C51 COMPILER V9.60.7.0   ONEWIRE                                                           03/10/2025 18:03:54 PAGE 1   


C51 COMPILER V9.60.7.0, COMPILATION OF MODULE ONEWIRE
OBJECT MODULE PLACED IN .\Objects\onewire.obj
COMPILER INVOKED BY: D:\Keil_v5\C51\BIN\C51.EXE ..\driver\onewire.c OPTIMIZE(8,SPEED) BROWSE INCDIR(..\driver;..\user) D
                    -EBUG OBJECTEXTEND PRINT(.\Listings\onewire.lst) TABS(2) 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.
   4             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、运�
             -��速度和试题
   5                          中对单片机时钟频率的要求，进行代码调试和修改。
   6          */
   7          #include "onewire.h"
   8          sbit DQ = P1 ^ 4;
   9          //
  10          void Delay_OneWire(unsigned int t) {
  11   1        unsigned char i;
  12   1        while (t--) {
  13   2          for (i = 0; i < 12; i++);
  14   2        }
  15   1      }
  16          
  17          //
  18          void Write_DS18B20(unsigned char dat) {
  19   1        unsigned char i;
  20   1        for (i = 0; i < 8; i++) {
  21   2          DQ = 0;
  22   2          DQ = dat & 0x01;
  23   2          Delay_OneWire(5);
  24   2          DQ = 1;
  25   2          dat >>= 1;
  26   2        }
  27   1        Delay_OneWire(5);
  28   1      }
  29          
  30          //
  31          unsigned char Read_DS18B20(void) {
  32   1        unsigned char i;
  33   1        unsigned char dat;
  34   1      
  35   1        for (i = 0; i < 8; i++) {
  36   2          DQ = 0;
  37   2          dat >>= 1;
  38   2          DQ = 1;
  39   2          if (DQ) {
  40   3            dat |= 0x80;
  41   3          }
  42   2          Delay_OneWire(5);
  43   2        }
  44   1        return dat;
  45   1      }
  46          
  47          //
  48          bit init_ds18b20(void) {
  49   1        bit initflag = 0;
  50   1      
  51   1        DQ = 1;
  52   1        Delay_OneWire(12);
  53   1        DQ = 0;
C51 COMPILER V9.60.7.0   ONEWIRE                                                           03/10/2025 18:03:54 PAGE 2   

  54   1        Delay_OneWire(80);
  55   1        DQ = 1;
  56   1        Delay_OneWire(10);
  57   1        initflag = DQ;
  58   1        Delay_OneWire(5);
  59   1      
  60   1        return initflag;
  61   1      }
  62          
  63          float rd_temperature() {
  64   1        unsigned char low, high;
  65   1        init_ds18b20();
  66   1        Write_DS18B20(0xcc);
  67   1        Write_DS18B20(0x44);
  68   1      
  69   1        Delay_OneWire(200);
  70   1      
  71   1        init_ds18b20();
  72   1        Write_DS18B20(0xcc);
  73   1        Write_DS18B20(0xbe);
  74   1        low = Read_DS18B20();
  75   1        high = Read_DS18B20();
  76   1        return (float)(high << 8 | low) * 0.0625;
  77   1      }


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)