[alsa-devel] usbaudio: Support for USB audio v2.0 devices

Daniel Mack daniel at caiaq.de
Tue Apr 27 16:06:12 CEST 2010

On Tue, Apr 27, 2010 at 04:23:48PM +0300, adelias wrote:
> On 2/3/2010 8:35 μμ, Daniel Mack wrote:
> > On Tue, Mar 02, 2010 at 11:13:04AM +0200, adelias wrote:
> >> Thanks to all involved for working on usb audio v2.
> >>
> >> Last night I installed the 20100226 snapshot. I did a little testing
> >> with my XMOS board using toslink out into may DAC. I tried various files
> >> ranging 16bit/44110kHz-24bit/192000kHz. The 44110 files had quite a bit
> >> of static, the higher bitrate files were better. As you stated the
> >> sampling rate is not correct and be verified by looking at the flashing
> >> LEDs on the XMOS board. They should flash faster as sampling rate
> >> increase. In this case no change was observed.
> >
> > Yes - this is all do be done. The sample rate setting is done with a
> > different type of class request, which also addresses the interface now,
> > unlike v1 devices which send that to the endpoint. But that's just one
> > out of many differences that need to be addressed, and it's still a long
> > way to go. I'm on it :)
> >
> > Daniel
> I upgraded alsa to 1.0.23. The XMOS device is working great with the 
> exception of some mild clicks here and there. Is this a known issue or
> might it be a problem with my specific configuration?

What specific configuration are you testing with? As you have such an
evaluation kit, I believe you're also provided with the XMOS development
platform - which firmware did you install to the board?


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