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New reworked driver for Wolfson/Cirrus Logic audio card

hiassoft

I've been working on a driver rework, mainly to get rid of the requirement to carry around a bunch of patches to upstream driver code, and also to fix some outstanding issues and introduce some new features.

 

Most issues have been ironed out so here's the first public release.

 

Edit: the driver has been included in official RPi kernels. Just run sudo rpi-update to install it.

You still have to install the mixer scripts and add the /etc/modprobe.d file. See my website for details

RPi Linux driver for Wolfson / Cirrus Logic Audio Card

 

Source: https://github.com/HiassofT/rpi-linux/tree/cirrus-ng-4.9.0

Precompiled kernel: http://www.horus.com/~hias/tmp/cirrus/cirrus-ng-linux-4.9.0.tgz

New mixer scripts: http://www.horus.com/~hias/tmp/cirrus/cirrus-ng-scripts.tgz

 

Important notes:

  • The new driver bases on the rather fresh kernel 4.9.0 which means there's some risk of (yet unknown) issues. Use it at your own risk and please run "rpi-update" to get the latest firmware before installing the new driver.
  • The soundcard name has been changed from "snd_rpi_wsp" to "RPi-Cirrus", also several ALSA controls have been removed and new ones were added. This means the old usecase scripts and any custom-made scripts will no longer work. Use the new mixer scripts instead of the old usecase/listen scripts.
  • The new driver supports setting (and receiving) of the S/PDIF channel status bits (aka AES bits). If you add an ALSA card configuration file this means applications like Kodi can do proper AC3/DTS passthrough. A sample card configuration file (plus the mixer scripts) can be found here: https://github.com/HiassofT/rpi-cirrus-config
  • I haven't fully updated the documentation on my website RPi Linux driver for Wolfson / Cirrus Logic Audio Card  yet, will do that during the next weeks/months. But except for the things noted above most stuff should still work as in previous driver versions.

 

Please report back if you tested the driver (either successfully or unsuccessfully), any feedback will help me!

 

so long,

 

Hias

Parents

  • OK, I got the never driver running using the 4.9.0 kernal on an RPI 3 with a Cirrus Audio card.

     

    I have script Lbio8.sh that runs a loop through--

     

    ./Playback_to_Lineout.sh

     

    ./Record_from_Linein.sh

     

    arecord -Dhw:1 -r 8000 -c 2 -f S32_LE | aplay -Dhw:1 -r 8000 -c 2 -f S32_LE

     

     

    when I run it I get

     

    pi@raspberrypi:~/cirrus $ ./Lbio8.sh

    Recording WAVE 'stdin' : Signed 32 bit Little Endian, Rate 8000 Hz, Stereo

    Warning: rate is not accurate (requested = 8000Hz, got = 32000Hz)

             please, try the plug plugin

    Playing WAVE 'stdin' : Signed 32 bit Little Endian, Rate 32000 Hz, Stereo

     

    However, the script works, inputs and outputs the audio.  The audio seems to have a bit of a hiss.

     

    This script worked with previous drivers for the first Wolfson Audio Card and also the CIrrus audio card (the second card, with the 40 pin interface), and there was no indication of problems with it recognizing the 8000 Hz sampling rate.

     

    Any thoughts?

Reply

  • OK, I got the never driver running using the 4.9.0 kernal on an RPI 3 with a Cirrus Audio card.

     

    I have script Lbio8.sh that runs a loop through--

     

    ./Playback_to_Lineout.sh

     

    ./Record_from_Linein.sh

     

    arecord -Dhw:1 -r 8000 -c 2 -f S32_LE | aplay -Dhw:1 -r 8000 -c 2 -f S32_LE

     

     

    when I run it I get

     

    pi@raspberrypi:~/cirrus $ ./Lbio8.sh

    Recording WAVE 'stdin' : Signed 32 bit Little Endian, Rate 8000 Hz, Stereo

    Warning: rate is not accurate (requested = 8000Hz, got = 32000Hz)

             please, try the plug plugin

    Playing WAVE 'stdin' : Signed 32 bit Little Endian, Rate 32000 Hz, Stereo

     

    However, the script works, inputs and outputs the audio.  The audio seems to have a bit of a hiss.

     

    This script worked with previous drivers for the first Wolfson Audio Card and also the CIrrus audio card (the second card, with the 40 pin interface), and there was no indication of problems with it recognizing the 8000 Hz sampling rate.

     

    Any thoughts?

Children
  • in reply to kjciszewski

    Hi Kenneth!

    pi@raspberrypi:~/cirrus $ ./Lbio8.sh

    Recording WAVE 'stdin' : Signed 32 bit Little Endian, Rate 8000 Hz, Stereo

    Warning: rate is not accurate (requested = 8000Hz, got = 32000Hz)

    please, try the plug plugin

    Playing WAVE 'stdin' : Signed 32 bit Little Endian, Rate 32000 Hz, Stereo

    There are 2 things to keep in mind:

     

    The reworked driver contains a new control "Min Sample Rate": Reset_paths.sh sets it to "off" (allowing samplerates of 8kHz and above), Playback_to_SPDIF.sh and Record_from_SPDIF.sh set it to "32kHz". The default (if you called neither scripts) is 32kHz so that explains why using 8kHz doesn't work.

     

    Just call Reset_paths.sh (and after that the record and playback scripts) or manually change the Min Sample Rate control:

    amixer cset name="Min Sample Rate" "off"

    BTW: There's also a "Max Sample Rate" control but none of the config scripts touches that and it defaults to "off". The purpose of these controls is to limit the rates for SPDIF input/output. SPDIF has a minimum limit of 32kHz and some DACs may have an upper limit of 48, 96 or 192 kHz.

     

    The other thing is that on recent Raspbian installations there's an .asoundrc file in /home/pi that sets the default device to hw:0. I'm not sure why or when this was added, but it's rather odd - the ALSA default is usually plughw:0 which allows samplerate, format, channel, ... conversion.

     

    So, better remove /home/pi/.asoundrc and ALSA should work again as expected.

     

    so long,

     

    Hias