RE: NRF9160 while (L)DETECT is high will not cause an immediate wakeup when entering System OFF

Håkon Alseth — Thu, 05 Oct 2023 12:50:00 GMT

Hi,

[quote user=""]

During debugging we noticed that the following sentence from the NRF9160 documentation does not hold:

> Setting the system to System OFF while DETECT is high will cause a wakeup from System OFF reset.

[/quote]

Running the zephyr/samples/boards/nrf/system_off sample, I saw the same behavior as you, which contradicts the above statement in the PS.

However, I dug a bit deeper into what was happening behind the scenes, and CONFIG_GPIO=y enables this IRQ handler:

Which effectively clears the EVENTS_PORT each time the DETECT signal is active.

Disabling GPIO will make the behavior equal to what is described in the PS:

CONFIG_GPIO=n

Could you try this and see if you see the same behavior?

For your convenience:

Kind regards,

Håkon

NRF9160 while (L)DETECT is high will *not* cause an immediate wakeup when entering System OFF