digital_clock.c

基于C语言编程的keil单片机有关数学时钟的设计

#include <at89x51.h>
unsigned char code disp_code[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71}; 
unsigned char count=0,second=0,minute=0;hour=0;

void delay( unsigned char n)
{
	unsigned char i,j;
	for(j=0;j<n;j++)
	  for(i=0;i<125;i++);	
}

display()
{   unsigned char temp[2];
	

	temp[1]=minute/10;  //高位
	temp[0]=minute%10;  //低位
	P2_6=0;P0=~disp_code[temp[1]]; delay(2);P2_6=1;
	P2_7=0;P0=~disp_code[temp[0]]; delay(2);P2_7=1;

	temp[1]=hour/10;  //高位
	temp[0]=hour%10;  //低位
	P2_4=0;P0=~disp_code[temp[1]]; delay(2);P2_4=1;
	P2_5=0; P0=~disp_code[temp[0]];delay(2);P2_5=1;
}

key_board()
{
	if(P3_2==0)
	{
		display();//延时20ms
		while(!P3_2)display();//P1_0为低电平等待
		minute++;  //分钟加1
		if(minute==60) {minute=0;hour++;}
	}
	if(P3_3==0)
	{
		display();//延时20ms
		while(!P3_3)display();//P1_1为低电平等待
		if(minute==0) minute=59;
		else  minute--;  //分钟减1
	}
	if(P3_4==0)
	{
		display();//延时20ms
		while(!P3_4)display();//P1_1为低电平等待
		hour++;  //hour加1
	}
	if(P3_5==0)
	{
		display();//延时20ms
		while(!P3_5)display();//P1_1为低电平等待
		hour--;  //hour加1
	}
}

main()
{	
	
	SP=0x60;
	TMOD=0X10;//T1 定时, 模式1  
	TH1=0x3C;  //0x3c  12MHz   定时50ms 15536/256;
	TL1=0xB0;  //0XB0;     15536%256;
	TR1=1;  //启动定时器
	IE=0x88;//  T1中断源许可,INT0中断许可
    while(1)
	{
	display();
	key_board();
	
	}

}

void T1_int() interrupt 3 using 1//工作寄存器用第一组08h-0fh
{
	TL1=0xB0;//重新赋给初值
	TH1=0x3C;
	count++;
	if(count==10)//20*50ms=1000ms=1s 
	{	
		count=0;
		P1_7=~P1_7;
		second++;
		if(second==60)
		{
		
			second=0;minute++;
			if(minute==60)
			{
				minute=0;hour++;
				if(hour==24) 
					{hour=0;
					}
			}
		
		}
		
	}	
}