bcm2835
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Examples
input.c
Reads the state of an RPi input pin
// input.c
//
// Example program for bcm2835 library
// Reads and prints the state of an input pin
//
// After installing bcm2835, you can build this
// with something like:
// gcc -o input input.c -l bcm2835
// sudo ./input
//
// Or you can test it before installing with:
// gcc -o input -I ../../src ../../src/bcm2835.c input.c
// sudo ./input
//
// 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
);
// Blink
while
(1)
{
// Read some data
uint8_t value =
bcm2835_gpio_lev
(PIN);
printf(
"read from pin 15: %d\n"
, value);
// wait a bit
delay(500);
}
bcm2835_close
();
return
0;
}
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