UartImpl.java

/*
 * Copyright 2011 Ytai Ben-Tsvi. All rights reserved.
 *  
 * 
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 * 
 *    1. Redistributions of source code must retain the above copyright notice, this list of
 *       conditions and the following disclaimer.
 * 
 *    2. Redistributions in binary form must reproduce the above copyright notice, this list
 *       of conditions and the following disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ARSHAN POURSOHI OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * The views and conclusions contained in the software and documentation are those of the
 * authors and should not be interpreted as representing official policies, either expressed
 * or implied.
 */
package ioio.lib.impl;

import android.util.Log;
import ioio.lib.api.IOIO;
import ioio.lib.api.Uart;
import ioio.lib.api.exception.ConnectionLostException;
import ioio.lib.impl.FlowControlledOutputStream.Sender;
import ioio.lib.impl.IncomingState.DataModuleListener;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

class UartImpl extends AbstractResource implements DataModuleListener, Sender, Uart
{
	private static final int MAX_PACKET = 64;
	
	private final int uartNum_;
	private final int rxPinNum_;
	private final int txPinNum_;
	private final FlowControlledOutputStream outgoing_ = new FlowControlledOutputStream(this, MAX_PACKET);
	private final QueueInputStream incoming_ = new QueueInputStream();
	
	public UartImpl(IOIOImpl ioio, int txPin, int rxPin, int uartNum) throws ConnectionLostException
  {
		super(ioio);
		uartNum_ = uartNum;
		rxPinNum_ = rxPin;
		txPinNum_ = txPin;
	}

	@Override
	public void dataReceived(byte[] data, int size) {
		incoming_.write(data, size);
	}

	@Override
	public void send(byte[] data, int size) {
		try {
			ioio_.protocol_.uartData(uartNum_, size, data);
		} catch (IOException e) {
			Log.e("UartImpl", e.getMessage());
		}
	}

	@Override
	synchronized public void close() {
		super.close();
		incoming_.close();
		outgoing_.close();
		ioio_.closeUart(uartNum_);
		if (rxPinNum_ != IOIO.INVALID_PIN) {
			ioio_.closePin(rxPinNum_);
		}
		if (txPinNum_ != IOIO.INVALID_PIN) {
			ioio_.closePin(txPinNum_);
		}
	}
	
	@Override
	synchronized public void disconnected() {
		super.disconnected();
		incoming_.kill();
		outgoing_.close();
	}

	@Override
	public InputStream getInputStream() {
		return incoming_;
	}

	@Override
	public OutputStream getOutputStream() {
		return outgoing_;
	}

	@Override
	public void reportAdditionalBuffer(int bytesRemaining) {
		outgoing_.readyToSend(bytesRemaining);
	}
}