writing to onboard eeprom from outside main program

ghostman11

Well-Known Member

• Nov 8, 2011

• #1

hi chaps,
i am aware of how to read and write to the pic onboard eeprom. but is there a way to write say a serial number or dataset to an eeprom at the time of flashing the chip with the program? if so how is this done?

 

Ian Rogers

User Extraordinaire

Forum Supporter

Most Helpful Member

• Nov 8, 2011

• #2

With pickit2 you can (with the stand alone program) write any value to the eeprom... With MPLAB ide I use the MCH scripts to pre-load the eeprom values... What program do you use?

 

Last edited: Nov 8, 2011

Nigel Goodwin

Super Moderator

Most Helpful Member

• Nov 8, 2011

• #3

The original question is a bit vague, but you can simply preset the EEPROM values in your source code.

 

L

Lourens

Member

• Nov 8, 2011

• #4

The following is a section of source code to preset the onboard EEPROM for a 16F876, should work for most.
;################ Initialize PIC EEPROM Data Memory################
ORG H'2100' ; INIT EEPROM Data
DE LOW D'600' ; Setpoint Init value of 20DegC (K Units) EEADDRESS 0x00
DE HIGH D'600' ; EEADDRESS 0x01
DE LOW D'600' ; Alarm Init value of 20DegC (K Units) EEADDRESS 0x02
DE HIGH D'600' ; EEADDRESS 0x03

 

ghostman11

Well-Known Member

• Nov 8, 2011

• #5

hi
sorry for the vagueness i couldnt think how to word it without making a hash of it.
i use PK2 software and mplab, i wanted to avoide writing it in the source code. i didnt know you could just write to eeprom from PK2 standalone software so i will have a play with that. all i am after is a unique serial number and a address wich is also unique

 

ghostman11

Well-Known Member

• Nov 8, 2011

• #6

i did also come up with a over complicated fancy way of doing it. but isnt realy needed and is overcomplicated. i had thought i know get another pic that keeps all the unique codes then when i add another program that chips eeprom via usart with a code checked against those already used etc etc. then i sat down had a cup of tea and thought ...........NAHHHHHHHHhhhhhh keep it simple

 

3v0

Coop Build Coordinator

Forum Supporter

• Nov 8, 2011

• #7

Either or both MPLAB and PK2 allow you to choose which memory types you want to write.

If you want to do serial numbers just edit the EEPROM in the IDE prior to flashing.

 

ghostman11

Well-Known Member

• Nov 8, 2011

• #8

ah ok 3v0. i see what you mean. thats great nice and simple