ds.lst

ds18b20测温程序用于51单片机的。C语言编写的

C51 COMPILER V8.01   DS                                                                    11/02/2008 21:28:38 PAGE 1   


C51 COMPILER V8.01, COMPILATION OF MODULE DS
OBJECT MODULE PLACED IN ds.OBJ
COMPILER INVOKED BY: D:\stup\keil\C51\BIN\C51.EXE ds.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          #include<reg51.h>
   2          #define uchar unsigned char
   3          #define uint unsigened int
   4          uchar now;
   5          uchar temp,temp1,temp2;
   6          sbit DQ=P1^7;
   7          sbit P0_4=P0^4;
   8          sbit P0_5=P0^5;
   9          sbit P0_6=P0^6;
  10          
  11          uchar seg7code[]={0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x00};
  12          
  13          void delay_18B20(unsigned int i)
  14          {
  15   1              while(i--);
  16   1      }
  17          void delay(uchar x)
  18          {
  19   1              uchar a,b;
  20   1              for(a=80;a>0;a--)
  21   1                      for(b=x;b>0;b--);
  22   1      }
  23          
  24          uchar Init_DS18B20() 
  25          {
  26   1               unsigned char x=0;
  27   1               DQ = 1;          //DQ复位
  28   1               delay_18B20(8);  //稍做延时
  29   1               DQ = 0;          //单片机将DQ拉低
  30   1               delay_18B20(80); //精确延时 大于 480us
  31   1               DQ = 1;          //拉高总线
  32   1               delay_18B20(14);
  33   1               now=DQ;            //稍做延时后 如果x=0则初始化成功 x=1则初始化失败
  34   1               delay_18B20(20);
  35   1               return now;
  36   1      }
  37          
  38          /***********ds18b20读一个字节**************/  
  39          
  40          unsigned char ReadOneChar(void)
  41          {
  42   1              uchar i=0;
  43   1              uchar dat = 0;
  44   1              for (i=8;i>0;i--)
  45   1               {
  46   2                        DQ = 0; // 给脉冲信号
  47   2                        dat>>=1;
  48   2                        DQ = 1; // 给脉冲信号
  49   2                        if(DQ)
  50   2                        dat|=0x80;
  51   2                        delay_18B20(4);
  52   2               }
  53   1              return(dat);
  54   1      }
  55          
C51 COMPILER V8.01   DS                                                                    11/02/2008 21:28:38 PAGE 2   

  56          /*************ds18b20写一个字节****************/  
  57          
  58          void WriteOneChar(uchar dat)
  59          {
  60   1              unsigned char i=0;
  61   1              for (i=8; i>0; i--)
  62   1              {
  63   2                      DQ = 0;
  64   2                      DQ = dat&0x01;
  65   2              delay_18B20(5);
  66   2                      DQ = 1;
  67   2              dat>>=1;
  68   2       }
  69   1      }
  70          
  71          /**************读取ds18b20当前温度************/
  72          
  73          void ReadTemperature()
  74          {
  75   1              
  76   1              unsigned char a=0;
  77   1              unsigned char b=0;
  78   1      
  79   1              Init_DS18B20();
  80   1              WriteOneChar(0xCC);     // 跳过读序号列号的操作
  81   1              WriteOneChar(0x44);     // 启动温度转换
  82   1      
  83   1              delay_18B20(100);       // this message is wery important
  84   1      
  85   1              Init_DS18B20();
  86   1              WriteOneChar(0xCC);     //跳过读序号列号的操作
  87   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
  88   1      
  89   1              delay_18B20(100);
  90   1      
  91   1              a=ReadOneChar();        //读取温度值低位
  92   1              b=ReadOneChar();                //读取温度值高位
  93   1      
  94   1              temp1=b<<4;
  95   1              temp1+=(a&0xf0)>>4;//整数位
  96   1              temp2=a&0x0f; //小数位
  97   1         // temp=((b*256+a)>>4);    //当前采集温度值除16得实际温度值
  98   1          temp=b&0xf0; //正负数的确定 
  99   1      }
 100          void display(uchar bai,uchar shi,uchar ge,uchar xiao)
 101          { 
 102   1              ReadTemperature();
 103   1              P0=seg7code[bai];
 104   1              P0_4=0;
 105   1              P0_5=0;
 106   1              P0_6=1;
 107   1              delay(3);
 108   1      
 109   1              P0=seg7code[shi];
 110   1              P0_4=1;
 111   1              P0_5=0;
 112   1              P0_6=1;
 113   1              delay(3);
 114   1      
 115   1              P0=seg7code[ge];
 116   1              P0_4=0;
 117   1              P0_5=1;
C51 COMPILER V8.01   DS                                                                    11/02/2008 21:28:38 PAGE 3   

 118   1              P0_6=1;
 119   1              delay(3);
 120   1      
 121   1              P0=seg7code[xiao];
 122   1              P0_4=1;
 123   1              P0_5=1;
 124   1              P0_6=1;
 125   1              delay(3);
 126   1      }
 127          
 128          main()
 129          {
 130   1         //Init_DS18B20();
 131   1         while(1)
 132   1         {
 133   2                 display(temp1/100,temp1/10%10,temp1%10,temp2/10);;  
 134   2         }
 135   1      }
 136          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    317    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =     15       5
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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