做一个仿真的电压表，用1602显示，发现啥都没有，编译和仿真都没报错，这是怎么回事？

`#include
#include
#define uchar unsigned char
#define uint  unsigned int
***it cs=P3^5;
***it clk=P3^3;
***it dati=P3^4;
***it dato=P3^4;
***it lcden=P2^3;
***it lcdrs=P2^5;
***it dula =P2^6;
***it wela=P2^7;
uchar dat=0x00;
uchar count=0x00;
uchar numu;
uchar CH;
uchar dis[]={0x01,0x02,0x03,0x04};
uchar  code tab[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
uchar  code tablewe[]={0xfd,0xfb,0xf7,0xf0,0xdf,0xfe};
uchar table[3];
//adc0832初始化函数，用途读入数据
uchar adc0832(uchar CH)
{ uchar i,test,adval;
  adval=0x00;
  test=0x00;
  clk=0;
  dati=1;
  _nop_();cs=0; _nop_();clk=1;_nop_();
  if(CH==0x00)
  { clk=0;
dati=1;
_nop_();
clk=1;
_nop_();
clk=0;
dati=0;
_nop_();
clk=1;
_nop_();
}
else {
   clk=0;
   dati=1;
   _nop_();
   clk=1;
   _nop_();
   clk=1;
   _nop_();
   clk=0;
   dati=1;
_nop_();
clk=1;
_nop_();
}
clk=0;
      dati=1;
for(i=0;i<8;i++)
{_nop_();
      adval<<=1;
      clk=1;
_nop_();
      clk=0;
if(dato) adval|=0x01;

   else adval|=0x00;
}
   for(i=0;i<8;i++)
   {test>>=1;
   if(dato) test|=0x80;
   else test|=0x00;
   _nop_();
   clk=1;
   _nop_();
   clk=0;
      }
if(adval==test)
      dat=test;_nop_();
cs=1;
dato=1;clk=1;return dat;}

void delay1(uint z)
{
   uint x,y;
   for(x=z;x>0;x--)
   for(y=110;y>0;y--);
}

//写命令操作函数
void write_com(uchar com)
{
   lcdrs =0;
   P0=com;
   delay1(5);
   lcden=1;
   delay1(5);
   lcden=0;

}

//写数据操作函数
void write_data(uchar date)
{
   lcdrs=1;
   P0=date;
   delay1(5);
   lcden=1;
   delay1(5);
   lcden=0;
}
//对显示频进行初始化函数
void init()
{
dula=0;
wela =0;
lcden =0;
write_com(0x38);
write_com(0x0c);
write_com(0x06);
write_com(0x01);
}
void delay(void)//延时函数
{uint r;
  for(r=10;r<500;r++)
   ;
   }

//原取数字函数
void convdata(uchar i)
{ dis[0]=i/51;
  dis[1]=(i%51)*10/51;
  dis[2]=((i%51)*10%51)*10/51;
  }
//显示函数
void display(void)
{
table[0]=tab[dis[0]];
delay();
table[1]='.';
table[2]=tab[dis[1]];
delay();
P2=0x08;
table[3]=tab[dis[2]];
delay();
write_com(80);
for(numu=0;numu<16;numu++)
   {
      if (numu==8||numu==11||numu==10||numu==9)
      {
         write_data(table[numu-8]);
            delay1(5);
         }
      else write_data(' ');
   }

}
//主函数
void main(void)
{ P2=0xff;
P0=0xff;
delay();
delay();
CH=0x00;
TMOD=0x01;
TH0=15535/256;
TL0=15536%256;
IE=0x82;
TR0=1;
init();
while(1)
{dat=adc0832(CH);
convdata(dat);
display();
}}
void timero(void) interrupt 1
{  TMOD=0x01;
TMOD=0x01;
TH0=15535/256;
TL0=15536%256;
IE=0x82;
TR0=1;
count++;
if(count==0x01)
{count=0x00;dat=adc0832(CH);}}

`