帮我看一下这单片机程序，谢谢

只看该作者 · 2011-5-25 19:48

#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
uchar aa,numdu,shu,s,h2,h1,m1,m2;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
void display(uchar ,uchar ,uchar,uchar);
void main()
{ shu=1;
numdu=0;
  P2=0x0f;
  s=0;
aa=0;
TMOD=0x01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
EA=1;
ET0=1;
TR0=1;
while(1)
{
   display ( h2,h1,m2, m1);

}

}



void timer0() interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
aa++;
      if(aa==20)
{

aa=0;
s=s+1;

   if(s==60)
   {  s=0;
   h2=shu*0;
   h1=shu*0;
   m2=shu*0;
   m1=shu;
   shu++ ;
      }
      }
}
   void display(uchar m1,uchar m2,uchar h1,uchar h2)
{

      P0=table[m1];
   P0=table[m2];

   P0=table[h1];

   P0=table[h2];
}
   我想四个数码管，前三个显示0，最后一个从零到九，但显示不出，问原因