jscal(1)

NAME

   jscal - joystick calibration and remapping program

SYNOPSIS

   jscal [options] <devicename>

DESCRIPTION

   jscal   calibrates  joysticks  and  maps  joystick  axes  and  buttons.
   Calibrating a joystick ensures the positions on the  various  axes  are
   correctly interpreted.  Mapping axes and buttons allows the meanings of
   the joystick's axes and buttons to be redefined.

   On Debian systems the calibration settings  can  be  stored  and  later
   applied automatically using the jscal-store command.

OPTIONS

   -c, --calibrate
          Calibrate the joystick.

   -h, --help
          Print out a summary of available options.

   -s, --set-correction <nb_axes,type,precision,coefficients,...>
          Sets correction to specified values.  For each axis, specify the
          correction  type  (0  for  none,  1  for  "broken  line"),   the
          precision, and if necessary the correction coefficients ("broken
          line" corrections take four coefficients).

   -u,                                                      --set-mappings
   <nb_axes,axmap1,axmap2,...,nb_buttons,btnmap1,btnmap2,...>
          Sets  axis and button mappings.  n_of_buttons can be set to 0 to
          remap axes only.

   -t, --test-center
          Tests if the joystick is correctly calibrated.  Returns 2 if the
          axes  are  not calibrated, 3 if buttons were pressed, 1 if there
          was any other error, and 0 on success.

   -V, --version
          Prints the version numbers of the running  joystick  driver  and
          that which jscal was compiled for.

   -p, --print-correction
          Prints  the  current  correction  settings.   The  format of the
          output is a jscal command line.

   -q, --print-mappings
          Prints the current axis and button mappings.  The format of  the
          output is a jscal command line.

CALIBRATION

   Using  the Linux input system, joysticks are expected to produce values
   between -32767 and 32767 for axes,  with  0  meaning  the  joystick  is
   centred.   Thus,  fullleft  should produce -32767 on the X axis, full
   right 32767 on the X axis, fullforward -32767 on the Y  axis,  and  so
   on.

   Many  joysticks  and gamepads (especially older ones) are slightly mis
   aligned; as a result they may not use the full range of values (for the
   extremes  of  the  axes),  or  more annoyingly they may not give 0 when
   centred.  Calibrating a joystick provides the kernel  with  information
   on  a  joystick's  real  behaviour,  which allows the kernel to correct
   various joysticks' deficiencies and produce consistent output as far as
   joystickusing software is concerned.

   jstest(1) is useful to determine whether a joystick is calibrated: when
   run, it should produce all 0s when the joystick is at  rest,  and  each
   axis  should  be  able  to produce the values -32767 and 32767.  Analog
   joysticks should produce values in between 0 and the extremes, but this
   is  not  necessary;  digital  directional  pads work fine with only the
   three values.

SEE ALSO

   ffset(1), jstest(1), jscal-store(1).

AUTHORS

   jscal was written by Vojtech Pavlik and improved by  many  others;  see
   the linuxconsole tools documentation for details.

   This  manual  page was written by Stephen Kitt <[email protected]>, for the
   Debian GNU/Linux system (but may be used by others).

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