RE: I am using nRF5340 Audio to make a CIS connection on a homemade board.

Amanda Hsieh — Tue, 30 Jul 2024 13:03:52 GMT

Hi,

The reason why the higher bitrate causes the sync mechanism not to work properly might be because the enc/dec time increased. The team suggests to extend the presentation delay configuration. NCS v2.5.0 uses the deprecated PCFT controller which we won't support anymore. Please switch to the latest NCS which uses the SoftDdevice Controller.

And since the description from the customer is not very clear, some more details

If the gateway can connect with headsets and do the audio streaming but cannot have steady pres/drift compensation, then that could be because the CPU consumes too much time
Please provide the application log if the gateway cannot establish an audio stream. It might be the config setting out of what the controller/bandwidth can achieve, then it has to reduce the retransmission times for a trial.
The 96kbps is the default setting as we tested it, and you also mentioned that you are working on the stereo channel.
It could be that you are trying to send L and R at the same ISO packets, which leads to a 240-byte encoded frame in one ISO packet, which could reach the limitation of the PCFT controller.
We will support CIS stereo in the following time which headset can receive L and R from different CISes, please stay tuned.
And please upgrade the code to the latest NCS.

-Amanda H.

RE: I am using nRF5340 Audio to make a CIS connection on a homemade board.

Junichi — Sat, 27 Jul 2024 01:07:50 GMT

NCS version is 2.5.0

It's running in mono and I want to make it work with this version.

RE: I am using nRF5340 Audio to make a CIS connection on a homemade board.

Amanda Hsieh — Fri, 26 Jul 2024 13:08:05 GMT

Hi,

What NCS version are you using? Could you try the latest version v2.7.0?

We are currently understaffed due to the summer vacation period, so delayed replies must be expected. I am sorry about any inconvenience this might cause.

Regards,
Amanda H.