请看看我这个程序那错了?

1万 · 2008-7-28 15:54

在P1口接的4*4键盘,P0口接一位8段共阴极数码管,P2.0接公共阴极,想在按下某个键后,数码管显示对应的数字.程序如下,(结果编译可以通过但在实验板上实验时不显示数字,请帮忙指出错误,谢谢!!!!!)
#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
uchar wordcode[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
void delay(uint delaytime)
{
  uint i;
  for(;delaytime>0;delaytime--)
   {
     for(i=0;i<125;i++)
      {;;}
      }
}

keyscan( )
{
  uint scancode,temp;
  while(1)
  {
    P1=0xf0;
    if((P1&0xf0)!=0xf0)
    {
     delay(10);
     if((P1&0xf0)!=0xf0)
      {
        scancode=0xfe;
        while((P1&0x10)!=0)
         {

             P1=scancode;
            if((P1&0xf0)!=0xf0)
              {
                temp=P1;
                     return(temp);
                }
              else scancode=(scancode<<1)|0x01;
          }
        }
    }
  }

}

uchar getkeyvalue( )
{
uint i,k;
k=keyscan();
switch    (k)
{
case  0xee:    i==0; break;
case  0xde:    i==1; break;
case  0xbe:    i==2; break;
case  0x7e:    i==3; break;
case  0xed:    i==4; break;
case  0xdd:    i==5; break;
case  0xbd:    i==6; break;
case  0x7d:    i==7; break;
case  0xeb:    i==8; break;
case  0xdb:    i==9; break;
default: break;
  }
  return (i);
}
void main()
{
  uchar j;
  P2=0xfe;
  j=getkeyvalue();
  P0=wordcode[j];
}