jscal(1)						      General Commands Manual							  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 cor-
       rectly 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 informa-
       tion 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)