How can I read RESETREAS register using a softdevice?

[ndarkness]

Hello,

I would like to know how I can identify the reason for a reset in my device, I have read about the register NRF_POWER->RESETREAS but I don't know how to check it since I am using a softdevice.

I have read as well this post but I couldn't capture the reset reason with it, thus I am turning to the NRF_POWER->RESETREAS register.

Any hints?

Thanks in advance

[endnode]

Simply read that register right after your FW boots way before you enable SD. No conflict at that time, you can freely read the value (I actually believe you can read it like that even when SD is active but it doesn't matter).

[endnode]

Yes, setting some GPIO as input will make that PIN waking up the MCU from SYSTEM OFF. Here is example from SDK:

// This pin is used for waking up from System OFF and is active low, enabling sense capabilities.
nrf_gpio_cfg_sense_input(PIN_GPIO_WAKEUP, BUTTON_PULL, NRF_GPIO_PIN_SENSE_LOW);

// Workaround for PAN_028 rev1.1 anomaly 22 - System: Issues with disable System OFF mechanism
nrf_delay_ms(1);