RE: Questions about PWM's end delay and initialized unused channels

TS Gowtham — Thu, 18 Feb 2021 07:27:57 GMT

Thanks Sigurd!!

RE: Questions about PWM's end delay and initialized unused channels

Sigurd — Mon, 15 Feb 2021 19:24:27 GMT

Hi,

[quote user=""]I am trying to use the end delay parameter to control the duration the LED stays dimmed. I noticed that end delay is ignored when the playback count is 1. I changed playback count to 2 and the LED stayed dimmed for that duration. So is end delay ignored when playback count is 1? I would like to avoid using a timer to turn off the LED after a specific duration.[/quote]

Yes, I believe this is a limitation. If I understand what you are trying to achieve correctly, and if you are seeing this using nrf_drv_pwm_simple_playback(), then perhaps a workaround would be to just add your last duty cycle value in another separate sequence(seq1), and use nrf_drv_pwm_complex_playback(seq0,seq1) instead.

[quote user=""]At any point of time, I am only using one of the LEDs. So considering the power consumed, is it better to configure the 3 LEDs to 3 PWM channels or is it better to reconfigure the peripheral to use 1 channel with a different LED each time. In short, I would like to know how much current would be consumed by the PWM peripheral if a channel is initialized but not used.[/quote]

AFAIK, it will not consume any current if you only initialize it.