标题: 基于AT89c52单片机的基础实验，按下按键KEY1,数码管正计时；按下KEY2，数码管倒计... [打印本页]

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作者: 皮皮12323    时间: 2018-4-19 15:14
标题: 基于AT89c52单片机的基础实验，按下按键KEY1,数码管正计时；按下KEY2，数码管倒计...

1.按下按键KEY1,数码管正计时；按下KEY2，数码管倒计时；按下按键KEY3清零。

#include<reg52.h>

sbit ADDR0=P2^2;

sbit ADDR1=P2^3;

sbit ADDR2=P2^4;

sbit KEY1=P3^0;

sbit KEY2=P3^1;

sbit KEY3=P3^2;

unsigned char code LedChar[] = {

0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};

unsigned char LedBuff[2]= {0xFF,0xFF};

unsignedintcnt = 0;

unsigned char i=0;

unsigned char j=0;

unsigned char flagls=0;

unsigned long sec=0;

void main()

{

bit keybuf1=1;

bit backup1=1;

bit keybuf2=1;

bit backup2=1;

bit keybuf3=1;

bit backup3=1;

ADDR2=0;

ADDR1=0;

ADDR0=0;

EA = 1;

TMOD=0x01;

TH0=0xFC;

TL0=0x67;

ET0=1;

TR0=1;

while(1)

{

if(KEY1!=backup1)

{        

keybuf1=KEY1;

if(keybuf1==KEY1)

{

if(backup1==0)

{

sec=99;

j=2;

}

backup1=keybuf1;

}

}

if(KEY2!=backup2)

{        

keybuf2=KEY2;

if(keybuf2==KEY2)

{

if(backup2==0)

{

sec=0;

j=1;

}

backup2=keybuf2;

}

}

if(KEY3!=backup3)

{        

keybuf3=KEY3;

if(keybuf3==KEY3)

{

if(backup3==0)

{

sec=0;

j=3;

}

backup3=keybuf3;

}

}

if(flagls==1)

{

flagls = 0;     

if(j==1){

sec++;

         LedBuff[0]= LedChar[sec%10];

                   LedBuff[1]= LedChar[sec/10%10];

        }

                   if(j==2){

sec--;

         LedBuff[0]= LedChar[sec%10];

                   LedBuff[1]= LedChar[sec/10%10];

        }

                   if(j==3){

sec=0;

         LedBuff[0]= LedChar[sec%10];

                   LedBuff[1]= LedChar[sec/10%10];

        }

}

  }

}

void InterruptTimer0() interrupt 1

          {

           TH0=0xFC;

           TL0=0x67;

cnt++;

if(cnt>=1000)

     {

cnt=0;

flagls=1;

      }

         

          P0=0xFF;

         switch(i)

          {

         case0:ADDR2=0;ADDR1=0;ADDR0=0;i++;P0=~LedBuff[0];break;

         case1:ADDR2=0;ADDR1=0;ADDR0=1;i=0;P0=~LedBuff[1];break;

         default:break;

          }  }

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