About OpenMoko Rotate

Fox Mulder Quakeman1 at gmx.net
Sat Sep 20 10:54:27 CEST 2008

This is not so easy to do. The rotation comes out of a calculation of
the values from acceleration sensors. There are no "angle" sensors for
this operation. So there is no way of exactly say which angle the neo
currently has instead these are just aproximations.


Vasco Névoa wrote:
> That's very cool. I appreciate the mod. :)
> I'm seeing something that looks like a bug (in both versions)... but I'm 
> not sure if the accelerometers require calibration or something.
> With the FR in vertical position, if I tilt it counter-clockwise, it 
> takes just over 90 degrees to get 'accel-rotate' to change the 
> orientation; but if I tilt it even less than 10 degrees clockwise after 
> that, it reverts back to the original orientation.
> Shouldn't the threshold be set at the midpoint angles (45, 135, 225, 315 
> degrees)?
> Anyway, good work to both coders, it's just what I wanted. :D
> Maybe someone cares to extend this simple app to use some kind of sexy 
> morph instead of the disruptive xrandr rotation? 8-)
> Rui Miguel Silva Seabra wrote:
>> Done. I've added a reference to it at http://wiki.openmoko.org/wiki/Rotate
>> but my page about it is at
>> http://blog.1407.org/2008/09/20/openmoko-rotate-now-using-libxrandr/
>> Users of Rotate, I've patched it so it doesn't use system+xrandr but
>> simply call directly the xrandr function using libxrandr.
>> This means:
>>  * quicker
>>  * less battery consumption
>> Best,
>> Rui
>> On Fri, Sep 19, 2008 at 10:13:29AM +0100, Rui Miguel Silva Seabra wrote:
>>> Hi,
>>> I'm preparing a patch for using xrandr api directly in Rotate instead of
>>> system(). It's almost done but I can only code it at home time (which, for
>>> me, starts again in about 9 hours) :)
>>> This will be much better in terms of speed and battery life!
>>> Best,
>>> Rui
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