[Alsa-user] Atmel SoC duplexing know-how

[Preston <pk...@gm...>]

Hello to all,

I am in the midst of attempting duplex audio (capture and playback) on an Atmel
9260 board with a dumb codec attached, Linux-2.6.28.8.  I must first state that
I am completely new to ALSA and audio development in general, let alone on an
embedded level, but have learned a great deal from reading.  I am fortunate
enough to have a working driver for the codec and have aplay and arecord
functioning well with it, but am at a point where I do not know how to work with
duplex audio.  I have done a great deal of reading on the asym plugin but quite
frankly feel like I'm missing something.  

my test software is able to control capture and playback streams easily enough
(half-duplex essentially), but opening a duplex style stream just doesn't seem
as straight forward as snd_pcm_open(stream stuff....).  Has anybody worked with
duplexing the streams using the asym alsa plugin?  I would appreciate any help
in direction in this matter, and unfortunately since I'm so new to ALSA, I don't
even know the proper way to ask my questions.  So in short, I need to setup a
duplexed stream (or a method of having capture and playback open at the same
time on the same sound card) that I can write and read to from software.

I'm sure I left out plenty of information and didn't want to crowd the post with
code, so if there is specific information that is needed please let me know.

Thanks 

  Preston