code: /**
   * Copyright (c) 2004-2005, Regents of the University of California
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * Redistributions of source code must retain the above copyright notice,
   * this list of conditions and the following disclaimer.
   *
   * 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.
   *
   * Neither the name of the University of California, Los Angeles nor the
   * names of its contributors may be used to endorse or promote products
   * derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "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 THE COPYRIGHT
   * OWNER 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,
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   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  package avrora.sim.platform.sensors;
  
  import avrora.sim.FiniteStateMachine;
  import avrora.sim.mcu.*;
  
  /**
   * The <code>AccelSensorPower</code> handles the Power pin for the acceleration sensor
   *
   * @author Ben L. Titzer
   * @author Zainul M. Charbiwala
   * @author Daniel Minder
   */
  public class AccelSensorPower {
  
      protected final FiniteStateMachine fsm;
  
      protected static final String[] names = { "power down", "on" };
      protected boolean on;
  
      public AccelSensorPower(AtmelMicrocontroller m, String onPin) {
          m.getPin(onPin).connectOutput(new OnPin());
          fsm = new FiniteStateMachine(m.getClockDomain().getMainClock(), 0, names, 0);
      }
  
      class OnPin implements Microcontroller.Pin.Output {
          public void write(boolean val) {
              on = val;
              fsm.transition(state());
          }
      }
  
      private int state() {
          if ( !on ) return 0;
          else return 1;
      }
      
      public boolean isOn() {
        return on;
      }
  }
  