adc_m127.lst

时间触发嵌入式系统设计模式:使用8051系列微控制器开发可靠应用

C51 COMPILER V6.10  ADC_M127                                                               04/19/2001 10:36:44 PAGE 1   


C51 COMPILER V6.10, COMPILATION OF MODULE ADC_M127
OBJECT MODULE PLACED IN .\ADC_m127.OBJ
COMPILER INVOKED BY: C:\KEIL\C51\BIN\C51.EXE .\ADC_m127.c BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          /*------------------------------------------------------------------*-
   2          
   3             ADC_m127.C (v1.00)
   4          
   5            ------------------------------------------------------------------
   6          
   7             Code library for Max127 (I2C) ADC.
   8          
   9          
  10             COPYRIGHT
  11             ---------
  12          
  13             This code is from the book:
  14          
  15             PATTERNS FOR TIME-TRIGGERED EMBEDDED SYSTEMS by Michael J. Pont 
  16             [Pearson Education, 2001; ISBN: 0-201-33138-1].
  17          
  18             This code is copyright (c) 2001 by Michael J. Pont.
  19           
  20             See book for copyright details and other information.
  21          
  22          -*------------------------------------------------------------------*/
  23          
  24          #include "Main.H"
  25          #include "Port.h"
  26          
  27          #include "I2C_Core.h"
  28          #include "ADC_m127.h"
  29          
  30          #include "Delay_t0.h"
  31          
  32          // ------ Public variable definitions ------------------------------
  33          
  34          // The ADC value
  35          tByte ADC_G;
  36          
  37          // ------ Public variable declarations -----------------------------
  38          
  39          // The error codes - see scheduler
  40          extern tByte Error_code_G;
  41          
  42          // ------ Private constants ----------------------------------------
  43          
  44          // Chip address = 0101xxxW
  45          #define I2C_MAX127_ADDRESS (80) 
  46          
  47          // Start bit set
  48          // Normal power mode (not in power-down mode)
  49          // Range 0 - 5V
  50          #define I2C_MAX127_MODE (0x80)
  51          
  52          
  53          // ------ Private variable definitions------------------------------
  54          
  55          // The ADC channel (0 - 7)
C51 COMPILER V6.10  ADC_M127                                                               04/19/2001 10:36:44 PAGE 2   

  56          // *** Value here is required channel value << 4 ***
  57          // *** We are using Channel 2 ***
  58          static tByte I2C_MAX127_Channel_G = 0x20;
  59          
  60          
  61          /*------------------------------------------------------------------*-
  62          
  63            I2C_ADC_Max127_Read()
  64          
  65            Reads from the I2C 12-bit ADC
  66          
  67            The channel used is given by ADC_Channel_G
  68          
  69            This version reads only 8-bits (most sig) data
  70          
  71          -*-------------------------------------------------------------------*/
  72          void I2C_ADC_Max127_Read(void)
  73             {
  74   1         I2C_Send_Start(); // Generate I2C START condition
  75   1         
  76   1         // Send DAC device address (with write access request)
  77   1         if (I2C_Write_Byte(I2C_MAX127_ADDRESS | I2C_WRITE))    
  78   1            {
  79   2            Error_code_G = ERROR_I2C_ADC_MAX127;
  80   2            return;
  81   2            }
  82   1         
  83   1         // Set the ADC mode and channel - see above
  84   1         if (I2C_Write_Byte(I2C_MAX127_MODE | I2C_MAX127_Channel_G)) 
  85   1            {
  86   2            Error_code_G = ERROR_I2C_ADC_MAX127;
  87   2            return;
  88   2            }
  89   1         
  90   1         I2C_Send_Stop(); // Generate STOP condition
  91   1      
  92   1         I2C_Send_Start(); // Generate START condition (again)
  93   1             
  94   1         // Send Max127 device address (with READ access request)
  95   1         if (I2C_Write_Byte(I2C_MAX127_ADDRESS | I2C_READ))  
  96   1            {
  97   2            Error_code_G = ERROR_I2C_ADC_MAX127;
  98   2            return;
  99   2            }
 100   1         
 101   1         // Receive first (MS) byte from I2C bus
 102   1         ADC_G = I2C_Read_Byte();
 103   1         
 104   1         I2C_Send_Master_Ack(); // Perform a MASTER ACK
 105   1         
 106   1         // Here we require temperature only accurate to 1 degree C
 107   1         // - we discard LS byte (perform a dummy read)
 108   1         I2C_Read_Byte();
 109   1         
 110   1         I2C_Send_Master_NAck(); // Perform a MASTER NACK
 111   1         
 112   1         I2C_Send_Stop(); // Generate STOP condition
 113   1         }
 114          
 115          /*------------------------------------------------------------------*-
 116          ---- END OF FILE -------------------------------------------------
 117          -*------------------------------------------------------------------*/
C51 COMPILER V6.10  ADC_M127                                                               04/19/2001 10:36:44 PAGE 3   



MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     66    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =      2    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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