[Libff-devel] Re: Vegastrike and Force Feedback

[Alexander R. <ale...@us...>]

Hi,

On Sunday 03 March 2002 23:47, you wrote:
> >
> > I mean this seems like the most basic possible...can I just fopen
> > (/dev/jsX) and write some stuff tehre for forces...can you tell me how to
> > do this? or is the timing important and are otehr things important...... 
> > low level is ok since right now all I need is 1 function:
> >
> > void ApplyForce (x,y,z);
> > that's both direction and magnitude....
> > is that difficult to implement in low level...?
>
> No, it's only one ioctl. Have a look at the utility called ffmvforce
> (available on my homepage or at linuxconsole.sourceforge.net).
>
> The API is described in Documentation/input/ff.txt in the patched linux
> sources.
> Briefly:
> 1. You create/update effects using ioctls on /dev/input/eventX
> 2. You play/stop effects by writing into /dev/input/eventX
> 3. You query device features by... guess what ? ioctls on /dev/input/eventX
> (4. /dev/input/eventX is handled by the module called evdev.o)
>
> /dev/input/jsX isn't actually necessary. But you can use it too if you
> want.

I've read it and I think I understand how it is done.


Alex

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                   Alexander Rawass
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