PWM doesn't set 100% duty cycle properly with PM_DEVICE_RUNTIME enabled

RE: PWM doesn't set 100% duty cycle properly with PM_DEVICE_RUNTIME enabled

Kazi Afroza Sultana — Thu, 30 Apr 2026 06:55:31 GMT

Hello Timothy,

It's good that you have found a way.

Could you please share me your project file so I can reproduce the issue form my side and also can investigate a bit more before reporting to the team?

Thanks.

Kazi

RE: PWM doesn't set 100% duty cycle properly with PM_DEVICE_RUNTIME enabled

timl2415 — Wed, 29 Apr 2026 17:20:10 GMT

Hi Kazi,

I've fixed the issue temporarily by making the pwm20_sleep and pwm20_default configurations the same. It should be addressed in the NCS samples since they all set low-power-enable on pwm_sleep pinctrl, or perhaps fixed in the driver.

RE: PWM doesn't set 100% duty cycle properly with PM_DEVICE_RUNTIME enabled

Kazi Afroza Sultana — Wed, 29 Apr 2026 10:10:30 GMT

Hello,

You have low power enable in the sleep mode. Can you try to bias-pull-up instead?

pwm20_sleep: pwm20_sleep {
        group1 {
            psels = <NRF_PSEL(PWM_OUT0, 1, 17)>,
                <NRF_PSEL(PWM_OUT1, 1, 18)>;
            bias-pull-up;
        };