nRF5340 Audio DKs losing sync in external I2S loopback

RE: nRF5340 Audio DKs losing sync in external I2S loopback

AHaug — Wed, 17 Jul 2024 07:30:54 GMT

Happy to hear that you were able to resolve it!

I'll mark this case as verified and since I'll be out of office for holidays this week I would recommend that you create a new case and refer to this one in case you have any additional follow ups after I leave so that you can get a faster follow up from us! :)

Kind regards,
Andreas

RE: nRF5340 Audio DKs losing sync in external I2S loopback

GeneF — Tue, 16 Jul 2024 21:57:42 GMT

Sorry - please ignore CMake Error above. New App. I forgot to add build configuration.

nrf5340 Audio example builds, programs and runs.

Thanks for all your help

RE: nRF5340 Audio DKs losing sync in external I2S loopback

GeneF — Tue, 16 Jul 2024 15:40:17 GMT

Yes, I have made a clean copy of the nrf5340_audio example from SDK 2.7.0 in a new directory.

After modifying buildprog.py I get a new error message from sysbuild:

CMake Error at C:/nordicsemi/v2.7.0/zephyr/cmake/modules/boards.cmake:320 (message):
Board qualifiers `/nrf5340/cpuapp--sysbuild` for board `nrf5340_audio_dk`
not found. Please specify a valid board target.

Valid board targets for nrf5340_audio_dk are:

nrf5340_audio_dk/nrf5340/cpuapp

nrf5340_audio_dk/nrf5340/cpuapp/ns

nrf5340_audio_dk/nrf5340/cpunet

How do I add board targets for sysbuild?

RE: nRF5340 Audio DKs losing sync in external I2S loopback

AHaug — Tue, 16 Jul 2024 14:22:15 GMT

Could you clarify if you've copied the nrf5340 audio project to another path when using 2.7.0?

And yes, apparently there is an issue related to sysbuild, there's a PR to fix it here: https://github.com/nrfconnect/sdk-nrf/pull/16449

Kind regards,
Andreas

RE: nRF5340 Audio DKs losing sync in external I2S loopback

GeneF — Mon, 15 Jul 2024 21:28:08 GMT

Thank you very much for your assistance.

Audio synchronization appears to work when running external I2S with debug code & logging. It just doesn't quite sync when running external I2S with release mode code.

I would like to try the nrf5340_audio example from SDK v2.7.0. However buildprog.py in 2.7.0 fails to program the DK - error message is "NET core hex not found. Built as APP core child image. I suspect this has to do with sysbuild changes. How do I build / program the DK with the new version of the nrf5340 Audio App?

RE: nRF5340 Audio DKs losing sync in external I2S loopback

AHaug — Mon, 15 Jul 2024 10:37:06 GMT

In addition, do you see any changes when when upgrading to NCS v2.7.0? We've done some improvements for the sync on unicast scenario.

And to emphasize the logs, it would be great to get the application log so we can see what's happening.

Could you verify if you set the nRF5340 as I2S master?

The sync is mechanism is relying on

The I2S block completed callback which triggered every 10ms
The timestamp from controller

So if the I2S is still working as expected, then there should be no issue on the sync mech. If I2S is not working as expected however..

Kind regards,
Andreas

RE: nRF5340 Audio DKs losing sync in external I2S loopback

AHaug — Mon, 15 Jul 2024 08:38:56 GMT

Noted, thank you for checking and elaborating. I'll bring this up to the discussion with my colleagues.

In the meanwhile do you have any device logs that could indicate if things are running as they should or not?

Kind regards,
Andreas

RE: nRF5340 Audio DKs losing sync in external I2S loopback

GeneF — Fri, 12 Jul 2024 19:35:21 GMT

Additional information:

When I initialize the hardware codec on the gateway the external I2S audio is fine & led 2 on the gateway lights up. If I don't initialize the hardware codec on the gateway the external I2S audio has clicks in it (about 4 per second) and led 2 on the gateway does not light. Still need help figuring out why.

RE: nRF5340 Audio DKs losing sync in external I2S loopback

GeneF — Fri, 12 Jul 2024 13:54:16 GMT

Thanks for the reply. I am running external I2S bus and not using the hardware codec on the unicast_client. My guess is that frequency drift compensation stops working when I disable the hardware codec on the unicast_client.

RE: nRF5340 Audio DKs losing sync in external I2S loopback

AHaug — Fri, 12 Jul 2024 13:38:44 GMT

Hi,

I will have to discuss this with the Audio team, but in the meanwhile have you seen this part of the documentation? https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/applications/nrf5340_audio/doc/firmware_architecture.html#synchronization_module_overview I think this should answer most of your questions, but let me know if things are still unclear after this

Kind regards,
Andreas