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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4CC1B7CD.3030703@ladisch.de \
--to=clemens@ladisch.de \
--cc=alsa-devel@alsa-project.org \
--cc=patrick.ziegler@fh-kl.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox