See Github repository for files and source code: ADAU1701 driver repo.

Comment on the used kernel version:

Users of the newest version of Raspbian Jessie (kernel version 4.9.35-v7+) have to update their kernel first, because needed modules weren't included at this time.

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The current kernel version can be checked with the following command:

> uname -a

Update to Kernelversion 4.9.80-v7+ (higher versions also possible) with:

> sudo rpi-update 5c80565

Installation guide for Raspbian (in a Terminal-Window or SSH-Client):

(Volumio users see below)

Install git:

> sudo apt-get install git

Clone files:

> git clone https://github.com/MKSounds/ADAU1701-I2S-Audio-Driver-for-Raspberry-Pi.git

Copy overlay file to overlays directory:

> sudo cp ADAU1701-I2S-Audio-Driver-for-Raspberry-Pi/adau1701-i2s.dtbo /boot/overlays

Relink the overlay to the device tree: Therefore config.txt has to be modified.

Open the file with:

> sudo nano /boot/config.txt

Search for the following line and comment it with a hash (navigation with arrow keys):

Digital Audio Drivers Windows 10

#dtparam=audio=on

Add the following line at the end of the file:

dtoverlay=adau1701-i2s

Close the editor by pressing STRG+X and save the changes with y.

If you want to play files which don't use 48 kHz sample rate, you have to resample the audio data. Therefore a ALSA config file will be used, which will affect the whole audio output of the system.

Create file and open it (if it's already existing and there is code in it, you have to integrate the new code or delete the existing):

> sudo nano ~/.asoundrc

Copy and paste the following lines (paste by right clicking):

pcm.InterpolatedOutput {

type plug

slave {

pcm 'hw:0,0'

format S24_LE

rate 48000

}

}

pcm.!default InterpolatedOutput

Close the editor by pressing STRG+X and save the changes with y.

Reboot:

> sudo reboot

After a reboot the ADAU1701 I²S output should be present as an output device (without any controls!).

You can check if everything worked correctly by typing:

Realtek Digital Audio Driver

> aplay -l

You should see the following output:

pi@raspberrypi:~ $ aplay -l

**** List of PLAYBACK Hardware Devices ****

card 0: Output [ADAU1701 I2S Output], device 0: bcm2835-i2s-dit-hifi dit-hifi-0 []

Subdevices: 1/1

Subdevice #0: subdevice #0

You are now able to play sound via music player of your choice (tested with Audacity and LX music player).

Installation guide for Volumio:

(Volumio version: 2.389 2018-03-26)

Set-up the volumio partition and go through the installation wizard. Don't choose an I²S-soundcard already.

Activate SSH via a SSH file directly in the boot partition or via DEV zone in Volumio: Link

SSH-user and -password are 'volumio'. For sudo commands you have to type the password again.

Install git (should be included in Volumio):

> sudo apt-get install git

Clone files:

> git clone https://github.com/MKSounds/ADAU1701-I2S-Audio-Driver-for-Raspberry-Pi.git

Copy overlay file to overlays directory:

> sudo cp ADAU1701-I2S-Audio-Driver-for-Raspberry-Pi/adau1701-i2s.dtbo /boot/overlays

Integrate the ADAU1701 soundcard in the dropdown menue of Volumio:

Open the file dacs.json with:

> sudo nano /volumio/app/plugins/system_controller/i2s_dacs/dacs.json

Add (copy&paste) the following line as new first device in the list of available I²S devices:

Audio Labs Speakers

{'id':'adau1701-i2s','name':'ADAU1701 I2S Output','overlay':'adau1701-i2s','alsanum':'1','mixer':','modules':','script':','needsreboot':'yes'},