9 .Nd joystick device driver
11 To link into the kernel:
14 To load as a kernel loadable module:
18 .Pa /boot/device.hints :
19 .Cd hint.joy.0.at="isa"
20 .Cd hint.joy.0.port="0x201"
24 The joystick device driver allows applications to read the status of
27 This device may be opened by only one process at a time.
29 The joystick status is read from a structure via a read()
31 The structure is defined in the header file as follows:
33 .Bd -literal -offset indent
35 int x; /* x position */
36 int y; /* y position */
37 int b1; /* button 1 status */
38 int b2; /* button 2 status */
42 Positions are typically in the range 0-2000.
43 .Ss One line perl example:
45 perl -e 'open(JOY,"/dev/joy0")||die;while(1)
46 {sysread(JOY,$x,16);@j=unpack("iiii",$x);print "@j\\n";sleep(1);}'
49 Several ioctl() calls are also available.
50 They take an argument of
52 .Bl -tag -width JOY_SET_X_OFFSET
53 .It Dv JOY_SETTIMEOUT Fa int *limit
54 Set the time limit (in microseconds) for reading the joystick
57 too small may prevent to get correct values for the positions (which
58 are then set to -2147483648), however this can be useful if one is
59 only interested by the buttons status.
60 .It Dv JOY_GETTIMEOUT Fa int *limit
61 Get the time limit (in microseconds) used for reading the joystick
63 .It Dv JOY_SET_X_OFFSET Fa int *offset
64 Set the value to be added to the X position when reading the joystick
66 .It Dv JOY_SET_Y_OFFSET Fa int *offset
67 Set the value to be added to the Y position when reading the joystick
69 .It Dv JOY_GET_X_OFFSET Fa int *offset
70 Get the value which is added to the X position when reading the joystick
72 .It Dv JOY_GET_Y_OFFSET Fa int *offset
73 Get the value which is added to the Y position when reading the joystick
76 .Sh TECHNICAL SPECIFICATIONS
77 The pinout of the DB-15 connector is as follow:
81 3 X1 (potentiometer #1)
84 6 Y1 (potentiometer #2)
89 11 X2 (potentiometer #3)
91 13 Y2 (potentiometer #4)
96 Pots are normally 0-150k variable resistors (0-100k sometimes), and
97 according to the IBM techref, the time is given by
98 Time = 24.2e-6s + 0.011e-6s * R/Ohms
100 .Bl -tag -width /dev/joy?
102 joystick device files
105 The joystick driver appeared in
108 .An Jean-Marc Zucconi Aq jmz@cabri.obs-besancon.fr