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JOY(4)                 FreeBSD Kernel Interfaces Manual                 JOY(4)

NAME
     joy -- joystick device driver

SYNOPSIS
     To link into the kernel:
     device joy

     To load as a kernel loadable module:
           kldload joy

     #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 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 read-
                       ing the joystick status.

     JOY_SET_Y_OFFSET int *offset
                       Set the value to be added to the Y position  when read-
                       ing 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

AUTHORS
     Jean-Marc Zucconi <jmz@cabri.obs-besancon.fr>

HISTORY
     The joystick driver appeared in FreeBSD 2.0.5.

FreeBSD 4.10                   January 23, 1995                   FreeBSD 4.10

NAME | SYNOPSIS | DESCRIPTION | TECHNICAL SPECIFICATIONS | FILES | AUTHORS | HISTORY

Want to link to this manual page? Use this URL:
<http://www.freebsd.org/cgi/man.cgi?query=joy&sektion=4&manpath=FreeBSD+4.10-RELEASE>

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