ds18b20du.lst

ds1820 温度测量仿真

C51 COMPILER V7.09   DS18B20DU                                                             08/02/2007 10:54:43 PAGE 1   


C51 COMPILER V7.09, COMPILATION OF MODULE DS18B20DU
OBJECT MODULE PLACED IN ds18b20du.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE ds18b20du.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          #include "reg51.h"
   2          sbit DQ =P3^3;   //定义通信端口
   3          unsigned char A1,A2,A3,A2t,dispno;
   4          unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x00};
   5          unsigned int temp1;
   6          //延时函数
   7          void delay(unsigned int i)
   8          {
   9   1       while(i--);
  10   1      }
  11          //初始化函数
  12          Init_DS18B20(void)
  13          {
  14   1       unsigned char x=0;
  15   1       DQ = 1;    //DQ复位
  16   1       delay(8);  //稍做延时
  17   1       DQ = 0;    //单片机将DQ拉低
  18   1       delay(97); //精确延时 大于 480us
  19   1       DQ = 1;    //拉高总线
  20   1       delay(14);
  21   1       x=DQ;      //稍做延时后 如果x=0则初始化成功 x=1则初始化失败
  22   1       delay(20);
  23   1      }
  24          //读一个字节
  25          ReadOneChar(void)
  26          {
  27   1      unsigned char i=0;
  28   1      unsigned char dat = 0;
  29   1      for (i=8;i>0;i--)
  30   1       {
  31   2        DQ = 0; // 给脉冲信号
  32   2        dat>>=1;
  33   2        DQ = 1; // 给脉冲信号
  34   2        if(DQ)
  35   2         dat|=0x80;
  36   2        delay(4);
  37   2       }
  38   1       return(dat);
  39   1      }
  40          //写一个字节
  41          WriteOneChar(unsigned char dat)
  42          {
  43   1       unsigned char i=0;
  44   1       for (i=8; i>0; i--)
  45   1       {
  46   2        DQ = 0;
  47   2        DQ = dat&0x01;
  48   2        delay(5);
  49   2        DQ = 1;
  50   2        dat>>=1;
  51   2       }
  52   1      delay(4);
  53   1      }
  54          //读取温度
  55          ReadTemperature(void)
C51 COMPILER V7.09   DS18B20DU                                                             08/02/2007 10:54:43 PAGE 2   

  56          {
  57   1      unsigned char a=0;
  58   1      unsigned char b=0;
  59   1      unsigned int t=0;
  60   1      float tt=0;
  61   1      Init_DS18B20();
  62   1      WriteOneChar(0xCC); // 跳过读序号列号的操作
  63   1      WriteOneChar(0x44); // 启动温度转换
  64   1      Init_DS18B20();
  65   1      WriteOneChar(0xCC); //跳过读序号列号的操作
  66   1      WriteOneChar(0xBE); //读取温度寄存器等（共可读9个寄存器） 前两个就是温度
  67   1      a=ReadOneChar();
  68   1      b=ReadOneChar();
  69   1      t=b;
  70   1      t<<=8;
  71   1      t=t|a;
  72   1      tt=t*0.0625;
  73   1      t= tt*10+0.5; //放大10倍输出并四舍五入---此行没用
  74   1      return(t);
  75   1      }
  76          main()
  77          {
  78   1       TMOD=0x01;
  79   1       TH0=64536/256;
  80   1       TL0=64536%256;
  81   1       ET0=1;
  82   1       EA=1;
  83   1       TR0=1;
  84   1              while(1)
  85   1                {            
  86   2                              temp1=ReadTemperature();
  87   2                              A1=temp1/100; 
  88   2                      A2t=temp1%100; 
  89   2                      A2=A2t/10; 
  90   2                      A3=A2t%10;
  91   2              }
  92   1       
  93   1       }
  94          
  95          void timer0(void) interrupt 1 using 1
  96          {       
  97   1              TH0=64536/256;
  98   1              TL0=64536%256;
  99   1              P0=0x00;
 100   1              P2|=0x0f;
 101   1              switch(dispno)
 102   1              {
 103   2                      case 0: P2=0xfe;P0=table[A1];break;
 104   2                      case 1: P2=0xfd;P0=table[A2];break;
 105   2                      case 2: P2=0xfb;P0=0X63;break;
 106   2                      case 3: P2=0xf7;P0=0x39;break;
 107   2                      
 108   2                      default:                     break;
 109   2               }
 110   1              if(++dispno>3) dispno=0;
 111   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    370    ----
   CONSTANT SIZE    =     11    ----
   XDATA SIZE       =   ----    ----
C51 COMPILER V7.09   DS18B20DU                                                             08/02/2007 10:54:43 PAGE 3   

   PDATA SIZE       =   ----    ----
   DATA SIZE        =      7       4
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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