C51 COMPILER V9.59.0.0   ONEWIRE                                                           05/02/2024 15:57:34 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          #include "intrins.h"
   9          sbit DQ = P1 ^ 4; // 单总线数据口
  10          void Delay4us(void) //@12.000MHz
  11          {
  12   1        unsigned char data i;
  13   1      
  14   1        _nop_();
  15   1        _nop_();
  16   1        i = 9;
  17   1        while (--i)
  18   1          ;
  19   1      }
  20          
  21          //
  22          void Delay_OneWire(unsigned int t)
  23          {
  24   1        unsigned char i;
  25   1        while (t--)
  26   1        {
  27   2          for (i = 0; i < 12; i++)
  28   2            ;
  29   2        }
  30   1      }
  31          
  32          //
  33          void Write_DS18B20(unsigned char dat)
  34          {
  35   1        unsigned char i;
  36   1        for (i = 0; i < 8; i++)
  37   1        {
  38   2          DQ = 0;
  39   2          DQ = dat & 0x01;
  40   2          Delay_OneWire(5);
  41   2          DQ = 1;
  42   2          dat >>= 1;
  43   2        }
  44   1        Delay_OneWire(5);
  45   1      }
  46          
  47          //
  48          unsigned char Read_DS18B20(void)
  49          {
  50   1        unsigned char i;
  51   1        unsigned char dat;
  52   1      
  53   1        for (i = 0; i < 8; i++)
C51 COMPILER V9.59.0.0   ONEWIRE                                                           05/02/2024 15:57:34 PAGE 2   

  54   1        {
  55   2          DQ = 0;
  56   2          dat >>= 1;
  57   2          DQ = 1;
  58   2          Delay4us();
  59   2          if (DQ)
  60   2          {
  61   3            dat |= 0x80;
  62   3          }
  63   2          Delay_OneWire(5);
  64   2        }
  65   1        return dat;
  66   1      }
  67          
  68          //
  69          bit init_ds18b20(void)
  70          {
  71   1        bit initflag = 0;
  72   1      
  73   1        DQ = 1;
  74   1        Delay_OneWire(12);
  75   1        DQ = 0;
  76   1        Delay_OneWire(80);
  77   1        DQ = 1;
  78   1        Delay_OneWire(10);
  79   1        initflag = DQ;
  80   1        Delay_OneWire(5);
  81   1      
  82   1        return initflag;
  83   1      }
  84          
  85          float rd_temperature()
  86          {
  87   1        unsigned char low, high;
  88   1        init_ds18b20();
  89   1        Write_DS18B20(0xcc); // 跳过ROM
  90   1        Write_DS18B20(0x44); // 启动温度转换
  91   1        Delay_OneWire(200);  // 等待温度转换
  92   1        init_ds18b20();
  93   1        Write_DS18B20(0xcc); // 跳过ROM
  94   1        Write_DS18B20(0xbe); // 读取温度值
  95   1        low = Read_DS18B20();
  96   1        high = Read_DS18B20();
  97   1        return (float)(high << 8 | low) * 0.0625;
  98   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    212    ----
   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)