
+
+#ifdef __cplusplus
+}
+#endif

wiringPi/mcp23008.c

@@ -0,0 +1,149 @@
+/*
+ * mcp23008.c:
+ *	Extend wiringPi with the MCP 23008 I2C GPIO expander chip
+ *	Copyright (c) 2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+#include <pthread.h>
+
+#include "wiringPi.h"
+#include "wiringPiI2C.h"
+#include "mcp23x0817.h"
+
+#include "mcp23008.h"
+
+
+/*
+ * myPinMode:
+ *********************************************************************************
+ */
+
+static void myPinMode (struct wiringPiNodeStruct *node, int pin, int mode)
+{
+  int mask, old, reg ;
+
+  reg  = MCP23x08_IODIR ;
+  mask = 1 << (pin - node->pinBase) ;
+  old  = wiringPiI2CReadReg8 (node->fd, reg) ;
+
+  if (mode == OUTPUT)
+    old &= (~mask) ;
+  else
+    old |=   mask ;
+
+  wiringPiI2CWriteReg8 (node->fd, reg, old) ;
+}
+
+
+/*
+ * myPullUpDnControl:
+ *********************************************************************************
+ */
+
+static void myPullUpDnControl (struct wiringPiNodeStruct *node, int pin, int mode)
+{
+  int mask, old, reg ;
+
+  reg  = MCP23x08_GPPU ;
+  mask = 1 << (pin - node->pinBase) ;
+
+  old  = wiringPiI2CReadReg8 (node->fd, reg) ;
+
+  if (mode == PUD_UP)
+    old |=   mask ;
+  else
+    old &= (~mask) ;
+
+  wiringPiI2CWriteReg8 (node->fd, reg, old) ;
+}
+
+
+/*
+ * myDigitalWrite:
+ *********************************************************************************
+ */
+
+static void myDigitalWrite (struct wiringPiNodeStruct *node, int pin, int value)
+{
+  int bit, old ;
+
+  bit  = 1 << ((pin - node->pinBase) & 7) ;
+
+  old = node->data2 ;
+  if (value == LOW)
+    old &= (~bit) ;
+  else
+    old |=   bit ;
+
+  wiringPiI2CWriteReg8 (node->fd, MCP23x08_GPIO, old) ;
+  node->data2 = old ;
+}
+
+
+/*
+ * myDigitalRead:
+ *********************************************************************************
+ */
+
+static int myDigitalRead (struct wiringPiNodeStruct *node, int pin)
+{
+  int mask, value ;
+
+  mask  = 1 << ((pin - node->pinBase) & 7) ;
+  value = wiringPiI2CReadReg8 (node->fd, MCP23x08_GPIO) ;
+
+  if ((value & mask) == 0)
+    return LOW ;
+  else 
+    return HIGH ;
+}
+
+
+/*
+ * mcp23008Setup:
+ *	Create a new instance of an MCP23008 I2C GPIO interface. We know it
+ *	has 8 pins, so all we need to know here is the I2C address and the
+ *	user-defined pin base.
+ *********************************************************************************
+ */
+
+int mcp23008Setup (const int pinBase, const int i2cAddress)
+{
+  int fd ;
+  struct wiringPiNodeStruct *node ;
+
+  if ((fd = wiringPiI2CSetup (i2cAddress)) < 0)
+    return fd ;
+
+  wiringPiI2CWriteReg8 (fd, MCP23x08_IOCON, IOCON_INIT) ;
+
+  node = wiringPiNewNode (pinBase, 8) ;
+
+  node->fd              = fd ;
+  node->pinMode         = myPinMode ;
+  node->pullUpDnControl = myPullUpDnControl ;
+  node->digitalRead     = myDigitalRead ;
+  node->digitalWrite    = myDigitalWrite ;
+  node->data2           = wiringPiI2CReadReg8 (fd, MCP23x08_OLAT) ;
+
+  return 0 ;
+}

wiringPi/mcp23008.h

@@ -0,0 +1,33 @@
+/*
+ * 23008.h:
+ *	Extend wiringPi with the MCP 23008 I2C GPIO expander chip
+ *	Copyright (c) 2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern int mcp23008Setup (const int pinBase, const int i2cAddress) ;
+
+#ifdef __cplusplus
+}
+#endif

wiringPi/mcp23017.c

@@ -0,0 +1,195 @@
+/*
+ * mcp23017.c:
+ *	Extend wiringPi with the MCP 23017 I2C GPIO expander chip
+ *	Copyright (c) 2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+#include <pthread.h>
+
+#include "wiringPi.h"
+#include "wiringPiI2C.h"
+#include "mcp23x0817.h"
+
+#include "mcp23017.h"
+
+
+/*
+ * myPinMode:
+ *********************************************************************************
+ */
+
+static void myPinMode (struct wiringPiNodeStruct *node, int pin, int mode)
+{
+  int mask, old, reg ;
+
+  pin -= node->pinBase ;
+
+  if (pin < 8)		// Bank A
+    reg  = MCP23x17_IODIRA ;
+  else
+  {
+    reg  = MCP23x17_IODIRB ;
+    pin &= 0x07 ;
+  }
+
+  mask = 1 << pin ;
+  old  = wiringPiI2CReadReg8 (node->fd, reg) ;
+
+  if (mode == OUTPUT)
+    old &= (~mask) ;
+  else
+    old |=   mask ;
+
+  wiringPiI2CWriteReg8 (node->fd, reg, old) ;
+}
+
+
+/*
+ * myPullUpDnControl:
+ *********************************************************************************
+ */
+
+static void myPullUpDnControl (struct wiringPiNodeStruct *node, int pin, int mode)
+{
+  int mask, old, reg ;
+
+  pin -= node->pinBase ;
+
+  if (pin < 8)		// Bank A
+    reg  = MCP23x17_GPPUA ;
+  else
+  {
+    reg  = MCP23x17_GPPUB ;
+    pin &= 0x07 ;
+  }
+
+  mask = 1 << pin ;
+  old  = wiringPiI2CReadReg8 (node->fd, reg) ;
+
+  if (mode == PUD_UP)
+    old |=   mask ;
+  else
+    old &= (~mask) ;
+
+  wiringPiI2CWriteReg8 (node->fd, reg, old) ;
+}
+
+
+/*
+ * myDigitalWrite:
+ *********************************************************************************
+ */
+
+static void myDigitalWrite (struct wiringPiNodeStruct *node, int pin, int value)
+{
+  int bit, old ;
+
+  pin -= node->pinBase ;	// Pin now 0-15
+
+  bit = 1 << (pin & 7) ;
+
+  if (pin < 8)			// Bank A
+  {
+    old = node->data2 ;
+
+    if (value == LOW)
+      old &= (~bit) ;
+    else
+      old |=   bit ;
+
+    wiringPiI2CWriteReg8 (node->fd, MCP23x17_GPIOA, old) ;
+    node->data2 = old ;
+  }
+  else				// Bank B
+  {
+    old = node->data3 ;
+
+    if (value == LOW)
+      old &= (~bit) ;
+    else
+      old |=   bit ;
+
+    wiringPiI2CWriteReg8 (node->fd, MCP23x17_GPIOB, old) ;
+    node->data3 = old ;
+  }
+}
+
+
+/*
+ * myDigitalRead:
+ *********************************************************************************
+ */
+
+static int myDigitalRead (struct wiringPiNodeStruct *node, int pin)
+{
+  int mask, value, gpio ;
+
+  pin -= node->pinBase ;
+
+  if (pin < 8)		// Bank A
+    gpio  = MCP23x17_GPIOA ;
+  else
+  {
+    gpio  = MCP23x17_GPIOB ;
+    pin  &= 0x07 ;
+  }
+
+  mask  = 1 << pin ;
+  value = wiringPiI2CReadReg8 (node->fd, gpio) ;
+
+  if ((value & mask) == 0)
+    return LOW ;
+  else 
+    return HIGH ;
+}
+
+
+/*
+ * mcp23017Setup:
+ *	Create a new instance of an MCP23017 I2C GPIO interface. We know it
+ *	has 16 pins, so all we need to know here is the I2C address and the
+ *	user-defined pin base.
+ *********************************************************************************
+ */
+
+int mcp23017Setup (const int pinBase, const int i2cAddress)
+{
+  int fd ;
+  struct wiringPiNodeStruct *node ;
+
+  if ((fd = wiringPiI2CSetup (i2cAddress)) < 0)
+    return fd ;
+
+  wiringPiI2CWriteReg8 (fd, MCP23x17_IOCON, IOCON_INIT) ;
+
+  node = wiringPiNewNode (pinBase, 16) ;
+
+  node->fd              = fd ;
+  node->pinMode         = myPinMode ;
+  node->pullUpDnControl = myPullUpDnControl ;
+  node->digitalRead     = myDigitalRead ;
+  node->digitalWrite    = myDigitalWrite ;
+  node->data2           = wiringPiI2CReadReg8 (fd, MCP23x17_OLATA) ;
+  node->data3           = wiringPiI2CReadReg8 (fd, MCP23x17_OLATB) ;
+
+  return 0 ;
+}

wiringPi/mcp23017.h

@@ -0,0 +1,33 @@
+/*
+ * 23017.h:
+ *	Extend wiringPi with the MCP 23017 I2C GPIO expander chip
+ *	Copyright (c) 2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern int mcp23017Setup (const int pinBase, const int i2cAddress) ;
+
+#ifdef __cplusplus
+}
+#endif

