bare-metal program to enter low-power IDLE

RE: bare-metal program to enter low-power IDLE

bios-bob — Wed, 02 Apr 2025 00:56:12 GMT

looking back at my original example, GLITCHDET is enabled by default.... once i disabled GLITCHDET, my power numbers were right where i expected....

i'm good to go now....

RE: bare-metal program to enter low-power IDLE

Sigurd — Tue, 01 Apr 2025 21:59:23 GMT

Hi!

The idle thread will put the CPU in idle mode, https://docs.nordicsemi.com/bundle/ncs-2.9.1/page/zephyr/kernel/services/threads/system_threads.html , so you could actually have a empty main.

Try setting

CONFIG_SERIAL=n

in your prj.conf file, and see if that lowers the current consumption

RE: bare-metal program to enter low-power IDLE

bios-bob — Tue, 01 Apr 2025 16:36:29 GMT

i'm using a joulescope js220 power analyzer for my measurements.... my nordic PPK-2 should arrive soon, which i'll use as well....

my target board is the DK.... my test program is <200 bytes.... once it reaches main(), it does what the issue above noted....

to make things even simpler, ALL i did was call __WFI().... i didn't even configure a GPIO....

this is essentially a HW question.... after the chip comes out of reset, what's the minimal amount of code required to enter IDLE (with current consumption in the 1-5 uA range)....

RE: bare-metal program to enter low-power IDLE

Sigurd — Tue, 01 Apr 2025 16:26:52 GMT

[quote user="bios-bob"]show me how to modify the system_off sample so that it enters the lowest power IDLE mode instead.... [/quote]

It should do that out-of-the box. https://github.com/nrfconnect/sdk-zephyr/tree/main/samples/boards/nordic/system_off

What do you measure with that sample?

Also, are you using a DK or your own custom board?

RE: bare-metal program to enter low-power IDLE

bios-bob — Mon, 31 Mar 2025 13:58:33 GMT

as an alternative, show me how to modify the system_off sample so that it enters the lowest power IDLE mode instead....

RE: bare-metal program to enter low-power IDLE

bios-bob — Fri, 28 Mar 2025 01:43:14 GMT

sorry for the sloppy input.... lines 1,2,4 should end with 1 << 14