RE: Detecting DFU upgrade

David Meiklejohn — Mon, 21 Sep 2020 23:48:11 GMT

Thanks Hung, that's an excellent idea.

RE: Detecting DFU upgrade

Hung Bui — Mon, 21 Sep 2020 13:52:49 GMT

Hi David,

Option 1 and 2 would requires you run a relatively time consuming check every time you boot your application.
Option 3 may have an issue if you have a power reset before you enter the main application.

I would think of writing to the start address of bank 1 a magic word, 0xFEEDC0DE for example. When your application booting up, it will check for this magic word at the first address of the first page of bank 1. If it's 0xFFFFFFFF or something else not 0xFEEDC0DE , the application knows that it should reinitialize the log. It should then erase the first page in bank 1 and re-write the magic word back and continue to reinitialize the log database.

This should work in both case successful and unsuccessful DFU update. And it works even in case that there was a power failure when switching from bootloader to application. And you don't need to modify the bootloader.