wiringPi/mcp23s08.c

@@ -0,0 +1,189 @@
+/*
+ * mcp23s08.c:
+ *	Extend wiringPi with the MCP 23s08 SPI GPIO expander chip
+ *	Copyright (c) 2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+
+#include "wiringPi.h"
+#include "wiringPiSPI.h"
+#include "mcp23x0817.h"
+
+#include "mcp23s08.h"
+
+#define	MCP_SPEED	4000000
+
+
+
+/*
+ * writeByte:
+ *	Write a byte to a register on the MCP23s08 on the SPI bus.
+ *********************************************************************************
+ */
+
+static void writeByte (uint8_t spiPort, uint8_t devId, uint8_t reg, uint8_t data)
+{
+  uint8_t spiData [4] ;
+
+  spiData [0] = CMD_WRITE | ((devId & 7) << 1) ;
+  spiData [1] = reg ;
+  spiData [2] = data ;
+
+  wiringPiSPIDataRW (spiPort, spiData, 3) ;
+}
+
+/*
+ * readByte:
+ *	Read a byte from a register on the MCP23s08 on the SPI bus.
+ *********************************************************************************
+ */
+
+static uint8_t readByte (uint8_t spiPort, uint8_t devId, uint8_t reg)
+{
+  uint8_t spiData [4] ;
+
+  spiData [0] = CMD_READ | ((devId & 7) << 1) ;
+  spiData [1] = reg ;
+
+  wiringPiSPIDataRW (spiPort, spiData, 3) ;
+
+  return spiData [2] ;
+}
+
+
+/*
+ * myPinMode:
+ *********************************************************************************
+ */
+
+static void myPinMode (struct wiringPiNodeStruct *node, int pin, int mode)
+{
+  int mask, old, reg ;
+
+  reg  = MCP23x08_IODIR ;
+  mask = 1 << (pin - node->pinBase) ;
+  old  = readByte (node->data0, node->data1, reg) ;
+
+  if (mode == OUTPUT)
+    old &= (~mask) ;
+  else
+    old |=   mask ;
+
+  writeByte (node->data0, node->data1, reg, old) ;
+}
+
+
+/*
+ * myPullUpDnControl:
+ *********************************************************************************
+ */
+
+static void myPullUpDnControl (struct wiringPiNodeStruct *node, int pin, int mode)
+{
+  int mask, old, reg ;
+
+  reg  = MCP23x08_GPPU ;
+  mask = 1 << (pin - node->pinBase) ;
+
+  old  = readByte (node->data0, node->data1, reg) ;
+
+  if (mode == PUD_UP)
+    old |=   mask ;
+  else
+    old &= (~mask) ;
+
+  writeByte (node->data0, node->data1, reg, old) ;
+}
+
+
+/*
+ * myDigitalWrite:
+ *********************************************************************************
+ */
+
+static void myDigitalWrite (struct wiringPiNodeStruct *node, int pin, int value)
+{
+  int bit, old ;
+
+  bit  = 1 << ((pin - node->pinBase) & 7) ;
+
+  old = node->data2 ;
+  if (value == LOW)
+    old &= (~bit) ;
+  else
+    old |=   bit ;
+
+  writeByte (node->data0, node->data1, MCP23x08_GPIO, old) ;
+  node->data2 = old ;
+}
+
+
+/*
+ * myDigitalRead:
+ *********************************************************************************
+ */
+
+static int myDigitalRead (struct wiringPiNodeStruct *node, int pin)
+{
+  int mask, value ;
+
+  mask  = 1 << ((pin - node->pinBase) & 7) ;
+  value = readByte (node->data0, node->data1, MCP23x08_GPIO) ;
+
+  if ((value & mask) == 0)
+    return LOW ;
+  else 
+    return HIGH ;
+}
+
+
+/*
+ * mcp23s08Setup:
+ *	Create a new instance of an MCP23s08 SPI GPIO interface. We know it
+ *	has 8 pins, so all we need to know here is the SPI address and the
+ *	user-defined pin base.
+ *********************************************************************************
+ */
+
+int mcp23s08Setup (const int pinBase, const int spiPort, const int devId)
+{
+  int    x ;
+  struct wiringPiNodeStruct *node ;
+
+  if ((x = wiringPiSPISetup (spiPort, MCP_SPEED)) < 0)
+    return x ;
+
+  writeByte (spiPort, devId, MCP23x08_IOCON, IOCON_INIT) ;
+
+  node = wiringPiNewNode (pinBase, 8) ;
+
+  node->data0           = spiPort ;
+  node->data1           = devId ;
+  node->pinMode         = myPinMode ;
+  node->pullUpDnControl = myPullUpDnControl ;
+  node->digitalRead     = myDigitalRead ;
+  node->digitalWrite    = myDigitalWrite ;
+  node->data2           = readByte (spiPort, devId, MCP23x08_OLAT) ;
+
+  return 0 ;
+}

wiringPi/mcp23s08.h

@@ -0,0 +1,33 @@
+/*
+ * 23s08.h:
+ *	Extend wiringPi with the MCP 23s08 SPI GPIO expander chip
+ *	Copyright (c) 2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern int mcp23s08Setup (const int pinBase, const int spiPort, const int devId) ;
+
+#ifdef __cplusplus
+}
+#endif

wiringPi/mcp23s17.c

@@ -0,0 +1,236 @@
+/*
+ * mcp23s17.c:
+ *	Extend wiringPi with the MCP 23s17 SPI GPIO expander chip
+ *	Copyright (c) 2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+
+#include "wiringPi.h"
+#include "wiringPiSPI.h"
+#include "mcp23x0817.h"
+
+#include "mcp23s17.h"
+
+#define	MCP_SPEED	4000000
+
+
+
+/*
+ * writeByte:
+ *	Write a byte to a register on the MCP23s17 on the SPI bus.
+ *********************************************************************************
+ */
+
+static void writeByte (uint8_t spiPort, uint8_t devId, uint8_t reg, uint8_t data)
+{
+  uint8_t spiData [4] ;
+
+  spiData [0] = CMD_WRITE | ((devId & 7) << 1) ;
+  spiData [1] = reg ;
+  spiData [2] = data ;
+
+  wiringPiSPIDataRW (spiPort, spiData, 3) ;
+}
+
+/*
+ * readByte:
+ *	Read a byte from a register on the MCP23s17 on the SPI bus.
+ *********************************************************************************
+ */
+
+static uint8_t readByte (uint8_t spiPort, uint8_t devId, uint8_t reg)
+{
+  uint8_t spiData [4] ;
+
+  spiData [0] = CMD_READ | ((devId & 7) << 1) ;
+  spiData [1] = reg ;
+
+  wiringPiSPIDataRW (spiPort, spiData, 3) ;
+
+  return spiData [2] ;
+}
+
+
+/*
+ * myPinMode:
+ *********************************************************************************
+ */
+
+static void myPinMode (struct wiringPiNodeStruct *node, int pin, int mode)
+{
+  int mask, old, reg ;
+
+  pin -= node->pinBase ;
+
+  if (pin < 8)		// Bank A
+    reg  = MCP23x17_IODIRA ;
+  else
+  {
+    reg  = MCP23x17_IODIRB ;
+    pin &= 0x07 ;
+  }
+
+  mask = 1 << pin ;
+  old  = readByte (node->data0, node->data1, reg) ;
+
+  if (mode == OUTPUT)
+    old &= (~mask) ;
+  else
+    old |=   mask ;
+
+  writeByte (node->data0, node->data1, reg, old) ;
+}
+
+
+/*
+ * myPullUpDnControl:
+ *********************************************************************************
+ */
+
+static void myPullUpDnControl (struct wiringPiNodeStruct *node, int pin, int mode)
+{
+  int mask, old, reg ;
+
+  pin -= node->pinBase ;
+
+  if (pin < 8)		// Bank A
+    reg  = MCP23x17_GPPUA ;
+  else
+  {
+    reg  = MCP23x17_GPPUB ;
+    pin &= 0x07 ;
+  }
+
+  mask = 1 << pin ;
+  old  = readByte (node->data0, node->data1, reg) ;
+
+  if (mode == PUD_UP)
+    old |=   mask ;
+  else
+    old &= (~mask) ;
+
+  writeByte (node->data0, node->data1, reg, old) ;
+}
+
+
+/*
+ * myDigitalWrite:
+ *********************************************************************************
+ */
+
+static void myDigitalWrite (struct wiringPiNodeStruct *node, int pin, int value)
+{
+  int bit, old ;
+
+  pin -= node->pinBase ;	// Pin now 0-15
+
+  bit = 1 << (pin & 7) ;
+
+  if (pin < 8)			// Bank A
+  {
+    old = node->data2 ;
+
+    if (value == LOW)
+      old &= (~bit) ;
+    else
+      old |=   bit ;
+
+    writeByte (node->data0, node->data1, MCP23x17_GPIOA, old) ;
+    node->data2 = old ;
+  }
+  else				// Bank B
+  {
+    old = node->data3 ;
+
+    if (value == LOW)
+      old &= (~bit) ;
+    else
+      old |=   bit ;
+
+    writeByte (node->data0, node->data1, MCP23x17_GPIOB, old) ;
+    node->data3 = old ;
+  }
+}
+
+
+/*
+ * myDigitalRead:
+ *********************************************************************************
+ */
+
+static int myDigitalRead (struct wiringPiNodeStruct *node, int pin)
+{
+  int mask, value, gpio ;
+
+  pin -= node->pinBase ;
+
+  if (pin < 8)		// Bank A
+    gpio  = MCP23x17_GPIOA ;
+  else
+  {
+    gpio  = MCP23x17_GPIOB ;
+    pin  &= 0x07 ;
+  }
+
+  mask  = 1 << pin ;
+  value = readByte (node->data0, node->data1, gpio) ;
+
+  if ((value & mask) == 0)
+    return LOW ;
+  else 
+    return HIGH ;
+}
+
+
+/*
+ * mcp23s17Setup:
+ *	Create a new instance of an MCP23s17 SPI GPIO interface. We know it
+ *	has 16 pins, so all we need to know here is the SPI address and the
+ *	user-defined pin base.
+ *********************************************************************************
+ */
+
+int mcp23s17Setup (const int pinBase, const int spiPort, const int devId)
+{
+  int    x ;
+  struct wiringPiNodeStruct *node ;
+
+  if ((x = wiringPiSPISetup (spiPort, MCP_SPEED)) < 0)
+    return x ;
+
+  writeByte (spiPort, devId, MCP23x17_IOCON,  IOCON_INIT | IOCON_HAEN) ;
+  writeByte (spiPort, devId, MCP23x17_IOCONB, IOCON_INIT | IOCON_HAEN) ;
+
+  node = wiringPiNewNode (pinBase, 16) ;
+
+  node->data0           = spiPort ;
+  node->data1           = devId ;
+  node->pinMode         = myPinMode ;
+  node->pullUpDnControl = myPullUpDnControl ;
+  node->digitalRead     = myDigitalRead ;
+  node->digitalWrite    = myDigitalWrite ;
+  node->data2           = readByte (spiPort, devId, MCP23x17_OLATA) ;
+  node->data3           = readByte (spiPort, devId, MCP23x17_OLATB) ;
+
+  return 0 ;
+}

