Updated the build script to better try to detect lack of i2c-dev

(hopefully!)
Also updated all the mmap code in wiringPiSetup() to make it a bit more
sane and efficient to a degree.

People

@@ -13,3 +13,9 @@ Chris McSweeny
     inside the dealyMicrosecondsHard() function.
   And spotting a couple of schoolboy errors in the (experimental)
   softServo code, prompting me to completely re-write it.
+
+Armin (Via projects website)
+  Some pointers about the i2c-dev.h files.
+
+Arno Wagner
+  Suggestions for the mmap calls in wiringPiSetup()

build

@@ -1,5 +1,34 @@
 #!/bin/bash
 
+i2c-install()
+{
+  echo "* wiringPi needs the I2C Development Libraires installing."
+  echo ""
+  echo "If using Debian/Raspbian, then type this command:"
+  echo "  sudo apt-get install libi2c-dev"
+  echo "then run ./build again."
+  echo ""
+  echo "If using another Linux distribution, then you will have to"
+  echo "work out how to install the I2C Developmen Libraries for your"
+  echo "system. (Sorry - I don't know - do let me know though!)"
+  echo ""
+  exit 1
+}
+
+check-make-ok()
+{
+  if [ $? != 0 ]; then
+    echo ""
+    echo "Make Failed..."
+    echo "Please check the messages and fix any problems. If you're still stuck,"
+    echo "then please email all the output and as many details as you can to"
+    echo "  projects@drogon.net"
+    echo ""
+    exit 1
+  fi
+}
+
+
 if [ x$1 = "xclean" ]; then
   echo Cleaning
   echo
@@ -23,32 +52,32 @@ elif [ x$1 = "xuninstall" ]; then
   cd ..
 else
   echo wiringPi Build script - please wait...
-
   echo
+
+# Check for I2C being installed...
+
   if [ ! -f /usr/include/linux/i2c-dev.h ]; then
-    echo "* wiringPi needs the I2C Development Libraires installing."
-    echo ""
-    echo "If using Debian/Raspbian, then type this command:"
-    echo "  sudo apt-get install libi2c-dev"
-    echo "then run ./build again."
-    echo ""
-    echo "If using another Linux distribution, then you will have to"
-    echo "work out how to install the I2C Developmen Libraries for your"
-    echo "system."
-    echo ""
-    exit 1
+    i2c-install
+  fi
+  grep -q i2c_smbus_read_byte /usr/include/linux/i2c-dev.h
+  if [ $? = 1 ]; then
+    i2c-install
   fi
 
   echo "WiringPi library"
   cd wiringPi
   sudo make uninstall
-  make 
+  make
+  check-make-ok
   sudo make install
+  check-make-ok
   echo
   echo "GPIO Utility"
   cd ../gpio
   make
+  check-make-ok
   sudo make install
+  check-make-ok
   echo
   echo "Examples"
   cd ../examples

wiringPi/wiringPi.c

@@ -1161,7 +1161,7 @@ int wiringPiSetup (void)
 {
   int      fd ;
   int      boardRev ;
-  uint8_t *gpioMem, *pwmMem, *clkMem, *padsMem, *timerMem ;
+  //uint8_t *gpioMem, *pwmMem, *clkMem, *padsMem, *timerMem ;
   struct timeval tv ;
 
   if (geteuid () != 0)
@@ -1210,23 +1210,8 @@ int wiringPiSetup (void)
 
 // GPIO:
 
-// Allocate 2 pages - 1 ...
-
-  if ((gpioMem = malloc (BLOCK_SIZE + (PAGE_SIZE-1))) == NULL)
-  {
-    if (wiringPiDebug)
-      fprintf (stderr, "wiringPiSetup: malloc failed: %s\n", strerror (errno)) ;
-    return -1 ;
-  }
-
-// ... presumably to make sure we can round it up to a whole page size
-
-  if (((uint32_t)gpioMem % PAGE_SIZE) != 0)
-    gpioMem += PAGE_SIZE - ((uint32_t)gpioMem % PAGE_SIZE) ;
-
-  gpio = (uint32_t *)mmap((caddr_t)gpioMem, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_FIXED, fd, GPIO_BASE) ;
-
-  if ((int32_t)gpio < 0)
+  gpio = (uint32_t *)mmap(0, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, GPIO_BASE) ;
+  if ((int32_t)gpio == -1)
   {
     if (wiringPiDebug)
       fprintf (stderr, "wiringPiSetup: mmap failed: %s\n", strerror (errno)) ;
@@ -1235,19 +1220,8 @@ int wiringPiSetup (void)
 
