Input: joystick - refer to /dev/input/js0 in documentation

By default, the device is opened in blocking mode.

	int fd = open ("/dev/js0", O_RDONLY);

	int fd = open ("/dev/input/js0", O_RDONLY);

2. Event Reading

  For testing the joystick driver functionality, there is the jstest

program in the utilities package. You run it by typing:

	jstest /dev/js0

	jstest /dev/input/js0

  And it should show a line with the joystick values, which update as you

move the stick, and press its buttons. The axes should all be zero when the

some analog joysticks, that either do not use linear resistors, or if you

want better precision, you can use the jscal program

	jscal -c /dev/js0

	jscal -c /dev/input/js0

 included in the joystick package to set better correction coefficients than

what the driver would choose itself.

calibration using the jstest command, and if you do, you then can save the

correction coefficients into a file

	jscal -p /dev/js0 > /etc/joystick.cal

	jscal -p /dev/input/js0 > /etc/joystick.cal

  And add a line to your rc script executing that file

5. FAQ

~~~~~~

Q: Running 'jstest /dev/js0' results in "File not found" error. What's the

Q: Running 'jstest /dev/input/js0' results in "File not found" error. What's the

   cause?

A: The device files don't exist. Create them (see section 2.2).