How do I get the reset cause with nRF Connect SDK?

RE: How do I get the reset cause with nRF Connect SDK?

MaLu — Tue, 22 Feb 2022 12:03:24 GMT

Thank you very much for researching this, it is much appreciated!

RE: How do I get the reset cause with nRF Connect SDK?

Hakon — Tue, 22 Feb 2022 11:49:44 GMT

The hwinfo driver you are referring to is most likely outdated, as it is reading the register from the secure domain. The driver does not have a non-secure implementation as far as I can tell.

It calls nrf_power_resetreas_get() with the argument NRF_POWER instead of NRF_POWER_NS;

nrf_power_resetreas_get(NRF_POWER);

If you want something "hardware-agnostic", my suggestion is you register a feature request in the Zephyr project.

RE: How do I get the reset cause with nRF Connect SDK?

MaLu — Mon, 14 Feb 2022 13:32:40 GMT

Thank you.

This is already much better, than just reading out the register.
I am sorry, that I'm not explaining myself very well.
When I say Zephyr-ish approach, I mean, that I want to be as Hardware-agnostic in my code as possible. With nrf_power_resetreas_get(NRF_POWER_NS) and espeacially with just reading from the register, I am dependent on the Hardware. So far I have managed to only use very high level functions with my code and was hoping to also be able to do this for the reset cause. That's why I was hoping to make hwinfo_get_reset_cause() work, since it is not nrf specific and would only use the underlying nrf driver.
I have noticed, that there is hwinfo_nrf stuff (hwinfo_nrf.c), but I cannot figure out, how to get the hwinfo wrapper to use that driver in my constellation.

RE: How do I get the reset cause with nRF Connect SDK?

Hakon — Mon, 14 Feb 2022 12:51:50 GMT

[quote user="hiasiboy"]I've read that as well, but was hoping for a more Zephyr-ish approach.[/quote]

I'm not sure what you mean by this, but if you don't want to read the register directly you can use the nrf power library function

nrf_power_resetreas_get(NRF_POWER_NS);

RE: How do I get the reset cause with nRF Connect SDK?

MaLu — Mon, 14 Feb 2022 12:34:28 GMT

Hi,
I've read that as well, but was hoping for a more Zephyr-ish approach.

RE: How do I get the reset cause with nRF Connect SDK?

Hakon — Mon, 14 Feb 2022 12:32:31 GMT

Hello,

I believe you can read out the value of the RESETREAS register to get the reset reason.