《单片机实践项目》之《电子DIY》之基于51单片机的60秒倒计时设计

程序

							
#include "reg51.h"
//视频讲解：B站搜索：“逗比小憨憨”
#define LED_PORT P0

#define uchar unsigned char
#define uint  unsigned int

sbit dula=P2^0;
sbit wela=P2^1;
sbit LED1=P1^0;
sbit LED2=P1^1;
sbit START=P3^2;
sbit STOP=P3^3;


uchar  counter=0;
uchar  display_value=0;
uchar  START_STOP_Flag=0;

uchar code dis[16]={
    
    0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

void delay_ms(uint a);
void display(uchar i,uchar j);


void delay_ms(uint a)
{
    
    
	uint i=0,j=0;
	for(i=0;i<a;i++)
		for(j=0;j<118;j++);// 1ms
}

void display(uchar i,uchar j)
{
    
    
   dula=wela=0;
   LED_PORT=0X00;
   dula=1;
   LED_PORT=dis[i];
   dula=0;
   LED_PORT=0XFF;
   wela=1;
   LED_PORT=0xfe;
   wela=0;
   delay_ms(5);
   LED_PORT=0X00;
   dula=1;
   LED_PORT=dis[j];
   dula=0;
   LED_PORT=0Xff;
   wela=1;
   LED_PORT=0xfd;
   wela=0;
   delay_ms(5);
}

void Init(void)
{
    
    
	LED1=0;
	LED2=1;
	TMOD=0x01;		 			
	TH0=(65536-50000)/256;
	TL0=(65536-50000)%256;
	ET0=1;
	IT0=1;
	IT1=1;
	EX0=1;
	EX1=1;
	PX0=1;
	PX1=1;			 
	EA=1;
}
int main(void)
{
    
    
	uchar cnt=60;
	 
	Init();	
	while(1)
	{
    
    
		if(START_STOP_Flag==1)
		{
    
    
			if(counter==20)//50*20=1S
			{
    
    	
				counter=0;
				LED1=!LED1;
				LED2=!LED2;
				display_value++;//1
				cnt=60-display_value;  //59
				if(display_value==60)
				{
    
    
					display_value=0;	   //若到了60s，则归零
				}
			}
			display(cnt/10,cnt%10);	   //显示
		}
		else
		{
    
    
			display(6,6);	   //显示	
		}
	}
	return 0;
}

void Timer0(void) interrupt 1 using 0
{
    
    
	TH0=(65536-50000)/256;
	TL0=(65536-50000)%256;
	counter++;
}

void Int0(void)interrupt 0 using 0
{
    
    
	START_STOP_Flag=1;
	TR0=1;	
}

void Int1(void)interrupt 2 using 1
{
    
    
	START_STOP_Flag=0;	
	TR0=0;
	TH0=(65536-50000)/256;
	TL0=(65536-50000)%256;
	counter=0;
}