investigate persistent memory: eeprom emulation, backup registers, RTC #35
Description
having some kind of memory that persists between boots (when no power) could be quite useful.
Use cases include:
- logger would like to have a unique identifier upon each bootup for file naming. this is also generally useful for debugging logs to be able to confirm the order they happened
- important: in case the board hardfaults or hits some other unrecoverable state, a lastditch effort could be to write some important data to persistent memory so we can debug what happened even after the board loses power
things we should find out:
- how much data can be stored
- how would this be incorporated into the project? stm32 hal? external library? how complicated is it
- for preserving state during hardfaults: is the persistent memory simple enough to be used in a last-ditch effort if the board is hardfaulted in some unknown way?