NeilBrown neilb at suse.de
Tue Apr 14 06:35:17 CEST 2009

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, 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, and these have to be programmed on different
interrupt lines.
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
  - AUX button cannot wake from suspend (Though I don't know why this
        is the case for GTA02 yet...)
  - AUX LED draws too much current
  - console UART mux with GSM caused more awkwardness than if it had
    been muxed e.g. with GPS
that could be improved.  Whether I would have found any of those I don't
know, but it would have been fun to try:-)
That would, of course, require complete and uptodate details of the
proposed hardware.  I wonder how practical that would be....


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