$FreeBSD: head/share/man/man4/joy.4 68246 2000-11-02 14:23:53Z sheldonh $

.Dd January 23, 1995 .Dt JOY 4 i386 .Sh NAME .Nm joy .Nd joystick device driver .Sh SYNOPSIS To link into the kernel: .Cd device joy

p To load as a kernel loadable module: .Dl kldload joy

p .Fd #include <machine/joystick.h> .Sh DESCRIPTION The joystick device driver allows applications to read the status of the PC joystick.

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

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

p d -literal -offset indent struct joystick { int x; /* x position */ int y; /* y position */ int b1; /* button 1 status */ int b2; /* button 2 status */ }; .Ed

p Positions are typically in the range 0-2000. .Ss 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);}' .Ss ioctl calls Several ioctl() calls are also available. They take an argument of type int * l -tag -width JOY_SET_X_OFFSET t Dv 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. t Dv JOY_GETTIMEOUT Fa int *limit Get the time limit (in microseconds) used for reading the joystick status. t Dv JOY_SET_X_OFFSET Fa int *offset Set the value to be added to the X position when reading the joystick status. t Dv JOY_SET_Y_OFFSET Fa int *offset Set the value to be added to the Y position when reading the joystick status. t Dv JOY_GET_X_OFFSET Fa int *offset Get the value which is added to the X position when reading the joystick status. t Dv JOY_GET_Y_OFFSET Fa int *offset Get the value which is added to the Y position when reading the joystick status. .Sh TECHNICAL SPECIFICATIONS The pinout of the DB-15 connector is as follow:

p 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.

p 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 .Sh FILES l -tag -width /dev/joy? t Pa /dev/joy? joystick device files .Sh AUTHORS .An Jean-Marc Zucconi Aq jmz@cabri.obs-besancon.fr .Sh HISTORY The joystick driver appeared in .Fx 2.0.5 .