[alsa-devel] Query regarding sampling rates etc

[Pharaoh .]

On 7/11/07, dustin at seznam.cz <dustin at seznam.cz> wrote:
>
> Exactly, this sounds like when I was sending left-aligned serial audio
> instead of I2S format from ice1724 to the codec. Low volumes were OK, higner
> distorted.
>
> Pavel.
>
> >  ------------ Původní zpráva ------------
> >  Od: Liam Girdwood <lg at opensource.wolfsonmicro.com>
> >  Předmět: Re: [alsa-devel] Query regarding sampling rates etc
> >  Datum: 10.7.2007 23:18:21
> >  ----------------------------------------
> >  On Tue, 2007-07-10 at 19:32 +0530, Pharaoh . wrote:
> >  > Hi,
> >  > This is a very vague question, just thought of asking it after hours
> of
> >  > debugging.
> >  >
> >  > I am testing my alsa driver, written for omap 730/850 based board. I
> am
> >  > testing it by using aplay.
> >  >
> >  > Despite checking clocks, sampling rates etc many times and after
> doing many
> >  > combinations thereof, I cant hear anything more than a noise which
> changes
> >  > and becomes more like the original .wav file as I change various
> params like
> >  > sampling rates/clocks etc. It becomes close to the actual thing, but
> not
> >  > better.
> >  >
> >  > Any idea what are the params I should be tweaking? I know this is h/w
> >  > dependent.
> >  >
> >
> >  Sounds like (no pun intended) your digital audio interface is not set
> up
> >  correctly between your codec and CPU.  It's probably best to make sure
> >  they are both using the same I2S or PCM modes.
> >
> >  Liam
> >
> >  _______________________________________________
> >  Alsa-devel mailing list
> >  Alsa-devel at alsa-project.org
> >  http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
> >
> >
> >
>
Okay, got it. But in this case wont the data on i2s line get corrupted?
I could see correct data being passed on i2s data line, I tried with some
unique patterns and the 2's compliment was visible on the data line.