DS18B20的程序，程序编译没有问题，就是烧录进去没有反应

ti

#include
#include

#define uchar unsigned char
#define uint  unsigned int

***it LCD_RS = P2^6;
***it LCD_RW = P2^5;
***it LCD_EP = P2^7;
***it D18B20=P3^7;

bit  flag;
unsigned int  idata Temperature;
unsigned char idata temp_buff[9]; //存储读取的字节，read scratchpad为9字节，read rom ID为8字节
unsigned char idata id_buff[8];
unsigned char idata *p,tiM;
unsigned char idata crc_data;
typedef unsigned char BYTE;
typedef bit BOOL;
unsigned long  wendu[5],LedNumVal;
void WriteCommandLCM(unsigned char WCLCM,BuysC);
void WriteDataLCM(unsigned char WDLCM);

unsigned char code CrcTable [256]={
0,  94, 188,  226,  97,  63,  221,  131,  194,  156,  126,  32,  163,  253,  31,  65,
157,  195,  33,  127,  252,  162,  64,  30,  95,  1,  227,  189,  62,  96,  130,  220,
35,  125,  159,  193,  66,  28,  254,  160,  225,  191,  93,  3,  128,  222,  60,  98,
190,  224,  2,  92,  223,  129,  99,  61,  124,  34,  192,  158,  29,  67,  161,  255,
70,  24,  250,  164,  39,  121,  155,  197,  132,  218,  56,  102,  229,  187,  89,  7,
219,  133, 103,  57,  186,  228,  6,  88,  25,  71,  165,  251,  120,  38,  196,  154,
101,  59, 217,  135,  4,  90,  184,  230,  167,  249,  27,  69,  198,  152,  122,  36,
248,  166, 68,  26,  153,  199,  37,  123,  58,  100,  134,  216,  91,  5,  231,  185,
140,  210, 48,  110,  237,  179,  81,  15,  78,  16,  242,  172,  47,  113,  147,  205,
17,  79,  173,  243,  112,  46,  204,  146,  211,  141,  111,  49,  178,  236,  14,  80,
175,  241, 19,  77,  206,  144,  114,  44,  109,  51,  209,  143,  12,  82,  176,  238,
50,  108,  142,  208,  83,  13,  239,  177,  240,  174,  76,  18,  145,  207,  45,  115,
202,  148, 118,  40,  171,  245,  23,  73,  8,  86,  180,  234,  105,  55,  213, 139,
87,  9,  235,  181,  54,  104,  138,  212,  149,  203,  41,  119,  244,  170,  72,  22,
233,  183,  85,  11,  136,  214,  52,  106,  43,  117,  151,  201,  74,  20,  246,  168,
116,  42,  200,  150,  21,  75,  169,  247,  182,  232,  10,  84,  215,  137,  107,  53};

unsigned char code ASCII[15] = {'0','1','2','3','4','5','6','7','8','9','.',' ','C'};

BYTE code dis1[] = {"wen du wei:"};

delay(int ms)
{
int i;
while(ms--)
{
  for(i = 0; i< 250; i++)
  {
_nop_();
_nop_();
_nop_();
_nop_();
  }
}
}

void TempDelay (unsigned char idata us)
{
      while(us--);
}

BOOL lcd_bz()
{                         // 测试LCD忙碌状态
BOOL result;
LCD_RS = 0;
LCD_RW = 1;
LCD_EP = 1;
_nop_();
_nop_();
_nop_();
_nop_();
result = (BOOL)(P0 & 0x80);
LCD_EP = 0;
return result;
}

lcd_wcmd(BYTE cmd)
{                         // 写入指令数据到LCD
//while(lcd_bz());
LCD_RS = 0;
LCD_RW = 0;
LCD_EP = 0;
_nop_();
_nop_();
P0 = cmd;
_nop_();
_nop_();
_nop_();
_nop_();
LCD_EP = 1;
_nop_();
_nop_();
_nop_();
_nop_();
LCD_EP = 0;
}

//按指定位置显示一个字符
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)
{
      Y &= 0x1;
      X &= 0xF; //限制X不能大于15，Y不能大于1
      if (Y) X |= 0x40; //当要显示第二行时地址码+0x40;
      X |= 0x80; //算出指令码
      WriteCommandLCM(X, 1); //发命令字
      WriteDataLCM(DData); //发数据
}

//按指定位置显示一串字符
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData)
{
      unsigned char ListLength;

  ListLength = 0;
      Y &= 0x1;
      X &= 0xF; //限制X不能大于15，Y不能大于1
      while (DData[ListLength]>0x19) //若到达字串尾则退出
            {
                     if (X <= 0xF) //X坐标应小于0xF
                              {
                                    DisplayOneChar(X, Y, DData[ListLength]); //显示单个字符
                                    ListLength++;
                                    X++;
                              }
            }
}

lcd_wdat(BYTE dat)
{                         //写入字符显示数据到LCD
while(lcd_bz());
LCD_RS = 1;
LCD_RW = 0;
LCD_EP = 0;
P0 = dat;
_nop_();
_nop_();
_nop_();
_nop_();
LCD_EP = 1;
_nop_();
_nop_();
_nop_();
_nop_();
LCD_EP = 0;
}

