(NCS ZEPHYR) The nRF52840 cannot wake up from deep sleep.

[Mr.tang]

Using the nRF52840 with NCS v2.6.1, I want to put the device into a low-power sleep state during idle time. Before sleeping, I configured a GPIO interrupt as the wake-up source, and then I call sys_poweroff(); to enter deep sleep mode. The issue I'm facing is that while the device can enter deep sleep, it cannot wake up from it; I can only reset the device to regain functionality.

[Håkon Alseth]

Hi,

 

Have you tried the zephyr/samples/boards/nrf/system_off sample to see if that works as expected?

To configure a wake-up source, it should be defined as a _LOW or _HIGH level, like done here:

https://github.com/nrfconnect/sdk-zephyr/blob/v3.5.99-ncs1/samples/boards/nrf/system_off/src/main.c#L55

 

If it is set as edge-triggered, it will default to using GPIOTE IN channel, which is not active in system off.

 

Kind regards,

Håkon

[Mr.tang]

Thank you very much for your reply; it is indeed as you said regarding this issue.

[Håkon Alseth]

Glad to hear that this solved your issue. Hope you have a wonderful day!

 

Kind regards,

Håkon

[Mr.tang]

Hello! I apologize for the interruption again. According to the NRF52840 manual, the DETECT signal generated by the GPIO can be used to wake up the device (1. The DETECT signal, optionally generated by the GPIO peripheral. 2. PORT is an event that can be generated from multiple input pins using the GPIO DETECT signal). Could you please advise if Zephyr supports waking the device with the DETECT signal?

[Håkon Alseth]

Hi,

 

The DETECT signal is what is triggered by a PORT event. When you configure a gpio with _LOW or _HIGH wake up source, you are effectively setting the SENSE field in this register:

https://docs.nordicsemi.com/bundle/ps_nrf52840/page/gpio.html#ariaid-title13

Which again will trigger the DETECT signal if a SENSE configured GPIO is active:

https://docs.nordicsemi.com/bundle/ps_nrf52840/page/gpiote.html#ariaid-title3

 

Kind regards,

Håkon

[Mr.tang]

Thank you very much for your answer. Wishing you a happy life!

[Håkon Alseth]

Hi,

 

The pleasure is all mine.

Mr.tang said:

Wishing you a happy life!

Thank you so much, and the same to you!

 

If you run into any issues or have any questions, feel free to ask!

 

Kind regards,

Håkon