PIO.java

/*
  PIO.java

  (c) 2014 Ed Swartz

  All rights reserved. This program and the accompanying materials
  are made available under the terms of the Eclipse Public License v1.0
  which accompanies this distribution, and is available at
  http://www.eclipse.org/legal/epl-v10.html
 */
package v9t9.engine.dsr.rs232;

import java.util.Timer;
import java.util.TimerTask;

import v9t9.common.dsr.IOBuffer;
import v9t9.common.dsr.IPIOHandler;
import v9t9.engine.Dumper;
/**
 * This manages high-level emulation of the RS232.
 * @author ejs
 *
 */
public class PIO {
	private Dumper dumper;
	private IPIOHandler handler;
	private Timer timer;

	private IOBuffer xmitBuffer = new IOBuffer(256), recvBuffer = new IOBuffer(256);
	
	public PIO(Dumper dumper) {
		this.handler = new PIOHandler();
		this.dumper = dumper;
		timer = new Timer(true);
		timer.schedule(new TimerTask() {

			@Override
			public void run() {
				pioMonitor();
			}
			
		}, 0, 1000 / 50);
	}
	
	protected void pioMonitor() {
		if (handler != null) {
			// transmit buffered chars.
			handler.transmitChars(xmitBuffer);
		} else {
			xmitBuffer.clear();
		}
	}
	/**
	 * @param handler the handler to set
	 */
	public void setHandler(IPIOHandler handler) {
		this.handler = handler;
	}
	/**
	 * @return the handler
	 */
	public IPIOHandler getHandler() {
		return handler;
	}

	/**
	 * @return the dumper
	 */
	public Dumper getDumper() {
		return dumper;
	}

	public void transmitChar(byte ch) {
		dumper.info(String.format("PIO: Buffering char %02X (%c)", ch, (char) ch));

		xmitBuffer.add(ch);
	}

	public void dump()
	{
		StringBuilder sb = new StringBuilder(); 
	
		sb.append(String.format("PIO: Write buffer: %s  Read buffer: %s",
			 xmitBuffer, recvBuffer));
	
		dumper.info(sb.toString());
	}

	/**
	 * 
	 */
	public void clear() {
		xmitBuffer.clear();
		recvBuffer.clear();
		dump();
	}

	public IOBuffer getRecvBuffer() {
		return recvBuffer;
	}
	public IOBuffer getXmitBuffer() {
		return xmitBuffer;
	}

}