lejos.nxt
Class Poll

java.lang.Object
  lejos.nxt.Poll

public class Poll
extends Object

Provides blocking access to events from the NXT. Poll is a bit of a misnomer (since you don't 'poll' at all) but it takes its name from the Unix call of the same name.

Field Summary

static short	ALL_BUTTONS
static short	ALL_SENSORS
static short	BUTTON_MASK_SHIFT
static short	ENTER_MASK
static short	ESCAPE_MASK
static short	LEFT_MASK
static short	RIGHT_MASK
static short	SENSOR1_MASK
static short	SENSOR2_MASK
static short	SENSOR3_MASK
static short	SENSOR4_MASK
static short	SERIAL_MASK
static short	SERIAL_SHIFT

Constructor Summary

Poll()
Constructor.

Method Summary

int	poll(int mask, int millis) Wait for the sensor/button values to change then return.
void	setThrottle(int throttle) Set a throttle on the regularity with which inputs are polled.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

SENSOR1_MASK

public static final short SENSOR1_MASK

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Constant Field Values

SENSOR2_MASK

public static final short SENSOR2_MASK

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Constant Field Values

SENSOR3_MASK

public static final short SENSOR3_MASK

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Constant Field Values

SENSOR4_MASK

public static final short SENSOR4_MASK

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Constant Field Values

ALL_SENSORS

public static final short ALL_SENSORS

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Constant Field Values

ENTER_MASK

public static final short ENTER_MASK

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Constant Field Values

LEFT_MASK

public static final short LEFT_MASK

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Constant Field Values

RIGHT_MASK

public static final short RIGHT_MASK

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Constant Field Values

ESCAPE_MASK

public static final short ESCAPE_MASK

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Constant Field Values

ALL_BUTTONS

public static final short ALL_BUTTONS

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Constant Field Values

BUTTON_MASK_SHIFT

public static final short BUTTON_MASK_SHIFT

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Constant Field Values

SERIAL_MASK

public static final short SERIAL_MASK

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Constant Field Values

SERIAL_SHIFT

public static final short SERIAL_SHIFT

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Constant Field Values

Constructor Detail

Poll

public Poll()

Constructor.

Method Detail

poll

public final int poll(int mask,
                      int millis)
               throws InterruptedException

Wait for the sensor/button values to change then return.

Parameters:

mask - bit mask of values to monitor.

millis - wait for at most millis milliseconds. 0 = forever.

Returns:

a bit mask of the values that have changed

Throws:

InterruptedException

setThrottle

public final void setThrottle(int throttle)

Set a throttle on the regularity with which inputs are polled.

Parameters:

throttle - number of sensor reads between polls. Default value is 1. 0 means poll as often as possible. Sensor reads occur every 3ms.