evdev-joystick - joystick calibration program

NAME  SYNOPSIS  DESCRIPTION  OPTIONS  CALIBRATION  SEE ALSO  AUTHORS 

NAME

evdev−joystick − joystick calibration program

SYNOPSIS

evdev−joystick −−help
evdev−joystick −−listdevs
evdev−joystick −−showcal
<device-path>
evdev−joystick −−evdev
device-path> [−−axis <axis>] [−−minimum <value>] [−−maximum <value>] [−−deadzone <value>] [−−fuzz <value>]

DESCRIPTION

evdev−joystick calibrates joysticks. Calibrating a joystick ensures the positions on the various axes are correctly interpreted.

OPTIONS

−−h, −−help

Print out a summary of available options.

−−l, −−listdevs

List all joystick devices found.

−−s, −−showcal <device-path>

Show the current calibration for the specified device.

−−e, −−evdev <device-path>

Specify the joystick device to modify.

−−a, −−axis <axis>

Specify the axis to modify (by default, all axes are calibrated).

−−m, −−minimum <value>

Change the minimum for the current joystick.

−−M, −−maximum <value>

Change the maximum for the current joystick.

−−d, −−deadzone <value>

Change the deadzone for the current joystick.

−−f, −−fuzz <value>

Change the fuzz for the current joystick.

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).

AUTHORS

evdev−joystick was written by Stephen Anthony, based on VDrift’s G25manage tool.

This manual page was written by Stephen Kitt <[email protected]>.


Updated 2024-01-29 - jenkler.se | uex.se