Re: [Plib-devel] Saitek X52 joystick with 34 buttons

[Bram S. <br...@sa...>]

Trammell Hudson wrote:
> I've recently started using a Saitek X52 joystick with my Linux box and
> have run into problems with plib's JS module limitation in the number
> of supported buttons.  It only supports up to 32 buttons due to the
> MAX_BUTTONS definition and the fact that it uses an int to store the
> button state, but the X52 has 34 buttons (and 12 axes).  This code in
> jsLinux.cxx is the problem:

Hi Trammell!

I'll be happy to commit your changes to CVS.
However, before I do that, I need to check for portability.

jsLinux.cxx is pretty safe to adapt.
However, js.h is cross-platform, and I wonder about the
portability of uint64_t. Do all plib platforms know uint64_t ?

It seems to be defined by stdint.h, which is included
in inttypes.h

This is something I found with google on the subject
of inttypes (which seems incompatible with Nec SX-5 super computers ;-)
In the email thread, a lack of standardization is mentioned.

http://www.cactuscode.org/pipermail/developers/2004-September/000608.html

So... what to do?

   Bram Stolk

> 
>       case JS_EVENT_BUTTON :
>         if ( os->js.value == 0 ) /* clear the flag */
>           os->tmp_buttons &= ~(1 << os->js.number) ;
>         else
>           os->tmp_buttons |=  (1 << os->js.number) ;
>         break ;
> 
> Changing tmp_buttons to a uint64_t, updating the arguments to
> jsJoystick::rawRead and jsJoystick::read fixed that for me.
> 
> Another problem is that the mode switch holds down one of three
> buttons depending on which of the three modes is selected. This
> interferes with the calibration routine used by FlightGear and
> required me to modify the fgjs program.  Any code that uses
> level triggered button handling may run into starvation as it
> always services the mode buttons.
> 
> With FC3 I had to patch my kernel's USB hid-core file, as documented
> here to deal with the slow joystick device.  Apparently Saitek has some
> problems across their entire product line -- the patch was originally
> for an X45 joystick, but works for the X52 as well:
> 
>   http://baron.flightgear.org/pipermail/flightgear-users/2004-July/008234.html
> 
> Trammell
> 
> 
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