[NCS v2.6.1] Issue with build ("/soc/pwm@4001c000 defined without sleep state")

RE: [NCS v2.6.1] Issue with build ("/soc/pwm@4001c000 defined without sleep state")

Priyanka — Fri, 23 Aug 2024 10:50:52 GMT

Hi,

That's right, the sys_poweroff() powers down the CPU and the peripherals such that your device is in the lowest power state. It helps to save maximum energy.

NRF_POWER->SYSTEMOFF is more of a lower hardware specific way of using the sys_poweroff()and should do the same. But please note that actually it's only the CPU that is powered off, but since the CPU controls the power state of the peripherals, then the peripherals are shut down too.

Calling the sys_poweroff() is the right approach when you want minimal consumption when in battery charging state. But please make sure that the charger and other components responsible for the charging are on an independent power rail so that they are not affected by the system-off mode.

-Priyanka

RE: [NCS v2.6.1] Issue with build ("/soc/pwm@4001c000 defined without sleep state")

Robotics Gun — Wed, 21 Aug 2024 21:51:06 GMT

Appreciate!

Compile works without the error.

One more question.

If I execute below api, it will power down not only the cpu but also the whole peripherlas?

sys_poweroff();

Below code seems only shundown the CPU not the whole peripherlas.

// Enter system off mode
NRF_POWER->SYSTEMOFF = 0x1;

If the answer is "yes", calling sys_poweroff() is right approach when battery charging state and it would makes for charger to approach I_term as soon as possible.

RE: [NCS v2.6.1] Issue with build ("/soc/pwm@4001c000 defined without sleep state")

Priyanka — Wed, 21 Aug 2024 08:50:38 GMT

Hi,

You might be getting this error because I see that you have not defined any sleep state for the pwm in the dts file. You need to specify a sleep state too, say,

&pwm0 {
status = "okay";
pinctrl-0 = <&pwm0_default>;

pinctrl-1 = <&pwm0_sleep>;

pinctrl-names = "default", "sleep";
};

&pinctrl {

...

pwm0_default: pwm0_default {
group1 {
psels = <NRF_PSEL(PWM_OUT0, 0, 22)>,
/* Other configurations */
};
};

pwm0_sleep: pwm0_sleep {

group1 {

psels = <NRF_PSEL(PWM_OUT0, 0xFFFFFFFF)>,

/* Other configurations */

};

-Priyanka