wiringPi/mcp23s17.h

@@ -0,0 +1,33 @@
+/*
+ * 23s17.h:
+ *	Extend wiringPi with the MCP 23s17 SPI GPIO expander chip
+ *	Copyright (c) 2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern int mcp23s17Setup (int pinBase, int spiPort, int devId) ;
+
+#ifdef __cplusplus
+}
+#endif

wiringPi/mcp23x08.h

@@ -0,0 +1,73 @@
+/*
+ * mcp23x17:
+ *	Copyright (c) 2012-2013 Gordon Henderson
+ *
+ *	Header file for code using the MCP23x17 GPIO expander chip.
+ *	This comes in 2 flavours: MCP23017 which has an I2C interface,
+ *	an the MXP23S17 which has an SPI interface.
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+
+// MCP23x17 Registers
+
+#define	IODIRA		0x00
+#define	IPOLA		0x02
+#define	GPINTENA	0x04
+#define	DEFVALA		0x06
+#define	INTCONA		0x08
+#define	IOCON		0x0A
+#define	GPPUA		0x0C
+#define	INTFA		0x0E
+#define	INTCAPA		0x10
+#define	GPIOA		0x12
+#define	OLATA		0x14
+
+#define	IODIRB		0x01
+#define	IPOLB		0x03
+#define	GPINTENB	0x05
+#define	DEFVALB		0x07
+#define	INTCONB		0x09
+#define	IOCONB		0x0B
+#define	GPPUB		0x0D
+#define	INTFB		0x0F
+#define	INTCAPB		0x11
+#define	GPIOB		0x13
+#define	OLATB		0x15
+
+// Bits in the IOCON register
+
+#define	IOCON_UNUSED	0x01
+#define	IOCON_INTPOL	0x02
+#define	IOCON_ODR	0x04
+#define	IOCON_HAEN	0x08
+#define	IOCON_DISSLW	0x10
+#define	IOCON_SEQOP	0x20
+#define	IOCON_MIRROR	0x40
+#define	IOCON_BANK_MODE	0x80
+
+// Default initialisation mode
+
+#define	IOCON_INIT	(IOCON_SEQOP)
+
+// SPI Command codes
+
+#define	CMD_WRITE	0x40
+#define CMD_READ	0x41

wiringPi/mcp23x0817.h

@@ -0,0 +1,87 @@
+/*
+ * mcp23xxx:
+ *	Copyright (c) 2012-2013 Gordon Henderson
+ *
+ *	Header file for code using the MCP23x08 and 17 GPIO expander
+ *	chips.
+ *	This comes in 2 flavours: MCP230xx (08/17) which has an I2C
+ *	interface, and the MXP23Sxx (08/17) which has an SPI interface.
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+// MCP23x08 Registers
+	
+#define	MCP23x08_IODIR		0x00
+#define	MCP23x08_IPOL		0x01
+#define	MCP23x08_GPINTEN	0x02
+#define	MCP23x08_DEFVAL		0x03
+#define	MCP23x08_INTCON		0x04
+#define	MCP23x08_IOCON		0x05
+#define	MCP23x08_GPPU		0x06
+#define	MCP23x08_INTF		0x07
+#define	MCP23x08_INTCAP		0x08
+#define	MCP23x08_GPIO		0x09
+#define	MCP23x08_OLAT		0x0A
+
+// MCP23x17 Registers
+
+#define	MCP23x17_IODIRA		0x00
+#define	MCP23x17_IPOLA		0x02
+#define	MCP23x17_GPINTENA	0x04
+#define	MCP23x17_DEFVALA	0x06
+#define	MCP23x17_INTCONA	0x08
+#define	MCP23x17_IOCON		0x0A
+#define	MCP23x17_GPPUA		0x0C
+#define	MCP23x17_INTFA		0x0E
+#define	MCP23x17_INTCAPA	0x10
+#define	MCP23x17_GPIOA		0x12
+#define	MCP23x17_OLATA		0x14
+
+#define	MCP23x17_IODIRB		0x01
+#define	MCP23x17_IPOLB		0x03
+#define	MCP23x17_GPINTENB	0x05
+#define	MCP23x17_DEFVALB	0x07
+#define	MCP23x17_INTCONB	0x09
+#define	MCP23x17_IOCONB		0x0B
+#define	MCP23x17_GPPUB		0x0D
+#define	MCP23x17_INTFB		0x0F
+#define	MCP23x17_INTCAPB	0x11
+#define	MCP23x17_GPIOB		0x13
+#define	MCP23x17_OLATB		0x15
+
+// Bits in the IOCON register
+
+#define	IOCON_UNUSED	0x01
+#define	IOCON_INTPOL	0x02
+#define	IOCON_ODR	0x04
+#define	IOCON_HAEN	0x08
+#define	IOCON_DISSLW	0x10
+#define	IOCON_SEQOP	0x20
+#define	IOCON_MIRROR	0x40
+#define	IOCON_BANK_MODE	0x80
+
+// Default initialisation mode
+
+#define	IOCON_INIT	(IOCON_SEQOP)
+
+// SPI Command codes
+
+#define	CMD_WRITE	0x40
+#define CMD_READ	0x41

wiringPi/mcp3002.c

@@ -0,0 +1,76 @@
+/*
+ * mcp3002.c:
+ *	Extend wiringPi with the MCP3002 SPI Analog to Digital convertor
+ *	Copyright (c) 2012-2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <wiringPi.h>
+#include <wiringPiSPI.h>
+
+#include "mcp3002.h"
+
+/*
+ * myAnalogRead:
+ *	Return the analog value of the given pin
+ *********************************************************************************
+ */
+
+static int myAnalogRead (struct wiringPiNodeStruct *node, int pin)
+{
+  unsigned char spiData [2] ;
+  unsigned char chanBits ;
+  int chan = pin - node->pinBase ;
+
+  if (chan == 0)
+    chanBits = 0b11010000 ;
+  else
+    chanBits = 0b11110000 ;
+
+  spiData [0] = chanBits ;
+  spiData [1] = 0 ;
+
+  wiringPiSPIDataRW (node->fd, spiData, 2) ;
+
+  return ((spiData [0] << 7) | (spiData [1] >> 1)) & 0x3FF ;
+}
+
+
+/*
+ * mcp3002Setup:
+ *	Create a new wiringPi device node for an mcp2003 on the Pi's
+ *	SPI interface.
+ *********************************************************************************
+ */
+
+int mcp3002Setup (const int pinBase, int spiChannel)
+{
+  struct wiringPiNodeStruct *node ;
+
+  if (wiringPiSPISetup (spiChannel, 1000000) < 0)
+    return -1 ;
+
+  node = wiringPiNewNode (pinBase, 2) ;
+
+  node->fd         = spiChannel ;
+  node->analogRead = myAnalogRead ;
+
+  return 0 ;
+}

wiringPi/mcp3002.h

@@ -0,0 +1,33 @@
+/*
+ * mcp3002.c:
+ *	Extend wiringPi with the MCP3002 SPI Analog to Digital convertor
+ *	Copyright (c) 2012-2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern int mcp3002Setup (int pinBase, int spiChannel) ;
+
+#ifdef __cplusplus
+}
+#endif

