前言

使用52单片机实现独立键盘控制数码管计数

代码

#include<reg52.h>
#define uchar unsigned char
#define uint unsigned intsbit key2 = P3^4;
sbit key3 = P3^5;
sbit key4 = P3^6;
sbit key5 = P3^7;char code smg[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
sbit wei = P2^7;
sbit duan = P2^6;void delayms(uint nms);
void display();
void keyCheck();uint num = 0;
void main()
{while(1){display();keyCheck();	}
}void delayms(uint nms)
{uint i,j;for(i=nms;i>0;i--)for(j=110;j>0;j--);
}void display()
{uint shi,ge;shi = num/10;ge = num%10;wei = 1;P0 = 0xFD;wei = 0;P0 = 0xFF;duan = 1;P0 = smg[ge];duan = 0;delayms(5);P0 = 0xFF;wei = 1;P0 = 0xFE;wei = 0;P0 = 0xFF;duan = 1;P0 = smg[shi];duan = 0;delayms(5);P0 = 0xFF;		
}void keyCheck()
{if(key2 == 0){delayms(10);if(key2 == 0){num++;if(num >= 60)num = 0;}while(!key2);}if(key3 == 0){delayms(10);if(key3 == 0){num--;if(num == 0)num = 60;}while(!key3);}if(key4 == 0){delayms(10);if(key4 == 0){num = 0;}while(!key4);}
}

结论

key2按下：数码管增加计数
key3按下：数码管减小计数
key4按下：数码管清零