51单片机DIY

熟悉了51单片机的内部资源，来DIY一个码表熟练一下：
首先，码表的功能设计：

状态切换设计：

下面是程序设计步骤：

然后，显示屏的显示规则（确定数码管计时、计分、计秒的位置）

按键的设计：
 

下面展示一下程序：

#include<reg52.h>
typedef unsigned char u8;
typedef unsigned int  u16;

/********端口定义*********/
#define DATA P0
sbit seg_sel = P1^4;
sbit bit_sel = P1^5;
sbit start = P3^2;
sbit store = P3^3;
sbit diskey = P3^4;
sbit reset = P3^5;
sbit led = P1^0;

/********变量定义*********/
u16 tem_ms;
u8	n_ten_ms,n_sec,n_min;
u8	run_flag;            //当run_flag为1，代表开始计数
u8  temp_buf[5][3];
u8  arr_pt;
u8 code seg_tab[]={
			  0xc0,0xf9,0xa4,0xb0,
			  0x99,0x92,0x82,0xf8,
			  0x80,0x90,0x88,0x83,
			  0xc6,0xa1,0x86,0x8e
			 };
u8 code bit_tab[]={
			  0x10,0x20,0x40,0x80,
			  0x01,0x02,0x04,0x08
			 };

void delay(unsigned int y)
{
	unsigned int x,z;
	for(x=y; x>0; x--)
		for(z=110; z>0; z--);
}

void display_led(u8 which_bit, u8 which_number)
{
	bit_sel = 1;        //Q[7..0]=D[7..0]
	DATA = bit_tab[which_bit];
	bit_sel = 0;        //BIT[7..0]=0x80
	seg_sel = 1;        //Q[7..0]=D[7..0]
	DATA = seg_tab[which_number];
	seg_sel = 0;
}

void display(u8 which_bit, u8 which_number)
{
	u8 x,y;
	x = which_number/10;        //分离十位
	y = which_number%10;        //分离个位
	if (which_bit == 1)
	{
		display_led(1, x);
		delay(2);
		display_led(0, y);	
		delay(2);
	}
	if (which_bit == 2)
	{
		display_led(4, x);
		delay(2);
		display_led(3, y);	
		delay(2);
	}
	if (which_bit == 3)
	{
		display_led(7, x);
		delay(2);
		display_led(6, y);	
		delay(2);
	}
}

void reflash (void)
{
	display(1, n_ten_ms);	
	display(2, n_sec);	
	display(3, n_min);	
}

void main (void)
{
	TMOD = 0x01;//设置定时/计数器T0
	TH0 = (65535-10000) / 256;
	TL0 = (65535-10000) % 256;
	EA = 1;//开放总中断
	ET0 = 1;//开放定时器0的溢出中断
	//TR0 = 1;
	while (1)
	{
		if (start == 0)
		{
			delay(5);
			if (start == 0)
			{
				run_flag = ~run_flag;
			} while(!start);
		}

		if (run_flag)
		{
			TR0 = 1; //开始计数
		}	
		else if (!run_flag)
		{
			TR0 = 0;
			if (diskey == 0)
			{
				delay (5);
				if (diskey == 0)
				{
					arr_pt --;
					n_ten_ms = temp_buf[arr_pt][0];
					n_sec = temp_buf[arr_pt][1];
					n_min = temp_buf[arr_pt][2];					
				} while (!diskey);
			}
		}

		if (reset == 0)
		{
			delay(5);
			if (reset == 0)
			{
				n_ten_ms = 0;
				n_sec = 0;
				n_min = 0;	
			} while(!reset);
		}
		if (store == 0)
		{
			delay(5);
			if (store == 0)
			{
				if ((arr_pt >=0) && (arr_pt< 5))
				{
					temp_buf[arr_pt][0] = n_ten_ms;
					temp_buf[arr_pt][1] = n_sec;
					temp_buf[arr_pt][2] = n_min;
					arr_pt++;
				}
			} while(!store);
		}
		reflash();
	}
}

void t0_server(void) interrupt 1
{
	TH0 = (65535-10000) / 256;
	TL0 = (65535-10000) % 256;
	n_ten_ms++;
	if (n_ten_ms >= 100)
	{
		n_ten_ms = 0;
		n_sec++;
		if (n_sec >= 60)
		{
			n_sec = 0;
			n_min++;
			if (n_min >= 60)
				n_min = 0;
		}
	}
}

 

代码源自51自学网网站。