From: Clemens Ladisch <clemens@ladisch.de>
To: Patrick Ziegler <patrick.ziegler@fh-kl.de>
Cc: alsa-devel@alsa-project.org
Subject: Re: SoC Atmel SSC stereo problem
Date: Fri, 22 Oct 2010 18:11:57 +0200 [thread overview]
Message-ID: <4CC1B7CD.3030703@ladisch.de> (raw)
In-Reply-To: <4CC1AB01.3020603@fh-kl.de>
Patrick Ziegler wrote:
> I have some trouble with stereo audio through the atmal ssc interface
> based on at91-ssc.c.
(Merged into atmel_ssc_dai.c since about one year ago.)
> Unfortunately left and right channels were swapped periodically.
>
> In my environment the codec supplies the BLCK and LRC clocks and
> the SSC is configured to transmit one sample on both edges of the LRC clock.
> But I guess the audio frames will always start with a frame of the left channel
> while the LRC clock is in an undefined state.
Indeed.
> How does normally the audio driver detect when a left and when a right channel
> frame should be send and with which it should start ?
The driver cannot do anything about this; the hardware must be told
to start transmitting at the falling edge.
If possible.
Is there a reason why the codec supplies LRC?
Regards,
Clemens
next prev parent reply other threads:[~2010-10-22 16:10 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-22 15:17 SoC Atmel SSC stereo problem Patrick Ziegler
2010-10-22 16:11 ` Clemens Ladisch [this message]
2010-10-22 21:39 ` Patrick Ziegler
2010-10-23 4:10 ` Alex
2010-10-25 9:16 ` Patrick Ziegler
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