test_led.c

来自「本程序为嵌入式linux驱动」· C语言 代码 · 共 41 行

#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/mman.h>
#include "gpio_test.h"
#define DEVICE_GPIODRV	"/tmp/led"
int main()
{
	int fd;
	int val=-1;
	
	if((fd=open(DEVICE_GPIODRV,O_RDONLY | O_NONBLOCK))<0)
	{
		printf("open device: %s\n",DEVICE_GPIODRV);
		perror("can not open device");
		exit(1);
	}
	while(1){
		printf("0:set ,1:clear,2: quit        :");
		scanf("%d",&val);
		if(val==0)
			ioctl(fd,IOWRITE,0);
		else if(val==1)
			ioctl(fd,IOCLEAR,0);
		else if(val==2){
			close(fd);
			return 0;
		}else{
			printf("val is %d\n",val);
			continue;
		}
			
	}
	return 0;
}