initial cleanup and mapping

examples/isr.c

@@ -0,0 +1,110 @@
+/*
+ * isr.c:
+ *	Wait for Interrupt test program - ISR method
+ *
+ *	How to test:
+ *	  Use the SoC's pull-up and pull down resistors that are avalable
+ *	on input pins. So compile & run this program (via sudo), then
+ *	in another terminal:
+ *		gpio mode 0 up
+ *		gpio mode 0 down
+ *	at which point it should trigger an interrupt. Toggle the pin
+ *	up/down to generate more interrupts to test.
+ *
+ * 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 <string.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <wiringPi.h>
+
+
+// globalCounter:
+//	Global variable to count interrupts
+//	Should be declared volatile to make sure the compiler doesn't cache it.
+
+static volatile int globalCounter [8] ;
+
+
+/*
+ * myInterrupt:
+ *********************************************************************************
+ */
+
+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] ; }
+
+
+/*
+ *********************************************************************************
+ * main
+ *********************************************************************************
+ */
+
+int main (void)
+{
+  int gotOne, pin ;
+  int myCounter [8] ;
+
+  for (pin = 0 ; pin < 8 ; ++pin) 
+    globalCounter [pin] = myCounter [pin] = 0 ;
+
+  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) ;
+
+    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 ;
+}