[LAU] Raspberry PI, internal audio IF + testing new USB IF

[Carlos sanchiavedraz]

Hello dear all.

I'm testing a small interface for some musical and technological projects
which has an instrument input jack on one side and no audio output, just
USB on the other side. This IF works great but you have no physical audio
output to monitor/hear sound, so I thought I could enable internal audio IF
(as I've done on other devices) and that will be the audio output instead
of needing another second IF to get audio from.

So I decided to rescue some past investigations I made when first
researching about RPi, along with the great content generated by some dear
great folks in here, and some new research one after each problem.

First started from a Raspbian 2012 version which I had already tweaked for
a headless autojamming/instrument effects/looper, but got many issues
making step by step progresses that I briefly point here FWIW:

- Enabled internal IF on Raspbian 2012 [1]

- Found mmap problem regarding using Jackd with internal IF [2], even tried
a module somebody compiled

- Tried switching to the new platform version, Raspbian 2015 (raspberrypi
3.2.27+) but there wasn't even /proc/asound

- Couldn't get to load snd-bcm2835 kernel module for internal soundcard [4]

- Finally I got an error from the very raspi-config regarding internal
audio IF [5]

Although I continue researching, I guess somebody here has already gone
through some of this, but I'm wondering if it's already an abandoned thing
by the makers themselves this thing of the internal IF thing.

Thanks as always.
Greetings all.

+info:

[1] enable internal souncard on Raspbian 2012
https://duckduckgo.com/?q=%22raspberry+pi%22+enable+internal+soundcard&t=debian
http://www.raspberrypi.org/forums/viewtopic.php?f=66&t=18573
http://stackoverflow.com/questions/12144972/jack-audio-connection-kit-jackd-daemon-fails-to-start-on-raspberrypi

[2] enable mmap to run jack with internal soundcard on Raspbian 2012
https://martinezjavier.wordpress.com/2013/04/27/mmap-support-for-raspberry-pi-bcm2835-alsa-driver/
https://www.hifiberry.com/forums/topic/jackd/

[3] cat: /proc/asound: No such file or directory
https://duckduckgo.com/?q=%22cat%3A+%2Fproc%2Fasound%3A+No+such+file+or+directory%22&t=debian
http://forums.debian.net/viewtopic.php?t=74914
http://forum.ubuntu.ru/index.php?topic=99987.105
http://forums.debian.net/viewtopic.php?p=415341

[4] error when loading snd-bcm2835 kernel raspberrypi 3.2.27+ module for
internal soundcard on Raspbian 2015
https://duckduckgo.com/?q=%22libkmod%3A+ERROR+..%2Flibkmod%2Flibkmod.c%3A554+kmod_search_moddep%3A+could+not+open+moddep+file+%27%2Flib%2Fmodules%2F3.2.27%2B%2Fmodules.dep.bin%27%22&t=debian
http://www.raspberrypi.org/forums/viewtopic.php?f=44&t=36445&p=305808

[5] error raspi-config when enabling audio via minijack on Raspbian 2015
https://duckduckgo.com/?q=raspberry+pi+%22there+was+an+error+running+option+A9+audio%22&t=debian
http://www.hifiwigwam.com/showthread.php?115856-Raspberry-Pi-2/page3

-- 

C. sanchiavedraZ:
* NEW / NUEVO:     www.sanchiavedraZ.com
* Musix GNU+Linux: www.musix.es
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