keytest.c~

uclinux底下的按键驱动 本人已经调试通过

/****************************************Copyright (c)**************************************************
**                               FREE
**
**--------------File Info-------------------------------------------------------------------------------
** File Name: led.c
** Last modified Date:  2006-9-9
** Last Version: 1.0
** Descriptions: User Configurable File
**
**------------------------------------------------------------------------------------------------------
** Created By: ZLG CHENMINGJI
** Created date:   2006-9-9
** Version: 1.0
** Descriptions: First version
**
**------------------------------------------------------------------------------------------------------
** Modified by:MAMAJINCO
** Modified date:2006-9-9
** Version:1.0
** Descriptions:在此忠心感谢ZLG的模版 我的高质量编程意识起源于此
**
********************************************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>

#define read 0

void delay(int delay)
{
	int i;
	for(;delay>0;delay--)
	{
		for(i=0 ; i < 5000 ; i ++);
		
	}
}

int main()
{
	int fd1;
	unsigned char keytemp=0x0f;
        unsigned char count=0;
  
	fd1= open("/dev/key" , O_RDWR);  //打开设备
	if(fd1 == -1)
	{
		printf ( "open file failed" );
		return -1;
	}
	
        printf("open success!\n");
        
  //ioctl(fd1,read,&keytemp);  //读出按键状态
  while(count!=10)
  {	
        ioctl(fd1,read,&keytemp);  //读出按键状态	
	if((keytemp&0x0f)!=0x0f)
	{
		keytemp=0x0f;   //清数
		delay(100);   //去抖动
		ioctl(fd1,read,&keytemp);  //读出按键状态
		if((keytemp&0x0f)!=0x0f)
		 {
		 	 count++;
		 	 switch(keytemp&0x0f)                        //确实有键按下
		 	 {
		 	 	  case 0x0e:
		 	 	  	       printf("key0 is down!\n");
		 	 	  	       break;
		 	 	  case 0x0d:
		 	 	  	       printf("key1 is down!\n");
		 	 	  	       break;	    
		 	 	  case 0x0b:
		 	 	  	       printf("key2 is down!\n");
		 	 	  	       break;  
		 	 	  case 0x07:
		 	 	  	       printf("key3 is down!\n");
		 	 	  	       break;	        
		 	 	}
		 }
		
		}
	}
	close (fd1);
	return 0;
		
}