EEPW论坛

我这里有一个程序，
#include<reg51.h>
#define rowkey() (~P2)&0x0f//键盘输入端
#define OUT P0                  //数码管显示输出端
unsigned char code TAB[]=
{  0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,
   0x88,0x83,0xC6,0xA1,0x86,0x8E,0x89,0xC7,0xC8,0xC1,
   0x8C,0xA3,0xBF,0xFF,0xFF
};

void debouncer()
{ int i;
for(i=0;i<2400;i++);
}

void scanner()//键盘扫描程序
{ unsigned char data row,col;
unsigned char data scan;
unsigned char data keyin;
scan=0xef;
for(row=0;row<4;row++)
{ P2=scan;
  keyin=rowkey();
  debouncer();
  if(keyin!=0)
  { for(col=0;col<4;col++)
   { keyin>>=1;
    if(CY)
    { OUT=TAB[col*4+row];//数码管显示
     break;
    }
   }
  }
  scan=(scan<<1)|0x01;
}

}
void main()
{ while(1)
{ scanner();
}
}