Re: [Enigma-devel] TiltStick, USB based tilt sensor

[Till Harbaum / Lists]

Hi,

hmm, no feedback. Please let me explain why i am bothering you with this.
The sdl layer supports joysticks and the tiltstick is a joystick. Thus 
everything should be a no brainer.

Unfortunately there's some magic in the linux joystick driver (i never checked
if windows does the same) that extends the "death zone" of any joystick 
somewhat. This means that the range around zero of each axis is extended a 
little bit to make sure that a slightly miss-calibrated joystick doesn't 
permanently report tiny movements. Thus the joystick has to moved a 
significant amount before starting to report values != 0.

I have come up with an interface routine being able to access the linux input
event system directly and thus avoiding the joystick routines. This has 
several consequences:

a) the code only runs under linux (other OS may of course still use the 
joystick subsystem as a fall-back)
b) it requires a udev rule (in fact a simple text file in /dev/udev/rules.d) 
to give non-root users access to the event interface of the tiltstick
c) it only works for the tiltstick (or to say it in a positive way: it is able
to precisely select the tiltstick and not e.g. a regular joystick also 
attached)

What do you think? Would you be interested/willing to integrate something like
this into the official enigma version?

Regards,
   Till

Am Samstag 02 Februar 2008 schrieb Till Harbaum / Lists:
> Hi,
>
> i've built a tilt sensing device (see
> http://www.harbaum.org/till/tiltstick) which i'd really like to combine
> with enigma. The TiltStick emulates a simple two axis joystick and is
> working under linux and most other operating systems.
>
> I am especially looking forward to use this in conjunction with the Maemo
> port of enigma on my Nokia N800. But using the stick with a notebook
> computer or a tablet PC should give a similar experience.
>
> Regards,
>   Till
>
>
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