EEPROM on 16F872

[andygraves]

Doing some testing with EEPROM, so made a quick prog to store a value to EEPROM and retrieve it on powerup, all works fine in the panel but on the chip the value is lost (it returns the address instead of the data. Any clues...?

FLASH.fcf

[andygraves]

Here is the FC4 file

[Benj]

Hi Andy

The EEPROM will get erased during programming by default. Could this be the cause of the problem.
Or is it also getting erased on a reset?

If you need to disable the programming EEPROM erase then information an be found on this here.
http://www.matrixmultimedia.com/mmforum ... ROM#p17227

[andygraves]

Hi Ben,
Even after a reset...
Thanks
Andy

[andygraves]

Hi Ben, Just tried it with a 16F88 and code is works ok?

[andygraves]

Hi Ben, is the a chip problem or FC problem?

[Benj]

Hi Andy

It is unlikely to be a chip problem unless you have had it for a while or it has been a bit abused in the past.

I will get one of these devices and see if I can find out whats going wrong.

[Benj]

Hello Andy

I have had a quick dig around and may have a solution to the problem.

Please can you try the following.

Open the 16F872.fcd file from the "C:\Program Files\Matrix Multimedia\Flowcode vx\FCD\" folder in a text editor and then scroll down to the [Defines] section.

At the bottom of this section add the line

Define22=#define MX_EE_TYPE2

Save the file, restart Flowcode and re-compile to your target. Hopefully the problem will now be resolved on the hardware.

let me know how you get on

[andygraves]

Hi Ben,
Yes that sorted it, thank you.
Do such fixes find their way into future versions?
Thanks
Andy

[Benj]

Hello Andy,

Yes I will make sure that this makes it into the next release.