Audio Cape RevA

Jump to: navigation, search


BeagleBone Audio Cape

The BeagleBone Audio Cape provides stereo audio input and output for the BeagleBone by using the TLV320AIC3106 codec. Audio data is sampled at up to 96 kHz during recording or playback. The codec interfaces with the Multichannel Audio Serial Port of the AM335x via audio serial bus. The BeagleBone Audio Cape also features two standard 3.5mm audio jacks as audio input and output connectors.

Revision Changes

Revision A1

The only changes in this revision are PCB silkscreens to accommodate the release of Audio Cape and DVI-D with Audio Cape. No design changes have been made for the BeagleBone Audio revision A1.

The PCB revision is also changed from BB-BONE-DVID-PCB-03 to BB-BONE-DVID-PCB-04.

Revision A

Initial release of BeagleBone Audio Cape.

Software Support

  • BeagleBone Audio Cape revision A and A1 are supported by Angstrom release 08-14-12 or later.

  • Major BeagleBone image releases can be downloaded here.
  • Intermediate BeagleBone image releases can be downloaded here

Please follow the instructions here to write the image file to your SD card on a Windows machine.

Getting Started

Required setup:

  • A BeagleBone Audio Cape
  • A BeagleBone (with supported software)
  • A stereo speaker with a 3.5mm audio input jack
  • A 3.5mm male to male audio cable
  • A USB cable
  • A PC

Following the instructions below to start using your BeagleBone Audio Cape:

  1. Mount the BeagleBone Audio Cape on top of BeagleBone.
    • Note: The Ethernet connector on BeagleBone should fit right into the cutback on BeagleBone Audio.
  2. Make sure the micro SD card using with BeagleBone has latest Angstrom image.
  3. Connect the audio input jack of speakers to the audio output connector on the BeagleBone Audio.
  4. Connect the audio output from PC to the audio input connector on the BeagleBone Audio using a 3.5mm male to male audio cable.
  5. Open a media player on PC and play an audio file repeatedly.
  6. Connect the BeagleBone to PC using a USB cable. Remember the port number of this connection.
    • Note: In Windows, the serial port number can be viewed under “Ports (COM & LPT)” section inside “Device Manager”. To open the “Device Manager” windows, right-click “My Computer”, choose “Properties”, select the “Hardware” tab, and click “Device Manager”.
  7. Open a terminal application (Teraterm, Hyperterminal, etc) and open new connection with following settings: baud rate - 115200, data – 8 bit, parity – none, stop – 1 bit, flow control – none. Select the port corresponding to the USB connection. Log in as root.
  8. Change the ALSA mixer settings by running the command "alsamixer". A preset settings can also be downloaded here.
    • To apply the preset settings for ALSA mixer, copy the preset file "asound.state" to /var/lib/alsa/ on SD card.
  9. Start the audio test script by running the command "testaudio".
  10. The script will test the audio playback by playing a beep sound to speakers.
  11. The script will record 1 second of the currently playing audio file on PC and play it back to speakers.


Followings are some specifications of the BeagleBone Audio Cape:

Electrical Specifications

Power 3.3V via expansion header
5V via expansion header
Audio Connector 3.5mm standard stereo jack
Indicators Two user LEDs
Connectors Two 46-position headers
One 10-position header

Mechanical Specifications

Size 2.15" x 3.40"
Layers 4
PCB Thickness .062"
RoHS Compliant Yes

Signal Usage

BeagleBone LCD7 Pin Usage

The BeagleBone Audio Cape revision A uses 12 signals including:

  • VDD_3V3EXP
  • SYS_5V
  • DGND
  • USR0
  • USR1
  • I2C_SDA
  • I2C_SCL


EEPROM Suport Yes
Board Name BeagleBone Audio Cape
Version 00A0
Manufacturer BeagleBoardToys
Part Number BB-BONE-AUDI-01
Pins Used 21


Product Images


System Reference Manual

Hardware Files

BeagleBone Audio Revision A1

Only PCB is changed in this revision. No design changes are made.

BeagleBone Audio Revision A

To download all files at once please click here

To go back to the cape list, please click here