Difference between revisions of "Zephyr ncs sleep modes"

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2022-02-16 WED -
 
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Inquiring at CircuitDojo about where to find low power, sleep and deep sleep mode settings, APIs for these in nRF9160 based designs:
 
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*  https://community.jaredwolff.com/d/222-nrf9160-sleep-and-low-power-control-areas
 
*  https://community.jaredwolff.com/d/222-nrf9160-sleep-and-low-power-control-areas
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In first reply a recommendation to review `nfed` sample application named 'active_sleep':
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*  https://github.com/circuitdojo/nrf9160-feather-examples-and-drivers/blob/v1.7.x/samples/active_sleep/child_image/spm.conf
 
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Revision as of 20:37, 17 February 2022

Zephyr and Nordic ncs Sleep Modes 2022-01-15 Tuesday



Some posts and links to follow:


Looking now more closely at nRF9160 System in Package (SiP):

Oh and a note on nRF9160 watchdog timer:

This looks important:


^ nRF9160 Sleep Mode Forum Posts

nRF9160 sleep mode not working in SDK 'nrf' v1.6.1, works in 1.7.0 . . .

Symbol 'PSM' may be a more apt symbol for which to search, also looks like power savings modes may only be practical with certain network providers:

2022-02-16 WED - Inquiring at CircuitDojo about where to find low power, sleep and deep sleep mode settings, APIs for these in nRF9160 based designs:

In first reply a recommendation to review `nfed` sample application named 'active_sleep':


^ nRF9160 Power Saving Mode(s) Examples

Power Savings Mode Ten Minutes Period Example

Excerpts from this post:

    "In order to achieve the lowest possible current consumption, logging has to be turned off. This is done by,

    Adding the CONFIG_SERIAL=n flag to the prj.conf file in the project folder.
    Adding the CONFIG_SERIAL=n to the SPM prj.conf file. This is located in the SDK_ROOT/nrf/samples/nrf9160/spm folder."


An example from Jared Wolff of CircuitDojo, see line 135 in main.c:

Zephyr Project documentation regarding `k_cpu_idle()`:


^ Terms

There are a lot of terms and acronyms associated with LTE modem and Nordic Semi SoC and SiP parts. Here we capture a few of those in our quest for low power modes understanding.


^ Pattern Searches in Zephyr and NRF Repositories

Some searches whose results to further explore . . .

ted@localhost:~/projects/zephyr-based/zephyr$ grep -nr sleeping ./*
./arch/arm/core/aarch32/cpu_idle.S:125:	 * Lock PRIMASK while sleeping: wfe will still get interrupted by
./arch/arm/core/aarch32/nmi_on_reset.S:12: * is to hard hang, sleeping.
./boards/posix/native_posix/doc/index.rst:56:simulated CPU is sleeping.
./doc/guides/porting/arch.rst:226:yielding/sleeping primitives.