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P1 = (P1 & 0XF0) | i

oh_耗子 2018-10-21 浏览量：1180

#include<reg51.h>

sbit keyout1 = P2^7;
sbit keyout2 = P2^6;
sbit keyout3 = P2^5;
sbit keyout4 = P2^4;
sbit keyin1 = P2^3;
sbit keyin2 = P2^2;
sbit keyin3 = P2^1;
sbit keyin4 = P2^0;

unsigned char code LED[] = {0xfc 0x60 0xda 0xf2 0x66 0xb9 0xbe 0xe0
                              0xfe 0xf6 0xee 0xfe 0x9c 0xfc 0x9e 0x8E};
unsigned char code keymap[4][4] = {{ 0x31 0x32 0x33 0x26 } //Êý×Ö¼ü1¡¢Êý×Ö¼ü2¡¢Êý×Ö¼ü3¡¢ÏòÉÏ¼ü
                                   { 0x34 0x35 0x36 0x25 } //Êý×Ö¼ü4¡¢Êý×Ö¼ü5¡¢Êý×Ö¼ü6¡¢Ïò×ó¼ü
                                   { 0x37 0x38 0x39 0x28 } //Êý×Ö¼ü7¡¢Êý×Ö¼ü8¡¢Êý×Ö¼ü9¡¢ÏòÏÂ¼ü
                                   { 0x30 0x1B 0x0D 0x27 } //Êý×Ö¼ü0¡¢ESC¼ü¡¢ »Ø³µ¼ü¡¢ ÏòÓÒ¼ü
                                  };
unsigned char keysta[4][4] = {{1111}{1111}{1111}{1111}};
unsigned char Ledbuf[] = {0x00 0x00 0x00 0x00 0x000x000x000x00}; //ÊýÂë¹Ü¿ª¹ØÏû³ý¹íÓ°

void ShowNumber(unsigned long num);
void keyaction(unsigned char keycode);
void keydriver();
void keyscan();
void ledscan();

int main()
{
   TMOD &= 0XF0;
   TMOD |= 0X01;
   TH0 = 0XFC;
   TL0 = 0X18;
   EA = 1;
   ET0 = 1;
   TR0 = 1;
   Ledbuf[0] = LED[0];

   while(1)
   {
      keydriver();
   }
}
void ShowNumber(unsigned long num)
{
signed int a;
   unsigned char buf[8];

   for(a = 0; a < 8; a++)
   {
      buf[a] = num % 10;
       num = num / 10;
   }
   for(a = 8; a >= 1; a--)
   {
      if(buf[a] == 0)
       {
          Ledbuf[a] = 0x00;
       }
       else
       {
          break;
       }
       for(; a >= 0; a--)
       {
           Ledbuf [a]= LED[buf[a]];
       }
   }
}
void keyaction(unsigned char keycode)
{
static unsigned char add;
   static unsigned char result;

   if((keycode >= 0x30) && (keycode <= 0x39))
   {
      add = (add * 10) + (keycode - 0x30); //°Ñ¼üÅÌÂë±ä³É
       ShowNumber(add);
   }
   else if(keycode == 0x26)
   {
      result += add;
    add = 0;
    ShowNumber(result);
   }
   else if(keycode == 0x0d)
   {
      result += add;
       add = 0;
       ShowNumber(result);
   }
   else if(keycode == 0x1d)
   {
      result =0;
       add = 0;
       ShowNumber(add);
   }
}
void keydriver()
{
   unsigned char j i;
unsigned char backup[4][4] = {{1111}{1111}{1111}{1111}};

   for(i = 0; i < 4; i++)
   for(j = 0; j < 4; j++)
      {
          if(keysta[i][j] != backup[i][j])
           {
              if(backup == 0)
               {
                   keyaction(keymap[i][j]);
               }
               backup[i][j] = keysta[i][j];
           }
           //backup[i][j] = keysta[i][j];
       }
}
void keyscan()
{
   unsigned char i;
   unsigned char keyout = 0;
   static unsigned char keybuf[4][4] = {{0xff 0xff 0xff 0xff}
                                         {0xff 0xff 0xff 0xff}
                                         {0xff 0xff 0xff 0xff}
                                         {0xff 0xff 0xff 0xff}
                                        };

   //¾ØÕó°´¼üÉ¨Ãè»º³å
    //½«Ò»ÐÐËÄ¸ö°´¼üÖµÒÆÈë»º³åÇø£¬Íê³ÉÏû¶¶
    keybuf[keyout][0] = (keybuf[keyout][0] << 1) | keyin1;
      keybuf[keyout][1] = (keybuf[keyout][1] << 1) | keyin2;
       keybuf[keyout][2] = (keybuf[keyout][2] << 1) | keyin3;
       keybuf[keyout][3] = (keybuf[keyout][3] << 1) | keyin4;

       for(i = 0; i < 4; i++)
                                                           //Ã¿ÐÐËÄ¸ö°´¼üËùÒÔÑ»·ËÄ´Î
       {
          if((keybuf[keyout][i] & 0x0f) == 0x00) //Á¬ÐøËÄ´ÎÉ¨ÃèÖµ¶¼ÊÇÁã£¬ËùÒÔ°´ÏÂ
           {
              keysta[keyout][i] = 0;
           }
           else if((keybuf[keyout][i] & 0x0f) == 0x0f)
           {
              keysta[keyout][i] = 1;
           }
       }
       keyout++;         //ÏÂÒ»ÐÐÉ¨Ãè
       keyout &= 0x03; // ÖØÐÂ¿ªÊ¼Ò»´ÎÉ¨Ãè

       switch(keyout)
       {
          case 0: keyout4 = 1; keyout1 = 0; break;
           case 1: keyout1 = 1; keyout2 = 0; break;
           case 2: keyout2 = 1; keyout3 = 0; break;
           case 3: keyout3 = 1; keyout4 = 0; break;
           default: break;
       }
}
void ledscan()
{
static unsigned char i = 0;

   P0 = 0x00; //ÏûÒþ

   //P1 = (P1 & 0XF0) | i;
   P1 = 0XF0;
   P0 = Ledbuf[i];
   if(i < 8)
   {
      i++;
   }
   else
   {
      i = 0;
   }
}
void InterruptTimer0() interrupt 1 //½øÈëÖÐ¶Ï1ms£¬Íê³É¼üÅÌµÄÉ¨ÃèºÍÊýÂë¹ÜÏÔÊ¾
{
TH0 = 0XFC;
   TL0 = 0X18;

   keyscan();
ledscan();
}

为什么C51和C52执行上面的程序是两种结果

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