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/*
* Copyright 2011 Phidgets Inc. All rights reserved.
*/
package com.phidgets;
import java.util.Iterator;
import java.util.LinkedList;
import com.phidgets.event.*;
/**
* This class represents a Phidget Bridge. All methods
* to manipulate the Phidget Bridge are implemented in this class.
* <p>
*
* @author Phidgets Inc.
*/
public final class BridgePhidget extends Phidget
{
public BridgePhidget () throws PhidgetException
{
super (create ());
}
private static native long create () throws PhidgetException;
/**
* 1 Gain. This is used with {@link #getGain(int) getGain} and {@link #setGain(int, int) setGain}
*/
public static final int PHIDGET_BRIDGE_GAIN_1 = 1;
/**
* 8 Gain. This is used with {@link #getGain(int) getGain} and {@link #setGain(int, int) setGain}
*/
public static final int PHIDGET_BRIDGE_GAIN_8 = 2;
/**
* 16 Gain. This is used with {@link #getGain(int) getGain} and {@link #setGain(int, int) setGain}
*/
public static final int PHIDGET_BRIDGE_GAIN_16 = 3;
/**
* 32 Gain. This is used with {@link #getGain(int) getGain} and {@link #setGain(int, int) setGain}
*/
public static final int PHIDGET_BRIDGE_GAIN_32 = 4;
/**
* 64 Gain. This is used with {@link #getGain(int) getGain} and {@link #setGain(int, int) setGain}
*/
public static final int PHIDGET_BRIDGE_GAIN_64 = 5;
/**
* 128 Gain. This is used with {@link #getGain(int) getGain} and {@link #setGain(int, int) setGain}
*/
public static final int PHIDGET_BRIDGE_GAIN_128 = 6;
/**
* Unknown Gain. This is used with {@link #getGain(int) getGain} and {@link #setGain(int, int) setGain}
*/
public static final int PHIDGET_BRIDGE_GAIN_UNKNOWN = 7;
/**
* Returns the number of bridges.
* @return Number of bridges
*/
public native int getInputCount () throws PhidgetException;
/**
* Returns the value of the selected input, in mV/V. If the input is not enabled, an EPHIDGET_UNKNOWNVAL exception will be thrown. If the bridge is saturated
*, this will be equal to BridgeMax or BridgeMin and an error event will be fired - in this case, gain should be reduced if possible.
* @param index Index of the bridge
* @return bridge value
* @throws PhidgetException If this Phidget is not opened and attached, or if the index is out of range.
* See {@link com.phidgets.Phidget#open(int) open} for information on determining if a device is attached.
*/
public native double getBridgeValue (int index) throws PhidgetException;
/**
* Returns the minimum value that the selected bridge can measure, in mV/V. This value will depend on the selected gain. At a gain of 1, BridgeMin == -1000 mV/V.
* @param index Index of the bridge
* @return minimum value
* @throws PhidgetException If this Phidget is not opened and attached, or if the index is out of range.
* See {@link com.phidgets.Phidget#open(int) open} for information on determining if a device is attached.
*/
public native double getBridgeMin (int index) throws PhidgetException;
/**
* Returns the maximum value that the selected bridge can measure, in mV/V. This value will depend on the selected gain. At a gain of 1, BridgeMin == 1000 mV/V.
* @param index Index of the bridge
* @return maximum value
* @throws PhidgetException If this Phidget is not opened and attached, or if the index is out of range.
* See {@link com.phidgets.Phidget#open(int) open} for information on determining if a device is attached.
*/
public native double getBridgeMax (int index) throws PhidgetException;
/**
* Returns the enabled state of the specified bridge. This applies power between +5v and Ground, and starts measuring the differential on the +/- pins. By default, all bridges are
* disabled, and need to be explicitly enabled on startup.
* @param index Index of the bridge
* @return state of the specified bridge
* @throws PhidgetException If this Phidget is not opened and attached, or if the index is invalid.
* See {@link com.phidgets.Phidget#open(int) open} for information on determining if a device is attached.
*/
public native boolean getEnabled (int index) throws PhidgetException;
/**
* Sets the enabled state of the specified bridge. This applies power between +5v and Ground, and starts measuring the differential on the +/- pins. By default, all bridges are
* disabled, and need to be explicitly enabled on startup.
* @param index Index of the bridge
* @param state new state of the specified bridge
* @throws PhidgetException If this Phidget is not opened and attached, or if the index is invalid.
* See {@link com.phidgets.Phidget#open(int) open} for information on determining if a device is attached.
*/
public native void setEnabled (int index, boolean state) throws PhidgetException;
/**
* Returns the gain for the selected bridge. Note that increasing the gains will reduce the measurable
* voltage difference by the gain factor, with +-1000 mV/V being the maximum, with no gain.
* The possible values for gain are {@link #PHIDGET_BRIDGE_GAIN_1 PHIDGET_BRIDGE_GAIN_1},
* {@link #PHIDGET_BRIDGE_GAIN_8 PHIDGET_BRIDGE_GAIN_8}, {@link #PHIDGET_BRIDGE_GAIN_16 PHIDGET_BRIDGE_GAIN_16},
* {@link #PHIDGET_BRIDGE_GAIN_32 PHIDGET_BRIDGE_GAIN_32}, {@link #PHIDGET_BRIDGE_GAIN_64 PHIDGET_BRIDGE_GAIN_64},
* {@link #PHIDGET_BRIDGE_GAIN_128 PHIDGET_BRIDGE_GAIN_128}, {@link #PHIDGET_BRIDGE_GAIN_UNKNOWN PHIDGET_BRIDGE_GAIN_UNKNOWN}
* <p>
* @param index Index of the bridge
* @return gain
* @throws PhidgetException If this Phidget is not opened and attached, or if the index is invalid.
