testsounderm.nc

用于传感器网络的节点操作系统 TinyOS 结构设计非常有意思

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/* 
 * Authors:  Alec Woo
 * Last Modified:  08/20/02
 *
 */
/**
 * Implementation for TestSounder application.
 * 
 * When clock fires, this application toggles the sounder to make it buzzes.
 * 
 **/

includes sensorboard;
module TestSounderM {
  provides {
    interface StdControl;
  }
  uses {
    interface Clock;
    interface Leds;
    interface StdControl as SndControl;
  }
}
implementation {

  // declare module static variables here
  bool state;

  /**
   * Initialize the component. Initialize Clock, Leds
   *
   * @return returns <code>SUCCESS</code> or <code>FAILED</code>
   **/             
  command result_t StdControl.init() {
    state = FALSE;
    call SndControl.init();
    return SUCCESS;
  }

  /**
   * Start the component.
   *
   * @return returns <code>SUCCESS</code> or <code>FAILED</code>
   **/             
  command result_t StdControl.start() {
    return call Clock.setRate(TOS_I1PS, TOS_S1PS);
  }

  /**
   * Stop the component.
   *
   * @return returns <code>SUCCESS</code>
   **/             
  command result_t StdControl.stop() {
    return SUCCESS;
  }

  /**
   * In response to the <code>Clock.fire</code> event, toggle the Sounder and red led.
   *
   * @return returns <code>SUCCESS</code>
   **/             
  event result_t Clock.fire()
  {
    state = !state;

    if (state){
      call Leds.redOn();
      call SndControl.start();
    }else{
      call Leds.redOff();
      call SndControl.stop();
    }

    return SUCCESS;
  }
}