4×3矩阵键盘c编程.c

单片机矩阵键盘程序 同时进行显示 绝对可用 看过就懂的

#include<reg51.h>
#include<absacc.h>
#define uchar unsigned char
#define uint unsigned int

uchar code Tab[12]={ 
        0xF9,/*1*/
        0xA4,/*2*/
        0xB0,/*3*/
        0x99,/*4*/
        0x92,/*5*/
        0x82,/*6*/
        0xF8,/*7*/
        0x80,/*8*/
        0x90,/*9*/
        0x88,/*A*/
		0xC0,/*0*/
        0xC6,/*C*/};
uchar idata com1,com2;
uint idata key[12]={0};

void delay()
{
   uchar i,j;
   for(i=0;i<20;i++)
   for(j=0;j<255;j++);
}

uchar key_scan()
{
   uchar temp;
   uchar i;
   delay();
   P2=0xf0;
   if(P2!=0xf0)
	 {
        com1=P2;
        P2=0x0f;
        com2=P2;        
      }
	P2=0xf0;
    while(P2!=0xf0);	  
	temp=com1|com2;
	if(temp==0xee)i=0;
	if(temp==0xed)i=1;
	if(temp==0xeb)i=2;
	if(temp==0xde)i=3;
	if(temp==0xdd)i=4;
	if(temp==0xdb)i=5;
	if(temp==0xbe)i=6;
	if(temp==0xbd)i=7;
	if(temp==0xbb)i=8;
	if(temp==0x7e)i=9;
	if(temp==0x7d)i=10;
	if(temp==0x7b)i=11;
	return(i);
}



void main()
{
   uchar dat;
   P0=0x00;
   while(1)
   { 
      P2=0xf0;
      while(P2!=0xf0)
	  {
      dat=key_scan();
	  P1=dat;
      key[0]=dat;
	  P0=Tab[key[0]];
	  }
    }
}