programming EEPROM

rikotech8 · Joined: 10 Dec 2011 Posts: 376 Location: Sofiq,Bulgariq

Hi!
Is that possible to write into a EEPROM memory (not program flash memory) directly from a programmer
(MPLAB-PicKit3 in this case), not by running the program. I want to write certain bytes at certain location into an EEPROM along with programming the chip. If it is possible, i'd like to know how.
Thanks in advance!

ezflyr · Joined: 25 Oct 2010 Posts: 1019 Location: Tewksbury, MA

Hi,

Yes, it's possible. Look at the #ROM directive in the CCS Compiler manual.

John

Ttelmah · Joined: 11 Mar 2010 Posts: 19505

and the command:

getenv("EEPROM_ADDRESS")

will give the address needed on any chip (assuming you have a reasonably recent compiler), so you don't have to work out 'where' the EEPROM is in the programming space.

Best Wishes

rikotech8 · Joined: 10 Dec 2011 Posts: 376 Location: Sofiq,Bulgariq

Thanks for reply, and how can I read the written data into a ROM. Is that function going to work: read_program_eeprom( )?

Ttelmah · Joined: 11 Mar 2010 Posts: 19505

No.

READ_EEPROM, and WRITE_EEPROM, are the functions to talk to the data EEPROM.

read_program_eeprom, reads the code memory (hence 'program'), instead.

Best Wishes

spilz · Joined: 30 Jan 2012 Posts: 219

Hi,
I don't understand how to use getenv("EEPROM_ADDRESS") and #ROM at the same time
do they have to be in "main" or is it out the code?

thanks

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

This thread has an example of using #rom with getenv for the data eeprom:
http://www.ccsinfo.com/forum/viewtopic.php?t=43607&start=2

spilz · Joined: 30 Jan 2012 Posts: 219

thanks for your quick reply,
I try to add it :

PCM programmer · Joined: 06 Sep 2003 Posts: 21708