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joy.4freebsd

Langue: en

Version: 300700 (debian - 07/07/09)

Section: 4 (Pilotes et protocoles réseau)


BSD mandoc

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.conf5:

 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

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 Fa 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 Fa int *limit
Get the time limit (in microseconds) used for reading the joystick status.
JOY_SET_X_OFFSET Fa int *offset
Set the value to be added to the X position when reading the joystick status.
JOY_SET_Y_OFFSET Fa int *offset
Set the value to be added to the Y position when reading the joystick status.
JOY_GET_X_OFFSET Fa int *offset
Get the value which is added to the X position when reading the joystick status.
JOY_GET_Y_OFFSET Fa 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 driver appeared in Fx 2.0.5 .

AUTHORS

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