111 lines
3.2 KiB
C
111 lines
3.2 KiB
C
/*
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* isr.c:
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* Wait for Interrupt test program - ISR method
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*
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* How to test:
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* Use the SoC's pull-up and pull down resistors that are avalable
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* on input pins. So compile & run this program (via sudo), then
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* in another terminal:
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* gpio mode 0 up
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* gpio mode 0 down
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* at which point it should trigger an interrupt. Toggle the pin
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* up/down to generate more interrupts to test.
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*
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* Copyright (c) 2013 Gordon Henderson.
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***********************************************************************
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* This file is part of wiringPi:
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* https://projects.drogon.net/raspberry-pi/wiringpi/
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*
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* wiringPi is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* wiringPi is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
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***********************************************************************
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*/
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <wiringPi.h>
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// globalCounter:
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// Global variable to count interrupts
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// Should be declared volatile to make sure the compiler doesn't cache it.
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static volatile int globalCounter [8] ;
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/*
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* myInterrupt:
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*********************************************************************************
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*/
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void myInterrupt0 (void) { ++globalCounter [0] ; }
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void myInterrupt1 (void) { ++globalCounter [1] ; }
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void myInterrupt2 (void) { ++globalCounter [2] ; }
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void myInterrupt3 (void) { ++globalCounter [3] ; }
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void myInterrupt4 (void) { ++globalCounter [4] ; }
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void myInterrupt5 (void) { ++globalCounter [5] ; }
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void myInterrupt6 (void) { ++globalCounter [6] ; }
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void myInterrupt7 (void) { ++globalCounter [7] ; }
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/*
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*********************************************************************************
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* main
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*********************************************************************************
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*/
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int main (void)
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{
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int gotOne, pin ;
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int myCounter [8] ;
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for (pin = 0 ; pin < 8 ; ++pin)
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globalCounter [pin] = myCounter [pin] = 0 ;
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wiringPiSetup () ;
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wiringPiISR (0, INT_EDGE_FALLING, &myInterrupt0) ;
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wiringPiISR (1, INT_EDGE_FALLING, &myInterrupt1) ;
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wiringPiISR (2, INT_EDGE_FALLING, &myInterrupt2) ;
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wiringPiISR (3, INT_EDGE_FALLING, &myInterrupt3) ;
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wiringPiISR (4, INT_EDGE_FALLING, &myInterrupt4) ;
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wiringPiISR (5, INT_EDGE_FALLING, &myInterrupt5) ;
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wiringPiISR (6, INT_EDGE_FALLING, &myInterrupt6) ;
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wiringPiISR (7, INT_EDGE_FALLING, &myInterrupt7) ;
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for (;;)
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{
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gotOne = 0 ;
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printf ("Waiting ... ") ; fflush (stdout) ;
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for (;;)
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{
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for (pin = 0 ; pin < 8 ; ++pin)
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{
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if (globalCounter [pin] != myCounter [pin])
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{
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printf (" Int on pin %d: Counter: %5d\n", pin, globalCounter [pin]) ;
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myCounter [pin] = globalCounter [pin] ;
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++gotOne ;
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}
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}
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if (gotOne != 0)
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break ;
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}
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}
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return 0 ;
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}
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