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---
breadcrumbs:
- - /chromium-os
- Chromium OS
- - /chromium-os/testing
- Testing Home
page_name: chamelium-audio-board
title: Chamelium Audio Board
---
[TOC]
## Introduction
Chamelium audio board routes audio between four endpoints with two stereo audio
buses:
* DUT device headphone jack
* Chamelium FPGA board line-out/line-in
* Peripheral speaker/microphone
* Bluetooth audio module
It helps Chamelium automate audio testing including:
* 3.5mm headphone
* 3.5mm external microphone
* Onboard internal speaker
* Onboard internal microphone
* Bluetooth A2DP playback
* Bluetooth HSP/HFP playback
* Bluetooth HSP/HFP record
## Components
* Chamelium
> > <img alt="AB_2.jpg"
> > src="https://lh6.googleusercontent.com/J7i4-sT2ydPrJmJQo1IZ-e_0PUmoN0R_rXN-1QLIMLDaUIlUfeLj9ZZVe2GgvjhoatKCLu9S-w4iLn8nyxZVVtBvEcKNogcUMgS-9YCHhThkHhem-sSRYnPfeD-F4tNziOghxMaU"
> > height=274 width=400>
* Audio Board Block Diagram
> > [<img alt="image"
> > src="/chromium-os/testing/chamelium-audio-board/Chameleon%20Audio%20-%20New%20Page%20%284%29.png"
> > height=283
> > width=400>](/chromium-os/testing/chamelium-audio-board/Chameleon%20Audio%20-%20New%20Page%20%284%29.png)
* Audio Board
> > <img alt="AB_1.jpg"
> > src="https://lh5.googleusercontent.com/OyD9hcw981gB6wUOTVHdweNJAV28gvT9hBp5wiFxnv80SXrfFr0l43tmMqFicK-XM6Mbqn8MOsCme7IOAVkMxr1fwlolWN7IKNP_wpfeDa9g_S0qub2SQMe4EZjgtfRNvX3jp54P"
> > height=308 width=400>
* Two 3-ring (TRS) audio jack cables
* One 4-ring (TRRS) audio jack cable
* One serial ribbon cable (connecting CN4 on audio board with
J13_LTC_CON on FPGA)
* USB-A to mini-USB cable
* 3-ring (TRS) 3.5mm microphone
## Bootstrap
Connect audio board and FPGA board with the serial ribbon grey cable (see
the assembled picture).
Connect audio board and Chamelium line-in and line-out (blue jack to blue
jack, green jack to green jack) using two 3.5mm 3-ring(TRS) cables.
For audio jack external audio - connect tested device with audio board using
3.5mm 4-ring (TRRS) cable.
For USB audio - connect tested device with the middle USB port on FPGA (top)
board.
For internal speaker test - connect a mono microphone (two conductor, TS
connector) to the pink port on the FPGA (top) board.
For internal microphone test - connect a speaker to black SPK port on audio
board.
For Bluetooth test - Chamelium Eth MAC and audio board BT MAC should be
related in chameleon_info.
## Setup Chamelium Info
Use the interactive script ~/trunk/src/platform/chameleon/client/test_server
to connect to chameleond server.
~/trunk/src/platform/chameleon/client/test_server
--chameleon_host=<chameleon ip>
Get the MAC address of chamelium: >>> p.GetMacAddress()
'94:eb:2c:00:01:27'
Disable the bluetooth module on audio board:
>>> p.AudioBoardDisableBluetooth()
ssh into Cros device:
ssh chromeos1-row5-rack1-host2.cros
Use bluetoothctl to turn on adapter and start scanning
localhost ~ # bluetoothctl
\[NEW\] Controller 7C:7A:91:9A:EE:89 Chromebook \[default\]
\[bluetooth\]# power on
Changing power on succeeded
\[bluetooth\]# scan on
Discovery started
\[CHG\] Controller 7C:7A:91:9A:EE:89 Discovering: yes
Enable the bluetooth module on audio board using test_server: >>>
p.AudioBoardResetBluetooth()
In bluetoothctl console, check there is a new **SX3868-3Y** device being
scanned:
\[NEW\] Device 00:1F:84:01:03:5B SX3868-3Y
\[CHG\] Device 00:1F:84:01:03:5B RSSI: -67
\[CHG\] Device 00:1F:84:01:03:5B RSSI: -56
\[CHG\] Device 00:1F:84:01:03:5B RSSI: -68
Now we know Chamelium with MAC address '94:eb:2c:00:01:27' has a Bluetooth
module with MAC address ‘00:1F:84:01:03:5B’ on its audio board.
Add the mapping info to client/cros/chameleon/chameleon_info.py
_CHAMELEON_BOARD_INFO = {
'94:eb:2c:00:00:fb': ChameleonInfo('00:1F:84:01:03:68'),
'94:eb:2c:00:01:2b': ChameleonInfo('00:1F:84:01:03:5E'),
'94:eb:2c:00:01:27': ChameleonInfo('00:1F:84:01:03:5B'), }
## Run the test
For example, run basic headphone test on a squawks board 5 times:
test_that --board=squawks --fast --debug --args="chameleon_host=$CHAMELIUM_IP"
$DUT_IP audio_AudioBasicHeadphone --iterations 5
## Test output/input devices basic function
### Output audio devices
* Internal speaker - audio_AudioBasicInternalSpeaker
* Headphone - audio_AudioBasicHeadphone
* HDMI/DisplayPort - audio_AudioBasicHDMI
* USB headphone - audio_AudioBasicUSBPlayback
* Bluetooth headphone - audio_AudioBasicBluetoothPlayback
### Input audio devices
* Internal microphone - audio_AudioBasicInternalMicrophone
* External microphone - audio_AudioBasicExternalMicrophone
* USB microphone - audio_AudioBasicUSBRecord
* Bluetooth microphone - audio_AudioBasicBluetoothRecord
## Advanced tests
* Volume control: audio_AudioVolume
* Suspend/Resume, Reboot: audio_AudioAfterSuspend,
audio_AudioAfterReboot, audio_AudioQualityAfterSuspend
* Quality and artifacts: audio_AudioArtifacts
* BT connection: audio_AudioBluetoothConnectionStability
* BT playback + record: audio_AudioBasicBluetoothPlaybackRecord
* USB playback + record: audio_AudioBasicUSBPlaybackRecord
* Chrome media player: audio_MediaBasicVerification
* WebRTC: audio_AudioWebRTCLoopback
* ARC: audio_AudioARCPlayback, audio_AudioARCRecord
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