[alsa-devel] Enabling SPDIF output on Turtle Beach Audio Advantage Micro (CMEDIA CM102S)
sandeen at sandeen.net
Wed Mar 28 16:30:57 CEST 2007
I have this Turtle Beach Audio Advantage Micro usb sound card, er,
stick. Inside it has pretty much nothing but a C-Media CM102S chip. TB
claims, as does C-Media, that it can do S/PDIF out, and I believe them
based on the glowing red TOSLINK light. :)
I found previous emails on this list
suggesting that there is probably some magic to be applied to tell usb
hardware to go into S/PDIF mode.
I've captured some traces under windows, linked from
Specifically, http://sandeen.net/tbaam/2spkr-spdif.txt seems to be a
fairly short burst of USB activity when I used the control panel to
switch from 2 speaker mode to spdif mode. I see the exact same activity
when switching from headphone mode to spdif mode. Strangely, switching
from, say, spdif back to 2 speaker seems to generate a lot more traffic.
The full annotated trace is here: http://sandeen.net/tbaam/usbsnoop1.txt
In any case, are these traces helpful to anyone who understands how to
talk to a C-Media CM102S usb sound card? Does it look possible to poke
this hardware into S/PDIF mode with this information?
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