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JOY (4) | Special files and drivers | Unix Manual Pages | :man

NAME

joy - joystick device driver

CONTENTS

Synopsis
Description
One line perl example:
Technical Specifications
Files
History
Authors

SYNOPSIS

To link into the kernel:
.Cd device joy

To load as a kernel loadable module:

kldload joy

In /boot/device.hints:
.Cd hint.joy.0.at= "isa"
.Cd hint.joy.0.port= "0x201"


.In sys/joystick.h

DESCRIPTION

The joystick device driver allows applications to read the status of the PC joystick.

This device may be opened by only one process at a time.

The joystick status is read from a structure via a read() call. The structure is defined in the header file as follows:


struct joystick {
int x; /* x position */
int y; /* y position */
int b1; /* button 1 status */
int b2; /* button 2 status */
};

Positions are typically in the range 0-2000.

One line perl example:


perl -e ’open(JOY,"/dev/joy0")||die;while(1)
{sysread(JOY,$x,16);@j=unpack("iiii",$x);print "@j\n";sleep(1);}’

ioctl calls

Several ioctl() calls are also available. They take an argument of type int *
JOY_SETTIMEOUT int *limit
Set the time limit (in microseconds) for reading the joystick status. Setting a value too small may prevent to get correct values for the positions (which are then set to -2147483648), however this can be useful if one is only interested by the buttons status.
JOY_GETTIMEOUT int *limit
Get the time limit (in microseconds) used for reading the joystick status.
JOY_SET_X_OFFSET int *offset
Set the value to be added to the X position when reading the joystick status.
JOY_SET_Y_OFFSET int *offset
Set the value to be added to the Y position when reading the joystick status.
JOY_GET_X_OFFSET int *offset
Get the value which is added to the X position when reading the joystick status.
JOY_GET_Y_OFFSET int *offset
Get the value which is added to the Y position when reading the joystick status.

TECHNICAL SPECIFICATIONS

The pinout of the DB-15 connector is as follow:
1 XY1 (+5v)
2 Switch 1
3 X1 (potentiometer #1)
4 Switch 1 (GND)
5 Switch 2 (GND)
6 Y1 (potentiometer #2)
7 Switch 2
8 N.C.
9 XY2 (+5v)
10 Switch 4
11 X2 (potentiometer #3)
12 Switch 3&4 (GND)
13 Y2 (potentiometer #4)
14 Switch 3
15 N.C.

Pots are normally 0-150k variable resistors (0-100k sometimes), and according to the IBM techref, the time is given by Time = 24.2e-6s + 0.011e-6s * R/Ohms

FILES

/dev/joy?
joystick device files

HISTORY

The joystick driver appeared in
.Fx 2.0.5 .

AUTHORS


.An Jean-Marc Zucconi Aq
jmz@cabri.obs-besancon.fr

January 23, 1995 JOY (4)
shtml">manServer 1.07 from joy.4 using doc macros.


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