Broadcast Audio URI Source

The Broadcast Audio URI is an exciting new spec that allows information about a Broadcast Audio Source to be conveyed over an out-of-band (OOB) medium to a Broadcast Audio Assistant.

This is a small PoC of how a Broadcast Audio URI can be used to expose a dynamically generated QR code on an nRF5340 Audio DK with an Adafruit 2.8" TFT shield attached.

The application is a slightly modified version of the Broadcast Audio Source sample.

After the application starts up, a Broadcast Audio URI QR code is shown on the screen like this:

Now, using a Broadcast Audio Assistant able to scan and use the code, it should be possible to add the source to a sink without the assistant scanning for the source first.

NOTE: This is just an early PoC with only a few values used. There is currently no support for things like meta data or more advanced BASE topologies.

Getting started...

If you haven't done it yet, first go to The Zephyr getting started guide and install all dependencies (I'd recommend following the path with the virtual python environment).

For development

For developers of the application, first do a fork of the repo. Then do the following:

Make a local workspace folder (to hold the repo, zephyr and west modules):

mkdir my-workspace
cd my-workspace

Clone the repo:

git clone git@github.com:<your handle>/bau-source.git

Initialize west and update dependencies:

west init -l bau-source
west update

For normal use (non-development)

This repo contains a stand alone Zephyr application that can be fetched and initialized like this:

west init -m https://github.com/larsgk/bau-source --mr main my-workspace

Then use west to fetch dependencies:

cd my-workspace
west update

Build and flash

Go to the repo folder:

cd bau-source

Build

nRF5340 Audio DK board

The nRF5340 Audio DK has two cores - one for the application and one dedicated for the network (bluetooth controller). The bluetooth controller can be builded from zephyr/samples/bluetooth/hci_ipc:

west build -b nrf5340_audio_dk_nrf5340_cpunet -d build/hci_ipc ../zephyr/samples/bluetooth/hci_ipc --pristine -- -DCONF_FILE=nrf5340_cpunet_iso-bt_ll_sw_split.conf

Application

west build -b nrf5340_audio_dk_nrf5340_cpuapp -d build/nrf5340audiodk/app app --pristine -- -DSHIELD=adafruit_2_8_tft_touch_v2

Flash

nRF5340 Audio DK board

Clear all mem for the two cores with the recover command:

nrfjprog --recover --coprocessor CP_NETWORK
nrfjprog --recover

And flash with the west command:

west flash -d build/hci_ipc

Application

west flash -d build/app