1820.lst

DS1820单芯数字温度传感器的基于805X单片机的C程序

C51 COMPILER V7.01  1820                                                                   10/29/2004 10:34:39 PAGE 1   


C51 COMPILER V7.01, COMPILATION OF MODULE 1820
OBJECT MODULE PLACED IN 1820.OBJ
COMPILER INVOKED BY: C:\KEIL\C51\BIN\C51.EXE 1820.c BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          //DS1820 C51 子程序
   2          //这里以11.0592M晶体为例，不同的晶体速度可能需要调整延时的时间
   3          sbit DQ =P2^1;//根据实际情况定义端口
*** ERROR C202 IN LINE 3 OF 1820.C: 'P2': undefined identifier
   4          
   5          typedef unsigned char byte;
   6          typedef unsigned int  word;
   7          
   8          //延时
   9          void delay(word useconds)
  10          {
  11   1        for(;useconds>0;useconds--);
  12   1      }
  13          
  14          //复位
  15          byte ow_reset(void)
  16          {
  17   1        byte presence;
  18   1        DQ = 0; //pull DQ line low
*** ERROR C202 IN LINE 18 OF 1820.C: 'DQ': undefined identifier
  19   1        delay(29); // leave it low for 480us
  20   1        DQ = 1; // allow line to return high
*** ERROR C202 IN LINE 20 OF 1820.C: 'DQ': undefined identifier
  21   1        delay(3); // wait for presence
  22   1        presence = DQ; // get presence signal
*** ERROR C202 IN LINE 22 OF 1820.C: 'DQ': undefined identifier
  23   1        delay(25); // wait for end of timeslot
  24   1        return(presence); // presence signal returned
  25   1      }     // 0=presence, 1 = no part
  26          
  27          //从 1-wire 总线上读取一个字节
  28          byte read_byte(void)
  29          {
  30   1        byte i;
  31   1        byte value = 0;
  32   1        for (i=8;i>0;i--)
  33   1        {
  34   2          value>>=1;
  35   2          DQ = 0; // pull DQ low to start timeslot
*** ERROR C202 IN LINE 35 OF 1820.C: 'DQ': undefined identifier
  36   2          DQ = 1; // then return high
*** ERROR C202 IN LINE 36 OF 1820.C: 'DQ': undefined identifier
  37   2          delay(1);  //for (i=0; i<3; i++); 
  38   2          if(DQ)value|=0x80;
*** ERROR C202 IN LINE 38 OF 1820.C: 'DQ': undefined identifier
  39   2          delay(6); // wait for rest of timeslot
  40   2        }
  41   1        return(value);
  42   1      }
  43          
  44          //向 1-WIRE 总线上写一个字节
  45          void write_byte(char val)
  46          {
  47   1        byte i;
  48   1        for (i=8; i>0; i--) // writes byte, one bit at a time
C51 COMPILER V7.01  1820                                                                   10/29/2004 10:34:39 PAGE 2   

  49   1        {
  50   2          DQ = 0; // pull DQ low to start timeslot
*** ERROR C202 IN LINE 50 OF 1820.C: 'DQ': undefined identifier
  51   2          DQ = val&0x01;
*** ERROR C202 IN LINE 51 OF 1820.C: 'DQ': undefined identifier
  52   2          delay(5); // hold value for remainder of timeslot
  53   2          DQ = 1;
*** ERROR C202 IN LINE 53 OF 1820.C: 'DQ': undefined identifier
  54   2          val=val/2;
  55   2        }
  56   1        delay(5);
  57   1      }
  58          
  59          //读取温度
  60          char Read_Temperature(void)
  61          {
  62   1        union{
  63   1          byte c[2];
  64   1          int x;
  65   1        }temp;
  66   1      
  67   1        ow_reset();
  68   1        write_byte(0xCC); // Skip ROM
  69   1        write_byte(0xBE); // Read Scratch Pad
  70   1        temp.c[1]=read_byte();
  71   1        temp.c[0]=read_byte();
  72   1        ow_reset();
  73   1        write_byte(0xCC); //Skip ROM
  74   1        write_byte(0x44); // Start Conversion
  75   1        return temp.x/2;
  76   1      }

C51 COMPILATION COMPLETE.  0 WARNING(S),  10 ERROR(S)