S3C2440关开LED灯

/*************************************

NAME:leds.c
COPYRIGHT:

*************************************/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>

int main(int argc, char **argv)
{
        int on;
        int led_no;
        int fd;
        if (argc != 3 || sscanf(argv[1], "%d", &led_no) != 1 || sscanf(argv[2],"%d", &on) != 1 ||
            on < 0 || on > 1 || led_no < 1 || led_no > 4) {
                fprintf(stderr, "Usage: leds led_no 0|1\n");
                exit(1);
        }
        fd = open("/dev/GPIO-Control", 0);
        if (fd < 0) {
                perror("open device leds");
                exit(1);
        }
        ioctl(fd, on, (led_no-1));
        close(fd);
        return 0;
}

 

2、

用法：

Usage: leds led_no 0|1
[root@EmbedSky /]# ./leds 1 0     //1号灯灭
[root@EmbedSky /]# ./leds 2 0
[root@EmbedSky /]# ./leds 3 0
[root@EmbedSky /]# ./leds 4 0
[root@EmbedSky /]# ./leds 4 1     //4号灯亮

[root@EmbedSky /]# ./leds 3 1