evdev-joystick - Online Linux Manual PageSection : 1
Updated : Apr 19, 2016
Source : evdev-joystick
NAMEevdev−joystick − joystick calibration program
SYNOPSISevdev−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>]
DESCRIPTIONevdev−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.
CALIBRATIONUsing 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 ALSOffset(1), jstest(1).
AUTHORSevdev−joystick was written by Stephen Anthony, based on VDrift's G25manage tool. This manual page was written by Stephen Kitt <steve@sk2.org>. 0
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