SDL_JoystickOpen(3) SDL API Reference SDL_JoystickOpen(3)NAME
SDL_JoystickOpen- Opens a joystick for use.
SYNOPSIS
#include "SDL.h"
SDL_Joystick *SDL_JoystickOpen(int index);
DESCRIPTION
Opens a joystick for use within SDL. The index refers to the N'th joystick in the system. A joystick must be opened before it game be used.
RETURN VALUE
Returns a SDL_Joystick structure on success. NULL on failure.
EXAMPLES
SDL_Joystick *joy;
// Check for joystick
if(SDL_NumJoysticks()>0){
// Open joystick
joy=SDL_JoystickOpen(0);
if(joy)
{
printf("Opened Joystick 0
");
printf("Name: %s
", SDL_JoystickName(0));
printf("Number of Axes: %d
", SDL_JoystickNumAxes(joy));
printf("Number of Buttons: %d
", SDL_JoystickNumButtons(joy));
printf("Number of Balls: %d
", SDL_JoystickNumBalls(joy));
}
else
printf("Couldn't open Joystick 0
");
// Close if opened
if(SDL_JoystickOpened(0))
SDL_JoystickClose(joy);
}
SEE ALSO
SDL_JoystickClose
SDL Tue 11 Sep 2001, 23:00 SDL_JoystickOpen(3)
Check Out this Related Man Page
JOY(4) BSD Kernel Interfaces Manual JOY(4)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.conf(5):
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"
#include <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
";sleep(1);}'
ioctl calls
Several ioctl() calls are also available. They take an argument of type int *
JOY_SETTIMEOUT 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 int *limit
Get the time limit (in microseconds) used for reading the joystick status.
JOY_SET_X_OFFSET int *offset
Set the value to be added to the X position when reading the joystick status.
JOY_SET_Y_OFFSET int *offset
Set the value to be added to the Y position when reading the joystick status.
JOY_GET_X_OFFSET int *offset
Get the value which is added to the X position when reading the joystick status.
JOY_GET_Y_OFFSET 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 joy driver appeared in FreeBSD 2.0.5.
AUTHORS
Jean-Marc Zucconi <jmz@cabri.obs-besancon.fr>
BSD January 23, 1995 BSD