Re: GPIO connections for the M-Audio Revolution 5.1

[Takashi Iwai <tiwai@suse.de>]

At Mon, 7 Aug 2006 21:31:14 +0100,
Jochen Voss wrote:
> 
> Hello,
> 
> last week I reported bug #2325: capturing sound on the M-Audio
> Revolution 5.1 does not work.  While trying to figure out the
> cause of the problem, I encountered the following question:
> 
> What are the GPIO pins of the Envy24GT connected to for this card?
> Since there is already a driver, somebody will probably have figured
> this out, but I could not find documented anywhere.

The document for 7.1 was not publicly released.  And no known document
for 5.1.  You should ask M-Audio about it.

> What I did find out:
> 
> 1) The ice1712/revo.h header file (shared by Revolution 7.1 and 5.1)
> defines the following:
> 
> #define VT1724_REVO_CCLK	0x02
> #define VT1724_REVO_CDIN	0x04	/* not used */
> #define VT1724_REVO_CDOUT	0x08
> #define VT1724_REVO_CS0		0x10	/* not used */
> #define VT1724_REVO_CS1		0x20	/* front AKM4381 chipselect */
> #define VT1724_REVO_CS2		0x40	/* surround AKM4355 chipselect */
> #define VT1724_REVO_MUTE	(1<<22)	/* 0 = all mute, 1 = normal operation */
> 
> Why are the "not used" ones there?

Why not? :)

> 2) From visual inspection of the card (a photo is at
> http://seehuhn.de/comp/hardware/revoboard.jpg ) I think that the
> following GPIO pins are connected to something:
> 
>     0x01 (seems to go to the PCI bus)
>     0x02
>     0x04
>     0x20
>     0x40
>     0x80
>     (1<<22)
> 
> Note that 0x80 is not mentioned in the header file.  Is this a
> problem?

Might be.  The code was originally written for Revo 7.1, and I have no
revo 5.1.  Just heard that it works so.

> 3) I think that AK4381 and AK4355 as mentioned in the header file are
> DACs.  The Revolution 5.1 has only one DAC (an AK4358), not two.
> Could this cause problems?

Not probablly but possible although the capture is likely dependent
only on the ADC connection.

Actually, it's a shot in the dark.  No-one can answer this kind of
question correctly except for M-Audio guys...


Takashi

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