 // PWM
 
-  if ((pwmMem = malloc (BLOCK_SIZE + (PAGE_SIZE-1))) == NULL)
-  {
-    if (wiringPiDebug)
-      fprintf (stderr, "wiringPiSetup: pwmMem malloc failed: %s\n", strerror (errno)) ;
-    return -1 ;
-  }
-
-  if (((uint32_t)pwmMem % PAGE_SIZE) != 0)
-    pwmMem += PAGE_SIZE - ((uint32_t)pwmMem % PAGE_SIZE) ;
-
-  pwm = (uint32_t *)mmap(pwmMem, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_FIXED, fd, GPIO_PWM) ;
-
-  if ((int32_t)pwm < 0)
+  pwm = (uint32_t *)mmap(0, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, GPIO_PWM) ;
+  if ((int32_t)pwm == -1)
   {
     if (wiringPiDebug)
       fprintf (stderr, "wiringPiSetup: mmap failed (pwm): %s\n", strerror (errno)) ;
@@ -1256,18 +1230,7 @@ int wiringPiSetup (void)
  
 // Clock control (needed for PWM)
 
-  if ((clkMem = malloc (BLOCK_SIZE + (PAGE_SIZE-1))) == NULL)
-  {
-    if (wiringPiDebug)
-      fprintf (stderr, "wiringPiSetup: clkMem malloc failed: %s\n", strerror (errno)) ;
-    return -1 ;
-  }
-
-  if (((uint32_t)clkMem % PAGE_SIZE) != 0)
-    clkMem += PAGE_SIZE - ((uint32_t)clkMem % PAGE_SIZE) ;
-
-  clk = (uint32_t *)mmap(clkMem, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_FIXED, fd, CLOCK_BASE) ;
-
+  clk = (uint32_t *)mmap(0, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, CLOCK_BASE) ;
   if ((int32_t)clk < 0)
   {
     if (wiringPiDebug)
@@ -1277,18 +1240,7 @@ int wiringPiSetup (void)
  
 // The drive pads
 
-  if ((padsMem = malloc (BLOCK_SIZE + (PAGE_SIZE-1))) == NULL)
-  {
-    if (wiringPiDebug)
-      fprintf (stderr, "wiringPiSetup: padsMem malloc failed: %s\n", strerror (errno)) ;
-    return -1 ;
-  }
-
-  if (((uint32_t)padsMem % PAGE_SIZE) != 0)
-    padsMem += PAGE_SIZE - ((uint32_t)padsMem % PAGE_SIZE) ;
-
-  pads = (uint32_t *)mmap(padsMem, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_FIXED, fd, GPIO_PADS) ;
-
+  pads = (uint32_t *)mmap(0, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, GPIO_PADS) ;
   if ((int32_t)pads < 0)
   {
     if (wiringPiDebug)
@@ -1303,18 +1255,7 @@ int wiringPiSetup (void)
 
 // The system timer
 
-  if ((timerMem = malloc (BLOCK_SIZE + (PAGE_SIZE-1))) == NULL)
-  {
-    if (wiringPiDebug)
-      fprintf (stderr, "wiringPiSetup: timerMem malloc failed: %s\n", strerror (errno)) ;
-    return -1 ;
-  }
-
-  if (((uint32_t)timerMem % PAGE_SIZE) != 0)
-    timerMem += PAGE_SIZE - ((uint32_t)timerMem % PAGE_SIZE) ;
-
-  timer = (uint32_t *)mmap(timerMem, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_FIXED, fd, GPIO_TIMER) ;
-
+  timer = (uint32_t *)mmap(0, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, GPIO_TIMER) ;
   if ((int32_t)timer < 0)
   {
     if (wiringPiDebug)