General purpose retention register NRf52

[Riaan]

I need to read (and clear) the general purpose retention register. I cant start the Soft Device just yet, so cant use the sd_power_gpregret_get and sd_power_gpregret_clr functions just yet.

I thought these were just registers that I can write to or read from, but the values don't seem to match up.

x = NRF_POWER->GPREGRET2

and NRF_POWER->GPREGRET2 = 0;

I need to run this almost as the first thing in the application. Any ideas of what I am doing wrong?

[Kenneth]

Have in mind that GPREGRET and GPREGRET2 both can retain 8-bit (not 32-bit).

Kenneth

[Riaan]

Well, the first part should still work.

I see that for some reason I also get hard faults if I read it too early.

Are there any specific things I got to enable to use it in such fashion?

[Kenneth]

This should be straight forward yes, the only thing I can think of is:

https://devzone.nordicsemi.com/f/nordic-q-a/24766/general-purpose-registers/97533#97533