wiringPi/mcp3422.c

@@ -0,0 +1,116 @@
+/*
+ * mcp3422.c:
+ *	Extend wiringPi with the MCP3422 I2C ADC chip
+ *	Copyright (c) 2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+
+#include <stdio.h>
+#include <stdint.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <linux/spi/spidev.h>
+
+#include <wiringPi.h>
+#include <wiringPiI2C.h>
+
+#include "mcp3422.h"
+
+
+/*
+ * myAnalogRead:
+ *	Read a channel from the device
+ *********************************************************************************
+ */
+
+int myAnalogRead (struct wiringPiNodeStruct *node, int chan)
+{
+  unsigned char config, b0, b1, b2, b3 ;
+  int value = 0 ;
+
+// One-shot mode, trigger plus the other configs.
+
+  config = 0x80 | ((chan - node->pinBase) << 5) | (node->data0 << 2) | (node->data1) ;
+  
+  wiringPiI2CWrite (node->fd, config) ;
+
+  switch (node->data0)	// Sample rate
+  {
+    case MCP3422_SR_3_75:			// 18 bits
+      delay (270) ;
+      b0 = wiringPiI2CRead (node->fd) ;
+      b1 = wiringPiI2CRead (node->fd) ;
+      b2 = wiringPiI2CRead (node->fd) ;
+      b3 = wiringPiI2CRead (node->fd) ;
+      value = ((b0 & 3) << 16) | (b1 << 8) | b2 ;
+      break ;
+
+    case MCP3422_SR_15:				// 16 bits
+      delay ( 70) ;
+      b0 = wiringPiI2CRead (node->fd) ;
+      b1 = wiringPiI2CRead (node->fd) ;
+      b2 = wiringPiI2CRead (node->fd) ;
+      value = (b0 << 8) | b1 ;
+      break ;
+
+    case MCP3422_SR_60:				// 14 bits
+      delay ( 17) ;
+      b0 = wiringPiI2CRead (node->fd) ;
+      b1 = wiringPiI2CRead (node->fd) ;
+      b2 = wiringPiI2CRead (node->fd) ;
+      value = ((b0 & 0x3F) << 8) | b1 ;
+      break ;
+
+    case MCP3422_SR_240:			// 12 bits
+      delay (  5) ;
+      b0 = wiringPiI2CRead (node->fd) ;
+      b1 = wiringPiI2CRead (node->fd) ;
+      b2 = wiringPiI2CRead (node->fd) ;
+      value = ((b0 & 0x0F) << 8) | b1 ;
+      break ;
+  }
+
+  return value ;
+}
+
+
+/*
+ * mcp3422Setup:
+ *	Create a new wiringPi device node for the mcp3422
+ *********************************************************************************
+ */
+
+int mcp3422Setup (int pinBase, int i2cAddress, int channels, int sampleRate, int gain)
+{
+  int fd ;
+  struct wiringPiNodeStruct *node ;
+
+  if ((fd = wiringPiI2CSetup (i2cAddress)) < 0)
+    return fd ;
+
+  node = wiringPiNewNode (pinBase, channels) ;
+
+  node->data0      = sampleRate ;
+  node->data1      = gain ;
+  node->analogRead = myAnalogRead ;
+
+  return 0 ;
+}

wiringPi/mcp3422.h

@@ -0,0 +1,43 @@
+/*
+ * mcp3422.c:
+ *	Extend wiringPi with the MCP3422 I2C ADC chip
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#define	MCP3422_SR_3_75	0
+#define	MCP3422_SR_15	1
+#define	MCP3422_SR_60	2
+#define	MCP3422_SR_240	3
+
+#define	MCP3422_GAIN_1	0
+#define	MCP3422_GAIN_2	1
+#define	MCP3422_GAIN_4	2
+#define	MCP3422_GAIN_8	3
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern int mcp3422Setup (int pinBase, int i2cAddress, int channels, int sampleRate, int gain) ;
+
+#ifdef __cplusplus
+}
+#endif

wiringPi/mcp4802.c

@@ -0,0 +1,76 @@
+/*
+ * mcp4802.c:
+ *	Extend wiringPi with the MCP4802 SPI Digital to Analog convertor
+ *	Copyright (c) 2012-2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <wiringPi.h>
+#include <wiringPiSPI.h>
+
+#include "mcp4802.h"
+
+/*
+ * myAnalogWrite:
+ *	Write analog value on the given pin
+ *********************************************************************************
+ */
+
+static void myAnalogWrite (struct wiringPiNodeStruct *node, int pin, int value)
+{
+  unsigned char spiData [2] ;
+  unsigned char chanBits, dataBits ;
+  int chan = pin - node->pinBase ;
+
+  if (chan == 0)
+    chanBits = 0x30 ;
+  else
+    chanBits = 0xB0 ;
+
+  chanBits |= ((value >> 4) & 0x0F) ;
+  dataBits  = ((value << 4) & 0xF0) ;
+
+  spiData [0] = chanBits ;
+  spiData [1] = dataBits ;
+
+  wiringPiSPIDataRW (node->fd, spiData, 2) ;
+}
+
+/*
+ * mcp4802Setup:
+ *	Create a new wiringPi device node for an mcp4802 on the Pi's
+ *	SPI interface.
+ *********************************************************************************
+ */
+
+int mcp4802Setup (const int pinBase, int spiChannel)
+{
+  struct wiringPiNodeStruct *node ;
+
+  if (wiringPiSPISetup (spiChannel, 1000000) < 0)
+    return -1 ;
+
+  node = wiringPiNewNode (pinBase, 2) ;
+
+  node->fd          = spiChannel ;
+  node->analogWrite = myAnalogWrite ;
+
+  return 0 ;
+}

wiringPi/mcp4802.h

@@ -0,0 +1,33 @@
+/*
+ * mcp4802.c:
+ *	Extend wiringPi with the MCP4802 SPI Digital to Analog convertor
+ *	Copyright (c) 2012-2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern int mcp4802Setup (int pinBase, int spiChannel) ;
+
+#ifdef __cplusplus
+}
+#endif

wiringPi/pcf8574.c

@@ -0,0 +1,126 @@
+/*
+ * pcf8574.c:
+ *	Extend wiringPi with the PFC8574 I2C GPIO expander chip
+ *	Copyright (c) 2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+#include <pthread.h>
+
+#include "wiringPi.h"
+#include "wiringPiI2C.h"
+
+#include "pcf8574.h"
+
+
+/*
+ * myPinMode:
+ *	The PFC8574 is an odd chip - the pins are effectively bi-directional,
+ *	however the pins should be drven high when used as an input pin...
+ *	So, we're effectively copying digitalWrite...
+ *********************************************************************************
+ */
+
+static void myPinMode (struct wiringPiNodeStruct *node, int pin, int mode)
+{
+  int bit, old ;
+
+  bit  = 1 << ((pin - node->pinBase) & 7) ;
+
+  old = node->data2 ;
+  if (mode == OUTPUT)
+    old &= (~bit) ;	// Write bit to 0
+  else
+    old |=   bit ;	// Write bit to 1
+
+  wiringPiI2CWrite (node->fd, old) ;
+  node->data2 = old ;
+}
+
+
+
+/*
+ * myDigitalWrite:
+ *********************************************************************************
+ */
+
+static void myDigitalWrite (struct wiringPiNodeStruct *node, int pin, int value)
+{
+  int bit, old ;
+
+  bit  = 1 << ((pin - node->pinBase) & 7) ;
+
+  old = node->data2 ;
+  if (value == LOW)
+    old &= (~bit) ;
+  else
+    old |=   bit ;
+
+  wiringPiI2CWrite (node->fd, old) ;
+  node->data2 = old ;
+}
+
+
+/*
+ * myDigitalRead:
+ *********************************************************************************
+ */
+
+static int myDigitalRead (struct wiringPiNodeStruct *node, int pin)
+{
+  int mask, value ;
+
+  mask  = 1 << ((pin - node->pinBase) & 7) ;
+  value = wiringPiI2CRead (node->fd) ;
+
+  if ((value & mask) == 0)
+    return LOW ;
+  else 
+    return HIGH ;
+}
+
+
+/*
+ * pcf8574Setup:
+ *	Create a new instance of a PFC8574 I2C GPIO interface. We know it
+ *	has 8 pins, so all we need to know here is the I2C address and the
+ *	user-defined pin base.
+ *********************************************************************************
+ */
+
+int pcf8574Setup (const int pinBase, const int i2cAddress)
+{
+  int fd ;
+  struct wiringPiNodeStruct *node ;
+
+  if ((fd = wiringPiI2CSetup (i2cAddress)) < 0)
+    return fd ;
+
+  node = wiringPiNewNode (pinBase, 8) ;
+
+  node->fd              = fd ;
+  node->pinMode         = myPinMode ;
+  node->digitalRead     = myDigitalRead ;
+  node->digitalWrite    = myDigitalWrite ;
+  node->data2           = wiringPiI2CRead (fd) ;
+
+  return 0 ;
+}

wiringPi/pcf8574.h

@@ -0,0 +1,33 @@
+/*
+ * pfc8574.h:
+ *	Extend wiringPi with the PFC8574 I2C GPIO expander chip
+ *	Copyright (c) 2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern int pfc8574Setup (const int pinBase, const int i2cAddress) ;
+
+#ifdef __cplusplus
+}
+#endif

wiringPi/piHiPri.c

@@ -36,15 +36,16 @@
  *********************************************************************************
  */
 
-int piHiPri (int pri)
+int piHiPri (const int pri)
 {
   struct sched_param sched ;
 
   memset (&sched, 0, sizeof(sched)) ;
 
   if (pri > sched_get_priority_max (SCHED_RR))
-    pri = sched_get_priority_max (SCHED_RR) ;
+    sched.sched_priority = sched_get_priority_max (SCHED_RR) ;
+  else
+    sched.sched_priority = pri ;
 
-  sched.sched_priority = pri ;
   return sched_setscheduler (0, SCHED_RR, &sched) ;
 }

wiringPi/softPwm.c

@@ -28,7 +28,7 @@
 #include "wiringPi.h"
 #include "softPwm.h"
 
-#define	MAX_PINS	64
+#define	MAX_PINS	1024
 
 // The PWM Frequency is derived from the "pulse time" below. Essentially,
 //	the frequency is a function of the range and this pulse time.
@@ -93,7 +93,7 @@ static PI_THREAD (softPwmThread)
 
 void softPwmWrite (int pin, int value)
 {
-  pin &= 63 ;
+  pin &= (MAX_PINS - 1) ;
 
   /**/ if (value < 0)
     value = 0 ;

wiringPi/softTone.c

@@ -36,7 +36,7 @@
 
 #define	PULSE_TIME	100
 
-static int frewqs [MAX_PINS] ;
+static int freqs [MAX_PINS] ;
 
 static int newPin = -1 ;
 
