Joerg Reisenweber joerg at openmoko.org
Tue Apr 14 08:24:20 CEST 2009

Am Di  14. April 2009 schrieb NeilBrown:
> On Tue, April 14, 2009 1:16 pm, Steve Mosher wrote:
> >
> > Werner Almesberger wrote:
> >> - remove one of the acceleration meters (useless)
> >        yes. I puzzled over having two to begin with. The stated purpose
> >        was just plain math BS.
> It was something about being able to detect rotation around an internal
> axis wasn't it?  I suspect someone could find a use for that, but I cannot
> see it as a big-ticket item.
> Far more important to me is having whatever accelerometers there are wired
> up properly.  The two in the GTA02 have 2 interrupt lines each. In the
> A06, only one each is connected,

You don't need two.

> and of those, only one is usable to 
> wake-from-suspend. 
> So I cannot program the GTA02 to wake on either 
> a shake or an double-tap,

Double tap isn't possible to configure for a wake source, no  matter how you 
connect the interrut lines.

> and these have to be programmed on different  
> interrupt lines.

Basically there's virtually no reasonable usecase for two gmeters each of 
which can create a wake.

> In my mind, getting this sort of thing right is really important for
> Openmoko because you deliberately want people to do unexpected things
> with it.  When we find things don't work in a perfectly general way it
> stifles innovation.
> I've been trying to figure out where I - a software guy with minimal
> electronics and zero acoustic knowledge - could contribute to a project
> like this.  One area might be in reviewing a detailed design to look for
> details like this:
>   - accelerometer interrupt lines not routed optimally

see above

>   - AUX button cannot wake from suspend (Though I don't know why this
>         is the case for GTA02 yet...)

It's a tradeoff as we would need additional circuitry to make wake-from-AUX 

>   - AUX LED draws too much current


>   - console UART mux with GSM caused more awkwardness than if it had
>     been muxed e.g. with GPS

It's not muxed at all in GTA02

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