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JOY(4FREEBSD) - Linux man page online | Special files

Joystick device driver.

Chapter
January 23, 1995
JOY(4) BSD Kernel Interfaces Manual JOY(4)

NAME

joy — joystick device driver

SYNOPSIS

To compile this driver into the kernel, place the following lines in your kernel configura‐ tion file: device joy Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): joy_load="YES" In /boot/device.hints: hint.joy.0.at="isa" hint.joy.0.port="0x201" hint.joy.1.at="isa" hint.joy.1.port="0x201" #include <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 posi‐ tions (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 sta‐ tus. JOY_SET_Y_OFFSET int *offset Set the value to be added to the Y position when reading the joystick sta‐ tus. 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 technical reference, the time is given by Time = 24.2e-6s + 0.011e-6s * R/Ohms

FILES

/dev/joy? joystick device files

HISTORY

The joy driver appeared in FreeBSD 2.0.5.

AUTHORS

Jean-Marc Zucconi <@cabri.obs-besancon.fr>
BSD January 23, 1995 BSD
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