NAME

       joy — joystick device driver

SYNOPSIS

       To compile this driver into the kernel, place the following lines in your kernel configuration 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 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 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 <jmz@cabri.obs-besancon.fr>

Debian                                          January 23, 1995                                          JOY(4)