单片机1分钟计时代码，可以按键控制数字暂停和复位

ID:207124 · 发表于 2018-11-28 09:27

#include"reg52.h"
#define uint unsigned int
#define uchar unsigned char
//sbit e=P2^4;
//sbit f=P2^5;
sbit duan=P2^6;
sbit wei=P2^7;
sbit LED1=P0^0;                                              //声明LED1为P1.0端口
sbit LEDctr=P1^4;
sbit Beep=P2^2;
sbit key1=P3^2;
sbit key2=P3^4;
sbit key3=P3^6;
sbit key4=P3^7;
uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

void delayms(uchar);

uchar numt0,num;

void display(uchar numdis)
      {
            uchar shi,ge;
            shi=numdis/10;
            ge=numdis%10;

            duan=1;
            P0=table[shi];
            duan=0;
            P0=0xff;
            wei=1;
            P0=0xfe;
            wei=0;
            delayms(100);

            duan=1;
            P0=table[ge];
            duan=0;
            P0=0xff;
            wei=1;
            P0=0xfd;
            wei=0;
            delayms(10);
            }

void delayms(uchar xms)
   {
               uint i,j;
               for(i=xms;i>0;i--)
            for(j=130;j>0;j--);
   }

void init()
{
            TMOD=0x01;       //定时器工作模式
            TH0=(65536-20000)/256; //装初始值，20ms一次中断
            TL0=(65536-20000)%256;
            EA=1;                                  //全局中断允许位开
            ET0=1;             //定时器0中断允许位开
      }

void keyscan()
{

      Beep=1;
      if(key1==0)
         {
               delayms(1);

         if(key1==0)
            {
                  num++;
                  if(num==60)
                  num=0;
                     Beep=0;
                  while(!key1);
                     Beep=1;
            }
            }


      if(key2==0)
         {
               delayms(5);
               if(key2==0)
               {
                  if(num==0)
                        num=60;
                              num--;
                              Beep=0;
                              while(!key2);
                              Beep=1;
                     }
               }


         if(key3==0)
            {
                  delayms(5);
                     if(key3==0)
                     {
                        num=0;
                        Beep=0;
                        while(!key3);
                        Beep=1;
                     }

               }


            if(key4==0)
               {
                  delayms(5);
                     if(key4==0)
                     {
                        Beep=0;
                        while(!key4);
                        Beep=1;
                        TR0=~TR0;
                     }

                     }

      }



void main()
{
      init();
      while(1)
      {

               keyscan();

               display(num);
         }
      }


void T0_time()interrupt 1
{
TH0=(65535-20000)/256;
TL0=(65535-20000)%256;
numt0++;
if(numt0==50)
                  {
                        numt0=0;
                        num++;
                        if(num==60)
                              num=0;
                        }
  }

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