@@ -49,7 +49,7 @@ static int newPin = -1 ;
 
 static PI_THREAD (softToneThread)
 {
-  int pin, frewq, halfPeriod ;
+  int pin, freq, halfPeriod ;
 
   pin    = newPin ;
   newPin = -1 ;
@@ -58,12 +58,12 @@ static PI_THREAD (softToneThread)
 
   for (;;)
   {
-    frewq = frewqs [pin] ;
-    if (frewq == 0)
+    freq = freqs [pin] ;
+    if (freq == 0)
       delay (1) ;
     else
     {
-      halfPeriod = 500000 / frewq ;
+      halfPeriod = 500000 / freq ;
 
       digitalWrite (pin, HIGH) ;
       delayMicroseconds (halfPeriod) ;
@@ -83,16 +83,16 @@ static PI_THREAD (softToneThread)
  *********************************************************************************
  */
 
-void softToneWrite (int pin, int frewq)
+void softToneWrite (int pin, int freq)
 {
   pin &= 63 ;
 
-  /**/ if (frewq < 0)
-    frewq = 0 ;
-  else if (frewq > 5000)	// Max 5KHz
-    frewq = 5000 ;
+  /**/ if (freq < 0)
+    freq = 0 ;
+  else if (freq > 5000)	// Max 5KHz
+    freq = 5000 ;
 
-  frewqs [pin] = frewq ;
+  freqs [pin] = freq ;
 }
 
 
@@ -109,7 +109,7 @@ int softToneCreate (int pin)
   pinMode      (pin, OUTPUT) ;
   digitalWrite (pin, LOW) ;
 
-  frewqs [pin] = 0 ;
+  freqs [pin] = 0 ;
 
   newPin = pin ;
   res = piThreadCreate (softToneThread) ;

wiringPi/softTone.h

@@ -31,7 +31,7 @@ extern "C" {
 #endif
 
 extern int  softToneCreate (int pin) ;
-extern void softToneWrite  (int pin, int frewq) ;
+extern void softToneWrite  (int pin, int freq) ;
 
 #ifdef __cplusplus
 }

wiringPi/sr595.c

@@ -0,0 +1,109 @@
+/*
+ * sr595.c:
+ *	Extend wiringPi with the 74x595 shift register as a GPIO
+ *	expander chip.
+ *	Note that the code can cope with a number of 595's
+ *	daisy-chained together - up to 4 for now as we're storing
+ *	the output "register" in a single unsigned int.
+ *
+ *	Copyright (c) 2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+
+#include "wiringPi.h"
+
+#include "sr595.h"
+
+
+/*
+ * myDigitalWrite:
+ *********************************************************************************
+ */
+
+static void myDigitalWrite (struct wiringPiNodeStruct *node, int pin, int value)
+{
+  unsigned int mask ;
+  int  dataPin, clockPin, latchPin ;
+  int  bit, bits, output ;
+
+  pin     -= node->pinBase ;				// Normalise pin number
+  bits     = node->pinMax - node->pinBase + 1 ;		// ie. number of clock pulses
+  dataPin  = node->data0 ;
+  clockPin = node->data1 ;
+  latchPin = node->data2 ;
+  output   = node->data3 ;
+
+  mask = 1 << pin ;
+
+  if (value == LOW)
+    output &= (~mask) ;
+  else
+    output |=   mask ;
+
+  node->data3 = output ;
+
+// A low -> high latch transition copies the latch to the output pins
+
+  digitalWrite (latchPin, LOW) ; delayMicroseconds (1) ;
+    for (bit = bits - 1 ; bit >= 0 ; --bit)
+    {
+      digitalWrite (dataPin, output & (1 << bit)) ;
+
+      digitalWrite (clockPin, HIGH) ; delayMicroseconds (1) ;
+      digitalWrite (clockPin, LOW) ;  delayMicroseconds (1) ;
+    }
+  digitalWrite (latchPin, HIGH) ; delayMicroseconds (1) ;
+}
+
+
+/*
+ * sr595Setup:
+ *	Create a new instance of a 74x595 shift register GPIO expander.
+ *********************************************************************************
+ */
+
+int sr595Setup (const int pinBase, const int numPins,
+	const int dataPin, const int clockPin, const int latchPin) 
+{
+  struct wiringPiNodeStruct *node ;
+
+  node = wiringPiNewNode (pinBase, numPins) ;
+
+  node->data0           = dataPin ;
+  node->data1           = clockPin ;
+  node->data2           = latchPin ;
+  node->data3           = 0 ;		// Output register
+  node->digitalWrite    = myDigitalWrite ;
+
+// Initialise the underlying hardware
+
+  digitalWrite (dataPin,  LOW) ;
+  digitalWrite (clockPin, LOW) ;
+  digitalWrite (latchPin, HIGH) ;
+
+  pinMode (dataPin,  OUTPUT) ;
+  pinMode (clockPin, OUTPUT) ;
+  pinMode (latchPin, OUTPUT) ;
+
+  return 0 ;
+}

wiringPi/sr595.h

@@ -0,0 +1,34 @@
+/*
+ * sr595.h:
+ *	Extend wiringPi with the 74x595 shift registers.
+ *	Copyright (c) 2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern int sr595Setup (const int pinBase, const int numPins,
+	const int dataPin, const int clockPin, const int latchPin) ;
+
+#ifdef __cplusplus
+}
+#endif

wiringPi/wiringPi.h

@@ -29,7 +29,8 @@
 #define	WPI_MODE_PINS		 0
 #define	WPI_MODE_GPIO		 1
 #define	WPI_MODE_GPIO_SYS	 2
-#define	WPI_MODE_PIFACE		 3
+#define	WPI_MODE_PHYS		 3
+#define	WPI_MODE_PIFACE		 4
 #define	WPI_MODE_UNINITIALISED	-1
 
 // Pin modes
@@ -64,6 +65,42 @@
 
 #define	PI_THREAD(X)	void *X (void *dummy)
 
+// Failure modes
+
+#define	WPI_FATAL	(1==1)
+#define	WPI_ALMOST	(1==2)
+
+
+// wiringPiNodeStruct:
+//	This describes additional device nodes in the extended wiringPi
+//	2.0 scheme of things.
+//	It's a simple linked list for now, but will hopefully migrate to 
+//	a binary tree for efficiency reasons - but then again, the chances
+//	of more than 1 or 2 devices being added are fairly slim, so who
+//	knows....
+
+struct wiringPiNodeStruct
+{
+  int     pinBase ;
+  int     pinMax ;
+
+  int          fd ;	// Node specific
+  unsigned int data0 ;	//  ditto
+  unsigned int data1 ;	//  ditto
+  unsigned int data2 ;	//  ditto
+  unsigned int data3 ;	//  ditto
+
+  void   (*pinMode)         (struct wiringPiNodeStruct *node, int pin, int mode) ;
+  void   (*pullUpDnControl) (struct wiringPiNodeStruct *node, int pin, int mode) ;
+  int    (*digitalRead)     (struct wiringPiNodeStruct *node, int pin) ;
+  void   (*digitalWrite)    (struct wiringPiNodeStruct *node, int pin, int value) ;
+  void   (*pwmWrite)        (struct wiringPiNodeStruct *node, int pin, int value) ;
+  int    (*analogRead)      (struct wiringPiNodeStruct *node, int pin) ;
+  void   (*analogWrite)     (struct wiringPiNodeStruct *node, int pin, int value) ;
+
+  struct wiringPiNodeStruct *next ;
+} ;
+
 
 // Function prototypes
 //	c++ wrappers thanks to a comment by Nick Lott
@@ -73,46 +110,61 @@
 extern "C" {
 #endif
 
-// Basic wiringPi functions
+// Internal
+
+extern int wiringPiFailure (int fatal, const char *message, ...) ;
+
+// Core wiringPi functions
+
+extern struct wiringPiNodeStruct *wiringPiNewNode (int pinBase, int numPins) ;
 
 extern int  wiringPiSetup       (void) ;
 extern int  wiringPiSetupSys    (void) ;
 extern int  wiringPiSetupGpio   (void) ;
-extern int  wiringPiSetupPiFace (void) ;
+extern int  wiringPiSetupPhys   (void) ;
 
-extern int  piBoardRev          (void) ;
-extern int  wpiPinToGpio        (int wpiPin) ;
+extern void pinMode             (int pin, int mode) ;
+extern void pullUpDnControl     (int pin, int pud) ;
+extern int  digitalRead         (int pin) ;
+extern void digitalWrite        (int pin, int value) ;
+extern void pwmWrite            (int pin, int value) ;
+extern int  analogRead          (int pin) ;
+extern void analogWrite         (int pin, int value) ;
+
+// PiFace specifics 
+//	(Deprecated)
 
+extern int  wiringPiSetupPiFace (void) ;
 extern int  wiringPiSetupPiFaceForGpioProg (void) ;	// Don't use this - for gpio program only
 
-extern void (*pinMode)           (int pin, int mode) ;
-extern int  (*getAlt)            (int pin) ;
-extern void (*pullUpDnControl)   (int pin, int pud) ;
-extern void (*digitalWrite)      (int pin, int value) ;
-extern void (*digitalWriteByte)  (int value) ;
-extern void (*gpioClockSet)      (int pin, int freq) ;
-extern void (*pwmWrite)          (int pin, int value) ;
-extern void (*setPadDrive)       (int group, int value) ;
-extern int  (*digitalRead)       (int pin) ;
-extern void (*pwmSetMode)        (int mode) ;
-extern void (*pwmSetRange)       (unsigned int range) ;
-extern void (*pwmSetClock)       (int divisor) ;
+// On-Board Raspberry Pi hardware specific stuff
+
+extern int  piBoardRev          (void) ;
+extern int  wpiPinToGpio        (int wpiPin) ;
+extern int  physPinToGpio       (int physPin) ;
+extern void setPadDrive         (int group, int value) ;
+extern int  getAlt              (int pin) ;
+extern void digitalWriteByte    (int value) ;
+extern void pwmSetMode          (int mode) ;
+extern void pwmSetRange         (unsigned int range) ;
+extern void pwmSetClock         (int divisor) ;
+extern void gpioClockSet        (int pin, int freq) ;
 
