RAM state after reset by WatchDog

RE: RAM state after reset by WatchDog

Heidi — Fri, 17 Apr 2020 12:15:49 GMT

Hi, you could write to FLASH instead.

I would recommend using the Flash Data Storage library in the SDK (instead of the Flash Storage library) if you're updating after every boot. Flash has an endurance of 10000 write/erase cycles. With FDS you can fill up a whole page before having to erase, so you get basic wear leveling.

There is also an FDS example available in the SDK.

Best regards,

Heidi

RE: RAM state after reset by WatchDog

AKYR — Wed, 15 Apr 2020 08:23:09 GMT

Hey Heidi,

Thanks for this, I didn't saw you answered !

So for the product we are designing the most probable cause of a reboot is the Watchdog, but we would like to save a few data for the next boot...

This is the only solution I see, RAM struct in .non_init section with a CRC calculation to ensure data is not corrupted, can you think of any other way to pass data to next boot after Watchdog reboot ?

Thanks in advance !

Aloïs KYROU.

RE: RAM state after reset by WatchDog

Heidi — Mon, 30 Mar 2020 19:13:40 GMT

Hi!

It looks like you got lucky. The documentation states that the RAM may be corrupted, but that doesn't mean it will happen every time. So the data is not reliable after a WD reset.

Best regards,

Heidi