[LAD] USB audio on RPi3B+

[Christopher Obbard]

Hi Fons,

Are you using a RT kernel at all?
Onboard i2s soundcards sound like a better option for multichannel, alas
the RPi only does 2 channels... unless you do some voodoo like transmitting
256 bits over two channels with a hardware divider... similar to how a
certain multichannel card does it ;-)



Cheers!

Chris Obbard
64 Studio Ltd

On Sat, 7 Jul 2018 at 16:48, Fons Adriaensen <fons at linuxaudio.org> wrote:

> Hello all,
>
> Has anyone tried using multichannel USB audio on a Raspberry 3B+ ?
>
> It seems to work perfectly (using zita-alsa-pcmi) with stereo cards.
>
> When I try my RME Babyface (12 in, 12 out) in CC mode, the device
> opens without problems, but then Alsa_pcmi::pcm_wait() times out
> waiting for the poll fd to become ready. Timeout in pcm_wait() is
> 1000 milliseconds.
>
> The same seems to happen with Jackd, which uses similar code.
>
> Is there anything in the Pi's system or configuration that
> excludes multichannel cards ?
>
> Ciao,
>
> --
> FA
>
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> Linux-audio-dev at lists.linuxaudio.org
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>
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