Updated the GPIO command to add in new features for PWM

Updated wiringPi to add new PWM controls.

gpio/Makefile

@@ -41,7 +41,7 @@ OBJ	=	gpio.o
 
 all:		gpio
 
-gpio:	gpio.o
+gpio:	gpio.o /usr/local/lib/libwiringPi.a
 	@echo [LD]
 	@$(CC) -o $@ gpio.o $(LDFLAGS) $(LIBS)
 	

gpio/gpio.1

@@ -4,20 +4,38 @@
 gpio \- Command-line access to Raspberry Pi and PiFace GPIO
 
 .SH SYNOPSIS
-.TP
 .B gpio
-.RB [ \-v ]
-.TP
+.B \-v
+.PP
 .B gpio
-.RB [ \-g ]
-.RB < read/write/pwm/mode ...>
-.TP
+.B [ \-g ]
+.B read/write/pwm/mode ...
+.PP
 .B gpio
-.RB [ \-p ]
-.RB < read/write/mode ...>
-.TP
+.B [ \-p ]
+.B read/write/mode
+.B ...
+.PP
+.B gpio
+.B unexportall/exports
+.PP
+.B gpio
+.B export/edge/unexport
+.B ...
+.PP
+.B gpio
+.B drive
+group value
+.PP
+.B gpio
+.B pwm-bal/pwm-ms
+.PP
+.B gpio
+.B pwmr
+range
+.PP
 .B gpio
-.RB < export/edge/unexport/unexportall/exports ...>
+.B load \ i2c/spi
 
 .SH DESCRIPTION
 
@@ -65,6 +83,14 @@ use the literals \fIup\fR, \fIdown\fR or \fItri\fR to set the internal
 pull-up, pull-down or tristate (off) controls.
 
 .TP
+.B unexportall
+Un-Export all the GPIO pins in the /sys/class/gpio directory.
+
+.TP
+.B exports
+Print a list (if any) of all the exported GPIO pins and their current values.
+
+.TP
 .B export
 Export a GPIO pin in the \fI/sys/class/gpio\fR directory. Use like the
 mode command above however only \fIin\fR and \fIout\fR are supported at
@@ -96,12 +122,26 @@ requiring root/sudo.
 Un-Export a GPIO pin in the /sys/class/gpio directory.
 
 .TP
-.B unexportall
-Un-Export all the GPIO pins in the /sys/class/gpio directory.
+.B drive
+group value
+
+Change the pad driver value for the given pad group to the supplied drive
+value. Group is 0, 1 or 2 and value is 0-7. Do not use unless you are
+absolutely sure you know what you're doing.
 
 .TP
-.B exports
-Print a list (if any) of all the exported GPIO pins and their current values.
+.B pwm-bal/pwm-ms 
+Change the PWM mode to balanced (the default) or mark:space ratio (traditional)
+
+.TP
+.B pwmr
+Change the PWM range register. The default is 1024.
+
+.TP
+.B load i2c/spi
+This loads the i2c or the spi drivers into the system and changes the permissions on
+the associated /dev/ entries so that the current user has access to them.
+
 
 .SH "WiringPi vs. GPIO Pin numbering"
 
@@ -170,7 +210,7 @@ Gordon Henderson
 
 .SH "REPORTING BUGS"
 
-Report bugs to <gordon@drogon.net>
+Report bugs to <projects@drogon.net>
 
 .SH COPYRIGHT
 

gpio/gpio.c

@@ -46,6 +46,8 @@ char *usage = "Usage: gpio -v\n"
               "       gpio [-p] <read/write/mode> ...\n"
 	      "       gpio export/edge/unexport/unexportall/exports ...\n"
 	      "       gpio drive <group> <value>\n"
+	      "       gpio pwm-bal/pwm-ms \n"
+	      "       gpio pwmr <range> \n"
 	      "       gpio load spi/i2c" ;
 
 
@@ -487,18 +489,12 @@ void doMode (int argc, char *argv [])
 
   mode = argv [3] ;
 
