今儿整理了一个他人的C语言4*4键盘程序,用着还不错.

#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
#define duank P1               //键盘到单片机的端口
//DB 50H,1CH,39H,16H,38H,78H,70H,0FEH,0EFH,0FFH;A  B, C,    D,  E, ,F   ,P, -,  ,.  ,COLSE
//DB 01H,0C7H,22H,82H,0C4H,88H,08H,0C3H,00H,80H;带小数点的字形码0.,1.,-----9.

uchar code table[]={     //键盘编码"1~F~0"
0xD7,0x32,0x92,0xD4,
0x98,0x18,0xD1,0x10,
0x90,0x50,0x1C,0x39,
0x16,0x38,0x78,0x11};
uchar num,temp,num1;
void delay(uint z)      //延时子程序 Zms 
{
 uint x,y;
 for(x=z;x>0;x--)
  for(y=110;y>0;y--);
}
uchar keyscan();       //键盘函数声明
void display(uchar aa);//显示函数声明
void main()            //主函数
{
 
 while(1)
  {
   display(keyscan());
  }
}
void display(uchar aa)    //显示子程序
{
   //dula=1;
   //P0=table[aa-1];
   //dula=0;
            SBUF=table[aa-1];
}
uchar keyscan()   //键盘扫描程序,取回一个键盘号
{
   duank=0xfe;
   temp=duank;
   temp=temp&0xf0;
   while(temp!=0xf0)
    {
     delay(5);
     temp=duank;
     temp=temp&0xf0;
     while(temp!=0xf0)
     {
      temp=duank;
     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=duank;
       temp=temp&0xf0;
      }
     }
    }

   duank=0xfd;
   temp=duank;
   temp=temp&0xf0;
   while(temp!=0xf0)
    {
     delay(5);
     temp=duank;
     temp=temp&0xf0;
     while(temp!=0xf0)
     {
      temp=duank;
     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=duank;
       temp=temp&0xf0;
      }
     }
    }

   duank=0xfb;
   temp=duank;
   temp=temp&0xf0;
   while(temp!=0xf0)
    {
     delay(5);
     temp=duank;
     temp=temp&0xf0;
     while(temp!=0xf0)
     {
      temp=duank;
     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=duank;
       temp=temp&0xf0;
      }
     }
    }

   duank=0xf7;
   temp=duank;
   temp=temp&0xf0;
   while(temp!=0xf0)
    {
     delay(5);
     temp=duank;
     temp=temp&0xf0;
     while(temp!=0xf0)
     {
      temp=duank;
     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=duank;
       temp=temp&0xf0;
      }
     }
    }
return num;

}