[alsa-devel] [PATCH V2] Add i.MX sound support

Sascha Hauer s.hauer at pengutronix.de
Mon Nov 30 13:43:05 CET 2009

On Mon, Nov 30, 2009 at 11:43:23AM +0100, javier Martin wrote:
> Hi Sascha,
> have you tested capture direction on an i.MX27 based board?
> I have been testing your patches in the place you suggested and playback
> seems to work fine but I have several problems with capture stream. I found
> a BUG in the audmux_v1 code
> and I have fixed it but I am still having problems with capture. The file
> keeps empty and nothing is recorded.

Capture works fine on my boards.

> Please could you try the following on an i.MX27 based board?
> arecord -t raw -c 1 -f S16_LE test.wav

Does it work with two channels? Do you use DMA or FIQ? Could you try the
other variant?

It helped me a lot during development to use a tool like memedit
(http://www.pengutronix.de/software/memedit/index_en.html) to show a
register dump of the SSI/Audmux units of a working setup and a non
working setup. Usually the differences showed quite fast why one was
working and the other was not.


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