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isr.c
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isr.c
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/*
* 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 < 4 ; ++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 ;
}