RAM retention of Softdevice RAM region

[Pascal Künzi]

Hi there

I am currently trying to retain the RAM that is being used by the Softdevice. More precisely the attribute table so that its content does not need to be set after every wakeup from system OFF.

Outside of the Softdevice RAM region I can successfully retain Values.

I use the nRF52832 with the SD132 v6.1.0.

So my main question is, if it is even possible to retain the Softdevice RAM through system OFF?

If so, how can I achieve that?

Thank you in advance!

Best regards,
Pascal

[Andy]

What's wrong with setting the contents on wake up?

[Simonr]

Hi Pascal

Retaining the SoftDevice RAM region is pointless, as the SoftDevice will reinitialize after system OFF regardless, as it is considered a RESET when awoken, which means NVIC/RTC/TIMER etc. will have to be reinitialized as well, even if you retain full RAM. So it will not be possible to accomplish what you want here.

This case has an example on how to implement RAM retention.

Best regards,

Simon

[Pascal Künzi]

Hi Simon

Thanks for your quick reply. I already thought that the Softdevice initializes its own RAM region but I couldn't find any information on that.

I will just use the system ON mode instead then.

The current consumption is gonna be a little higher, but it will work.

Best regards,

Pascal