First sound: cirrus logic configuration

The cirrus logic audio card drive is standard in the linux 4.14.52 kernel supplied by Alpine Linux, and the driver loads when the firmware overlay is installed.  After this, it is necessary to configure the card as desired using the amixer cset capability.  The original versions have been updated for the current driver and can be found at http://www.horus.com/~hias/tmp/cirrus/cirrus-ng-scripts.tgz.  They have been rewritten to use a common function definition script file and the new register names.

I use a Sony Stereo ceramic electret condenser mic ECM-CS3 which needs a 5v mic bias.  The script Record_from_Linein_Micbias.sh sets the cirrus logic card up fine for this and recording works fine.  Playback currently through a pair of earbuds for testing.

The idea is to put the RPi, a battery and the mic in a small satchel bag and put it on the floor in the middle of the acoustic jam sessions to record the tunes.  I plan to setup an Open Sound Control interface on a tablet to adjust the mix, more on that to come.

Dependencies: Building the rest of the lot

Ardour 5.12 has lot of opensource library dependencies.  Many of them are available already built in the Alpine Linux armv7 repository, and the rest have to be built from source.  This is not trivial.  I was able to install 58 tools and libraries with the get_alpine_deps.sh script found on my audiopi gitlab repository.

The other 23 need to be configured and compiled from source.  See ardour_dep_urls.txt.

The gory details of waf, perl, configure etc are not of tremendous interest except where the default process needs a nudge.   I'll document what I did for the following to make them compile and install on Alpine Linux.  I'm using 

./configure --prefix=/usr/local
 ./waf configure --prefix=/usr/local
 perl Makefile.PL PREFIX=/usr/local

• ExtUtils-MakeMaker-6.64: needed perl-dev installed.  Updated get_alpine_deps.sh.  make test needed fakethr.h, sudo touch /usr/lib/perl5/core_perl/CORE/fakethr.h; same for sudo touch /usr/lib/perl5/core_perl/CORE/perlsfio.h
• LRDF-0.5.1-rg
• XML-Parser-2.41
• XML-Simple-2.22: needed perl-xml-namespacesupport and perl-xml-sax, perl-xml-sax-base installed.  Updated get_alpine_deps.sh
• aubio-0.3.2
• gtk-doc-1.21: needed docbook-xsl installed, Updated get_alpine_deps.sh
• gtk-engines-2.21.0
• jpeg-9a
• libart_lgpl-2.3.21
• libiconv-1.14: edited srclib/stdio.h to comment out _GL_WARN_ON_USE (gets, "gets is a security hole - use fgets instead");
• liblo-0.28
• lilv-0.24.3: needs lv2, serd, sord installed
• lv2-1.14.0: install before lilv
• nss-3.25: export NSPR_INCLUDE_DIR=/usr/local/include/nspr for nss after installing nspr
• nss-pem-1.0.2
• rdflib-4.1.2: sudo python setup.py install
• rubberband-1.8.1: needs vamp sdk installed, needs ladspa-dev installed.  Updated get_alpine_deps.sh
• serd-0.29.2: install before lilv
• sord-0.16.1: install before lilv
• sratom-0.6.0: install before lilv
• suil-0.10.0
• vamp-plugin-sdk-2.5: install before rubberband

Reboot: Alpine Linux and Ardour 5.12

Alpine Linux has a Raspberry Pi distribution with a modern kernel (4.14.52).  I installed this on a 32GB SD card and will be compiling and running Ardour 5.12 on this using the Cirrus Logic Audio Card which appears to be unavailable since 2016.   Perhaps the Blokas PiSound would work even better.

