PLEASE NOTE: This article is obsolete or related to a discontinued product.

Daisy 16 V2 audio adapter

Audio adapter daisy module for Terra and Aria G25 boards based on Wolfson microelectronics WM8731 Audio CODEC

The audio codec used is the WM8731, is low power stereo codec with an integrated headphone driver, stereo line-out, stereo line-in and mono microphone level audio inputs.

WM8731 Codecs is supported by the Linux kernel and works with alsa drivers.

Main features

  • Stereo 24-bit, multi-bit sigma delta ADCs and DACs are used with oversampling digital interpolation and decimation filters.
  • Highly Efficient Headphone Driver
  • Audio Performance : ADC SNR 90dB at 3.3V , DAC SNR 100dB at 3.3V
  • Low Power : Playback only 22mW
  • Selectable ADC High Pass Filter
  • Microphone Input and Electret Bias with Side Tone Mixer
  • Dimension: 40x40mm


PIN Aria G25
1 3V3 W24
2 RF W16 (PA29)
3 RD W14 (PA27)
4 TK W11 (PA24)
5 TF W12 (PA25)
6 TD W13 (PA26)
7 SDA W17 (PA30-SDA0)
8 SCL W18 (PA31-SCL0)
9 RK W15 (PA28)
10 GND W1


The daisy connectors where to plug this board are:

Board Daisy Connector

Kernel configuration and device tree binding

The Kernel configuration, device tree bindings and source patches are available on this article:

Schematics, datasheets and related links

Install alsa-utils

~# apt-get install alsa-utils

Run alsamixer:

~# alsamixer -V all

Configure alsa in this way:

Record and play

Save 5 second of stereo audio in a .wav file:

~# arecord -d 5 -v -v -Dhw:0,0 -f cd record_line_in.wav

Play the .wav file:

~# aplay record_line_in.wav

Change volume:

~# amixer set Master 10%-