* See {@link com.phidgets.Phidget#open(int) open} for information on determining if a device is attached.
*/
public native int getGain (int index) throws PhidgetException;
/**
* Sets the gain for the selected bridge. Note that increasing the gains will reduce the measurable
* voltage difference by the gain factor, with +-1000 mV/V being the maximum, with no gain.
* <p>
* The possible values for gain are {@link #PHIDGET_BRIDGE_GAIN_1 PHIDGET_BRIDGE_GAIN_1},
* {@link #PHIDGET_BRIDGE_GAIN_8 PHIDGET_BRIDGE_GAIN_8}, {@link #PHIDGET_BRIDGE_GAIN_16 PHIDGET_BRIDGE_GAIN_16},
* {@link #PHIDGET_BRIDGE_GAIN_32 PHIDGET_BRIDGE_GAIN_32}, {@link #PHIDGET_BRIDGE_GAIN_64 PHIDGET_BRIDGE_GAIN_64},
* {@link #PHIDGET_BRIDGE_GAIN_128 PHIDGET_BRIDGE_GAIN_128}, {@link #PHIDGET_BRIDGE_GAIN_UNKNOWN PHIDGET_BRIDGE_GAIN_UNKNOWN}
* <p>
* @param index Index of the bridge
* @param gain new gain
* @throws PhidgetException If this Phidget is not opened and attached, or if the index is invalid.
* See {@link com.phidgets.Phidget#open(int) open} for information on determining if a device is attached.
*/
public native void setGain (int index, int gain) throws PhidgetException;
/**
* Returns the data rate, in ms. Data rate applies to all 4 bridges simultaneously. Setting a slower data rate will reduce
* noise at the cost of sample time. Also note that each bridge is being sampled only 1/4 of the time - this is okay for very stable signals,
* but for changing signals, it is best to set a higher sampling rate and do averaging in the software.
* <p>
* Data rate must be a multiple of 8ms. Trying to set something between multiplies of 8 will cause an EPHIDGET_INVALIDARG exception.
* <p>
* @return Data Rate
* @throws PhidgetException If this Phidget is not opened and attached, or if the index is invalid.
* See {@link com.phidgets.Phidget#open(int) open} for information on determining if a device is attached.
*/
public native int getDataRate () throws PhidgetException;
/**
* Sets the data rate, in ms. Data rate applies to all 4 bridges simultaneously. Setting a slower data rate will reduce
* noise at the cost of sample time. Also note that each bridge is being sampled only 1/4 of the time - this is okay for very stable signals,
* but for changing signals, it is best to set a higher sampling rate and do averaging in the software.
* <p>
* Data rate must be a multiple of 8ms. Trying to set something between multiplies of 8 will cause an EPHIDGET_INVALIDARG exception.
* <p>
* @param rate new data rate
* @throws PhidgetException If this Phidget is not opened and attached, or if the data rate is out of range
* See {@link com.phidgets.Phidget#open(int) open} for information on determining if a device is attached.
*/
public native void setDataRate (int rate) throws PhidgetException;
/**
* Gets the minimum supported data rate, in ms.
* @return minimum supported data rate
* @throws PhidgetException If this Phidget is not opened and attached.
* See {@link com.phidgets.Phidget#open(int) open} for information on determining if a device is attached.
*/
public native int getDataRateMin () throws PhidgetException;
/**
* Gets the maximum supported data rate, in ms.
* @return maximum supported data rate
* @throws PhidgetException If this Phidget is not opened and attached.
* See {@link com.phidgets.Phidget#open(int) open} for information on determining if a device is attached.
*/
public native int getDataRateMax () throws PhidgetException;
private final void enableDeviceSpecificEvents (boolean b)
{
enableBridgeDataEvents (b && bridgeDataListeners.size () > 0);
}
/**
* Adds a bridge data listener. The bridge data handler is a method that will be called at the specified data rate, for each enabled bridge. Value is the bridgeValue, in mV/V.
* <p>
* There is no limit on the number of bridge data handlers that can be registered for a particular Phidget.
*
* @param l An implemetation of the {@link com.phidgets.event.BridgeDataListener BridgeDataListener} interface
*/
public final void addBridgeDataListener (BridgeDataListener l)
{
synchronized (bridgeDataListeners)
{
bridgeDataListeners.add (l);
enableBridgeDataEvents (true);
}} private LinkedList bridgeDataListeners = new LinkedList ();
private long nativeBridgeDataHandler = 0;
public final void removeBridgeDataListener (BridgeDataListener l)
{
synchronized (bridgeDataListeners)
{
bridgeDataListeners.remove (l);
enableBridgeDataEvents (bridgeDataListeners.size () > 0);
}} private void fireBridgeData (BridgeDataEvent e)
{
synchronized (bridgeDataListeners)
{
for (Iterator it = bridgeDataListeners.iterator (); it.hasNext ();)
((BridgeDataListener) it.next ()).bridgeData (e);
}
}
private native void enableBridgeDataEvents (boolean b);
}
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