Re: full-duplex - is it possible with rme32?

[Martin Langer <martin-langer@gmx.de>]

On Mon, May 06, 2002 at 11:48:33PM +0200, Martin Langer wrote:
> On Fri, May 03, 2002 at 02:55:23PM +0200, Takashi Iwai wrote:
> > At Thu, 2 May 2002 23:44:00 +0200, Martin Langer wrote:
> > > 
> > > the RME Digi 32 in half-duplex is working so far, but I don't see a solution
> > > for a full-duplex support, because this card is working with one buffer for
> > > recording and playing.
> > > 
> > > A driver should write the playing data and read the recording data in one
> > > cycle at the same address. There is no way to separate play/rec. It's just
> > > working in a synchronized way: first get the rec-data and then overwrite it
> > > with play-data, cycle for cycle,...
> > 
> > does the capture sample always overwrite the sample to be played?
> > i.e. if the hardware sequence is
> > 	capture -> playback
> > on the same pointer, then i have no idea how to do full duplex at
> > all.  but if the hardware does
> > 	playback -> capture
> > then there must be no problem.
> > 
> 
> I'm not sure about my card. In the description I see both cases and I
> don't know the right one (or the mistake) up to now.
> 

I asked RME about the real behaviour and the answer was something like this:
The sample for playing is the first one in the buffer. Capturing at the same
time will overwrite this sample...

So we have the hardware sequence: capture -> playback
and this is like "good-bye full duplex!" for the rme32.


martin


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