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jscal(1)										 jscal(1)

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 cali-
	      brated,  3  if  buttons were pressed, 1 if there was any other error, and 0 on suc-
	      cess.

       -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 com-
	      mand 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 annoy-
       ingly 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).

jscal					   Jul 11, 2010 				 jscal(1)
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