Added comments to RPi interrupt files.

utility/RPi/interrupt.c

@@ -1,3 +1,12 @@
+/*
+Interrupts functions extruded from wiringPi library by Oitzu.
+
+wiringPi Copyright (c) 2012 Gordon Henderson
+https://projects.drogon.net/raspberry-pi/wiringpi
+wiringPi is free software: GNU Lesser General Public License
+see <http://www.gnu.org/licenses/>
+*/
+
 #include <stdio.h>
 #include <unistd.h>
 #include <fcntl.h>

utility/RPi/interrupt.h

@@ -1,5 +1,10 @@
 /*
 Interrupts functions extruded from wiringPi library by Oitzu.
+
+wiringPi Copyright (c) 2012 Gordon Henderson
+https://projects.drogon.net/raspberry-pi/wiringpi
+wiringPi is free software: GNU Lesser General Public License
+see <http://www.gnu.org/licenses/>
 */
 
 #include "RF24_arch_config.h"
@@ -9,13 +14,43 @@ Interrupts functions extruded from wiringPi library by Oitzu.
 #define INT_EDGE_RISING 2
 #define INT_EDGE_BOTH 3
 
+/*
+ * interruptHandler:
+ * This is a thread and gets started to wait for the interrupt we're
+ * hoping to catch. It will call the user-function when the interrupt
+ * fires.
+ *********************************************************************************
+ */
 static void *interruptHandler (void *arg);
 
 #ifdef __cplusplus
 extern "C" {
 #endif
+/*
+ * waitForInterrupt:
+ * Pi Specific.
+ * Wait for Interrupt on a GPIO pin.
+ * This is actually done via the /sys/class/gpio interface regardless of
+ * the wiringPi access mode in-use. Maybe sometime it might get a better
+ * way for a bit more efficiency.
+ *********************************************************************************
+ */
 extern int waitForInterrupt (int pin, int mS);
+
+/*
+ * piHiPri:
+ * Attempt to set a high priority schedulling for the running program
+ *********************************************************************************
+ */
 extern int piHiPri (const int pri);
+
+/*
+ * attachInterrupt (Original: wiringPiISR):
+ * Pi Specific.
+ * Take the details and create an interrupt handler that will do a call-
+ * back to the user supplied function.
+ *********************************************************************************
+ */
 extern int attachInterrupt (int pin, int mode, void (*function)(void));
 #ifdef __cplusplus
 }