CC256x TI Bluetooth Stack A2DPDemo App

Return to CC256x Tiva TI’s Bluetooth Stack Basic Demo APPS

Demo Overview

The A2DP demo allows the user to stream high quality audio from one device to another. The A2DP profile on the TIVA M4 board acts as a sink and source and can control and send/receive audio to a remote Bluetooth Device.
It is recommended that the user visits the kit setup Getting Started Guide page before trying the application described on this page.

Note: An external codec MUST be connected to the TM4C129x 2xSPI interfaces to play and record audio.

Running the Bluetooth Code

Once the code is flashed, connect the board to a PC using a miniUSB to USB cable. Once connected, wait for the driver to install. It will show up as Tiva Virtual COM Port(COM x) under Ports(COM & LPT) in the Device manager.

Demo Application

This section provides a description of how to use the demo application to connect to an A2DP source and communicate over Bluetooth.

Demo operation as a Sink

We discuss the operation of the demo as a A2DP Sink device below.

Device 1 (Sink) setup on the demo application

a) Follow the steps in the running the bluetooth code section to setup the sink.

b) Set the name of the device. In the A3DP+SNK>>> prompt enter SetLocalName a3dpmsp430. Note that you can replace a3dpmsp430 with any other name.

c) If you are connecting to an Apple Device, you will need to set the class of device as well. In the A3DP+SNK>>> prompt enter SetClassOfDevice 0x040424. This set's the class of device to a headset.

d) Connect a Headphone to the HP-OUT to listen to audio.

e) Run an inquiry from the command line.

Device 2 (Source) Setup

a) In the Bluetooth settings menu, search for and Pair with the A2DP demo. We should see an AUD stream open indication on the TIVA board.

A3DP Commands

a) Open the music player application. Play music. You should hear the audio from the HP-OUT jack.

b) To Control the audio, we send PassThrough commands. For example to send a play after pausing music, type SendPassThroughCommand <Inquiry-Index of Connected Device> <Timeout> <1>

Demo operation as a Source

We discuss the operation of the demo as a A2DP Source device below.

Device 1 (Source) setup on the demo application

a) Follow the steps in the running the bluetooth code section to setup the device but select Source in the prompt.

b) Set the name of the device. In the A3DP+SRC>>> prompt enter SetLocalName a3dpmsp430. Note that you can replace a3dpmsp430 with any other name.

c) Run an inquiry from the command line.

Device 2 (Sink) Setup

a) The sink is any device that can receive stereo bluetooth audio like speakers or headphones. Turn on the device and make it discoverable.

b) From the Source, do a OpenRemoteStream <Inquiry index of Sink> to connect. Here, it is OpenRemoteStream 2. You will get a AUD stream open notification on the Source and if the device supports it, a visual or audio confirmation from the Sink.

A3DP Commands

a) Open the music player application. Play music. You should hear the audio from the HP-OUT jack.

b) To play music, enter Play. To stop, enter Stop. You should hear audio output from the sink.