-  /**/ if (strcasecmp (mode, "in")   == 0)
-    pinMode (pin, INPUT) ;
-  else if (strcasecmp (mode, "out")  == 0)
-    pinMode (pin, OUTPUT) ;
-  else if (strcasecmp (mode, "pwm")  == 0)
-    pinMode (pin, PWM_OUTPUT) ;
-  else if (strcasecmp (mode, "up")   == 0)
-    pullUpDnControl (pin, PUD_UP) ;
-  else if (strcasecmp (mode, "down") == 0)
-    pullUpDnControl (pin, PUD_DOWN) ;
-  else if (strcasecmp (mode, "tri") == 0)
-    pullUpDnControl (pin, PUD_OFF) ;
+  /**/ if (strcasecmp (mode, "in")   == 0) pinMode         (pin, INPUT) ;
+  else if (strcasecmp (mode, "out")  == 0) pinMode         (pin, OUTPUT) ;
+  else if (strcasecmp (mode, "pwm")  == 0) pinMode         (pin, PWM_OUTPUT) ;
+  else if (strcasecmp (mode, "up")   == 0) pullUpDnControl (pin, PUD_UP) ;
+  else if (strcasecmp (mode, "down") == 0) pullUpDnControl (pin, PUD_DOWN) ;
+  else if (strcasecmp (mode, "tri")  == 0) pullUpDnControl (pin, PUD_OFF) ;
   else
   {
     fprintf (stderr, "%s: Invalid mode: %s. Should be in/out/pwm/up/down/tri\n", argv [1], mode) ;
@@ -630,6 +626,39 @@ void doPwm (int argc, char *argv [])
 
 
 /*
+ * doPwmMode: doPwmRange:
+ *	Change the PWM mode and Range values
+ *********************************************************************************
+ */
+
+static void doPwmMode (int mode)
+{
+  pwmSetMode (mode) ;
+}
+
+static void doPwmRange (int argc, char *argv [])
+{
+  unsigned int range ;
+
+  if (argc != 3)
+  {
+    fprintf (stderr, "Usage: %s pwmr <range>\n", argv [0]) ;
+    exit (1) ;
+  }
+
+  range = (unsigned int)strtoul (argv [2], NULL, 10) ;
+
+  if (range == 0)
+  {
+    fprintf (stderr, "%s: range must be > 0\n", argv [0]) ;
+    exit (1) ;
+  }
+
+  pwmSetRange (range) ;
+}
+
+
+/*
  * main:
  *	Start here
  *********************************************************************************
@@ -734,18 +763,22 @@ int main (int argc, char *argv [])
     wpMode = WPI_MODE_PINS ;
   }
 
+// Check for PWM operations
+
+  if (wpMode != WPI_MODE_PIFACE)
+  {
+    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 ; }
+  }
+
 // Check for wiring commands
 
-  /**/ if (strcasecmp (argv [1], "write"   ) == 0)
-    doWrite  (argc, argv) ;
-  else if (strcasecmp (argv [1], "read"    ) == 0)
-    doRead   (argc, argv) ;
-  else if (strcasecmp (argv [1], "mode"    ) == 0)
-    doMode   (argc, argv) ;
-  else if (strcasecmp (argv [1], "pwm"     ) == 0)
-    doPwm    (argc, argv) ;
-  else if (strcasecmp (argv [1], "drive"   ) == 0)
-    doPadDrive (argc, argv) ;
+  /**/ if (strcasecmp (argv [1], "write"   ) == 0) doWrite    (argc, argv) ;
+  else if (strcasecmp (argv [1], "read"    ) == 0) doRead     (argc, argv) ;
+  else if (strcasecmp (argv [1], "mode"    ) == 0) doMode     (argc, argv) ;
+  else if (strcasecmp (argv [1], "pwm"     ) == 0) doPwm      (argc, argv) ;
+  else if (strcasecmp (argv [1], "drive"   ) == 0) doPadDrive (argc, argv) ;
   else
   {
     fprintf (stderr, "%s: Unknown command: %s. (read/write/pwm/mode/drive expected)\n", argv [0], argv [1]) ;

wiringPi/wiringPi.c

@@ -79,6 +79,8 @@ void (*setPadDrive)       (int group, int value) ;
 int  (*digitalRead)       (int pin) ;
 int  (*waitForInterrupt)  (int pin, int mS) ;
 void (*delayMicroseconds) (unsigned int howLong) ;
+void (*pwmSetMode)        (int mode) ;
+void (*pwmSetRange)       (unsigned int range) ;
 
 
 #ifndef	TRUE
@@ -377,22 +379,25 @@ void pinModeGpio (int pin, int mode)
     if (!pwmRunning)
     {
 
