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August 18, 2014 / consort3

Raspberry Pi Part 2

Updated 11 May 2016

I wondered about using a Raspberry Pi and Wolfson audio card as a cost effective active crossover filter. So I bought both. I found the Pi to be a compact, low power, noise free computer. I bought it with the NOOBs operating system pre-installed on a SD card. I was surfing the net using Midori very soon as it was plug and play. It crashed occasionally but it was like being back in the Windows 3.1 and DOS days. However the Wolfson card was a problem. Although some extol its virtues, unless you are very computer literate, I would not buy this card. I had upgraded the operating system on-line from 3.10 to 3.12. This was unfortunate as Ragnar had based his working system for the Wolfson around the 3.10 version! However I found Georg had a way to update a later system. I found this was incomplete though and had to use some of Ragnars files to complete it. Even then I still needed a player. Perhaps it would be easier to download an image of Mikelangelos Volumio onto a SD card. The support since Wolfson was bought by Cirrus has not been evident. The features of the Wolfson are tantalising though. The board has 4 channels of parametric EQ and 4 channels of low or high pass filters. Marki has published a way of using Wolfson tools to program the Alsamixer

Georg

http://blog.georgmill.de/2014/04/29/compile-wolfson-audio-card-driver-for-kernel-3-12-y-a-new-try/

Update

http://blog.georgmill.de/2015/02/18/update-for-wolfson-audio-card-on-raspberry-pi/

Ragnar

https://www.element14.com/community/message/178522/l/re-wolfson-modified-noobs-raspbian-zipped-img-cannot-unzip-new-download

Marki

https://www.element14.com/community/community/raspberry-pi/raspberry-pi-accessories/wolfson_pi/blog/2014/08/17/wolfson-audio-paths-how-to-use-eq-and-lhpf

This DIYaudio thread gives some clues as to how to configure the WM5102

http://www.diyaudio.com/forums/pc-based/276833-cirrus-logic-audio-card-pi2-crossover.html

In the end I used SDformatter to format the SD card with the Format size adjustment on then used Win32diskimager to write Ragnars image file, then I loaded LXaudio and finally set the playback to lineout script. As someone pointed out Ragnar rocks! Another way of compiling the kernel (in German)

http://blog.thul.org/technik/betriebssysteme/kernel-fuer-die-wolfson-pi-audio-card-kompilieren/

Volumio thread

http://volumio.org/forum/wolfson-audio-card-with-volumio-t851.html http://www.bostonenginerd.com/posts/getting-the-wolfson-audio-card-working-with-volumio/

Cirrus has released a new board compatible with the RaspberryPi A+ and B+ models and with that some new drivers, also a new image file on the Element 14 website

http://openelec.tv/forum/124-raspberry-pi/69870-wolfson-audio-card-support?start=150#124935

At present (6/2/15) the Cirrus card will not work with the Raspberry PI 2. It needs Cirrus to complete their work on the 3.18 driver.

https://www.element14.com/community/community/raspberry-pi/raspberry-pi-accessories/cirrus_logic_audio_card/blog/2015/01/16/cirrus-logic-audio-card-2015-update

A camera with Xenon flash upsets the Pi2:

http://www.raspberrypi.org/forums/viewtopic.php?f=28&t=99042

Update Cirrus have completed their work on the 3.18 driver (i.e Raspberry2)

http://github.com/CirrusLogic/rpi-linux/wiki/Building-the-code

Using Debian Jessie

https://stmllr.net/blog/cirrus-logic-audio-card-on-raspberry-pi2-with-debian-jessie/index.html

A cheaper way of implementing Raspberry PI crossover using generic USB dac

http://www.diyaudio.com/forums/pc-based/274331-ladspa-plugin-programming-linux-audio-crossovers.html

Thread on the crossover idea

http://www.diyaudio.com/forums/pc-based/276833-cirrus-logic-audio-card-pi2-crossover.html

A programmable digital expander for the PI Guzunty

https://github.com/Guzunty/Pi/wiki

First Pi in space note date

http://www.raspberrypi.org/first-pi-in-space/

Watch out for 19 January 2038. Another millenium bug?

http://motherboard.vice.com/en_uk/read/32-bit-integers-and-why-old-computers-matter

Amazingly the same counter overflow has just happened on the B787 248 day problem!

The most cost effective way to get audio out of the Pi zero

https://learn.adafruit.com/introducing-the-raspberry-pi-zero/audio-outputs

But this will be better the Phat Dac

https://shop.pimoroni.com/products/phat-dac

Adding ethernet to the Pi Zero

http://raspi.tv/2015/ethernet-on-pi-zero-how-to-put-an-ethernet-port-on-your-pi

Avaliability of Pi Zero

https://www.raspberrypi.org/forums/viewtopic.php?p=951228#p951228

Access to the on board graphics processor

http://hexus.net/tech/news/graphics/90491-raspberry-pi-2-gets-hardware-accelerated-opengl-support/

Raspberry Pi3 with wi-fi
http://www.theregister.co.uk/2016/02/26/raspberry_pi_3/

Combined DAC and class D amplifier for the Pi

Pi-DigiAMP+ – IQaudIO Limited

Bluetooth audio with Pi3

https://www.raspberrypi.org/blog/another-update-raspbian/

Matthias has a new driver for the Wolfson/Cirrus card. The Cirrus card is obsolete

https://www.element14.com/community/thread/57975/l/new-reworked-driver-for-wolfsoncirrus-logic-audio-card

DAC plus amp for the Pi Zero

https://www.justboom.co/product/justboom-amp-zero-phat/

Pi internet radio

http://www.bobrathbone.com/raspberrypi_radio.htm

Interesting thread on Pi audio

https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=136445

Raspberry PI with squeezebox

https://opensource.com/article/17/5/squeeze-pi-audio?sc_cid=70160000001273HAAQ

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