Cirrus Logic Audio Card and Raspberry Pi 3

This works great, thanks for the description.

Dekrispator is a nice little synthesizer that you may want to try. A precompiled binary for Raspberry Pi is included.

You can just start it and listen to pretty sounds that randomly change over time. In addition, you can hook up Midi devices:

Midi keyboard and Midi mixer. Once you hit the first key on the Midi keyboard, the randomizer stops and you keep playing

with the current sound. I ported the synth from STM32F4 to Linux/Mac/OSX/rPI using STK libraries.

Precompiled binary for rPI (tested on NOOBS/Raspbian with this Wolfson card)

https://github.com/erwincoumans/StkDekrispatorSynthesizer/raw/master/precompiled/App_Dekrispator_rpi

Source code:

https://github.com/erwincoumans/StkDekrispatorSynthesizer

I wanted to thank you for your guidance. I brought the Cirrus Logic card and followed your instructions and it worked first time with PI3, Noobs and 32 GB HD video class 10 Sandisk. I have now managed to use it like a cassette recorder with HiFi level quality.

Following on from when the install is completed here is some further guidance.

In terminal run the following scripts ( which must be run every time the PI is booted to connect the Cirrus Logic Audio input and output ):-

Record_from_DMIC.sh

Playback_to_Headset.sh

Now the Cirrus Logic card is operational. It works even though the speaker in the top bar shows muted audio. If you start LM Music this also shows the speaker muted with a X but the Cirrus Logic card output to headset is working.

You can download the HD_Audio test tracks provided with the Wolfson card for the old Raspberrypi A and B. They are in the download section on the element 14 website. Before they will play with LXMusic you must install the FLAC plug in. To do the use Add and Remove Software and search for XMMS2.

Select xmms2 – all plugings and install.

Now if you add the tracks to the LXMusic play list, plug in your head phones (black socket) and press play you will hear the music.

Recording is difficult using the terminal commands, but the Cirrus Logic card works like a dream with the Graphic User Interface provided by Audacity. Use Add and Remove Software, search for Audacity and install.

Start Audacity and click on the record button and speak close to the cirrus card on board microphones. The sound wave form will appear in the window. Press stop. Press the play button and your voice will appear in the headphones.

I have managed to record CD quality 44.1KHz, Video quality sound at 48 KHz both at 16 bits. The Pi also works at 24 bits 96 Khz and 196 Khz recording from the on board mics.

The CD and Video was captured from the SPDIF to do this you will need to reset the card in the terminal window.

Reset_paths.sh

SPDIF_record.sh

Playback_to_Headset.sh

I found at Maplins.co.uk an optical to coaxial SPDIF converter (A17NY), you will also need a TOSLINK optical and digital phono cables {75 Ohm Coaxial cable) to make the connection to the Cirrus Logic. Element14 are cheaper for the cables.

In Audacity you can adjust the playback volume with the slider. To adjust the record volume you will need to copy the script and edit the line. For example for copy the Record_from_DMIC.sh to a new file Record_from_DMIC_High.sh and change the lines from 116 to 150 – see below after the edit.

amixer $1 -Dhw:sndrpiwsp cset name='IN2L Digital Volume' 150

amixer $1 -Dhw:sndrpiwsp cset name='IN2R Digital Volume' 150

Save and run the new script. Now the recorded sound will be louder.

In LXMusic the volume level must also be adjusted by changing the Playback_to_Headset.sh. Copy this and rename the file for low or higher volume. For example for quieter sound change the line from 116 to 85

amixer $1 -Dhw:sndrpiwsp cset name='HPOUT1 Digital Volume' 85

It would be good to implement a digital volume control via the GPIO of the Raspberry pi, but that is for another day. Enjoy your Cirrus Logic card it sounds so nice.

I've done all that, but I only see a bright green LED. I don't think I've seen the other one on yet (let alone flash)

I managed to get it working on a rpi3b with the 4.4.6 kernel so not the newest one. Buuuuut only if I run the usecase scripts before! On a rpi2b it works without these usecase scripts... Even aplay oder speaker-test dont work without the usecase scripts before. Funniest thing my programm runs different on the rpi2b and rpi3b !! (I want to use the pi with the sound card as a filter and the rpi3b seems to do different things than only filtering on the pi2b it works fine but i get an "alsa: underrun occured" error) Any ideas how to run the sound card without these usecase scripts on the pi3b?

Does anyone just have an IMAGE that works they can share?

Hello Alan,

How are you doing on your OpenOB project?

Are you using James Harrissons OpenOB 3.2 tutorials?

I have difficulties to get the redis-server and GStreamer apps.

Literaly followed the instuctions and  bump into a lot of errors with the RPi3

I was curious if you got it to work?

Regards,

Edwin

hi alan

I'm new to RPi and I'm trying to build this looper project i found online that required the wolfson audio card.

i worked with your instructions and after the reboot i don't get anything on my screen, i don't know if the HDMI port sending data to the screen from the rpi.

any idea how i can solve this?

thanks a lot.

I got the same results.  In the process of working on this I must have deleted or installed something that is causing the conflict.  I should go back to the clean o/s image and repeat the steps and see if, or where, it fails.

I noticed today in the Element 14 store that they list the Cirrus Logic Audio Card as discontinued.  That is unfortunate if it is true.  That was a nice card that fit on the Raspberry Pi.  I have heard there are USB audio cards that work with the Pi.