在四位共阳极数码管上显示键盘输入

#include<reg51.h>

#define uint unsigned int

#define uchar unsigned char

bit flag;

unsigned char key_scannum[] = {0xef,0xdf,0xbf,0x7f};

unsigned char table[]= {0xee,0xed,0xeb,0xe7,0xde,0xdd,0xdb,0xd7,0xbe,0xbd,0xbb,0xb7,0x7e,0x7d,0x7b,0x77};//?ü?ì°′?ü??

unsigned char led[] = {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xff}; //P0?ú????±à??

void delay(uint x) //?óê±3ìDò

{

uint y;

for(x;x>0;x--)

for(y=0;y<100;y++);

}

unsigned char keyscan(void)//?ü?ìé¨?è?μoˉêy

{

unsigned char i,j;

P1=0x0f;//?ì2éê?·?óD?ü°′??

if(P1！=0x0f)//±íê?óD°′?ü°′??

   {

     delay(1);  //è￥??

if(P1！=0x0f)

  for(i = 0;i < 4;i++)

  {

P1 = key_scannum;

if(P1 ！= key_scannum)//′?DDóD?ü°′??

for(j = 0;j < 16;j++)

{

if(P1 == table[j])

{

flag=1;

   return(j);

}

  }

  }

}

while((P1 & 0x0f)<0x0f);

return(0);

}