temperature.lst

proteus实例集锦

C51 COMPILER V8.02   TEMPERATURE                                                           11/01/2006 20:56:43 PAGE 1   


C51 COMPILER V8.02, COMPILATION OF MODULE TEMPERATURE
OBJECT MODULE PLACED IN temperature.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE temperature.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          #include "reg51.h"
   2          
   3          char disp[11]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x40};
   4          char disp_dot[11]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,0x87,0xff,0xef,0xc0};
   5          
   6          sbit DQ = P1^3;   //定义通信端口 
   7          
   8          //晶振12MHz  
   9          void delay_18B20(unsigned int i)
  10          {
  11   1              while(i--);
  12   1      }
  13          
  14          //初始化函数
  15          Init_DS18B20(void) 
  16          {
  17   1               unsigned char x=0;
  18   1               DQ = 1;          //DQ复位
  19   1               delay_18B20(8);  //稍做延时
  20   1               DQ = 0;          //单片机将DQ拉低
  21   1               delay_18B20(80); //精确延时 大于 480us
  22   1               DQ = 1;          //拉高总线
  23   1               delay_18B20(14);
  24   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
  25   1               delay_18B20(20);
  26   1      }
  27          
  28          
  29          //读一个字节  
  30          ReadOneChar(void)
  31          {
  32   1              unsigned char i=0;
  33   1              unsigned char dat = 0;
  34   1              for (i=8;i>0;i--)
  35   1               {
  36   2                        DQ = 0; // 给脉冲信号
  37   2                        dat>>=1;
  38   2                        DQ = 1; // 给脉冲信号
  39   2                        if(DQ)
  40   2                        dat|=0x80;
  41   2                        delay_18B20(4);
  42   2               }
  43   1              return(dat);
  44   1      }
  45          
  46          //写一个字节  
  47          WriteOneChar(unsigned char dat)
  48          {
  49   1       unsigned char i=0;
  50   1       for (i=8; i>0; i--)
  51   1       {
  52   2        DQ = 0;
  53   2        DQ = dat&0x01;
  54   2        delay_18B20(5);
  55   2        DQ = 1;
C51 COMPILER V8.02   TEMPERATURE                                                           11/01/2006 20:56:43 PAGE 2   

  56   2        dat>>=1;
  57   2       }
  58   1      }
  59          
  60          //读取温度
  61          ReadTemperature(void)
  62          {
  63   1              unsigned char a=0;
  64   1              unsigned char b=0;
  65   1              unsigned int  t=0;
  66   1              
  67   1              Init_DS18B20();
  68   1              WriteOneChar(0xCC); // 跳过读序号列号的操作
  69   1              WriteOneChar(0x44); // 启动温度转换
  70   1              delay_18B20(100);
  71   1              Init_DS18B20();
  72   1              WriteOneChar(0xCC); //跳过读序号列号的操作
  73   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
  74   1              a=ReadOneChar();
  75   1              b=ReadOneChar();
  76   1                      
  77   1              //传感器返回值除16得实际温度值
  78   1              //为了得到2位小数位，先乘100，再除16，考虑整型数据长度，
  79   1              //技巧处理后先乘25，再除4，除4用右移实现
  80   1      
  81   1              t = (b*256+a)*25;       
  82   1              return( t >> 2  );
  83   1      }
  84          
  85          main()
  86          {
  87   1              unsigned int tmp;
  88   1              unsigned char counter;
  89   1              while(1)
  90   1              {
  91   2                      //温度测量频率没有必要太高，太高反而影响数码显示
  92   2                      //所以用计数器加以控制
  93   2                      if(counter-- == 0)
  94   2                      {
  95   3                              tmp = ReadTemperature();                        
  96   3                              counter = 20;
  97   3                      }
  98   2      
  99   2                      P2 = 0xff;
 100   2                      P0 = disp[tmp%10];
 101   2                      P2 = 0xfb;
 102   2                      delay_18B20(1000);
 103   2                      P2 = 0xff;
 104   2                      P0 = disp[tmp/10%10];
 105   2                      P2 = 0xf7;
 106   2                      delay_18B20(1000);
 107   2                      P2 = 0xff;
 108   2                      P0 = disp_dot[tmp/100%10];
 109   2                      P2 = 0xef;
 110   2                      delay_18B20(1000);
 111   2                      P2 = 0xff;
 112   2                      P0 = disp[tmp/1000%10];
 113   2                      P2 = 0xdf;
 114   2                      delay_18B20(1000);
 115   2              }
 116   1      }

C51 COMPILER V8.02   TEMPERATURE                                                           11/01/2006 20:56:43 PAGE 3   


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    331    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =     22       3
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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