gpio.c

The source code example of ARM9 development board from Artila (M-501 starter kit). The source code c

/*
 *	Description: 
 *		example for GPIO.
 *		What is shown in this example:
 *		1. How to open gpio
 *		2. How to get count of GPIO and DIP_SW
 *		3. How to get status of GPIO and DIP_SW
 *
 *
 */
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "matrix500.h"

int main(void)
{
	int gpio, dip_sw, i;
	int fd = open("/dev/gpio",O_RDWR);
	
	/*get count of GPIO*/
	if(ioctl(fd, GPIO_IOCTL_COUNT, &gpio) == 0)
		printf("GPIO count:%d\n",gpio);
	/*get count of DIPSW*/
	if(ioctl(fd, GPIO_IOCTL_DIPSW, &dip_sw) == 0)
		printf("DIP_SW count:%d\n",dip_sw);
	/*show status of GPIO and DIPSW*/
	for(i=0; i<(gpio+dip_sw); i++){
		printf("GPIO%d->%d\n", i,ioctl(fd, GPIO_IOCTL_GET, &i)); 
	}
	
	close(fd);
	return 0;
}