ledapp.c

基于AT91RM9200的led驱动及应用程序

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <termios.h>
#include <stdlib.h>
#include <errno.h>
#include <getopt.h>
#include "ledapp.h"

int fd_led;
int open_led(void)
{ 
	fd_led = open("/dev/led", O_RDWR);
	if(fd_led < 0)
	{
		printf("led open fail!\n");
		return -1;
	}
	return 0;
}

void led_off(void)
{
	open_led();
	ioctl(fd_led, CMD_LED_OFF);
	close(fd_led);
}

void led_on(void)
{
	open_led();
	ioctl(fd_led, CMD_LED_ON);
	close(fd_led);
}

void led_change(void)
{
	open_led();
	ioctl(fd_led, CMD_LED_CHANGE);
	close(fd_led);
}

int Usage(int status) 
{
	FILE   *fp;
	static char version[] = "\nledapp V1.0 \n";
	static char copyright[] = "copyright (C) 2007---2009 CK [e-mail]\n";
	fp = (status == EXIT_SUCCESS) ? stdout : stderr; 
	fprintf(fp, version);
	fprintf(fp, copyright);
	fprintf(fp, "usage: ledapp -c change -f off -n on\n\n");
	exit(status);
}

int main(int argc,char *argv[])
{
	int ch;
	while((ch = getopt(argc,argv, "cfn"))!= -1)
	{
		switch(ch)
		{
			case 'c':
				led_change();
				break;
			case 'f':
				led_off();
				break;
			case 'n':
				led_on();
				break;
			default:
				Usage(EXIT_SUCCESS);
				break;
		} 
	}
	return 0;
}