为什么ds18b20的温度显示不正确？？？帮我看看程序呐！

#include
#include
#define uchar unsigned char
#define uint unsigned int
***it DQ=P1^4;
***it Data=P0^2;
***it shcp=P0^4;
***it stcp=P2^3;
code unsigned char duan[]={0xc0,0xf9,0xa4,0xb0,
0x99,0x92,0x82,0xf8,0x80,0x90,0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};//段的数字0123456789,+小数点的0123456789
code unsigned char wei[]={0x01,0x02,0x04,0x08,
0x10,0x20,0x40,0x80};//位的数字12345678
void delay00(unsigned int n)
{
  unsigned int i;
  while(n--);
  {
  i=200;
  while(i--);
  }
}
void delay(uchar n)//延时3us
{
while(n--);
}
unsigned char reset(void)
{
uchar fuwei;
DQ=0;
delay(180);
DQ=1;
delay(20);
if (!DQ)//说明存在
{
      fuwei = 1;
}
else//说明不存在
{
      fuwei = 0;
}
delay(160);
return fuwei;
}
void writebyte(uchar val)
{
uchar i;
for(i=0;i<8;i++)
{
if(val&0x01)
{
  DQ=0;
  delay(1);
  DQ=1;
  delay(20);
}
else
{
  DQ=0;
  delay(28);
  DQ=1;
  delay(1);
}
val>>=1;
}
}
uchar readbyte(void)
{
uchar i,value=0;
for(i=0;i<8;i++)
{
  value>>=1;
  DQ=0;
  delay(1);
  DQ=1;
  _nop_();
  if(DQ)
  {
value|=0x80;
  }
  else
  {
  }
  delay(25);
}
return value;
}
uchar hq(void)
{
unsigned int temper;
reset();
delay00(1);
writebyte(0xCC);
writebyte(0x44);
reset();
delay00(1);
writebyte(0xCC);
writebyte(0xBE);
temper=readbyte(); //读取便签的低字节（8位）
temper|=readbyte()<<8;//读取便签的高字节（8位）
return(temper);
}
void smg(unsigned char aa,unsigned char bb)
{
unsigned char i,duan1=duan[aa],wei1=wei[bb];
shcp=0;
stcp=0;
  for(i=0;i<8;i++)
  {
if(duan1&0x80)
{
   Data=1;
}
else
{
   Data=0;
}

  _nop_();
  shcp=1;
  _nop_();
  shcp=0;
  _nop_();
  duan1<<=1;
  }
  for(i=0;i<8;i++)
  {
if(wei1&0x80)
{
   Data=1;
}
else
{
   Data=0;
}

  _nop_();
  shcp=1;
  _nop_();
  shcp=0;
  _nop_();
  wei1<<=1;
  }
  stcp=1;
  stcp=0;
}
uchar wendu(uint ss)
{
float wendu0;
signed int wendu,wd1;
wendu0=ss*0.0625;
wd1=wendu0*10+0.5;
wendu=wd1+0.05;
return wendu;
}
void xs(signed int fff)
{
uchar cc,dd,ee;
cc=fff/100;
dd=fff%100/10;
ee=fff%100%10;
smg(cc,2);_nop_();
smg(dd+10,1);_nop_();
smg(ee,0);_nop_();
}
void main()
{
uint ww,i;
signed int gg;
while(1)
{
reset();
ww=hq();
gg=wendu(ww);
for(i=0;i<10;i++)
{
xs(gg);
}
}
}