Re: GPIO connections for the M-Audio Revolution 5.1

[Takashi Iwai <tiwai@suse.de>]

At Tue, 8 Aug 2006 12:40:33 +0100,
Jochen Voss wrote:
> 
> Hi Takashi,
> 
> On Tue, Aug 08, 2006 at 01:23:27PM +0200, Takashi Iwai wrote:
> > > AK5365, according to the spec (page 21) this one has volume control.
> > > Maybe recording is just a matter of putting the volume up on this
> > > chip?
> > 
> > Ah, then 0x80 makes sense.  It's possibly a chip-select for that ADC
> > chip.
> 
> I took out the card and had another look.  I don't have any measuring
> equipment, so I am limited to staring at the board.  It might be, that
> GPIO pin 0x80 is connected to pin 33 (CSN/CAD1) of the AK5365.  Would
> this make sense?

Yes.

> Do you know whether the card uses 3-wire control or I2C?

My rough guess is 3-wire control, using the same CLK (0x02) and CIN
(0x04) with a different CS (0x80).  Or possibly CS0 (0x10) or CS2
(0x40) is used instead.  Currently the driver resets all CS0-2 bits
for a single AK4358 chip, but only one of them should be needed.


Takashi

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