STC89C52：4*4键盘C语言程序

/*MCU:STC89C52*/
/*Designed by: Y.Q.Bi*/

#include <reg52.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int

uchar code table[]={0xc0,0xf9,0xa4,0xb0,
0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E};//共阴数码管显示代码

void Key_scan(void);
void delay(uint d);

void main(void)           //主程序
{
 while(1)
  {
     Key_scan();
   P1=0xf7;
      delay(2000);
  }
}

void Key_scan(void)     //确定按键子程序
{
uchar key,readkey,x_temp,y_temp;  
P2=0x0f;
x_temp=P2&0x0f;              //确定哪一行按键按下
if(x_temp==0x0f) goto keyout;
P2=0xf0;
y_temp=P2&0xf0;             //确定哪一列按键按下
readkey=x_temp|y_temp;      //确定具体的按键按下

switch(readkey)
    {
case 0xee:key=0;P0=table[key]; break;
case 0xde:key=1;P0=table[key]; break;
case 0xbe:key=2;P0=table[key]; break;
case 0x7e:key=3;P0=table[key]; break;
case 0xed:key=4;P0=table[key]; break;
case 0xdd:key=5;P0=table[key]; break;
case 0xbd:key=6;P0=table[key]; break;
case 0x7d:key=7;P0=table[key]; break;
case 0xeb:key=8;P0=table[key]; break;
case 0xdb:key=9;P0=table[key]; break;
case 0xbb:key=10;P0=table[key];break;
case 0x7b:key=11;P0=table[key];break;
case 0xe7:key=12;P0=table[key];break;
case 0xd7:key=13;P0=table[key];break;
case 0xb7:key=14;P0=table[key];break;
case 0x77:key=15;P0=table[key];break;
default:break;
    }

keyout:_nop_();
}

void delay(uint d)    //延时子程序
{
while(--d);
}

你可以在画一下4*4键盘，并将程序代入，逐个试试，就可以搞定了！