nrf5340 audio occurred audio interruption when connected to RTT

RE: nrf5340 audio occurred audio interruption when connected to RTT

LandyWang — Tue, 06 Oct 2026 09:42:54 GMT

After disabling CONFIG_CLOCK_CONTROL_NRF_K32SRC_SYNTH and adding other settings to ipc_radio\prj.conf, the program works on the custom board.

It seems the previous failure was due to the net core not being configured for the RC oscillator.

Now that it's configured correctly, the audio interruption issue is resolved.

Thank you for your assistance.

RE: nrf5340 audio occurred audio interruption when connected to RTT

Turbo J — Tue, 06 Oct 2026 08:44:18 GMT

Check DTS. Newer SDK version have all of this clocking stuff moved into the device tree files.

The synth RTC has too much jitter for reliable BTLE operation AFAIK. No idea why the RC oscillator won't work for you, its supposed to work with calibration and temperature compensation enabled.

RE: nrf5340 audio occurred audio interruption when connected to RTT

LandyWang — Tue, 06 Oct 2026 07:37:18 GMT

Thank you for your reply.

My custom board doesn't have a soldered 32.768 kHz external crystal oscillator. It only works when CONFIG_CLOCK_CONTROL_NRF_K32SRC_SYNTH is enabled.

I didn't encounter this problem when developing with nRF Connect SDK version v2.2.0 using the same configuration.

Now, even after adjusting prj.conf to only have CONFIG_CLOCK_CONTROL_NRF_K32SRC_SYNTH=y, I still experience audio interruptions after connecting to the RTT.

RE: nrf5340 audio occurred audio interruption when connected to RTT

Turbo J — Tue, 06 Oct 2026 06:56:26 GMT

You never want CONFIG_CLOCK_CONTROL_NRF_K32SRC_SYNTH=y when BTLE is enabled, ever. Its not a supported config.