 // Interrupts
+//	(Also Pi hardware specific)
 
-extern int  (*waitForInterrupt) (int pin, int mS) ;
+extern int  waitForInterrupt    (int pin, int mS) ;
 extern int  wiringPiISR         (int pin, int mode, void (*function)(void)) ;
 
 // Threads
 
-extern int  piThreadCreate (void *(*fn)(void *)) ;
-extern void piLock         (int key) ;
-extern void piUnlock       (int key) ;
+extern int  piThreadCreate      (void *(*fn)(void *)) ;
+extern void piLock              (int key) ;
+extern void piUnlock            (int key) ;
 
 // Schedulling priority
 
-extern int piHiPri (int pri) ;
-
+extern int piHiPri (const int pri) ;
 
 // Extras from arduino land
 

wiringPi/wiringPiFace.c

@@ -1,362 +0,0 @@
-/*
- * wiringPiFace:
- *	Arduino compatable (ish) Wiring library for the Raspberry Pi
- *	Copyright (c) 2012 Gordon Henderson
- *
- *	This file to interface with the PiFace peripheral device which
- *	has an MCP23S17 GPIO device connected via the SPI bus.
- *
- ***********************************************************************
- * This file is part of wiringPi:
- *	https://projects.drogon.net/raspberry-pi/wiringpi/
- *
- *    wiringPi is free software: you can redistribute it and/or modify
- *    it under the terms of the GNU Lesser General Public License as
- *    published by the Free Software Foundation, either version 3 of the
- *    License, or (at your option) any later version.
- *
- *    wiringPi is distributed in the hope that it will be useful,
- *    but WITHOUT ANY WARRANTY; without even the implied warranty of
- *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *    GNU Lesser General Public License for more details.
- *
- *    You should have received a copy of the GNU Lesser General Public
- *    License along with wiringPi.
- *    If not, see <http://www.gnu.org/licenses/>.
- ***********************************************************************
- */
-
-
-#include <stdio.h>
-#include <stdint.h>
-#include <fcntl.h>
-#include <sys/ioctl.h>
-#include <sys/types.h>
-#include <linux/spi/spidev.h>
-
-#include "wiringPi.h"
-
-
-// The SPI bus parameters
-//	Variables as they need to be passed as pointers later on
-
-static char       *spiDevice = "/dev/spidev0.0" ;
-static uint8_t     spiMode   = 0 ;
-static uint8_t     spiBPW    = 8 ;
-static uint32_t    spiSpeed  = 5000000 ;
-static uint16_t    spiDelay  = 0;
-
-// Locals here to keep track of everything
-
-static int spiFd ;
-
-// The MCP23S17 doesn't have bit-set operations, so it's
-//	cheaper to keep a copy here than to read/modify/write it
-
-uint8_t dataOutRegister = 0 ;
-uint8_t     pudRegister = 0 ;
-
-// MCP23S17 Registers
-
-#define	IOCON		0x0A
-
-#define	IODIRA		0x00
-#define	IPOLA		0x02
-#define	GPINTENA	0x04
-#define	DEFVALA		0x06
-#define	INTCONA		0x08
-#define	GPPUA		0x0C
-#define	INTFA		0x0E
-#define	INTCAPA		0x10
-#define	GPIOA		0x12
-#define	OLATA		0x14
-
-#define	IODIRB		0x01
-#define	IPOLB		0x03
-#define	GPINTENB	0x05
-#define	DEFVALB		0x07
-#define	INTCONB		0x09
-#define	GPPUB		0x0D
-#define	INTFB		0x0F
-#define	INTCAPB		0x11
-#define	GPIOB		0x13
-#define	OLATB		0x15
-
-// Bits in the IOCON register
-
-#define	IOCON_BANK_MODE	0x80
-#define	IOCON_MIRROR	0x40
-#define	IOCON_SEQOP	0x20
-#define	IOCON_DISSLW	0x10
-#define	IOCON_HAEN	0x08
-#define	IOCON_ODR	0x04
-#define	IOCON_INTPOL	0x02
-#define	IOCON_UNUSED	0x01
-
-// Default initialisation mode
-
-#define	IOCON_INIT	(IOCON_SEQOP)
-
-// Command codes
-
-#define	CMD_WRITE	0x40
-#define CMD_READ	0x41
-
-
-/*
- * writeByte:
- *	Write a byte to a register on the MCP23S17 on the SPI bus.
- *	This is using the synchronous access mechanism.
- *********************************************************************************
- */
-
-static void writeByte (uint8_t reg, uint8_t data)
-{
-  uint8_t spiBufTx [3] ;
-  uint8_t spiBufRx [3] ;
-  struct spi_ioc_transfer spi ;
-
-  spiBufTx [0] = CMD_WRITE ;
-  spiBufTx [1] = reg ;
-  spiBufTx [2] = data ;
-
-  spi.tx_buf        = (unsigned long)spiBufTx ;
-  spi.rx_buf        = (unsigned long)spiBufRx ;
-  spi.len           = 3 ;
-  spi.delay_usecs   = spiDelay ;
-  spi.speed_hz      = spiSpeed ;
-  spi.bits_per_word = spiBPW ;
-
-  ioctl (spiFd, SPI_IOC_MESSAGE(1), &spi) ;
-}
-
-/*
- * readByte:
- *	Read a byte from a register on the MCP23S17 on the SPI bus.
- *	This is the synchronous access mechanism.
- *	What appears to happen is that the data returned is at
- *	the same offset as the number of bytes written to the device. So if we
- *	write 2 bytes (e.g. command then register number), then the data returned
- *	will by at the 3rd byte...
- *********************************************************************************
- */
-
-static uint8_t readByte (uint8_t reg)
-{
-  uint8_t tx [4] ;
-  uint8_t rx [4] ;
-  struct spi_ioc_transfer spi ;
-
-  tx [0] = CMD_READ ;
-  tx [1] = reg ;
-  tx [2] = 0 ;
-
-  spi.tx_buf        = (unsigned long)tx ;
-  spi.rx_buf        = (unsigned long)rx ;
-  spi.len           = 3 ;
-  spi.delay_usecs   = spiDelay ;
-  spi.speed_hz      = spiSpeed ;
-  spi.bits_per_word = spiBPW ;
-
-  ioctl (spiFd, SPI_IOC_MESSAGE(1), &spi) ;
-
-  return rx [2] ;
-}
-
-
-/*
- * digitalWritePiFace:
- *	Perform the digitalWrite function on the PiFace board
- *********************************************************************************
- */
-
-void digitalWritePiFace (int pin, int value)
-{
-  uint8_t mask = 1 << pin ;
-
-  if (value == 0)
-    dataOutRegister &= (~mask) ;
-  else
-    dataOutRegister |=   mask ;
-
-  writeByte (GPIOA, dataOutRegister) ;
-}
-
-void digitalWriteBytePiFace (int value)
-{
-  writeByte (GPIOA, value) ;
-}
-
-
-void digitalWritePiFaceSpecial (int pin, int value)
-{
-  uint8_t mask = 1 << pin ;
-  uint8_t old ;
-
-  old = readByte (GPIOA) ;
-
-  if (value == 0)
-    old &= (~mask) ;
-  else
-    old |=   mask ;
-
-  writeByte (GPIOA, old) ;
-}
-
-
-/*
- * digitalReadPiFace:
- *	Perform the digitalRead function on the PiFace board
- *********************************************************************************
- */
-
-int digitalReadPiFace (int pin)
-{
-  uint8_t mask = 1 << pin ;
-
-  if ((readByte (GPIOB) & mask) != 0)
-    return HIGH ;
-  else
-    return LOW ;
-}
-
-
-/*
- * pullUpDnControlPiFace:
- *	Perform the pullUpDnControl function on the PiFace board
- *********************************************************************************
- */
-
-void pullUpDnControlPiFace (int pin, int pud)
-{
-  uint8_t mask = 1 << pin ;
-
-  if (pud == PUD_UP)
-    pudRegister |=   mask ;
-  else
-    pudRegister &= (~mask) ;
-
-  writeByte (GPPUB, pudRegister) ;
-
-}
-
-
-void pullUpDnControlPiFaceSpecial (int pin, int pud)
-{
-  uint8_t mask = 1 << pin ;
-  uint8_t old ;
-
-  old = readByte (GPPUB) ;
-
-  if (pud == PUD_UP)
-    old |=   mask ;
-  else
-    old &= (~mask) ;
-
-  writeByte (GPPUB, old) ;
-
-}
-
-
-
-/*
- * Dummy functions that are not used in this mode
- *********************************************************************************
- */
-
-void pinModePiFace          (int pin, int mode)  {}
-void pwmWritePiFace         (int pin, int value) {}
-int  waitForInterruptPiFace (int pin, int mS)    { return 0 ; }
-
-
-/*
- * wiringPiSetupPiFace
- *	Setup the SPI interface and initialise the MCP23S17 chip
- *********************************************************************************
- */
-
-static int _wiringPiSetupPiFace (void)
-{
-  if ((spiFd = open (spiDevice, O_RDWR)) < 0)
-    return -1 ;
-
-// Set SPI parameters
-//	Why are we doing a read after write?
-//	I don't know - just blindliy copying an example elsewhere... -GH-
-
-  if (ioctl (spiFd, SPI_IOC_WR_MODE, &spiMode) < 0)
-    return -1 ;
-
-  if (ioctl (spiFd, SPI_IOC_RD_MODE, &spiMode) < 0)
-    return -1 ;
-
-  if (ioctl (spiFd, SPI_IOC_WR_BITS_PER_WORD, &spiBPW) < 0)
-    return -1 ;
-
-  if (ioctl (spiFd, SPI_IOC_RD_BITS_PER_WORD, &spiBPW) < 0)
-    return -1 ;
-
-  if (ioctl (spiFd, SPI_IOC_WR_MAX_SPEED_HZ, &spiSpeed) < 0)
-    return -1 ;
-
-  if (ioctl (spiFd, SPI_IOC_RD_MAX_SPEED_HZ, &spiSpeed) < 0)
-    return -1 ;
-
-// Setup the MCP23S17
-
-  writeByte (IOCON, IOCON_INIT) ;
-
-  writeByte (IODIRA, 0x00) ;	// Port A -> Outputs
-  writeByte (IODIRB, 0xFF) ;	// Port B -> Inputs
-
-  return 0 ;
-}
-
-
-int wiringPiSetupPiFace (void)
-{
-  int x = _wiringPiSetupPiFace () ;
-
-  if (x != 0)
-    return x ;
-
-  writeByte (GPIOA, 0x00) ;	// Set all outptus off
-  writeByte (GPPUB, 0x00) ;	// Disable any pull-ups on port B
-
-           pinMode =              pinModePiFace ;
-   pullUpDnControl =      pullUpDnControlPiFace ;
-      digitalWrite =         digitalWritePiFace ;
-  digitalWriteByte =     digitalWriteBytePiFace ;
-          pwmWrite =             pwmWritePiFace ;
-       digitalRead =          digitalReadPiFace ;
-  waitForInterrupt =     waitForInterruptPiFace ;
-
-  return 0 ;
-}
-
-
-/*
- * wiringPiSetupPiFaceForGpioProg:
- *	Setup the SPI interface and initialise the MCP23S17 chip
- *	Special version for the gpio program
- *********************************************************************************
- */
-
-
-int wiringPiSetupPiFaceForGpioProg (void)
-{
-  int x = _wiringPiSetupPiFace () ;
-
-  if (x != 0)
-    return x ;
-
-           pinMode =                 pinModePiFace ;
-   pullUpDnControl =  pullUpDnControlPiFaceSpecial ;
-      digitalWrite =     digitalWritePiFaceSpecial ;
-  digitalWriteByte =        digitalWriteBytePiFace ;
-          pwmWrite =                pwmWritePiFace ;
-       digitalRead =             digitalReadPiFace ;
-  waitForInterrupt =        waitForInterruptPiFace ;
-
-  return 0 ;
-}

