109 lines
2.7 KiB
Groff
109 lines
2.7 KiB
Groff
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd January 23, 1995
|
|
.Dt JOY 4
|
|
.Os
|
|
.Sh NAME
|
|
.Nm joy
|
|
.Nd joystick device driver
|
|
.Sh SYNOPSIS
|
|
To link into the kernel:
|
|
.Cd device joy
|
|
.Pp
|
|
To load as a kernel loadable module:
|
|
.Dl kldload joy
|
|
.Pp
|
|
In
|
|
.Pa /boot/device.hints :
|
|
.Cd hint.joy.0.at="isa"
|
|
.Cd hint.joy.0.port="0x201"
|
|
.Pp
|
|
.In sys/joystick.h
|
|
.Sh DESCRIPTION
|
|
The joystick device driver allows applications to read the status of
|
|
the PC joystick.
|
|
.Pp
|
|
This device may be opened by only one process at a time.
|
|
.Pp
|
|
The joystick status is read from a structure via a read()
|
|
call.
|
|
The structure is defined in the header file as follows:
|
|
.Pp
|
|
.Bd -literal -offset indent
|
|
struct joystick {
|
|
int x; /* x position */
|
|
int y; /* y position */
|
|
int b1; /* button 1 status */
|
|
int b2; /* button 2 status */
|
|
};
|
|
.Ed
|
|
.Pp
|
|
Positions are typically in the range 0-2000.
|
|
.Ss One line perl example:
|
|
.Bd -literal -compact
|
|
perl -e 'open(JOY,"/dev/joy0")||die;while(1)
|
|
{sysread(JOY,$x,16);@j=unpack("iiii",$x);print "@j\\n";sleep(1);}'
|
|
.Ed
|
|
.Ss ioctl calls
|
|
Several ioctl() calls are also available.
|
|
They take an argument of
|
|
type int *
|
|
.Bl -tag -width JOY_SET_X_OFFSET
|
|
.It 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.
|
|
.It Dv JOY_GETTIMEOUT Fa int *limit
|
|
Get the time limit (in microseconds) used for reading the joystick
|
|
status.
|
|
.It Dv JOY_SET_X_OFFSET Fa int *offset
|
|
Set the value to be added to the X position when reading the joystick
|
|
status.
|
|
.It Dv JOY_SET_Y_OFFSET Fa int *offset
|
|
Set the value to be added to the Y position when reading the joystick
|
|
status.
|
|
.It Dv JOY_GET_X_OFFSET Fa int *offset
|
|
Get the value which is added to the X position when reading the joystick
|
|
status.
|
|
.It Dv JOY_GET_Y_OFFSET Fa int *offset
|
|
Get the value which is added to the Y position when reading the joystick
|
|
status.
|
|
.El
|
|
.Sh TECHNICAL SPECIFICATIONS
|
|
The pinout of the DB-15 connector is as follow:
|
|
.Bd -literal
|
|
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.
|
|
.Ed
|
|
.Pp
|
|
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
|
|
.Bl -tag -width /dev/joy?
|
|
.It Pa /dev/joy?
|
|
joystick device files
|
|
.El
|
|
.Sh HISTORY
|
|
The joystick driver appeared in
|
|
.Fx 2.0.5 .
|
|
.Sh AUTHORS
|
|
.An Jean-Marc Zucconi Aq jmz@cabri.obs-besancon.fr
|