58 lines
1.2 KiB
C
58 lines
1.2 KiB
C
|
// event.c
|
||
|
|
//
|
||
|
|
// Example program for bcm2835 library
|
||
|
|
// Event detection of an input pin
|
||
|
|
//
|
||
|
|
// After installing bcm2835, you can build this
|
||
|
|
// with something like:
|
||
|
|
// gcc -o event event.c -l bcm2835
|
||
|
|
// sudo ./event
|
||
|
|
//
|
||
|
|
// Or you can test it before installing with:
|
||
|
|
// gcc -o event -I ../../src ../../src/bcm2835.c event.c
|
||
|
|
// sudo ./event
|
||
|
|
//
|
||
|
|
// Author: Mike McCauley
|
||
|
|
// Copyright (C) 2011 Mike McCauley
|
||
|
|
// $Id: RF22.h,v 1.21 2012/05/30 01:51:25 mikem Exp $
|
||
|
|
|
||
|
|
#include <bcm2835.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
|
||
|
|
// Input on RPi pin GPIO 15
|
||
|
|
#define PIN RPI_GPIO_P1_15
|
||
|
|
|
||
|
|
int main(int argc, char **argv)
|
||
|
|
{
|
||
|
|
// If you call this, it will not actually access the GPIO
|
||
|
|
// Use for testing
|
||
|
|
// bcm2835_set_debug(1);
|
||
|
|
|
||
|
|
if (!bcm2835_init())
|
||
|
|
return 1;
|
||
|
|
|
||
|
|
// Set RPI pin P1-15 to be an input
|
||
|
|
bcm2835_gpio_fsel(PIN, BCM2835_GPIO_FSEL_INPT);
|
||
|
|
// with a pullup
|
||
|
|
bcm2835_gpio_set_pud(PIN, BCM2835_GPIO_PUD_UP);
|
||
|
|
// And a low detect enable
|
||
|
|
bcm2835_gpio_len(PIN);
|
||
|
|
|
||
|
|
while (1)
|
||
|
|
{
|
||
|
|
if (bcm2835_gpio_eds(PIN))
|
||
|
|
{
|
||
|
|
// Now clear the eds flag by setting it to 1
|
||
|
|
bcm2835_gpio_set_eds(PIN);
|
||
|
|
printf("low event detect for pin 15\n");
|
||
|
|
}
|
||
|
|
|
||
|
|
// wait a bit
|
||
|
|
delay(500);
|
||
|
|
}
|
||
|
|
|
||
|
|
bcm2835_close();
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|