timer.c

基于89S52的电子钟程序,使用查询模式

#include "reg51.h"

#define uint unsigned int
#define uchar unsigned char

sbit P0_0=P0^0;
sbit P0_1=P0^1;
sbit P0_2=P0^2;
sbit P0_3=P0^3;
sbit P0_4=P0^4;
sbit P0_5=P0^5;
sbit P0_6=P0^6;
sbit P0_7=P0^7;
//P2口
sbit P2_0=P2^0;
sbit P2_1=P2^1;
sbit P2_2=P2^2;
sbit P2_3=P2^3;
sbit P2_4=P2^4;
sbit P2_5=P2^5;
sbit P2_6=P2^6;
sbit P2_7=P2^7;

//定义全局变量、
uchar ucn=0;
uchar count_s=0;
uchar count_m=54;
uchar count_h=15;

//延时程序
void delay(uchar m)
{
	uint i,j;
	for(i=0;i<m;i++)
		for(j=0;j<100;j++);
}

//显示
void display(uchar n)
{
	if(n==0)
	{
		P2_0=0;
		P2_1=0;
		P2_2=0;
		P2_3=0;
		P2_4=0;
		P2_5=0;
		P2_6=1;
	//	P2_7=1;
	}
	if(n==1)
	{
		P2_0=1;
		P2_1=0;
		P2_2=0;
		P2_3=1;
		P2_4=1;
		P2_5=1;
		P2_6=1;
	//	P2_7=1;
	}
	if(n==2)
	{
		P2_0=0;
		P2_1=0;
		P2_2=1;
		P2_3=0;
		P2_4=0;
		P2_5=1;
		P2_6=0;
	//	P2_7=1;
	}
	if(n==3)
	{
		P2_0=0;
		P2_1=0;
		P2_2=0;
		P2_3=0;
		P2_4=1;
		P2_5=1;
		P2_6=0;
	//	P2_7=1;
	}
	if(n==4)
	{
		P2_0=1;
		P2_1=0;
		P2_2=0;
		P2_3=1;
		P2_4=1;
		P2_5=0;
		P2_6=0;
	//	P2_7=1;
	}
	if(n==5)
	{
		P2_0=0;
		P2_1=1;
		P2_2=0;
		P2_3=0;
		P2_4=1;
		P2_5=0;
		P2_6=0;
	//	P2_7=1;
	}
	if(n==6)
	{
		P2_0=0;
		P2_1=1;
		P2_2=0;
		P2_3=0;
		P2_4=0;
		P2_5=0;
		P2_6=0;
	//	P2_7=1;
	}
	if(n==7)
	{
		P2_0=0;
		P2_1=0;
		P2_2=0;
		P2_3=1;
		P2_4=1;
		P2_5=1;
		P2_6=1;
	//	P2_7=1;
	}
	if(n==8)
	{
		P2_0=0;
		P2_1=0;
		P2_2=0;
		P2_3=0;
		P2_4=0;
		P2_5=0;
		P2_6=0;
	//	P2_7=1;
	}
	if(n==9)
	{
		P2_0=0;
		P2_1=0;
		P2_2=0;
		P2_3=0;
		P2_4=1;
		P2_5=0;
		P2_6=0;
	//	P2_7=1;
	}
}
//显示横杠
void heng(void)
{
	P2_0=1;
	P2_1=1;
	P2_2=1;
	P2_3=1;
	P2_4=1;
	P2_5=1;
	P2_6=0;
}

//初始化
void Init(void)
{
	EA=1;							//CPU中断允许
	ET0=1;                          //允许T0溢出中断
	TMOD=0x01;                      //工作方式1，16位定时器
	TL0=0xaf;
	TH0=0x3c;
}

//中断程序
void timer0(void) interrupt 1 using 1
{
	TL0=0x77;
	TH0=0xec;
	
	if(ucn==200)
	{
		count_s++;
		if(count_s==60)
		{
			count_s=0;
			count_m++;
			if(count_m==60)
			{
				count_m=0;
				count_h++;
				if(count_h==24)
					count_h=0;
			}
		}
		ucn=0;    
	}
	ucn++;
}						 
void main(void)
{
	Init();
    
    TR0=1;							//允许计数

	while(1)
	{
		P0_0=0;
		display(count_s%10);
		delay(1);
		P0_0=1;

		P0_1=0;
		display(count_s/10);
		delay(1);
		P0_1=1;

		P0_2=0;
		display(count_m%10);
		delay(1);
		P0_2=1;

		P0_3=0;
		display(count_m/10);
		delay(1);
		P0_3=1;

		P0_4=0;
		display(count_h%10);
		delay(1);
		P0_4=1;

		P0_5=0;
		display(count_h/10);
		delay(1);
		P0_5=1;

		P0_6=0;
		heng();
		delay(1);
		P0_6=1;

		P0_7=0;
		heng();
		delay(1);
		P0_7=1;
	}	
}