51单片机---矩阵键盘检测和数码管联动

RamBo张

于 2024-11-28 14:50:46 发布

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分类专栏： 51单片机文章标签： 51单片机矩阵计算机外设

本文链接：https://blog.youkuaiyun.com/baimeiyunrui/article/details/144109122

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#include <reg52.h>

sbit dula=P2^6;
sbit wela=P2^7;
unsigned char num,temp;
//定义数码管显示的数字变量
unsigned char num;
//定义数码管显示的数组
unsigned char code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71,0};
//显示函数声明
void display(unsigned char aa);
//按键检测函数
unsigned char keyscan();
//延时函数
void delay(unsigned int z)
{
	unsigned int x,y;
	for(x=z;x>0;x--)
	   for(y=110;y>0;y--);
}

void main()
{
	num=17;
	dula=1;
	P0=0;
	dula=0;
	wela = 1;
        P0 = 0xc0;
	wela = 0;
	while(1)
	{
		display(keyscan());
	}
	
}

void display(unsigned char aa)
{
	dula=1;
	P0=table[aa-1];
	dula=0;	
}

unsigned char keyscan()
{
	P3=0xfe;
	temp=P3;
	temp=temp&0xf0;
	while(temp!=0xf0)
	{
		delay(5);
		temp=P3;
	        temp=temp&0xf0;
		while(temp!=0xf0)
		{
			temp=P3;
			switch(temp)
			{
				case 0xee:num=1;
					break;
				case 0xde:num=2;
					break;
				case 0xbe:num=3;
					break;
				case 0x7e:num=4;
					break;

			}
			while(temp!=0xf0)
			{
				temp=P3;
				temp=temp&0xf0;
			}

		}
	}

	P3=0xfd;
	temp=P3;
	temp=temp&0xf0;
	while(temp!=0xf0)
		{
			delay(5);
			temp=P3;
			temp=temp&0xf0;
			while(temp!=0xf0)
			{
				temp=P3;
			switch(temp)
				{
					case 0xed:num=5;
						break;
					case 0xdd:num=6;
						break;
					case 0xbd:num=7;
						break;
					case 0x7d:num=8;
						break;
				}
			while(temp!=0xf0)
				{
					temp=P3;
					temp=temp&0xf0;
				}
			}
		}


	P3=0xfb;
	temp=P3;
	temp=temp&0xf0;
	while(temp!=0xf0)
		{
			delay(5);
			temp=P3;
			temp=temp&0xf0;
			while(temp!=0xf0)
			{
				temp=P3;
			switch(temp)
				{
					case 0xeb:num=9;
						break;
					case 0xdb:num=10;
						break;
					case 0xbb:num=11;
						break;
					case 0x7b:num=12;
						break;
				}
			while(temp!=0xf0)
				{
					temp=P3;
					temp=temp&0xf0;
				}
			}
		}


	P3=0xf7;
	temp=P3;
	temp=temp&0xf0;
	while(temp!=0xf0)
		{
			delay(5);
			temp=P3;
			temp=temp&0xf0;
			while(temp!=0xf0)
			{
				temp=P3;
			switch(temp)
				{
					case 0xe7:num=13;
						break;
					case 0xd7:num=14;
						break;
					case 0xb7:num=15;
						break;
					case 0x77:num=16;
						break;
				}
			while(temp!=0xf0)
				{
					temp=P3;
					temp=temp&0xf0;
				}
			}
		}
return num;


}

矩阵键盘