Re: [Gumstix-users] Audiostix and breakout-th

[Dominic J. E. <sa...@th...>]

On Thu, 10 Mar 2005, Craig Hughes wrote:

> > # aumix -q
> >  aumix:  SOUND_MIXER_READ_DEVMASK
>
> I've seen that before on some 'stix, and I don't know why.  But
> reflashing has fixed it in the past.  I think that the ucb1400 ac97
> driver I wrote doesn't report properly what mixer features it supports
> or something.  I'll fix that.

Which leads to the next interesting question - how do you reflash if you
don't have the tweener/waysmall/something else with a RS232 level serial
port? (See questio below :)

> Try reflashing.  The default volume should be 66 OSS units, which
> equates to about "6" on a 10-peg volume knob (or 6.6 if your volume
> goes all the way to 11).  Booting then immediately trying to madplay
> should work fine for headphones or external speakers set to a "normal"
> volume level.

If there's another way to reflash the gumstix (e.g. through usb) - let me
know..

> > Also - can I just wire up a serial cable to either the X4 pad on the
> > audiostix (the 2-3 pads in question), or onto the appropriate holes on
> > the
> > breakout-th, and hook the cable up to a pc - or does it need any extra
> > stuff inbetween? (I noticed some of the schematics have extra chips,
> > but I
> > didn't look that closely)
>
> X4 I believe provides logic-level signals, not RS232 level.  So you'll
> have to put them through a level shifter to work as a serial port.  You
> can copy the level-shifter part of the waysmall schematic to do that.

Hum, that should be easy enough.



 - d.

-- 
Dominic J. Eidson
                                        "Baruk Khazad! Khazad ai-menu!" - Gimli
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