Installing Alpine Linux was not hard, following the Classic installation instructions.  To get the Cirrus Logic Audio Card driver working, the device tree overlay for wm5102 needs to be loaded.  There also is a modprobe dependency, put this in /etc/modprobe.d/cirrus.conf

softdep arizona-spi pre: arizona-ldo1

The file  /media/mmcblk0p1/config.txt needs to have the overlay added:
head /media/mmcblk0p1/config.txt
disable_splash=1
boot_delay=0
dtoverlay=vc4-kms-v3d
dtoverlay=rpi-cirrus-wm5102
dtoverlay=pi3-disable-bt
gpu_mem=256
gpu_mem_256=64

This successfully adds the device tree overlay at boot and loads the appropriate modules.

dmesg | tail -19

[ 2271.440909] snd-rpi-cirrus soc:sound: ASoC: CODEC DAI wm5102-aif1 not registered - will retry

[ 2271.444327] wm8804 1-003b: revision E

[ 2271.445857] snd-rpi-cirrus soc:sound: ASoC: CODEC DAI wm5102-aif1 not registered - will retry

[ 2271.483599] arizona spi0.1: Failed to get mclk1: -2

[ 2271.483615] arizona spi0.1: Failed to get mclk2: -2

[ 2271.483939] LDO1: supplied by RPi-Cirrus 1v8

[ 2271.484938] snd-rpi-cirrus soc:sound: ASoC: CODEC DAI wm5102-aif1 not registered - will retry

[ 2271.492410] arizona spi0.1: WM5102 revision C

[ 2271.520832] MICVDD: supplied by RPi-Cirrus 1v8

[ 2271.521795] Adding alias for supply MICVDD,(null) -> MICVDD,spi0.1

[ 2271.522102] Adding alias for supply MICVDD,(null) -> MICVDD,spi0.1

[ 2271.522109] Adding alias for supply DBVDD2,(null) -> DBVDD2,spi0.1

[ 2271.522115] Adding alias for supply DBVDD3,(null) -> DBVDD3,spi0.1

[ 2271.522121] Adding alias for supply CPVDD,(null) -> CPVDD,spi0.1

[ 2271.522130] Adding alias for supply SPKVDDL,(null) -> SPKVDDL,spi0.1

[ 2271.522144] Adding alias for supply SPKVDDR,(null) -> SPKVDDR,spi0.1

[ 2271.523659] snd-rpi-cirrus soc:sound: ASoC: CODEC DAI wm5102-aif1 not registered - will retry

[ 2271.553689] snd-rpi-cirrus soc:sound: ASoC: CODEC DAI wm5102-aif1 not registered - will retry

[ 2271.681956] snd-rpi-cirrus soc:sound: wm5102-aif1 <-> 3f203000.i2s mapping ok

aplay -l

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

card 0: RPiCirrus [RPi-Cirrus], device 0: WM5102 AiFi wm5102-aif1-0 []

  Subdevices: 1/1

  Subdevice #0: subdevice #0

lsmod

Module                  Size  Used by

snd_soc_wm5102        385024  1

snd_soc_wm_adsp        40960  1 snd_soc_wm5102

gpio_arizona           16384  0

snd_soc_arizona        45056  1 snd_soc_wm5102

arizona_micsupp        16384  1

arizona_spi            16384  0

arizona_ldo1           16384  1

snd_soc_wm8804_i2c     16384  1

snd_soc_rpi_cirrus     20480  0

snd_soc_wm8804         16384  1 snd_soc_wm8804_i2c

snd_soc_bcm2835_i2s    16384  2

snd_soc_core          180224  7 snd_soc_wm8804,snd_soc_rpi_cirrus,snd_soc_wm5102,arizona_micsupp,snd_soc_bcm2835_i2s,snd_soc_arizona,snd_soc_wm_adsp

snd_compress           20480  2 snd_soc_core,snd_soc_wm_adsp

snd_pcm_dmaengine      16384  1 snd_soc_core

snd_pcm                94208  6 snd_soc_wm8804,snd_soc_rpi_cirrus,snd_pcm_dmaengine,snd_soc_bcm2835_i2s,snd_soc_arizona,snd_soc_core

spi_bcm2835            16384  0

snd_timer              32768  1 snd_pcm

i2c_bcm2835            16384  0

snd                    65536  5 snd_compress,snd_soc_rpi_cirrus,snd_timer,snd_soc_core,snd_pcm
...

The modprobe.d file can be found on my audiopi gitlab repository.