How to do nrf52840 system on low power mode without softdevice?

[Dimitri]

Hi, I'm using nrf52840 with openThread. I like set the MCU in system on low power mode. RTC1 is used as application timer for wake up and start transmission periodicly. For now, I run ot as SED and that works fine.

What is needed to realize low power mode without using Softdevice 140 or similar? Is there an application note or tutorial available?

Kind regards Dimitri

[bjorn-spockeli]

Hi Dimitri,

I believe you simply have to call the following instructions

// Wait for an event.
__WFE();
// Clear the internal event register.
__SEV();
__WFE();

in order to put the nRF52840 in System ON: Low Power when you're not using the S140 SoftDevice.

Best regards

Bjørn

[Dimitri]

Thanks so fare, I had not time to test it out yet. I will test it ASAP, after my holidays. If no co worker did test it until then.

[bjorn-spockeli]

Happy to help :) Let me know if you run in to any issues.