51单片机DIY_秒表计时器

计时表量程：00：00：00–59:59:99（min：s：10ms）

可存储和回查5组数据。

代码：

#include<reg52.h>
#include<string.h>
/***********************定义管脚**********************/
#define seg P0
#define bitt P2

typedef unsigned char u8;
typedef unsigned int u16;

sbit start = P3^1;
sbit store = P3^0;
sbit playback = P3^2;
sbit reset = P3^3;
sbit beep = P1^5;

/***********************定义变量**********************/
u8 code display_bit[]={0x00,0x04,0x08,0x0c,0x10,0x14,0x18,0x1c};
u8 code display_seg[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d, 0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00,0x40};
u8 time_store[5][3] = {0};
u8 i,j,k,flag;													   //*******全局变量*********//
u8 n_10ms;													   
u8 n_s;
u8 n_min;

/***********************延时函数**********************/
void delay(u8 ms)												   
{
	u16 x,y;
	for(x=ms;x>0;x--)
		for(y=110;y>0;y--);
}

/**********************嗡鸣器函数*********************/
void beep_vibrate()
{
	beep = ~beep;
	delay(1);	
	beep = ~beep;
	delay(1);
}

/*********************数码管显示**********************/
void led_display(u8 num_seg,u8 num_bit)							   
{	
	bitt = display_bit[num_bit];
	seg = display_seg[num_seg];
}

/****************选择时间显示位置*********************/
void time_display(u8 time_bit, u8 time_num)						   
{
	u8 x,y,s;
	s = 1;
	x = time_num/10;                                //分离十位
	y = time_num%10;                                //分离个位
	if(time_bit == 1)
	{
		led_display(y,0);
		delay(s);
		led_display(x,1);
		delay(s);		
	}
	else if(time_bit == 2)
	{
		led_display(y,3);
		delay(s);	  
		led_display(x,4);
		delay(s);	
	}
	else if(time_bit == 3)
	{
		led_display(y,6);
		delay(s);
		led_display(x,7);
		delay(s);
	}
	else
	{
		led_display(17,2);
		delay(s);
		led_display(17,5);
		delay(s);
	}	 
}

/********************不断刷新三组数字****************/
void reflash()													   
{
	time_display(1,n_10ms);
	time_display(2,n_s);
	time_display(3,n_min);
	time_display(4,0);	
}

/**********************定时器T0预设******************/
void  Init_timer0()												   
{
	IE = 0X82;										//中断允许
	TMOD = 0x01;
    TH0 = 0x0D8;
    TL0 = 0x0F0;
}

/************************开始函数*********************/														
void start_k1()
{
	if(start == 0)
	{
		delay(5);
		if(start == 0)
		{
			flag = ~flag;
		}
		while(!start);
	}
}

/************************存储函数*********************/
void store_k2()
{
	if(store == 0)
	{
		delay(5);
		if(store == 0)
		{
			if(i < 5)
			{
				time_store[i][0] = n_10ms;
				time_store[i][1] = n_s;
				time_store[i][2] = n_min;
				i++;
			}
			while(!store);
		}
	}	
}

/************************回显函数*********************/
void playback_k3()
{
	if(playback == 0)
	{
		delay(5);
		if(playback == 0)
		{
			if(i >= 0)
			{
				i = i>4?4:i;
				n_10ms = time_store[i][0];
				n_s = time_store[i][1];
				n_min = time_store[i][2];
				i--;
			}
		    while(!playback);
		}
	}	
}

/************************清0函数*********************/
void reset_k4()
{
	if(reset == 0)
	{
		delay(5);
		if(reset == 0)
		{
			TR0 = 0;
			Init_timer0();
			flag = 0;
			i = 0;
		    memset(time_store,0,sizeof(time_store));//将time_store[][]二维数组的元素全部设为0
			n_10ms = 0;
			n_s = 0;
			n_min = 0;
			while(!reset);
		}
	}	
}

/************************主函数**********************/
void main()														   
{
	seg = 0x00;
  	Init_timer0();
	n_10ms = 0;										//10毫秒
	n_s = 0;										//秒
	n_min = 0;										//分钟
	beep = 1;										//嗡鸣器初始化
	flag = 0;										//flag=1时，定时器打开
	i = 0;										
	while(1)										//大循环
	{
		start_k1();						            //开始
		if(flag)
		{
			TR0 = 1;								//打开定时器
			store_k2();						        //存储	
		}
		else
		{
			TR0 = 0;								//关闭定时器
			playback_k3();							//回显
		}											
		reset_k4();						     		//清0
		reflash();									//刷新一次
	}
}

/*******************定时器服务函数*******************/
void timer0_service() interrupt 1								   
{
	TH0 = 0x0D8;
    TL0 = 0x0F0;
	if(n_10ms < 99)
	{
		n_10ms++;
	}
	else
	{
		n_10ms = 0;
		if(n_s < 59)
		{
			n_s++;	
		}
		else
		{
			n_s = 0;
			if(n_min < 59)
			{
				n_min++;
			}
			else
			{
				reset_k4();	
			}	
		}
	}
}

仿真图