test_led.c

来自「基于linux操作系统ATMELARM9200 开发平台的LED演示程序」· C语言 代码 · 共 61 行

/* (C) Copyright 2004,12
 * 
 * himai
 * All rights left.
 *
 *
 * led test application
 *
 *
 * $Id: led_test.c, v 1.2 2004/12/16  $
 *
 ***********************************************************************/
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

main()
{
	int testdev,num=10;
	int err;
        int led_data;        

	char buf[2] = {0xFF,0xFF};
	char buf2[2] = {0x0,0x0};

	testdev = open("/dev/ut_led",O_RDWR);

	if ( testdev < 0  )
	{
		printf("Cann't open file testdev=0x%08X\n",testdev);
		exit(0);
	}


	while(num)
	{
		led_data = 0xffffffff;

		err = write(testdev, &led_data, 4);
		if(4 != err )
                {
			printf("write error: %d\n",err);
                }
		sleep(1);

		led_data = 0x0;
		err = write(testdev, &led_data, 4);
		if(4 != err )
		{
			printf("write error: %d\n",err);
		}
		sleep(1);
                /*num--;*/
	}

	close(testdev);
}