This is the documentation for the latest (main) development branch of Zephyr. If you are looking for the documentation of previous releases, use the drop-down list at the bottom of the left panel and select the desired version.

USB Audio microphone & headphones


This sample app demonstrates use of a USB Audio driver by the Zephyr project. This very simple sample that performs loopback over IN/OUT ISO endpoints. The device will show up as two audio devices. One Input (Microphone) and one Output (Headphones) device.

Building and Running

In order to build the sample an overlay file with required options must be provided. By default app.overlay is added. An overlay contains software and hardware specific information which allow to fully describe the device.

After you have built and flashed the sample app image to your board, plug the board into a host device.


Steps to test the sample:

  • Build and flash the sample as described above.

  • Connect to the HOST.

  • Chose default Audio IN/OUT.

  • Start streaming audio (for example by playing an audio file on the HOST).

  • Start recording audio stream (for example using Audacity).

  • Verify the recorded audio stream.

This sample can be found under samples/subsys/usb/audio/headphones_microphone in the Zephyr project tree.