C51 COMPILER V7.05   EEPROM                                                                03/14/2004 11:08:57 PAGE 1   


C51 COMPILER V7.05, COMPILATION OF MODULE EEPROM
OBJECT MODULE PLACED IN eeprom.OBJ
COMPILER INVOKED BY: C:\KEIL\C51\BIN\C51.EXE eeprom.c BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          //eeprom.c - code recommendation for C header file
   2          /***********************************************************************
   3          MODULE:    EEPROM
   4          VERSION:   1.00
   5          CONTAINS:  Routines for accessing the EEPROM on the Philips
   6                     P89LPC932
   7          COPYRIGHT: Embedded Systems Academy, Inc. - www.esacademy.com
   8          LICENSE:   May be freely used in commercial and non-commercial code
   9                     without royalties provided this copyright notice remains
  10                     in this file and unaltered
  11          WARNING:   IF THIS FILE IS REGENERATED BY CODE ARCHITECT ANY CHANGES
  12                     MADE WILL BE LOST. WHERE POSSIBLE USE ONLY CODE ARCHITECT
  13                     TO CHANGE THE CONTENTS OF THIS FILE
  14          GENERATED: On "Mar 14 2004" at "11:02:25" by Code Architect 2.03
  15          ***********************************************************************/
  16          
  17          // SFR description needs to be included
  18          #include<REG922.h>
  19          #include "eeprom.h"
  20          
  21          // flag that indicates if the EEPROM is busy or not
  22          static bit meeprombusy;
  23          
  24          /***********************************************************************
  25          DESC:    Initializes the EEPROM. Enables EEPROM interrupt
  26          RETURNS: Nothing
  27          CAUTION: Set EA to 1 after calling to enable all interrupts
  28          ************************************************************************/
  29          void eeprom_init
  30            (
  31            void
  32            )
  33          {
  34   1        // initially eeprom is not busy
  35   1        meeprombusy = 0;
  36   1      
  37   1        // set isr priority to 0
  38   1        IP1 &= 0x7F;
  39   1        IP0H &= 0x7F;
  40   1        // enable eeprom interrupt
  41   1        EIEE = 1;
*** ERROR C202 IN LINE 41 OF EEPROM.C: 'EIEE': undefined identifier
  42   1      }
  43          
  44          /***********************************************************************
  45          DESC:    Reads a location in the EEPROM.
  46                   If either global interrupts or the EEPROM interrupt is disabled
  47                   then the function will return when the operation is complete.
  48                   If global interrupts and the EEPROM interrupt are enabled, the
  49                   function will return immediately and an interrupt will occur
  50                   when the operation is complete.
  51          RETURNS: The 8-bit value read if interrupts are disabled, otherwise
  52                   0x00 will be returned.
  53          CAUTION: eeprom_init must be called first
  54          ************************************************************************/
C51 COMPILER V7.05   EEPROM                                                                03/14/2004 11:08:57 PAGE 2   

  55          unsigned char eeprom_read
  56            (
  57            unsigned int address     // 9-bit address to read (0x000 - 0x1FF)
  58            )
  59          {
  60   1        // wait for previous operation to complete
  61   1        while (meeprombusy);
  62   1      
  63   1        // eeprom now busy
  64   1        meeprombusy = 1;
  65   1      
  66   1        // store bit 8 of address
  67   1        // byte operation, clear interrupt flag
  68   1        DEECON = (address >> 8) & 0x01;
*** ERROR C202 IN LINE 68 OF EEPROM.C: 'DEECON': undefined identifier
  69   1        // store bits 0-7 of address
  70   1        DEEADR = address & 0xFF;
*** ERROR C202 IN LINE 70 OF EEPROM.C: 'DEEADR': undefined identifier
  71   1      
  72   1        // if not using interrupt then poll for end of operation
  73   1        if (!EA || !EIEE)
*** ERROR C202 IN LINE 73 OF EEPROM.C: 'EIEE': undefined identifier
  74   1        {
  75   2          // wait for operation to complete
  76   2          while (!(DEECON & 0x80));
*** ERROR C202 IN LINE 76 OF EEPROM.C: 'DEECON': undefined identifier
  77   2          // eeprom no longer busy
  78   2          meeprombusy = 0;
  79   2          // return value
  80   2          return DEEDAT;
*** ERROR C202 IN LINE 80 OF EEPROM.C: 'DEEDAT': undefined identifier
  81   2        }
  82   1      
  83   1        return 0x00;
  84   1      }
  85          
  86          /***********************************************************************
  87          DESC:    Writes to a location in the EEPROM.
  88                   If either global interrupts or the EEPROM interrupt is disabled
  89                   then the function will return when the operation is complete.
  90                   If global interrupts and the EEPROM interrupt are enabled, the
  91                   function will return immediately and an interrupt will occur
  92                   when the operation is complete.
  93          RETURNS: Nothing
  94          CAUTION: eeprom_init must be called first
  95          ************************************************************************/
  96          void eeprom_write
  97            (
  98            unsigned int address,    // 9-bit address to write to (0x000 - 0x1FF)
  99            unsigned char value      // value to write
 100            )
 101          {
 102   1        bit eacopy;
 103   1      
 104   1        // wait for previous operation to complete
 105   1        while (meeprombusy);
 106   1      
 107   1        // eeprom now busy
 108   1        meeprombusy = 1;
 109   1      
 110   1        // store bit 8 of address
 111   1        // byte operation, clear interrupt flag
C51 COMPILER V7.05   EEPROM                                                                03/14/2004 11:08:57 PAGE 3   

 112   1        DEECON = (address >> 8) & 0x01;
*** ERROR C202 IN LINE 112 OF EEPROM.C: 'DEECON': undefined identifier
 113   1        // disable interrupts
 114   1        eacopy = EA;
 115   1        EA = 0;
 116   1        // store value to write
 117   1        DEEDAT = value;
*** ERROR C202 IN LINE 117 OF EEPROM.C: 'DEEDAT': undefined identifier
 118   1        // store bits 0-7 of address
 119   1        DEEADR = address & 0xFF;
*** ERROR C202 IN LINE 119 OF EEPROM.C: 'DEEADR': undefined identifier
 120   1        // restore interrupts
 121   1        EA = eacopy;
 122   1      
 123   1        // if not using interrupt then poll for end of operation
 124   1        if (!EA || !EIEE)
*** ERROR C202 IN LINE 124 OF EEPROM.C: 'EIEE': undefined identifier
 125   1        {
 126   2          // wait for operation to complete
 127   2          while (!(DEECON & 0x80));
*** ERROR C202 IN LINE 127 OF EEPROM.C: 'DEECON': undefined identifier
 128   2          // eeprom no longer busy
 129   2          meeprombusy = 0;
 130   2        }
 131   1      }
 132          
 133          /***********************************************************************
 134          DESC:    Writes a value to every location in a 64-byte row in
 135                   the EEPROM.
 136                   If either global interrupts or the EEPROM interrupt is disabled
 137                   then the function will return when the operation is complete.
 138                   If global interrupts and the EEPROM interrupt are enabled, the
 139                   function will return immediately and an interrupt will occur
 140                   when the operation is complete.