[alsa-devel] trouble with alsa, wolfson, and TI OMAP35xx McBSP

Alejandro Blanca G. alex.blanca at gmail.com
Thu Apr 23 18:50:25 CEST 2009

Hi everyone.

We are working with bringing up another audio codec with the Beagle Board.

Probably the issue we are seeing is related: we are having problems
when doing playback and observe that the information corresponding to
2 channels is being sent only through the left channel. We might have
some other problems too, since we are new to this kind of development,
but maybe our observations or yours could be useful to stabilize the
Beagle platform code.

Best regards,

Alex B.

On Thu, Apr 23, 2009 at 4:20 AM, Peter Ujfalusi
<peter.ujfalusi at nokia.com> wrote:
> On Wednesday 22 April 2009 20:58:01 ext twebb wrote:
>> Problem 2:
>> Test tone is being presented by the user application, providing a 1Khz
>> tone sampled at 44.1Khz. The data are S16_LE, right channel only. Left
>> channel is quiet. The data seems to slip back and forth from left to
>> right channel. This is reproducable and verified with a scope trace.
>> Anybody have any ideas what might be going wrong here?  Traces for
>> codec reg dump and mcbsp are attached.
> As Jarkko already asked: are you seeing the channel switch while running or is
> it happens on playback start?
> AFAIK this phenomena can be also seen on Beagle board.
> I have done some investigation regarding to these, but so far I can not say
> that I know what causes it.
> BTW: these are separate issues (startup switch and runtime switch).
>> Thanks,
>> twebb
> --
> Péter
> --
> To unsubscribe from this list: send the line "unsubscribe linux-omap" in
> the body of a message to majordomo at vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

More information about the Alsa-devel mailing list