缘由怎么实现两位秒表自动加减_嵌入式-CSDN问答

#include "REG52.h"
sbit K1 = P1^5;
sbit K2 = P1^6;
sbit K3 = P1^7;
sbit K4 = P1^4;
//sbit LED1=P1^0;
//sbit LED2=P1^1;
//sbit LED3=P1^2;
//sbit LED4=P1^3;
bit k=0;
unsigned char code SmZiFu[]={63,6,91,79,102,109,125,7,127,111,128};//0-9.
unsigned char Js=0,miao=0,fen=0;//中断计时
void smxs(unsigned char mz,unsigned char w,unsigned char d)
{
	unsigned char Xd=0;
	P0=255;
	P0=255-(d==1?SmZiFu[mz]:(SmZiFu[mz]|0x80));//小数点闪烁
	P2=w;
//	if(w==1){LED1=1;LED2=0;}else {LED1=0;LED2=1;}
	while(++Xd);
}
void JiShi(/*时间计算*/)
{
	if(Js>=4)
{
Js=0;
	miao+=(k?-1:1);
	if(miao==99||miao==0)k=~k;
}
}
void ZhongDuanSheZhi()
{
	TH0+=0X4c;/*定时器赋初值，定时50ms触发中断，自动补偿方式*/
	TL0+=0X00; 
	TMOD=0X01;
	TR0=1; 
	ET0=1; //开启定时器
	EA=1; //全局中断开关
}
void main()
{
	unsigned char Xd=200,ss=0;
	unsigned int wei=0;
	ZhongDuanSheZhi();//LED3=LED4=0;
	while(1)
	{
		if(K1==0&&++Xd==0){++miao;while(K1==0);Xd=200;}
		if(K2==0&&++Xd==0){--miao;while(K2==0);Xd=200;}
		if(K3==0&&++Xd==0){TR0=~TR0;while(K3==0);Xd=200;}
		if(K4==0&&++Xd==0){TR0=0;miao=0;while(K4==0);Xd=200;}
		smxs(miao/10%10,4,k?0:1);
		smxs(miao%10,8,k?1:0);
		P3=(k?15:240);
		JiShi();//一定要放在最后
	}
}
void ZhongDuan() interrupt 1
{
	++Js;
	TH0+=0X4c;
	TL0+=0X00;        
}