+      *(pwm + PWM_CONTROL) = 0 ;			// Stop PWM
+      delayMicroseconds (10) ;
+	
 //	Gert/Doms Values
-      *(clk + PWMCLK_DIV)  = BCM_PASSWORD | (32<<12) ;	// set pwm div to 32 (19.2/3 = 600KHz)
+      *(clk + PWMCLK_DIV)  = BCM_PASSWORD | (32<<12) ;	// set pwm div to 32 (19.2/32 = 600KHz)
       *(clk + PWMCLK_CNTL) = BCM_PASSWORD | 0x11 ;	// Source=osc and enable
-      digitalWrite (pin, LOW) ;
-      *(pwm + PWM_CONTROL) = 0 ;			// Disable PWM
-      delayMicroseconds (10) ;
-      *(pwm + PWM0_RANGE) = 0x400 ;
-      delayMicroseconds (10) ;
-      *(pwm + PWM1_RANGE) = 0x400 ;
+
       delayMicroseconds (10) ;
 
+      *(pwm + PWM0_RANGE) = 0x400 ; delayMicroseconds (10) ;
+      *(pwm + PWM1_RANGE) = 0x400 ; delayMicroseconds (10) ;
+
 // Enable PWMs
 
       *(pwm + PWM0_DATA) = 512 ;
       *(pwm + PWM1_DATA) = 512 ;
 
+// Balanced mode (default)
+
       *(pwm + PWM_CONTROL) = PWM0_ENABLE | PWM1_ENABLE ;
 
       pwmRunning = TRUE ;
@@ -423,6 +428,38 @@ void pinModeSys (int pin, int mode)
 }
 
 
+/*
+ * pwmControl:
+ *	Allow the user to control some of the PWM functions
+ *********************************************************************************
+ */
+
+void pwmSetModeWPi (int mode)
+{
+  if (mode == PWM_MODE_MS)
+    *(pwm + PWM_CONTROL) = PWM0_ENABLE | PWM1_ENABLE | PWM0_MS_MODE | PWM1_MS_MODE ;
+  else
+    *(pwm + PWM_CONTROL) = PWM0_ENABLE | PWM1_ENABLE ;
+}
+
+void pwmSetModeSys (int mode)
+{
+  return ;
+}
+
+
+void pwmSetRangeWPi (unsigned int range)
+{
+  *(pwm + PWM0_RANGE) = range ; delayMicroseconds (10) ;
+  *(pwm + PWM1_RANGE) = range ; delayMicroseconds (10) ;
+}
+
+void pwmSetRangeSys (unsigned int range)
+{
+  return ;
+}
+
+
 #ifdef notYetReady
 /*
  * pinED01:
@@ -774,6 +811,8 @@ int wiringPiSetup (void)
         digitalRead =       digitalReadWPi ;
    waitForInterrupt =  waitForInterruptWPi ;
   delayMicroseconds = delayMicrosecondsWPi ;
+         pwmSetMode =        pwmSetModeWPi ;
+        pwmSetRange =       pwmSetRangeWPi ;
   
 // Open the master /dev/memory device
 
@@ -928,6 +967,8 @@ int wiringPiSetupGpio (void)
         digitalRead =       digitalReadGpio ;
    waitForInterrupt =  waitForInterruptGpio ;
   delayMicroseconds = delayMicrosecondsWPi ;	// Same
+         pwmSetMode =        pwmSetModeWPi ;
+        pwmSetRange =       pwmSetRangeWPi ;
 
   return 0 ;
 }
@@ -956,6 +997,9 @@ int wiringPiSetupSys (void)
         digitalRead =       digitalReadSys ;
    waitForInterrupt =  waitForInterruptSys ;
   delayMicroseconds = delayMicrosecondsSys ;
+         pwmSetMode =        pwmSetModeSys ;
+        pwmSetRange =       pwmSetRangeSys ;
+
 
 // Open and scan the directory, looking for exported GPIOs, and pre-open
 //	the 'value' interface to speed things up for later

wiringPi/wiringPi.h

@@ -41,6 +41,12 @@
 #define	PUD_DOWN	 1
 #define	PUD_UP		 2
 
+// PWM
+
+#define	PWM_MODE_MS	0
+#define	PWM_MODE_BAL	1
+
+
 // Function prototypes
 //	c++ wrappers thanks to a commend by Nick Lott
 //	(and others on the Raspberry Pi forums)
@@ -65,6 +71,8 @@ extern void (*pwmWrite)          (int pin, int value) ;
 extern void (*setPadDrive)       (int group, int value) ;
 extern int  (*digitalRead)       (int pin) ;
 extern void (*delayMicroseconds) (unsigned int howLong) ;
+extern void (*pwmSetMode)        (int mode) ;
+extern void (*pwmSetRange)       (unsigned int range) ;
 
 // Interrupts