sd_power_reset_reason_get not functioning as expected

[Gert]

I am developing on a nrf52 board and trying to use sd_power_reset_reason_get(&uint32). This function should only be able to return succes, but I always get back 1.  I saw a question on this forum about this behaviour, but that was dated 4 years ago. When it doesn't return 1 I don't trust the  reset reason to be correct.

Does anyone know how to handle this correctly?

[Vidar Berg]

Hi, 

Did you call sd_power_reset_reason_get() after softdevice enable? The softdevice must be enabled prior to any sd_* API calls (i.e., there are a couple of exceptions for API that controls IRQ forwarding). 

Note that you can access the POWER register directly prior to softdevice enable.

[Gert]

Hello Vidar,

This seems to work. I have to detect when the board is starting from power off. When I test this the reset reason is 0. Can I assume that when it is 0 that it always started from power off state?

[Vidar Berg]

Hello,

Yes, RESETREAS register is cleared through BOR and POR (reset behavior).