main.c

基于ARM9的LINUX下的按键驱动程序

/*
****************************************Copyright (c)**************************************************
**                               Guangzhou Zhiyuan Electronic Co.,LTD.
**                                     graduate school
**                                 http://www.zyinside.com
**
**------------------------------------- File Info ------------------------------------------------------
** File name:           main.c
** Last modified Date:  2005-12-28
** Last Version:        1.0
** Descriptions:        Test program for KEY1's driver.
**------------------------------------------------------------------------------------------------------
** Created by:          Chenxibing
** Created date:        2005-12-27
** Version:             1.0
** Descriptions:        Preliminary version.
**
**------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
** Version:
** Descriptions:
**
********************************************************************************************************
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
//#include <sys/time.h>
//#include <sys/stat.h>

/*
*******************************************************************************************************
** Function name: main()
** Descriptions	: Read KEY's value and Pressed times.
** Input	: NONE
** Output	: NONE
** Created by	: Chenxibing
** Created Date	: 2005-12-27
**-----------------------------------------------------------------------------------------------------
** Modified by	:
** Modified Date: 
**-----------------------------------------------------------------------------------------------------
*******************************************************************************************************
*/
int main(int argc, char **argv)
{
	int fd;
	int result;
	int key_value;
	int times = 1;

	fd = open("/dev/magic-key", 0);
	if (fd < 0)
	{
		perror("Failed to open magic-key\n");
		exit(1);
	}
	
	while(times < 10)
	{

		result = read(fd, &key_value, sizeof(key_value)) == sizeof(key_value);
		if (!result)
		{
			if (errno == EINVAL)
				printf("Wrong size!\n");
			goto exit;	
		}
		printf("KEY1's value is %d ;", key_value);
		printf(" Be pressed %d times\n", times++);
	}
exit:
	close(fd);
	return 0;
}