C51 COMPILER V9.59.0.0   ONEWIRE                                                           02/24/2024 21:37:53 PAGE 1   


C51 COMPILER V9.59.0.0, 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) DEBUG OBJ
                    -ECTEXTEND 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.  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          #include "onewire.h"
   7          #include "REG52.H"
   8          sbit DQ = P1 ^ 4; // 单总线数据口
   9          //
  10          void Delay_OneWire(unsigned int t)
  11          {
  12   1        unsigned char i;
  13   1        while (t--)
  14   1        {
  15   2          for (i = 0; i < 12; i++)
  16   2            ;
  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 V9.59.0.0   ONEWIRE                                                           02/24/2024 21:37:53 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 rd_temperature()
  73          {
  74   1        unsigned char low, high;
  75   1        init_ds18b20();
  76   1        Write_DS18B20(0xcc); // 跳过ROM
  77   1        Write_DS18B20(0x44); // 启动温度转换
  78   1      
  79   1        init_ds18b20();
  80   1        Write_DS18B20(0xcc); // 跳过ROM
  81   1        Write_DS18B20(0xbe); // 读取温度值
  82   1        low = Read_DS18B20();
  83   1        high = Read_DS18B20();
  84   1        return (float)(high << 8 | low) * 0.0625;
  85   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    195    ----
   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)