one firmware in two different pic

Fabri · Joined: 22 Aug 2005 Posts: 275

Hi to all,

I have one firmware to load with bootloader in PIC18F4525 and PIC18F46K22. Configuration bit are already programmed based on PIC used. Is there possibility to check PIC by firmware and change some configuration by firmware ?

Thanks and Regards,
Fabri

FvM · Joined: 27 Aug 2008 Posts: 2337 Location: Germany

Yes, the bootloader can manipulate the configuration data.

Ttelmah · Joined: 11 Mar 2010 Posts: 19513

However, consider just having the bootloader _not_ use the configuration data at all.
Remember that most changes here will stop the bootloader from working. Anything that affects the clock rate, protection etc. etc..
Have it just ignore any data in this range.

Best Wishes

Fabri · Joined: 22 Aug 2005 Posts: 275

Thanks for reply,
I'm not interest to manipulate configuration because already programmed. Anyway I need my runtime firmware can configure some option based on pic used. Can I detect, by firmware, PIC code set different option ?

Thanks,
Fabrizio

FvM · Joined: 27 Aug 2008 Posts: 2337 Location: Germany

It's in fact better not to write to configuration bits. Your post has been unclear in this point.

You can however readout the DEVID words and make your firmware act specifically on it.

Fabri · Joined: 22 Aug 2005 Posts: 275

As I told I don't want write configuration bits.

I'll read device ID as you suggest.

Regards,
Fabrizio