UDA134x full-duplex driver

Forum: Linux
Jack 
Hello,

I trying to use the UDA134x in full-duplex mode. I mean using the following
command

    fd=open("/dev/dsp", O_RDWR|O_NONBLOCK);

When try to open device in ReadWrite Mode an error message occurs. But it
works well in ReadOnly mode, works well in WriteOnly. But not in RW mode. 

Is it due to a "bug" in the driver or is it due to the UDA134x hardware
features ? Has anyone already test it ?

Thanks

Jack 
Still no answer ?

Am I the only person in this planet who want to access to audio device in
ReadWrite mode ?

Can anyone help ...

Thanks

open-nandra 
Could be more specific with error message? Maybe this could help:
http://www.oreilly.de/catalog/multilinux/excerpt/ch14-05.htm (sample at the
end)

MArcio Lima 
Hi

You cannot open the device in read/write mode. You have to open in read
only mode or write only mode.

fd=open("/dev/dsp", O_RDONLY|O_NONBLOCK);

This is a constrain of the ALSA device driver.

Jack 
Effectively, It works fine in READ only, also in WRITE only, but not both
in the same time.

I thought that the UDA1341 is a full duplex codec, I certainly must be
wrong :o(

So, If I well understand your comment there is noway to use it in full
duplex. 

Very bad news ...

Thanks again

Regards