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/*
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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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}