tx-1bds18b20.lst

很实用的单片机例程

C51 COMPILER V6.12  TX_1BDS18B20                                                           12/01/2006 19:30:57 PAGE 1   


C51 COMPILER V6.12, COMPILATION OF MODULE TX_1BDS18B20
OBJECT MODULE PLACED IN C:\DOCUME~1\LD9149~1.XC-\桌面\51\手册程序\八BA6B~1.DS1\TX-1BDS18B20.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE C:\DOCUME~1\LD9149~1.XC-\桌面\51\手册程序\八BA6B~1.DS1\TX-1BDS18B20.C DB SB
                    - OE

stmt level    source

   1          //安装目录下的EXE文件打开后可在电脑上显示当前温度值
   2          #include <reg52.h>
   3          #define uchar unsigned char
   4          #define uint unsigned int
   5          sbit DS=P2^2;           //define interface
   6          uint temp;             // variable of temperature
   7          uchar flag1;            // sign of the result positive or negative
   8          sbit dula=P2^6;
   9          sbit wela=P2^7;
  10          unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
  11                                  0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
  12          unsigned char code table1[]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,
  13                                  0x87,0xff,0xef};
  14          
  15          void delay(uint count)      //delay
  16          {
  17   1        uint i;
  18   1        while(count)
  19   1        {
  20   2          i=200;
  21   2          while(i>0)
  22   2          i--;
  23   2          count--;
  24   2        }
  25   1      }
  26          ///////功能:串口初始化,波特率9600，方式1///////
  27          void Init_Com(void)
  28          {
  29   1           TMOD = 0x20;
  30   1           PCON = 0x00;
  31   1           SCON = 0x50;
  32   1           TH1 = 0xFd;
  33   1           TL1 = 0xFd;
  34   1           TR1 = 1;
  35   1      }
  36          
  37          void dsreset(void)       //send reset and initialization command
  38          {
  39   1        uint i;
  40   1        DS=0;
  41   1        i=103;
  42   1        while(i>0)i--;
  43   1        DS=1;
  44   1        i=4;
  45   1        while(i>0)i--;
  46   1      }
  47          
  48          bit tmpreadbit(void)       //read a bit
  49          {
  50   1         uint i;
  51   1         bit dat;
  52   1         DS=0;i++;          //i++ for delay
  53   1         DS=1;i++;i++;
  54   1         dat=DS;
C51 COMPILER V6.12  TX_1BDS18B20                                                           12/01/2006 19:30:57 PAGE 2   

  55   1         i=8;while(i>0)i--;
  56   1         return (dat);
  57   1      }
  58          
  59          uchar tmpread(void)   //read a byte date
  60          {
  61   1        uchar i,j,dat;
  62   1        dat=0;
  63   1        for(i=1;i<=8;i++)
  64   1        {
  65   2          j=tmpreadbit();
  66   2          dat=(j<<7)|(dat>>1);   //读出的数据最低位在最前面，这样刚好一个字节在DAT里
  67   2        }
  68   1        return(dat);
  69   1      }
  70          
  71          void tmpwritebyte(uchar dat)   //write a byte to ds18b20
  72          {
  73   1        uint i;
  74   1        uchar j;
  75   1        bit testb;
  76   1        for(j=1;j<=8;j++)
  77   1        {
  78   2          testb=dat&0x01;
  79   2          dat=dat>>1;
  80   2          if(testb)     //write 1
  81   2          {
  82   3            DS=0;
  83   3            i++;i++;
  84   3            DS=1;
  85   3            i=8;while(i>0)i--;
  86   3          }
  87   2          else
  88   2          {
  89   3            DS=0;       //write 0
  90   3            i=8;while(i>0)i--;
  91   3            DS=1;
  92   3            i++;i++;
  93   3          }
  94   2      
  95   2        }
  96   1      }
  97          
  98          void tmpchange(void)  //DS18B20 begin change
  99          {
 100   1        dsreset();
 101   1        delay(1);
 102   1        tmpwritebyte(0xcc);  // address all drivers on bus
 103   1        tmpwritebyte(0x44);  //  initiates a single temperature conversion
 104   1      }
 105          
 106          uint tmp()               //get the temperature
 107          {
 108   1        float tt;
 109   1        uchar a,b;
 110   1        dsreset();
 111   1        delay(1);
 112   1        tmpwritebyte(0xcc);
 113   1        tmpwritebyte(0xbe);
 114   1        a=tmpread();
 115   1        b=tmpread();
 116   1        temp=b;
C51 COMPILER V6.12  TX_1BDS18B20                                                           12/01/2006 19:30:57 PAGE 3   

 117   1        temp<<=8;             //two byte  compose a int variable
 118   1        temp=temp|a;
 119   1        tt=temp*0.0625;
 120   1        temp=tt*10+0.5;
 121   1        return temp;
 122   1      }
 123          
 124          void readrom()          //read the serial
 125          {
 126   1        uchar sn1,sn2;
 127   1        dsreset();
 128   1        delay(1);
 129   1        tmpwritebyte(0x33);
 130   1        sn1=tmpread();
 131   1        sn2=tmpread();
 132   1      }
 133          
 134          
 135          void delay10ms()            //delay
 136            {
 137   1          uchar a,b;
 138   1          for(a=10;a>0;a--)
 139   1            for(b=60;b>0;b--);
 140   1         }
 141          
 142          void display(uint temp)			//显示程序
 143          {
 144   1         uchar A1,A2,A2t,A3,ser;
 145   1         ser=temp/10;
 146   1         SBUF=ser;
 147   1         A1=temp/100;
 148   1         A2t=temp%100;
 149   1         A2=A2t/10;
 150   1         A3=A2t%10;
 151   1         dula=0;
 152   1         P0=table[A1];		//显示百位
 153   1         dula=1;
 154   1         dula=0;
 155   1      
 156   1         wela=0;
 157   1         P0=0x7e;
 158   1         wela=1;
 159   1         wela=0;
 160   1         delay(1);
 161   1      
 162   1         dula=0;
 163   1         P0=table1[A2];		//显示十位
 164   1         dula=1;