79 lines
1.3 KiB
C
79 lines
1.3 KiB
C
/*
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main.c
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raspberry pi zero GPIO read test
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For speedup run this example as root, either wis
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sudo ./main
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or by setting the superuser bit:
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sudo chown root:root ./main
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sudo chmod u+s ./main
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <signal.h>
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#include "bcm2835.h"
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#include "raspi_gpio_hal.h"
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void sigtermhandler(int x)
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{
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puts("SIGTERM");
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bcm2835_close();
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exit(0);
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}
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void siginthandler(int x)
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{
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puts("SIGINT");
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bcm2835_close();
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exit(0);
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}
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int main(void)
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{
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int i = 0;
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int pins[4] = { 12, 13, 16, 17 };
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if (!bcm2835_init())
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exit(1);
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signal(SIGTERM, sigtermhandler);
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signal(SIGINT, siginthandler);
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atexit((void (*) (void))bcm2835_close);
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for( i = 0; i < sizeof(pins)/sizeof(*pins); i++ )
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{
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bcm2835_gpio_fsel(pins[i], BCM2835_GPIO_FSEL_INPT);
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//bcm2835_gpio_hen(pins[i]); // high level detect
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}
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for(;;)
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{
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delaynanoseconds(500000000UL);
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printf("%07d ", i);
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for( i = 0; i < sizeof(pins)/sizeof(*pins); i++ )
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{
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printf("%d: %d ", pins[i], bcm2835_gpio_lev(pins[i]));
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}
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puts("");
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/*
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for( i = 0; i < sizeof(pins)/sizeof(*pins); i++ )
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{
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if ( bcm2835_gpio_eds(pins[i]) ) // event detected
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{
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bcm2835_gpio_set_eds(pins[i]); // clear the event
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printf("Event: %d\n", pins[i]);
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}
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}
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*/
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i++;
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}
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} |