test.c

linux环境下编写的ARM的led驱动程序

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>

#define CMD_TC_PERIOD  0
#define CMD_LED_ON     1
#define CMD_LED_OFF    2
#define CMD_INT_ON     3
#define CMD_INT_OFF    4
 
int main(int argc, char **argv)
{
    int fd;
    int period;
    if((fd=open("/dev/led",O_RDWR))==-1)
       {
        perror("open error");
        exit(1);
       }
    ioctl(fd,CMD_INT_OFF);
    period=atoi(argv[1]);
    ioctl(fd,CMD_TC_PERIOD,&period);
    ioctl(fd,CMD_INT_ON);
    while(1)
    {
     ioctl(fd,CMD_LED_OFF);
    }  
    close(fd);
    return 0;
}