Generating 2+ signals with accurate frequency/period

RE: Generating 2+ signals with accurate frequency/period

Susheel Nuguru — Mon, 27 Nov 2023 12:13:26 GMT

Sorry for delays, Naeem is away today and will most likely look into this tomorrow.

RE: Generating 2+ signals with accurate frequency/period

Naeem Maroof — Mon, 20 Nov 2023 07:20:32 GMT

Hello,

apologies for the delayed response.

Is there update at your end?

were you able to have a look and use the samples from the NCS?

RE: Generating 2+ signals with accurate frequency/period

lumex — Thu, 02 Nov 2023 15:13:12 GMT

Hi,

About my requirements, you can consider that I need a 2+ function generator that produces square wave signals with minimal tr (rise time) and excellent period/frequency accuracy, in order to trigger 2+ circuits (each one at a specific period/frequency).

Accuracy (hence stability) is the key requirement.

If I specify 200 Hz, it should be between, say, 199,999 Hz and 200,001 Hz (and not between 198 and 202 Hz), 199,99 200,01 Hz seems to be the worst accuracy required.
The frequency range is 1-1000 Hz, with integer values (or 1-1000 ms).

About how to achieve that with a nRF52840, I just believe that timer interrupts or low level related tools may be a good way (or the best way) to do that with excellent accuracy, without any risk to be impacted (tile drift) by functions and tasks that are slowed or blocked.

One more thing :
as a prototype, I’m using an Adafruit Feather Sense board with nRF52840. I think I’ll be able to use any library that you may recommend.
Can you confirm that ?

Thanks.

Best regards.

RE: Generating 2+ signals with accurate frequency/period

Naeem Maroof — Thu, 02 Nov 2023 12:50:09 GMT

Hello,

Thank you for contacting DevZone at NordicSemi.

Your requirements are not 100% clear to me like what you want to achieve and how you are doing it.
But if you want to generate square wave signals, then you can use the TIMER peripheral of the SoC.
You may also look at Zephyr Timers if you are using NCS.

You will be able to find samples like Zephyr Counter sample.

Regards,

Naeem

RE: Generating 2+ signals with accurate frequency/period

lumex — Tue, 31 Oct 2023 12:37:25 GMT

PS (Q1) : with an accuracy between 1E-1 and 1E-3 Hz

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