[嵌入式]单片机 多功能秒表的实现

#include <REGX51.H>
#define uchar unsigned char
#define uint unsigned int

#define PIN0 P0  
#define PIN1 P1 
#define PIN3 P3	

sbit start=P2^7; 
sbit reset=P2^6;
sbit add=P2^5;
sbit reduse=P2^4;

uint second=0;   
uint num=0;     
uint num1=0;		

uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07, 0x7f,0x6f};
uchar code table1[]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,0x87,0xff,0xef};
uchar code table2[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};

void Delayms(uint x){
	uint i,j;
	for(i=0;i<x;i++)
		for(j=0;j<123;j++);
}
void Display(uint w,uint a,uint b,uint c,uint d){
	PIN3=table2[w];	
	Delayms(1);
	
	PIN0=table[a]; 
	PIN1=0x7f;
	Delayms(1);			
	
	PIN0=table[b];  
	PIN1=0xbf;
	Delayms(1);
	
	PIN0=table1[c];  
	PIN1=0xdf;			 
	Delayms(1);
		
	PIN0=table[d];
	PIN1=0xef;		
	Delayms(1);		
		
}

void InitTimer0(){ 
		TMOD=0x01;
	TH0=(65536-50000)/256;
	TL0=(65536-50000)%256;
	EA=1;		
	ET0=1;	
	TR0=0;	
}
void main()
{
	uint ms100=0;
	uint s,s1,min,min1,minute=0; 

	InitTimer0();	
	while(1)		
{
	if(add==0){
		Delayms(20); 
		if(add==0){
			minute++;
			while(!add);
		}
	}
	
	if(reduse==0){
		Delayms(20); 
		if(reduse==0){
			minute--;
			while(!reduse);
		}
	}
	
	if(start==0){  
			Delayms(20); 
	{
		if(start==0){  	
			TR0=!TR0;	
			while(!start);
		}
	}
}
if(reset==0){ 
	Delayms(20);
	if(reset==0)  
	{
		num=0;		
		num1=0;	
		ms100=0;	
		second=0;		
		minute=0;	
		while(!reset);		
	}
}
	if(num1>=2)		
	{
		num1=0;  		
		ms100++;	
		if(ms100>=10) 
		{
			ms100=0; 
			num1=0;
		}
	}
	
	if(num>=20)
	{
		num=0;    
		second++;		
		if(second>=60) 
	{
		second=0;	
		minute++;		
		if(minute>=60) 

		{
			TR0=!TR0;			
			num1=0;
			num=0;
			ms100=0;
			second=0;		
			minute=0;
			
		}
	}
	}	
	s=second%10;  	
	s1=second/10; 	
	min=minute%10;	
	min1=minute/10;	
	Display(ms100,s,s1,min,min1);  
}	
}

void TIMER0()  interrupt 1  
{
	TH0=(65536-50000)/256;  
	TL0=(65536-50000)%256;
	num++;		
	num1++;	
}