lcd_init()
{                      //LCD初始化设定
lcd_wcmd(0x38);       //16*2显示，5*7点阵，8位数据
delay(1);
lcd_wcmd(0x0c);       //显示开，关光标
delay(1);
lcd_wcmd(0x06);       //移动光标
delay(1);
lcd_wcmd(0x01);       //清除LCD的显示内容
delay(1);
}

void Init18b20 (void)
{
      D18B20=1;
      _nop_();
      D18B20=0;
      TempDelay(80); //delay 530 uS//80
      _nop_();
      D18B20=1;
      TempDelay(14); //delay 100 uS//14
      _nop_();
      _nop_();
      _nop_();

      if(D18B20==0)
            flag = 1; //detect 1820 success!
      else
            flag = 0; //detect 1820 fail!
      TempDelay(20);    //20
      _nop_();
      _nop_();
      D18B20 = 1;
}

/************************************************************
*Function:向18B20写入一个字节
*parameter:
*Return:
*Modify:
*************************************************************/
void WriteByte (unsigned char idata wr)  //单字节写入
{
      unsigned char idata i;
      for (i=0;i<8;i++)
      {
            D18B20 = 0;
            _nop_();
            D18B20=wr&0x01;
            TempDelay(3); //delay 45 uS //5
            _nop_();
            _nop_();
            D18B20=1;
            TempDelay(5);
            wr >>= 1;
      }
}

/************************************************************
*Function:读18B20的一个字节
*parameter:
*Return:
*Modify:
*************************************************************/
unsigned char ReadByte (void)    //读取单字节
{
      unsigned char idata i,u=0;
      for(i=0;i<8;i++)
      {
            D18B20 = 0;
            u >>= 1;
            D18B20 = 1;
            if(D18B20==1)
            u |= 0x80;
            TempDelay (2);
            _nop_();
      }
      return(u);
}

/************************************************************
*Function:读18B20
*parameter:
*Return:
*Modify:
*************************************************************/
void read_bytes (unsigned char idata j)
{
      unsigned char idata i;
      for(i=0;i       {
               *p = ReadByte();
               p++;
      }
}

/************************************************************
*Function:CRC校验
*parameter:
*Return:
*Modify:
*************************************************************/
unsigned char CRC (unsigned char j)
{
         unsigned char idata i,crc_data=0;
      for(i=0;i          crc_data = CrcTable[crc_data^temp_buff];
return (crc_data);
}

/************************************************************
*Function:读取温度
*parameter:
*Return:
*Modify:
*************************************************************/

void convert(void)
{
Init18b20();
WriteByte(0xcc);
WriteByte(0x44);

}

void GemTemp (void)
{
read_bytes (9);
if (CRC(9)==0) //校验正确
{
         Temperature = temp_buff[1]*0x100 + temp_buff[0];
//          Temperature *= 0.625;
            Temperature /= 16;
            TempDelay(1);
}
}

/************************************************************
*Function:内部配置
*parameter:
*Return:
*Modify:
*************************************************************/
void Config18b20 (void)  //重新配置报警限定值和分辨率
{
   Init18b20();
   WriteByte(0xcc);  //skip rom
   WriteByte(0x4e);  //write scratchpad
   WriteByte(0x19);  //上限
   WriteByte(0x1a);  //下限
   WriteByte(0x7f);    //set 12 bit (0.125)
   Init18b20();
   WriteByte(0xcc);  //skip rom
   WriteByte(0x48);  //保存设定值
   Init18b20();
   WriteByte(0xcc);  //skip rom
   WriteByte(0xb8);  //回调设定值
}

/************************************************************
*Function:读18B20ID
*parameter:
*Return:
*Modify:
*************************************************************/
void ReadID (void)//读取器件 id
{
      Init18b20();
      WriteByte(0x33);  //read rom
      read_bytes(8);
}

/************************************************************
*Function:18B20ID全处理
*parameter:
*Return:
*Modify:
*************************************************************/
void TemperatuerResult(void)
{
      p = id_buff;
      ReadID();
      Config18b20();
      Init18b20 ();
      WriteByte(0xcc); //skip rom
      WriteByte(0x44); //Temperature convert

      Init18b20 ();
      WriteByte(0xcc); //skip rom
      WriteByte(0xbe); //read Temperature
      p = temp_buff;
      GemTemp();
}

void conut()
{
   wendu[0]=Temperature%1000/100;
      wendu[1]=Temperature%1000%100/10;
      wendu[2]=Temperature%1000%100%10/1;
      wendu[4]=Temperature%1*10;
      DisplayOneChar(0, 1, ASCII[wendu[0]]);
      DisplayOneChar(1, 1, ASCII[wendu[1]]);
      DisplayOneChar(2, 1, ASCII[wendu[2]]);
      DisplayOneChar(3, 1, ASCII[11]);
      DisplayOneChar(4, 1, ASCII[13]);
}

void GetTemp()
{
   if(TIM==100) //每隔 1000ms 读取温度
      {  TIM=0;
         TemperatuerResult();
      }

}

main()
{
      BYTE i;
      lcd_init();
      convert();
      GetTemp();
      delay(250);
      delay(250);
      delay(250);
      while(1)
      {
            delay(10);
            convert();
            lcd_wdat(dis1);
            i++;
      LedNumVal=Temperature;
   count();

      }

}