topic Re: PN7642 GPIO used for PWM in NFC

PN7642 GPIO used for PWM

feisalh — Mon, 23 Sep 2024 11:04:50 GMT

Are there any examples of using the GPIO PWM functionality. In SDK 2.15.000 there is a sctimer support for PWM. However I need two PWM outputs at difference frequencies 2500Hz and 100KHz both at 50% . The sctimer example assumes both PWMs at the same frequency.

I was hoping to use the GPIO PWM function for one of the PWMs that I need.

As per the note in "fsl_sctimer.c"

" note When setting PWM output from multiple output pins, they all should use the same PWM mode i.e all PWM's should be either edge-aligned or center-aligned. When using this API, the PWM signal frequency of all the initialized channels must be the same. Otherwise all the initialized channels' PWM signal frequency is equal to the last call to the API's pwmFreq_Hz.

Re: PN7642 GPIO used for PWM

danielchen — Thu, 26 Sep 2024 07:49:49 GMT

There are 3 demos for sctimer. it is under driver_examples/

Regards

Daniel

Re: PN7642 GPIO used for PWM

feisalh — Thu, 26 Sep 2024 20:17:33 GMT

Please re-read my question. I indicated in the first sentence that I already reviewed the sctimer examples.

My question is specifically about having to run two PWM at two different frequencies. I included the note from the "fsl_sctimer.c" in my question.

This note implies that the API is limited to one frequency for all three PWM modules. Is that correct?

"When using this API, the PWM signal frequency of all the initialized channels must be the same. "

Are there any other resources of support examples for the PN7642 other than the SDK ?

Re: PN7642 GPIO used for PWM

danielchen — Tue, 01 Oct 2024 09:48:24 GMT

sorry we don't have other examples for PWM.