单片机实验代码——可调时间的时钟程序

今天单片机课上写的一个时钟程序，代码如下：

#include <reg51.h>#define uint unsigned int#define uchar unsigned charsbit S1 = P1^3;sbit S2 = P1^1;sbit S3 = P1^2;sbit S4 = P1^0;sbit beep = P2^7;sbit a = P0^0;sbit b = P0^1;sbit c = P0^2;sbit d = P0^3;sbit e = P0^4;sbit f = P0^5;sbit g = P0^6;sbit p = P0^7;sbit key1 = P1^4;sbit key2 = P1^5;sbit key3 = P3^6;sbit key4 = P3^7;uchar num, hour, min, sec, snum;uchar qian, bai, shi, ge, counter;uchar code N[10] = {0xc0, 0xf9 ,0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x90}; //0, 1, 2, 3, ...8, 9uchar code Z[10] = {0x40, 0x79 ,0x24, 0x30, 0x19, 0x12, 0x02, 0x78, 0x00, 0x10}; //0., 1., 2., ... 8., 9.void delayms(uint xms){uint i,j;for(i = xms; i > 0; i--)for(j = 110; j > 0; j--);}void init(){TMOD = 0x01;TH0 = 0x3c;TL0 = 0xb0;S1 = S2 = S3 = S4 = 0;P0 = N[0];delayms(5);EA = 1;TR0 = 0;ET0 = 1;hour = min = sec = 0;}void display(){if(min >= 0){shi = min/10;ge = min%10;S4 = 0;S1 = S2 = S3 = 1;P0 = N[ge];delayms(5);S3 = 0;S1 = S2 = S4 = 1;P0 = N[shi];}delayms(5);if(hour >= 0){qian = hour/10;bai = hour%10;S2 = 0;S1 = S3 = S4 = 1;P0 = Z[bai];delayms(5);S1 = 0;S2 = S3 = S4 = 1;P0 = N[qian];}delayms(5);}void keyscan(){if(key1 == 0){delayms(10);if(key1 == 0){while(!key1);TR0 = ~TR0;}}if(key2 == 0){delayms(10);if(key2 == 0){hour = min = sec = num = 0;while(!key1);}}if(key3 == 0)//功能键，位选       {           delayms(10);           if(key3 == 0)           {               snum++; while(!key3); //等待按键释放              switch(snum){case 1:TR0 = 0;//display();S4 = 0;S1 = S2 = S3 = 1;P0 = N[ge];delayms(50);S3 = 0;S1 = S2 = S4 = 1;P0 = N[shi];delayms(50);break;case 2:S2 = 0;S1 = S3 = S4 = 1;P0 = Z[bai];delayms(50);S1 = 0;S2 = S3 = S4 = 1;P0 = N[qian];delayms(50);break;case 3:snum = 0;TR0 = 1;break;}        }       }if(key4 == 0)    {           delayms(10);           if(key4 == 0)           {               while(!key4); //等待按键释放              switch(snum){case 1:min++;if(min >= 60)min = min - 60;shi = min/10;ge = min%10;S4 = 0;S1 = S2 = S3 = 1;P0 = N[ge];delayms(5);S3 = 0;S1 = S2 = S4 = 1;P0 = N[shi];delayms(5);break;case 2:hour++;if(hour >= 24)hour = hour - 24;qian = hour/10;bai = hour%10;S2 = 0;S1 = S3 = S4 = 1;P0 = Z[bai];delayms(5);S1 = 0;S2 = S3 = S4 = 1;P0 = N[qian];delayms(5);break;case 3:snum = 0;TR0 = 1;break;}              }      }}main(){init();while(1){keyscan();display();}}void T0_time() interrupt 1{TH0 = 0x3c;TL0 = 0xb0;num++;if(num == 20){num = 0;sec = sec + 60;//这里是为了加快时钟速度if(sec >= 60){sec = sec - 60;min = min + 1;if(min >= 60){min = min - 60;hour = hour + 1;if(hour >= 24){hour = 0;}}}}} 

PS：准备再加点功能【1.闹钟功能(可以结合蜂鸣器)；2.模式选择功能(然后把秒表模式加上)】

参考文档：郭天祥新概念51单片机源程序

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