wiringPi/wiringPiI2C.c

@@ -22,15 +22,93 @@
  ***********************************************************************
  */
 
+/*
+ * Notes:
+ *	The Linux I2C code is actually the same (almost) as the SMBus code.
+ *	SMBus is System Management Bus - and in essentially I2C with some
+ *	additional functionality added, and stricter controls on the electrical
+ *	specifications, etc. however I2C does work well with it and the
+ *	protocols work over both.
+ *
+ *	I'm directly including the SMBus functions here as some Linux distros
+ *	lack the correct header files, and also some header files are GPLv2
+ *	rather than the LGPL that wiringPi is released under - presumably because
+ *	originally no-one expected I2C/SMBus to be used outside the kernel -
+ *	however enter the Raspberry Pi with people now taking directly to I2C
+ *	devices without going via the kernel...
+ *
+ *	This may ultimately reduce the flexibility of this code, but it won't be
+ *	hard to maintain it and keep it current, should things change.
+ *
+ *	Information here gained from: kernel/Documentation/i2c/dev-interface
+ *	as well as other online resources.
+ *********************************************************************************
+ */
+
 #include <stdio.h>
 #include <stdlib.h>
+#include <stdint.h>
+#include <errno.h>
+#include <string.h>
 #include <fcntl.h>
 #include <sys/ioctl.h>
-#include <linux/i2c-dev.h>
 
 #include "wiringPi.h"
 #include "wiringPiI2C.h"
 
+// I2C definitions
+
+#define I2C_SLAVE	0x0703
+#define I2C_SMBUS	0x0720	/* SMBus-level access */
+
+#define I2C_SMBUS_READ	1
+#define I2C_SMBUS_WRITE	0
+
+// SMBus transaction types
+
+#define I2C_SMBUS_QUICK		    0
+#define I2C_SMBUS_BYTE		    1
+#define I2C_SMBUS_BYTE_DATA	    2 
+#define I2C_SMBUS_WORD_DATA	    3
+#define I2C_SMBUS_PROC_CALL	    4
+#define I2C_SMBUS_BLOCK_DATA	    5
+#define I2C_SMBUS_I2C_BLOCK_BROKEN  6
+#define I2C_SMBUS_BLOCK_PROC_CALL   7		/* SMBus 2.0 */
+#define I2C_SMBUS_I2C_BLOCK_DATA    8
+
+// SMBus messages
+
+#define I2C_SMBUS_BLOCK_MAX	32	/* As specified in SMBus standard */	
+#define I2C_SMBUS_I2C_BLOCK_MAX	32	/* Not specified but we use same structure */
+
+// Structures used in the ioctl() calls
+
+union i2c_smbus_data
+{
+  uint8_t  byte ;
+  uint16_t word ;
+  uint8_t  block [I2C_SMBUS_BLOCK_MAX + 2] ;	// block [0] is used for length + one more for PEC
+} ;
+
+struct i2c_smbus_ioctl_data
+{
+  char read_write ;
+  uint8_t command ;
+  int size ;
+  union i2c_smbus_data *data ;
+} ;
+
+static inline int i2c_smbus_access (int fd, char rw, uint8_t command, int size, union i2c_smbus_data *data)
+{
+  struct i2c_smbus_ioctl_data args ;
+
+  args.read_write = rw ;
+  args.command    = command ;
+  args.size       = size ;
+  args.data       = data ;
+  return ioctl (fd, I2C_SMBUS, &args) ;
+}
+
 
 /*
  * wiringPiI2CRead:
@@ -40,7 +118,12 @@
 
 int wiringPiI2CRead (int fd)
 {
-  return i2c_smbus_read_byte (fd) ;
+  union i2c_smbus_data data ;
+
+  if (i2c_smbus_access (fd, I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &data))
+    return -1 ;
+  else
+    return data.byte & 0xFF ;
 }
 
 
@@ -52,12 +135,22 @@ int wiringPiI2CRead (int fd)
 
 int wiringPiI2CReadReg8 (int fd, int reg)
 {
-  return i2c_smbus_read_byte_data (fd, reg) ;
+  union i2c_smbus_data data;
+
+  if (i2c_smbus_access (fd, I2C_SMBUS_READ, reg, I2C_SMBUS_BYTE_DATA, &data))
+    return -1 ;
+  else
+    return data.byte & 0xFF ;
 }
 
 int wiringPiI2CReadReg16 (int fd, int reg)
 {
-  return i2c_smbus_read_word_data (fd, reg) ;
+  union i2c_smbus_data data;
+
+  if (i2c_smbus_access (fd, I2C_SMBUS_READ, reg, I2C_SMBUS_WORD_DATA, &data))
+    return -1 ;
+  else
+    return data.byte & 0xFF ;
 }
 
 
@@ -69,7 +162,7 @@ int wiringPiI2CReadReg16 (int fd, int reg)
 
 int wiringPiI2CWrite (int fd, int data)
 {
-  return i2c_smbus_write_byte (fd, data) ;
+  return i2c_smbus_access (fd, I2C_SMBUS_WRITE, data, I2C_SMBUS_BYTE, NULL) ;
 }
 
 
@@ -79,14 +172,41 @@ int wiringPiI2CWrite (int fd, int data)
  *********************************************************************************
  */
 
-int wiringPiI2CWriteReg8 (int fd, int reg, int data)
+int wiringPiI2CWriteReg8 (int fd, int reg, int value)
 {
-  return i2c_smbus_write_byte_data (fd, reg, data) ;
+  union i2c_smbus_data data ;
+
+  data.byte = value ;
+  return i2c_smbus_access (fd, I2C_SMBUS_WRITE, reg, I2C_SMBUS_BYTE_DATA, &data) ;
 }
 
-int wiringPiI2CWriteReg16 (int fd, int reg, int data)
+int wiringPiI2CWriteReg16 (int fd, int reg, int value)
 {
-  return i2c_smbus_write_word_data (fd, reg, data) ;
+  union i2c_smbus_data data ;
+
+  data.word = value ;
+  return i2c_smbus_access (fd, I2C_SMBUS_WRITE, reg, I2C_SMBUS_WORD_DATA, &data) ;
+}
+
+
+/*
+ * wiringPiI2CSetupInterface:
+ *	Undocumented access to set the interface explicitly - might be used
+ *	for the Pi's 2nd I2C interface...
+ *********************************************************************************
+ */
+
+int wiringPiI2CSetupInterface (const char *device, int devId)
+{
+  int fd ;
+
+  if ((fd = open (device, O_RDWR)) < 0)
+    return wiringPiFailure (WPI_ALMOST, "Unable to open I2C device: %s\n", strerror (errno)) ;
+
+  if (ioctl (fd, I2C_SLAVE, devId) < 0)
+    return wiringPiFailure (WPI_ALMOST, "Unable to select I2C device: %s\n", strerror (errno)) ;
+
+  return fd ;
 }
 
