1111b49c35
of the typeset output, tend to make diffs harder to read and provide bad examples for new-comers to mdoc.
97 lines
2.5 KiB
Groff
97 lines
2.5 KiB
Groff
.\"
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.\" $FreeBSD$
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.\"
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.Dd January 23, 1995
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.Dt JOY 4 i386
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.Sh NAME
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.Nm joy
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.Nd joystick device driver
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.Sh SYNOPSIS
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.Cd device joy0 at isa? port "IO_GAME"
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.Fd #include <machine/joystick.h>
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.Sh DESCRIPTION
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The joystick device driver allows applications to read the status of
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the PC joystick.
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.Pp
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This device may be opened by only one process at a time.
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.Pp
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The joystick status is read from a structure via a read()
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call.
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The structure is defined in the header file as follows:
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.Pp
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.Bd -literal -offset indent
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struct joystick {
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int x; /* x position */
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int y; /* y position */
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int b1; /* button 1 status */
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int b2; /* button 2 status */
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};
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.Ed
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.Pp
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Positions are typically in the range 0-2000.
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.Ss One line perl example:
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perl -e 'open(JOY,"/dev/joy0")||die;while(1)
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.br
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{sysread(JOY,$x,16);@j=unpack("iiii",$x);print "@j\\n";sleep(1);}'
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.Ss ioctl calls
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Several ioctl() calls are also available.
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They take an argument of
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type int *
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.Bl -tag -width JOY_SET_X_OFFSET
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.It Dv JOY_SETTIMEOUT Fa int *limit
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Set the time limit (in microseconds) for reading the joystick
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status.
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Setting a value
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too small may prevent to get correct values for the positions (which
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are then set to -2147483648), however this can be useful if one is
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only interested by the buttons status.
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.It Dv JOY_GETTIMEOUT Fa int *limit
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Get the time limit (in microseconds) used for reading the joystick
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status.
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.It Dv JOY_SET_X_OFFSET Fa int *offset
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Set the value to be added to the X position when reading the joystick
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status.
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.It Dv JOY_SET_Y_OFFSET Fa int *offset
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Set the value to be added to the Y position when reading the joystick
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status.
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.It Dv JOY_GET_X_OFFSET Fa int *offset
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Get the value which is added to the X position when reading the joystick
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status.
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.It Dv JOY_GET_Y_OFFSET Fa int *offset
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Get the value which is added to the Y position when reading the joystick
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status.
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.Sh TECHNICAL SPECIFICATIONS
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The pinout of the DB-15 connector is as follow:
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.Pp
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1 XY1 (+5v)
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2 Switch 1
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3 X1 (potentiometer #1)
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4 Switch 1 (GND)
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5 Switch 2 (GND)
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6 Y1 (potentiometer #2)
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7 Switch 2
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8 N.C.
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9 XY2 (+5v)
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10 Switch 4
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11 X2 (potentiometer #3)
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12 Switch 3&4 (GND)
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13 Y2 (potentiometer #4)
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14 Switch 3
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15 N.C.
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.Pp
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Pots are normally 0-150k variable resistors (0-100k sometimes), and
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according to the IBM techref, the time is given by
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Time = 24.2e-6s + 0.011e-6s * R/Ohms
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.Sh FILES
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.Bl -tag -width /dev/joy?
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.It Pa /dev/joy?
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joystick device files
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.Sh AUTHORS
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.An Jean-Marc Zucconi Aq jmz@cabri.obs-besancon.fr
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.Sh HISTORY
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The joystick driver appeared in
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.Fx 2.0.5 .
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