C51 COMPILER V9.60.7.0   ONEWIRE                                                           04/15/2025 20:33:28 PAGE 1   


C51 COMPILER V9.60.7.0, COMPILATION OF MODULE ONEWIRE
OBJECT MODULE PLACED IN .\Objects\onewire.obj
COMPILER INVOKED BY: C:\Users\ZBright\AppData\Local\Keil_v5\C51\BIN\C51.EXE ..\Driver\onewire.c OPTIMIZE(8,SPEED) BROWSE
                    - INCDIR(..\Driver) DEBUG OBJECTEXTEND PRINT(.\Listings\onewire.lst) OBJECT(.\Objects\onewire.obj)

line level    source

   1          /*      #       单总线代码片段说明
   2                  1.      本文件夹中提供的驱动代码供参赛选手完成程序设计参考。
   3                  2.      参赛选手可以自行编写相关代码或以该代码为基础，根据所选单片机类型、�
             -�行速度和试题
   4                          中对单片机时钟频率的要求，进行代码调试和修改。
   5          */
   6          
   7          #include <onewire.h>
   8          
   9          sbit DQ = P1^4;
  10          
  11          //
  12          void Delay_OneWire(unsigned int t)  
  13          {
  14   1              unsigned char i;
  15   1              while(t--){
  16   2                      for(i=0;i<12;i++);
  17   2              }
  18   1      }
  19          
  20          //
  21          void Write_DS18B20(unsigned char dat)
  22          {
  23   1              unsigned char i;
  24   1              for(i=0;i<8;i++)
  25   1              {
  26   2                      DQ = 0;
  27   2                      DQ = dat&0x01;
  28   2                      Delay_OneWire(5);
  29   2                      DQ = 1;
  30   2                      dat >>= 1;
  31   2              }
  32   1              Delay_OneWire(5);
  33   1      }
  34          
  35          //
  36          unsigned char Read_DS18B20(void)
  37          {
  38   1              unsigned char i;
  39   1              unsigned char dat;
  40   1        
  41   1              for(i=0;i<8;i++)
  42   1              {
  43   2                      DQ = 0;
  44   2                      dat >>= 1;
  45   2                      DQ = 1;
  46   2                      if(DQ)
  47   2                      {
  48   3                              dat |= 0x80;
  49   3                      }           
  50   2                      Delay_OneWire(5);
  51   2              }
  52   1              return dat;
  53   1      }
C51 COMPILER V9.60.7.0   ONEWIRE                                                           04/15/2025 20:33:28 PAGE 2   

  54          
  55          //
  56          bit init_ds18b20(void)
  57          {
  58   1              bit initflag = 0;
  59   1              
  60   1              DQ = 1;
  61   1              Delay_OneWire(12);
  62   1              DQ = 0;
  63   1              Delay_OneWire(80);
  64   1              DQ = 1;
  65   1              Delay_OneWire(10); 
  66   1          initflag = DQ;     
  67   1              Delay_OneWire(5);
  68   1        
  69   1              return initflag;
  70   1      }
  71          
  72          float Tempr_Read()
  73          {
  74   1              unsigned char low;
  75   1              unsigned char high;
  76   1              
  77   1              init_ds18b20();
  78   1              Write_DS18B20(0xcc);
  79   1              Write_DS18B20(0x44);
  80   1              Delay_OneWire(200);
  81   1              
  82   1              init_ds18b20();
  83   1              Write_DS18B20(0xcc);
  84   1              Write_DS18B20(0xbe);
  85   1              
  86   1              low = Read_DS18B20();
  87   1              high = Read_DS18B20();
  88   1              
  89   1              return ((high << 8) | low) /16.0;
  90   1      
  91   1      }
  92          
  93          
  94          
  95          
  96          
  97          
  98          
  99          
 100          
 101          
 102          
 103          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    180    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----       1
END OF MODULE INFORMATION.


C51 COMPILATION COMPLETE.  0 WARNING(S),  0 ERROR(S)