martix_keyboard_samea.c

51单片机矩阵键盘的设计与调试

#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
#define ulong unsigned long
sbit choose_du=P2^6;
sbit choose_we=P2^7;
/*uchar code table[]={			//0-9的共阴极代码 	
		0x3f,0x06,0x5b,0x4f,
		0x66,0x6d,0x7d,0x07,
		0x7f,0x6f,0x77,0x7c,
		0x39,0x5e,0x79,0x71	
			};*/
uchar code table[]={			//0-9的共阴极代码 	
		0xc0,0xf9,0xa4,0xb0,
		0x99,0x92,0x82,0xf8,
		0x80,0x90,0x88,0x83,
		0xc6,0xa1,0x86,0x8e	
			};
uchar temp,num;
void delay(uchar);
void display(uchar);
void main()
{
	while(1)
	{
		P3=0xfe;
		temp=P3;
		temp=temp&0xf0;
		if(temp!=0xf0)
		{
			delay(22);
			if(temp!=0xf0)
			{
				switch(temp)
				{
					case 0xe0:num=0;
					break;
					case 0xd0:num=1;
					break;
					case 0xb0:num=2;
					break;
					case 0x70:num=3;
					break;
				}
			}
			while(temp!=0xf0)//键盘松开去抖动 
			{
				temp=P3;
				temp=temp&0xf0;
			}	
		}
		P3=0xfd;
		temp=P3;
		temp=temp&0xf0;
		if(temp!=0xf0)
		{
			delay(22);
			if(temp!=0xf0)
			{
				switch(temp)
				{
					case 0xe0:num=4;
					break;
					case 0xd0:num=5;
					break;
					case 0xb0:num=6;
					break;
					case 0x70:num=7;
					break;
				}
			}
			while(temp!=0xf0)//键盘松开去抖动 
			{
				temp=P3;
				temp=temp&0xf0;
			}		
		}
		P3=0xfb;
		temp=P3;
		temp=temp&0xf0;
		if(temp!=0xf0)
		{
			delay(22);
			if(temp!=0xf0)
			{
				switch(temp)
				{
					case 0xe0:num=8;
					break;
					case 0xd0:num=9;
					break;
					case 0xb0:num=10;
					break;
					case 0x70:num=11;
					break;
				}
			}
			while(temp!=0xf0)//键盘松开去抖动 
			{
				temp=P3;
				temp=temp&0xf0;
			}		
		}
		P3=0xf7;
		temp=P3;
		temp=temp&0xf0;
		if(temp!=0xf0)
		{
			delay(22);
			if(temp!=0xf0)
			{
				switch(temp)
				{
					case 0xe0:num=12;
					break;
					case 0xd0:num=13;
					break;
					case 0xb0:num=14;
					break;
					case 0x70:num=15;
					break;
				}
			}
			while(temp!=0xf0)//键盘松开去抖动 
			{
				temp=P3;
				temp=temp&0xf0;
			}		
		}
		display(num);
	}
}
void delay(uchar x)
{	
	uchar i,j;
	for(i=x;i>0;i--)
		for(j=205;j>0;j--);
}
void display(uchar y)
{
	P0=0xff;
	choose_we=1;
	choose_we=0;
	P0=table[y];
	choose_du=1;
	choose_du=0;
	P0=0xc0;
	choose_we=1;
	choose_we=0;	
}