使用单片机定时器实现时钟显示

ID:884109 · 发表于 2021-5-30 17:44

方法一：利用定时器溢出查询实现
#include <reg51.h>
#include <intrins.h>

#define uint unsigned int
#define uchar unsigned char

//共阴数码管段选表0-9
uchar  code tabel[]= {0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F,0x40};

uchar hour,minute,second;
void delay();
void display();
void timerInit();

void main(void)
{
      uchar i;

      timerInit();
      i = 0;
      hour = 12;
      minute = 34;
      second = 56;

      while(1){
            if( 1 == TF0 ){
                     TF0 = 0;
                     TH0 = 0x4B;
                     TL0 = 0xFC;
                     i++;
                     if( 20 == i ){
                              second++;
                              i = 0;
                     }
                     if( 60 == second ){
                              second = 0;
                              minute++;
                     }
                     if( 60 == minute ){
                              minute = 0;
                              hour++;
                     }
                     if( 24 == hour ){
                              hour = 0;
                     }
            }
            display();
      }
}

void timerInit()
{
      TMOD = 0x01;
      TH0 = 0x4B;
      TL0 = 0xFC;
      TR0 = 1;
}

void delay()
{
      uchar i;
      for( i = 0; i < 111; i++ ) ;
}

void display()
{
      P0 = tabel[ hour / 10 ];
      P1 = 0x80;
      delay();
      P0 = tabel[ hour % 10 ];
      P1 = 0x40;
      delay();

      P0 = tabel[ 10 ];
      P1 = 0x20;
      delay();

      P0 = tabel[ minute / 10 ];
      P1 = 0x10;
      delay();
      P0 = tabel[ minute % 10 ];
      P1 = 0x08;
      delay();

      P0 = tabel[ 10 ];
      P1 = 0x04;
      delay();

      P0 = tabel[ second / 10 ];
      P1 = 0x02;
      delay();
      P0 = tabel[ second % 10 ];
      P1 = 0x01;
      delay();
}

方法二：利用定时器中断实现
#include <reg51.h>
#include <intrins.h>

#define uint unsigned int
#define uchar unsigned char

//共阴数码管段选表0~9和-
uchar  code tabel[]= {0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F,0x40};
uchar  code wei[]= {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80};

uchar hour,minute,second,i;

void delay();
void display();
void timerInit();

void main(void)
{
      timerInit();
      hour = 12;
      minute = 34;
      second = 56;

      while(1){

            display();
      }
}

void timerInit()
{
      TMOD = 0x01;
      TH0 = 0x4B;
      TL0 = 0xFC;
      TR0 = 1;

      EA = 1;
      ET0 = 1;
}

void delay()
{
      uchar i;
      for( i = 0; i < 111; i++ ) ;
}

void display()
{
      P0 = tabel[ hour / 10 ];
      P1 = wei[ 7 ];
      delay();
      P0 = tabel[ hour % 10 ];
      P1 = wei[ 6 ];
      delay();

      P0 = tabel[ 10 ];
      P1 = wei[ 5 ];
      delay();

      P0 = tabel[ minute / 10 ];
      P1 = wei[ 4 ];
      delay();
      P0 = tabel[ minute % 10 ];
      P1 = wei[ 3 ];
      delay();

      P0 = tabel[ 10 ];
      P1 = wei[ 2 ];
      delay();

      P0 = tabel[ second / 10 ];
      P1 = wei[ 1 ];
      delay();
      P0 = tabel[ second % 10 ];
      P1 = wei[ 0 ];
      delay();
}

void timer0Int() interrupt 1
{
      i++;
      if( 20 == i ){
            second++;
            i = 0;
      }
      if( 60 == second ){
            second = 0;
            minute++;
      }
      if( 60 == minute ){
            minute = 0;
            hour++;
      }
      if( 24 == hour ){
            hour = 0;
      }
      TH0 = 0x4B;
      TL0 = 0xFC;
}

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使用单片机定时器实现时钟显示

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