 
@@ -96,27 +216,17 @@ int wiringPiI2CWriteReg16 (int fd, int reg, int data)
  *********************************************************************************
  */
 
-int wiringPiI2CSetup (int devId)
+int wiringPiI2CSetup (const int devId)
 {
-  int rev, fd ;
-  char *device ;
+  int rev ;
+  const char *device ;
 
-  if ((rev = piBoardRev ()) < 0)
-  {
-    fprintf (stderr, "wiringPiI2CSetup: Unable to determine Pi board revision\n") ;
-    exit (1) ;
-  }
+  rev = piBoardRev () ;
 
   if (rev == 1)
     device = "/dev/i2c-0" ;
   else
     device = "/dev/i2c-1" ;
 
-  if ((fd = open (device, O_RDWR)) < 0)
-    return -1 ;
-
-  if (ioctl (fd, I2C_SLAVE, devId) < 0)
-    return -1 ;
-
-  return fd ;
+  return wiringPiI2CSetupInterface (device, devId) ;
 }

wiringPi/wiringPiI2C.h

@@ -26,15 +26,16 @@
 extern "C" {
 #endif
 
-extern int wiringPiI2CRead       (int fd) ;
-extern int wiringPiI2CReadReg8   (int fd, int reg) ;
-extern int wiringPiI2CReadReg16  (int fd, int reg) ;
+extern int wiringPiI2CRead           (int fd) ;
+extern int wiringPiI2CReadReg8       (int fd, int reg) ;
+extern int wiringPiI2CReadReg16      (int fd, int reg) ;
 
-extern int wiringPiI2CWrite      (int fd, int data) ;
-extern int wiringPiI2CWriteReg8  (int fd, int reg, int data) ;
-extern int wiringPiI2CWriteReg16 (int fd, int reg, int data) ;
+extern int wiringPiI2CWrite          (int fd, int data) ;
+extern int wiringPiI2CWriteReg8      (int fd, int reg, int data) ;
+extern int wiringPiI2CWriteReg16     (int fd, int reg, int data) ;
 
-int wiringPiI2CSetup             (int devId) ;
+extern int wiringPiI2CSetupInterface (const char *device, int devId) ;
+extern int wiringPiI2CSetup          (const int devId) ;
 
 #ifdef __cplusplus
 }

wiringPi/wiringPiSPI.c

@@ -25,20 +25,24 @@
 
 #include <stdint.h>
 #include <fcntl.h>
+#include <errno.h>
+#include <string.h>
 #include <sys/ioctl.h>
 #include <linux/spi/spidev.h>
 
+#include "wiringPi.h"
+
 #include "wiringPiSPI.h"
 
 
 // The SPI bus parameters
 //	Variables as they need to be passed as pointers later on
 
-static char       *spiDev0 = "/dev/spidev0.0" ;
-static char       *spiDev1 = "/dev/spidev0.1" ;
-static uint8_t     spiMode   = 0 ;
-static uint8_t     spiBPW    = 8 ;
-static uint16_t    spiDelay  = 0;
+const static char       *spiDev0  = "/dev/spidev0.0" ;
+const static char       *spiDev1  = "/dev/spidev0.1" ;
+const static uint8_t     spiMode  = 0 ;
+const static uint8_t     spiBPW   = 8 ;
+const static uint16_t    spiDelay = 0 ;
 
 static uint32_t    spiSpeeds [2] ;
 static int         spiFds [2] ;
@@ -95,7 +99,7 @@ int wiringPiSPISetup (int channel, int speed)
   channel &= 1 ;
 
   if ((fd = open (channel == 0 ? spiDev0 : spiDev1, O_RDWR)) < 0)
-    return -1 ;
+    return wiringPiFailure (WPI_ALMOST, "Unable to open SPI device: %s\n", strerror (errno)) ;
 
   spiSpeeds [channel] = speed ;
   spiFds    [channel] = fd ;
@@ -104,14 +108,14 @@ int wiringPiSPISetup (int channel, int speed)
 //	Why are we reading it afterwriting it? I've no idea, but for now I'm blindly
 //	copying example code I've seen online...
 
-  if (ioctl (fd, SPI_IOC_WR_MODE, &spiMode)         < 0) return -1 ;
-  if (ioctl (fd, SPI_IOC_RD_MODE, &spiMode)         < 0) return -1 ;
-
-  if (ioctl (fd, SPI_IOC_WR_BITS_PER_WORD, &spiBPW) < 0) return -1 ;
-  if (ioctl (fd, SPI_IOC_RD_BITS_PER_WORD, &spiBPW) < 0) return -1 ;
+  if (ioctl (fd, SPI_IOC_WR_MODE, &spiMode)         < 0)
+    return wiringPiFailure (WPI_ALMOST, "SPI Mode Change failure: %s\n", strerror (errno)) ;
+  
+  if (ioctl (fd, SPI_IOC_WR_BITS_PER_WORD, &spiBPW) < 0)
+    return wiringPiFailure (WPI_ALMOST, "SPI BPW Change failure: %s\n", strerror (errno)) ;
 
   if (ioctl (fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed)   < 0) return -1 ;
-  if (ioctl (fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed)   < 0) return -1 ;
+    return wiringPiFailure (WPI_ALMOST, "SPI Speed Change failure: %s\n", strerror (errno)) ;
 
   return fd ;
 }

wiringPi/wiringSerial.c

@@ -41,7 +41,7 @@
  *********************************************************************************
  */
 
-int serialOpen (char *device, int baud)
+int serialOpen (const char *device, const int baud)
 {
   struct termios options ;
   speed_t myBaud ;
@@ -60,6 +60,7 @@ int serialOpen (char *device, int baud)
     case   1200:	myBaud =   B1200 ; break ;
     case   1800:	myBaud =   B1800 ; break ;
     case   2400:	myBaud =   B2400 ; break ;
+    case   4800:	myBaud =   B4800 ; break ;
     case   9600:	myBaud =   B9600 ; break ;
     case  19200:	myBaud =  B19200 ; break ;
     case  38400:	myBaud =  B38400 ; break ;
@@ -116,7 +117,7 @@ int serialOpen (char *device, int baud)
  *********************************************************************************
  */
 
-void serialFlush (int fd)
+void serialFlush (const int fd)
 {
   tcflush (fd, TCIOFLUSH) ;
 }
@@ -128,7 +129,7 @@ void serialFlush (int fd)
  *********************************************************************************
  */
 
-void serialClose (int fd)
+void serialClose (const int fd)
 {
   close (fd) ;
 }
@@ -140,7 +141,7 @@ void serialClose (int fd)
  *********************************************************************************
  */
 
-void serialPutchar (int fd, unsigned char c)
+void serialPutchar (const int fd, const unsigned char c)
 {
   write (fd, &c, 1) ;
 }
@@ -152,7 +153,7 @@ void serialPutchar (int fd, unsigned char c)
  *********************************************************************************
  */
 
-void serialPuts (int fd, char *s)
+void serialPuts (const int fd, const char *s)
 {
   write (fd, s, strlen (s)) ;
 }
@@ -163,7 +164,7 @@ void serialPuts (int fd, char *s)
  *********************************************************************************
  */
 
-void serialPrintf (int fd, char *message, ...)
+void serialPrintf (const int fd, const char *message, ...)
 {
   va_list argp ;
   char buffer [1024] ;
@@ -182,7 +183,7 @@ void serialPrintf (int fd, char *message, ...)
  *********************************************************************************
  */
 
-int serialDataAvail (int fd)
+int serialDataAvail (const int fd)
 {
   int result ;
 
@@ -201,7 +202,7 @@ int serialDataAvail (int fd)
  *********************************************************************************
  */
 
-int serialGetchar (int fd)
+int serialGetchar (const int fd)
 {
   uint8_t x ;
 

wiringPi/wiringSerial.h

@@ -24,14 +24,14 @@
 extern "C" {
 #endif
 
-extern int   serialOpen      (char *device, int baud) ;
-extern void  serialClose     (int fd) ;
-extern void  serialFlush     (int fd) ;
-extern void  serialPutchar   (int fd, unsigned char c) ;
-extern void  serialPuts      (int fd, char *s) ;
-extern void  serialPrintf    (int fd, char *message, ...) ;
-extern int   serialDataAvail (int fd) ;
-extern int   serialGetchar   (int fd) ;
+extern int   serialOpen      (const char *device, const int baud) ;
+extern void  serialClose     (const int fd) ;
+extern void  serialFlush     (const int fd) ;
+extern void  serialPutchar   (const int fd, const unsigned char c) ;
+extern void  serialPuts      (const int fd, const char *s) ;
+extern void  serialPrintf    (const int fd, const char *message, ...) ;
+extern int   serialDataAvail (const int fd) ;
+extern int   serialGetchar   (const int fd) ;
 
 #ifdef __cplusplus
 }

wiringPi/wiringShift.c

@@ -56,7 +56,6 @@ uint8_t shiftIn (uint8_t dPin, uint8_t cPin, uint8_t order)
   return value;
 }
 
-
 /*
  * shiftOut:
  *	Shift data out to a clocked source

wiringPi/wiringShift.h

@@ -33,8 +33,8 @@
 extern "C" {
 #endif
 
-extern uint8_t shiftIn  (uint8_t dPin, uint8_t cPin, uint8_t order) ;
-extern void    shiftOut (uint8_t dPin, uint8_t cPin, uint8_t order, uint8_t val) ;
+extern uint8_t shiftIn      (uint8_t dPin, uint8_t cPin, uint8_t order) ;
+extern void    shiftOut     (uint8_t dPin, uint8_t cPin, uint8_t order, uint8_t val) ;
 
 #ifdef __cplusplus
 }