nRF5340 Low Power Mode

[krisnaresi89]

Hi there,

I have project that require low power mode using nRF5340. I found a very comprehensive thread here related to low power for nRF5340.

FYI, right now I use Zephyr v3.6.0. When I compile my source code, I start to realize CONFIG_PM cannot be set because it depends on HAS_PM, and surprisingly nRF3240 doesn't have that. I think the thread above is using Zephyr v3.4.0 or below because at that version, CONFIG_PM doesn't have HAS_PM dependency.

Now, I want to implement custom idle thread hook using pm_state_set and pm_state_exit_post_ops, unfortunately I cannot do that because CONFIG_PM cannot be set. Is there anything we can do other that rollback to 3.4.0 and still stay on 3.6.0? Thank you for your time and assistance.

[jakubtopic]

Hi @krisnaresi89,

afaik Nordic does not currently implement the System Power Management on its platforms. There is only Device Power Management subsystem available for peripheral devices.

Nordic SoCs have automatic power management when running idle (ie. k_cpu_idle()) and there is one extra state – System OFF – that can be entered by calling sys_poweroff().

[krisnaresi89]

Hi @jakubtopic,

Thank you for your answer. Your explanation is clear so I mark it as answer. Thanks.

[e-deck]

So much head scratching. Good to know it's just not supported and I'm not crazy.