58 lines
1.9 KiB
Groff
58 lines
1.9 KiB
Groff
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.Dd January 23, 1995
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.Dt JOY 4
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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 get in an array of 4 integers via a read()
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call.
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.br
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The X and Y positions are stored in values 0 and 1 of the array,
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and the state of the 2 buttons are stores in values 2 and 3 of the
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array. 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. 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_SET_TIMEOUT Fa int *limit
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Set the time limit (in microseconds) for reading the joystick
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status. 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_GET_TIMEOUT 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 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 AUTHOR
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Jean-Marc Zucconi <jmz@cabri.obs-besancon.fr>
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.Sh HISTORY
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The joystick driver appeared in FreeBSD 2.1
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