单片机系列(三)之修改

最新推荐文章于 2025-08-29 18:01:45 发布

原创最新推荐文章于 2025-08-29 18:01:45 发布 · 949 阅读

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#delay #function #email #date

今天参考了网上的一篇关于去抖动的程序，把昨天的改了一下，但并没有实现检测一个键同时按下两次或多次的情况。

/*
//$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$//
||       FileName: key.c                           ||
||       Function: 实现一个按键控制一个灯的亮灭    ||
||       Author : Softstone            ||
||       Date    : 2007/04/21                      ||
||   Email   : softstonechwch@126.com          ||
||$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$//
*/
#include <reg51.h>
#include <intrins.h>

#define uchar unsigned char
#define LED P0 //LED接在P0口上，使用低四位，P0^0——P0^3
#define KEY P2

sbit LedCs= P3^7;

//函数声明
void Delay(void);
void KeyScan(void);

void main()
{
KEY   = 0xff;
LED   = 0xff;
LedCs = 0;

while (1)
{
  KeyScan();
}
}

void KeyScan()
{
uchar temp;
while(1)
{
  if ( KEY!=0xff )
  {
   Delay();

   if ((KEY != 0xff) && (KEY != LED))
   {

    switch ( KEY )
    {
    case 0xfe: LED = 0xfe; break;
    case 0xfd: LED = 0xfd; break;
    case 0xfb: LED = 0xfb; break;
    case 0xf7: LED = 0xf7; break;
    default: break;
    }


   }


     while (KEY == 0xff); //等待按键放下

  }