RE: Dual mode on nrf5340 - Receive Bluetooth classic/LE->12s, simultaneous with i2s->unicast to different device

Maria Gilje — Mon, 20 Jul 2026 14:22:34 GMT

Hi Joe,

Our Bluetooth LE Audio implementation for the nRF5340 supports bidirectional CIS (Connected Isochronous Streams), and we have implementations for I2S source and sink in the application as well. We do not support Bluetooth Classic.

Please refer to our reference application for LE Audio here: https://nrfconnectdocs.nordicsemi.com/ncs/3.4.0/nrf/applications/nrf_audio/index.html, and specifically the Unicast client, Unicast server, and the application configuration pages.

[quote user=""]Secondly I know there has been discussion previously about slave mode not working for i2s on the part (due to drift compensation) - is this still the case, or has there been any update on this?[/quote]

We still have the requirement for the nRF5340 to be the I2S slave.

Please let me know if anything is unclear or if you have any follow-up questions.

Best regards,

Maria