ledshow.c

来自「一个linux 2.6内核下的完整的字符驱动实例」· C语言 代码 · 共 37 行

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "stdio.h"
#include "sys/types.h"
#include "sys/ioctl.h"
#include "stdlib.h"
#include "termios.h"
#include "sys/stat.h"
#include "fcntl.h"
#include "sys/time.h"

int main()
{
	int on=1;
	int led;
	int fd;
	fd = open("/dev/leds", 0);
	if (fd < 0) {
		            perror("open device leds");
		              exit(1);
	                }
	printf("leds test show. press ctrl+c to exit  \n");
	while(1)
		{
		   for(led=0;led<5;led++)
		   	{
		         ioctl(fd, on, led);
				 usleep(50000);
		   	}
		   on=!on;
		}	  
	close(fd);
	return 0;
}