channelmonitor.nc

tinyos-2.0源代码！转载而已！要的尽管拿！

/* -*- mode:c++; indent-tabs-mode: nil -*-
 * Copyright (c) 2004, Technische Universitaet Berlin
 * 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 Technische Universitaet Berlin 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, 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.
 */
 
 
 /**
 * 
 * This interface is an abstraction of Clear Channel Assessment (CCA) in byte radios.
 * It provides commands and events to perform CCA.
 *
 * @see ChannelMonitorControl
 * @see ChannelMonitorData
 *
 * @author Kevin Klues ([e-mail])
 */
interface ChannelMonitor {
    /** 
    * Start observing the channel.
    * Either the event channelBusy() or channelIdle() will be indicated.
    *
    * @return SUCCESS on success
    *         FAIL otherwise.
    */
    async command error_t start();

    /**
     *  Indicates that the channel is busy.
     */
    async event void channelBusy();

    /** 
     *  Indicates that the channel is idle.
     */
    async event void channelIdle();
    
    /**
     * Tells the channel monitor that the last busy event
     * actually indicated a message.
     */
    async command void rxSuccess();
}