microtimer.nc

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// $Id: MicroTimer.nc,v 1.3 2003/10/07 21:44:50 idgay Exp $

/*									tab:4
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 * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
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 * Copyright (c) 2002-2003 Intel Corporation
 * All rights reserved.
 *
 * This file is distributed under the terms in the attached INTEL-LICENSE     
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 * Intel Research Berkeley, 2150 Shattuck Avenue, Suite 1300, Berkeley, CA, 
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 */
/*
 * Authors:		Sam Madden, based on TIMER.comp by Su Ping
 *			David Gay (cleaned up interface)
 * Date last modified:  7/16/02
 *
 */

/**
 * This interface provides a generic timer that can be used to generate
 * events at regular intervals. This interface is for high-precision,
 * but limited duration, intervals
 * @author Sam Madden
 * @author based on TIMER.comp by Su Ping
 */
interface MicroTimer {

  /**
   * Start the timer. 
   *  @param interval The timer interval in <b>microseconds</b> (1/1024
   *  second). Note that the 
   *    timer cannot support an arbitrary range of intervals.
   *    (Unfortunately this interface does not specify the valid range
   *    of timer intervals, which are specific to a platform.)
   *  @return Returns SUCCESS if the timer could be started with the 
   *    given interval.
   */
  command result_t start(uint32_t interval);

  /**
   * Stop the timer, preventing it from firing again. Note that the
   * timer might still fire before stop returns.
   * @return SUCCESS if the timer could be stopped, or FAIL if the timer 
   * is not running.
   */
  async command result_t stop();

  /**
   * The signal generated by the timer when it fires.
   */
  async event result_t fired();
}