Lots of changes here. Added new I2C test code, a new serialTest program,

and developed the new ISR - Interrupt Service Routine
handler - much easier than the old waitForInterrupt code!

Minor tweaks to the gpio program to recognise the environment variable
WIRINGPI_DEBUG too, and removed the printing of the errors from the
main wiringPi setup routines (and added some new ones!)

gpio/Makefile

@@ -30,7 +30,7 @@ INCLUDE	= -I/usr/local/include
 CFLAGS	= $(DEBUG) -Wall $(INCLUDE) -Winline -pipe
 
 LDFLAGS	= -L/usr/local/lib
-LIBS    = -lwiringPi
+LIBS    = -lwiringPi -lpthread
 
 # May not need to  alter anything below this line
 ###############################################################################

gpio/gpio.1

@@ -57,6 +57,9 @@ converters on the Gertboard. It's designed for simple testing and
 diagnostic purposes, but can be used in shell scripts for general if
 somewhat slow control of the GPIO pins.
 
+It can also control the IO's on the PiFace IO board and load the SPI and I2C
+kernel modules if required.
+
 Additionally, it can be used to set the exports in the \fI/sys/class/gpio\fR
 system directory to allow subsequent programs to use the \fR/sys/class/gpio\fR
 interface without needing to be run as root.
@@ -70,6 +73,8 @@ 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 
+export and edge commands.
 
 .TP
 .B \-p
@@ -183,7 +188,7 @@ SPI digital to analogue converter.
 The board jumpers need to be in-place to do this operation.
 
 
-.SH "WiringPi vs. GPIO Pin numbering"
+.SH "WiringPi vs. BCM_GPIO Pin numbering"
 
 .PP
 .TS
@@ -213,6 +218,12 @@ _
 20	-	31
 .TE
 
+Note that "r1" and "r2" above refers to the board revision. Normally
+wiringPi detects the correct board revision with use for it's own
+numbering scheme, but if you are using a Revision 2 board with some
+of the pins which change numbers between revisions you will need
+to alter your software.
+
 .SH FILES
 
 .TP 2.2i

gpio/gpio.c

@@ -35,12 +35,14 @@
 #include <wiringPi.h>
 #include <gertboard.h>
 
+extern int wiringPiDebug ;
+
 #ifndef TRUE
 #  define	TRUE	(1==1)
 #  define	FALSE	(1==2)
 #endif
 
-#define	VERSION	"1.5"
+#define	VERSION	"1.6"
 
 static int wpMode ;
 
@@ -127,7 +129,7 @@ static int moduleLoaded (char *modName)
 
 static void _doLoadUsage (char *argv [])
 {
-  fprintf (stderr, "Usage: %s load <spi/i2c>\n", argv [0]) ;
+  fprintf (stderr, "Usage: %s load <spi/i2c> [bufferSize in KB for spi]\n", argv [0]) ;
   exit (1) ;
 }
 
@@ -136,16 +138,24 @@ static void doLoad (int argc, char *argv [])
   char *module1, *module2 ;
   char cmd [80] ;
   char *file1, *file2 ;
+  char spiBuf [32] ;
 
-  if (argc != 3)
+  if (argc < 3)
     _doLoadUsage (argv) ;
 
+  spiBuf [0] = 0 ;
+
   /**/ if (strcasecmp (argv [2], "spi") == 0)
   {
     module1 = "spidev" ;
     module2 = "spi_bcm2708" ;
     file1  = "/dev/spidev0.0" ;
     file2  = "/dev/spidev0.1" ;
+    if (argc == 4)
+      sprintf (spiBuf, " bufsize=%d", atoi (argv [3]) * 1024) ;
+    else if (argc > 4)
+      _doLoadUsage (argv) ;
+    
   }
   else if (strcasecmp (argv [2], "i2c") == 0)
   {
@@ -159,7 +169,7 @@ static void doLoad (int argc, char *argv [])
 
   if (!moduleLoaded (module1))
   {
-    sprintf (cmd, "modprobe %s", module1) ;
+    sprintf (cmd, "modprobe %s%s", module1, spiBuf) ;
     system (cmd) ;
   }
 
@@ -848,6 +858,12 @@ int main (int argc, char *argv [])
 {
   int i ;
 
+  if (getenv ("WIRINGPI_DEBUG") != NULL)
+  {
+    printf ("gpio: wiringPi debug mode enabled\n") ;
+    wiringPiDebug = TRUE ;
+  }
+
   if (argc == 1)
   {
     fprintf (stderr, "%s\n", usage) ;