No code produced for 'write_program_memory' for PIC18F4620.

brianj · Joined: 06 Oct 2003 Posts: 6 Location: Liverpool, UK

I'm porting a working application from an 18F452 to an 18F4620. On looking at the .lst file, no code has been produced for 'write_program_memory' - the compiler has just ignored it! There's no code protection set, so it isn't being clever and optimizing it out. Any ideas please?

Brian

ckielstra · Joined: 18 Mar 2004 Posts: 3680 Location: The Netherlands

Which compiler version are you using?
From the CCS list of Software Changes:

Guest · Posted: Sun Nov 28, 2004 9:49 am

Sorry, forgot to mention the compiler. It's 3.212 and I have all versions back to 3.208, so I'll see if it works in one of those.

Thanks.

Brian

Ttelmah · Guest

Check that 'nolist' is not turned off in the include file for the older chip, and on on the newer one.

Best Wishes

Mark · Joined: 07 Sep 2003 Posts: 2838 Location: Atlanta, GA

It doesn't appear to work for me either, however, write_program_eeprom() works just fine or at least generates some code Very Happy

Tom-H-PIC · Joined: 08 Sep 2003 Posts: 105 Location: New Castle, DE

First to use the ICD you need firmware 1.30 this is beta. I have been told that it will be in the next release of the compiler. I'm using compiler 3.212.
Two per-processor directives that I have not been able to use at this time is because compiler has trouble generating code for the 18Fx620 chips.

#ZERO_RAM // This sends the compiler to never never land output code is junk.

#device WRITE_EEPROM=ASYNC // This keeps write EEPROM from working at all.

Ok the good news is that I'm not having an issue with using
write_program_eeprom(0x200000,Rom_Total);

As you can see this address is not in the program memory proper, this is the user ID location.

The long and short of it is that write program eeprom is working for locations 0x200000 to 0x200007.

I don’t know if any of this information is helpful at all but I though I would pass on what I know about the working with the 18Fx620 chips.

Tom

brianj · Joined: 06 Oct 2003 Posts: 6 Location: Liverpool, UK

Thanks for all the suggestions. I can't get it to produce code with any of the recent versions I've tried. I've just had to write it in assembler, which is annoying. I can understand bugs in functions - but missing out a whole function altogether?

Brian

RossJ · Joined: 25 Aug 2004 Posts: 66

I get some code generated (just no where near enough)...