I'm running MPLAB C18. I'll see if I can answer some of this.

1. I have not yet found a way to set the configuration bits. I've tried
an ASM file that was linked in, but that did not work. I've posted stuff
here and on the Microchip web board. People on the web board suggested an
asm file. People here suggested some fixes to the asm file to eliminate
errors. If you look in the index of the C18 manual under "configuration
bits," it gives you a definition of them, but nothing else.  So, in
answer to question # 1, I don't know! Let me know if you find out how to
set the config bits from within C18.

2. Similarly, the manual on C18 only gives us a definition of eeprom.
Since the eeprom is not in the memory map, but instead is treated as a
peripheral, I'd expect there to be library functions to talk to the
eeprom. You can define the initial values for eeprom in assembly (sample
code below). I have not tried this in a C based project, though. The C18
libraries manual also includes eeprom in the glossary, but nowhere else.
There are eeprom functions in the I2C library, but these talk to external
eeprom on an I2C bus. I believe to write to internal eeprom, you'll have
to define your own functions (in C or asm). Putting a rom qualifier in
front of a type forces the constant to be in program memory instead of
RAM. It does not force it into eeprom.

3. On default values in eeprom, you MIGHT be able to link in the asm file
(like that below). I have not tried it, though. I know of no way to
define eeprom values directly in C18.

4. don't know about the object file checksum errors. I've never gotten
that on my Promate.


Harold

Sample eeprom intialization ASM below:

; -----------------------------------EEPROM
Allocation-------------------------------------------

LightMeterScaleHi equ   0
LightMeterScaleLo equ   1               ; Light meter scaling factor in eeprom
CC1seconds      equ     2               ; Store custom program curing mode 1 duration
CC2seconds      equ     3
CC3seconds      equ     4
CC4seconds      equ     5               ; Store custom program curing mode 4 duration
RunTime0        equ     0x06            ; Run time counter advanced every 256us
RunTime1        equ     0x07            ;
RunTime2        equ     0x08            ; Advanced every 234uS or hours/256
RunTime3        equ     0x09            ; Hours lo
RunTime4        equ     0x0a            ; Hours hi
LampStartCountHi equ    0x0b            ; Lamp starts hi
LampStartCountLo equ    0x0c            ; Lamp starts lo

        org     0x2100
        de      01, 00                  ; Default light meter scaling factor of 1
  ifdef xenon
        de      d'1'                    ; minimum time for custom cure 1
        de      d'1'                    ; minimum time for custom cure 2
        de      d'5'                    ; minimum time for custom cure 3
        de      d'5'                    ; minimum time for custom cure 4
  else
        de      d'3'                    ; minimum time for custom cure 1
        de      d'10'                   ; minimum time for custom cure 2
        de      d'15'                   ; minimum time for custom cure 3
        de      d'25'                   ; minimum time for custom cure 4
  endif
        de      low(-d'3600'),high(-d'3600'),0, RevCodeMonth, RevCodeDay ; Runtime
initialized at month/day of rev (reset during cal)
        de      0,0                     ; Lamp cycle count initialized at zero




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