test_led.c

一个LED的简单驱动程序 与测试程序。

#include <stdio.h>
#include <sys/time.h>
#include <time.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>

#define LED_IOCTL_BASE	0xbb
#define LED_LIGHT		_IOR(LED_IOCTL_BASE, 1, unsigned long)
#define LED_UNLIGHT	_IOR(LED_IOCTL_BASE, 2, unsigned long)
#define LED_WINK		_IOR(LED_IOCTL_BASE, 3, unsigned long)

int main(int argc,char *argv[])
{
	int fd;
	int cmd;
	int seconds=0;
	
	if(argc<2)
	{
		printf("please input a parameter\n");
		return 0;
	}
	seconds=atoi(argv[1]);
	
	fd=open("/dev/test_leddrv",O_RDWR);
	if (fd < 0)
	{
		printf("Can't open device file /dev/test_leddrv!\n");
		return 0;
	}
	printf("please input your cmd:\n");
	printf("1:lighting\t2:unlinghting\t3:winking\n");
	scanf("%d",&cmd);  
	switch(cmd)
	{
		case 1:
			{
				while(1)
				{
					ioctl(fd, LED_LIGHT);
				}
			}
			break;
		case 2:
			{
				while(1)
				{
				  ioctl(fd, LED_UNLIGHT);
			  }
			}
		case 3:
			{
				while(seconds)
  			{
     			ioctl(fd, LED_WINK);
     			sleep(1);
  			}
  		}
  		break;
  	default:
  		{
  			printf("your input error!\n");
  		} 
  		break; 		
	}
 	close(fd);
  return 1;
}