sleep mode of nRF52840 in NCS

RE: sleep mode of nRF52840 in NCS

peter_liu — Tue, 26 Oct 2021 02:34:40 GMT

thanks, it's very helpful.

RE: sleep mode of nRF52840 in NCS

Simonr — Mon, 25 Oct 2021 13:13:42 GMT

Please check out the nRF5x system OFF sample project in Zephyr which uses pm_power_state_force correctly to force an nRF5x device to system OFF. It can be found in ...\<NCS_FOLDER>\v1.7.0\zephyr\samples\boards\nrf\system_off\src\main.c

Best regards,

Simon

RE: sleep mode of nRF52840 in NCS

peter_liu — Mon, 25 Oct 2021 11:09:37 GMT

actually, I just wanted to force it to sleep mode for some HW test for now.

so, is the following correct way ?

info.state=PM_STATE_RUNTIME_IDLE;
pm_power_state_force( info);

RE: sleep mode of nRF52840 in NCS

Simonr — Mon, 25 Oct 2021 06:59:47 GMT

Please check out the Power Management subsystem in the Zephyr RTOS which is what the nRFConnect SDK (NCS) applications use for power management. The list of available power states is defined by pm_state. The recommended way to go to sleep is neither of these, as the PM_STATE_STANDBY or PM_STATE_RUNTIME_IDLE are better suited to put devices into sleep modes, instead of "forcing" them to sleep modes.

Best regards,

Simon