keil c51

#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit dula=P2^6;
sbit wela=P2^7;
sbit key1=P3^4;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71,0};
uchar num,temp,num1;
void delay(uint z)
{
 uint x,y;
 for(x=z;x>0;x--)
  for(y=110;y>0;y--);
}
uchar keyscan();
void display(uchar aa);
void main()
{
 num=17;
 dula=1;
 P0=0;
 dula=0;
 wela=1;
 P0=0xc0;
 wela=0;
 
 while(1)
  {
   display(keyscan());
  }
}
void display(uchar aa)
{
   dula=1;
   P0=table[aa-1];
   dula=0;  
}
uchar 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;

}

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

                                             //键盘（矩阵键盘扫描）
#include<reg52.h>
#define uchar unsigned char
sbit duan=P2^6;
sbit wei=P2^7;
uchar temp;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71,
0x76,0x79,0x38,0x3f};
void display(uchar);

void main()
{
 while(1)
  {
   P3=0xfe;                    //P3口赋值 11111110
            temp=P3;                    //P3赋给temp，当按下键盘时，P3值改变，temp用于保存键盘输入数据
   
   while(temp!=0xfe)              //当if语句条件满足时，说明已经按了键盘改变数据
    {
                 switch(temp)
      {
        case 0xee: display(0);
                               break;          //按1键时，11101110；调用子函数，数码管显示数字1
       case 0xde: display(1);
                                 break;
       case 0xbe: display(2);
                               break;
          case 0x7e: display(3);
                                 break;
       default:                break;
      } 
         while(temp!=0xfe)
             {
         temp=P3;                               //跳出大循环
        }
    }
        } 
}

void display(uchar x)
{
 wei=1;                               
 P1=0x00;
 wei=0;
 duan=1;
 P1=table[x];
}

上面是网上找的，关于单片机键盘控制程序，16个都编入了；

下面是我自己写的，比较简单，只有上排4个按键编入了；

我没有单片机，有高手知道不知道我编的能不能实现按键功能

你自己写的程序可以实现4位按键的键盘扫描。default:后面没必要加break;，直接分号就可以了。

你在网上找的那个貌似是郭天祥教程里的。

自己用PROTEUS仿真啊。。这么长谁看啊。

扫描键位时前四位和后四位是分开的，你的例子中就把后四位屏蔽掉了！