52单片机独立键盘控制数码管计数

前言

使用52单片机实现独立键盘控制数码管计数

代码

#include
#define uchar unsigned char
#define uint unsigned int

sbit key2 = P3^4;
sbit key3 = P3^5;
sbit key4 = P3^6;
sbit key5 = P3^7;

char code smg[] = {0x3f,0x06,0x5b,0x4f,
				  0x66,0x6d,0x7d,0x07,
				  0x7f,0x6f,0x77,0x7c,
				  0x39,0x5e,0x79,0x71};
sbit wei = P2^7;
sbit duan = P2^6;

void delayms(uint nms);
void display();
void keyCheck();

uint num = 0;
void main()
{
	while(1)
	{
		display();
		keyCheck();	
	}
}

void delayms(uint nms)
{
	uint i,j;
	for(i=nms;i>0;i--)
		for(j=110;j>0;j--);
}

void display()
{
	uint shi,ge;
	shi = num/10;
	ge = num%10;
	
	wei = 1;
	P0 = 0xFD;
	wei = 0;
	P0 = 0xFF;
	duan = 1;
	P0 = smg[ge];
	duan = 0;
	delayms(5);
	P0 = 0xFF;

	wei = 1;
	P0 = 0xFE;
	wei = 0;
	P0 = 0xFF;
	duan = 1;
	P0 = smg[shi];
	duan = 0;
	delayms(5);
	P0 = 0xFF;		
}

void keyCheck()
{
	if(key2 == 0)
	{
		delayms(10);
		if(key2 == 0)
		{
			num++;
			if(num >= 60)
				num = 0;
		}
		while(!key2);
	}
	
	if(key3 == 0)
	{
		delayms(10);
		if(key3 == 0)
		{
			num--;
			if(num == 0)
				num = 60;
		}
		while(!key3);
	}
	if(key4 == 0)
	{
		delayms(10);
		if(key4 == 0)
		{
			num = 0;
		}
		while(!key4);
	}
}

结论

key2按下：数码管增加计数
key3按下：数码管减小计数
key4按下：数码管清零