NAME

       jscal - joystick calibration and remapping program

SYNOPSIS

       jscal [options] <device‐name>

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,  full‐left  should  produce
       -32767  on  the X axis, full‐right 32767 on the X axis, full‐forward -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  joystick‐using
       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 <steve@sk2.org>,  for  the  Debian  GNU/Linux
       system (but may be used by others).