How to use GRTC.CC[0] with NRFX?

RE: How to use GRTC.CC[0] with NRFX?

dejans — Wed, 05 Nov 2025 10:28:49 GMT

Hi,

[quote user="markrages"]Is there any plan to fix this in future releases to allow the NRF_GRTC->INTERVAL feature to be used?[/quote]

There is an internal feature request that will be considered. For specific future plans and timelines when this might get fixed, please contact your regional sales manager.

Best regards,
Dejan

RE: How to use GRTC.CC[0] with NRFX?

Mark Rages — Tue, 04 Nov 2025 15:58:20 GMT

Thank you, I was wondering if I have to modify the SDK.

Is there any plan to fix this in future releases to allow the NRF_GRTC->INTERVAL feature to be used?

Even wrapping that #define with "#ifndef ..." would be sufficient, as I could add the definition as compiler arguments.

RE: How to use GRTC.CC[0] with NRFX?

dejans — Tue, 04 Nov 2025 09:26:27 GMT

Hi,

Channel 0 is always used by nrfx. For now, it is not possible to configure nrfx project in such a way that you use GRTC channel 0. As a workaround, you could try to change main channel number here.

Best regards,
Dejan

RE: How to use GRTC.CC[0] with NRFX?

Mark Rages — Mon, 03 Nov 2025 16:14:46 GMT

> Which NCS version do you use?

NCS 2.9.2, as pinned by Ant.

> Can you provide some details about your project? Why do you need to use GRTC channel 0?

I will PPI the CC[0] event to a GPIOTE toggle task. This is the only way to make an unjittered square wave of arbitrary frequency with the nRF54.

> Can you provide full log which shows the error?

It is a static assert. You want the build log?

RE: How to use GRTC.CC[0] with NRFX?

dejans — Mon, 03 Nov 2025 11:25:13 GMT

Hi,

Which NCS version do you use?

[quote user=""]I need to use GRTC channel 0 in a nRF54L15 project.[/quote]

Can you provide some details about your project? Why do you need to use GRTC channel 0?

[quote user=""]It fails this assertion in `nrfx_grtc.c`[/quote]

Can you provide full log which shows the error?

Best regards,
Dejan