slavepinm.nc

传感器网络中的嵌入式操作系统源代码

// $Id: SlavePinM.nc,v 1.5.4.5 2003/08/26 09:08:16 cssharp Exp $

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/*
 *
 * Authors:		Jason Hill, David Gay, Philip Levis
 * Date last modified:  $Id: SlavePinM.nc,v 1.5.4.5 2003/08/26 09:08:16 cssharp Exp $
 *
 */

/**
 * @author Jason Hill
 * @author David Gay
 * @author Philip Levis
 */


module SlavePinM {
  provides interface SlavePin;
  provides interface StdControl;
  uses interface HPLSlavePin;

}
implementation
{
  int8_t n;
  bool signalHigh;

  command result_t StdControl.init() {
    atomic
      {
	n = 1;
	signalHigh = FALSE;
      }
    return call HPLSlavePin.high();
  }

  command result_t StdControl.start() {
    return SUCCESS;
  }

  command result_t StdControl.stop() {
    return SUCCESS;
  }

  inline async command result_t SlavePin.low() {
    atomic
      {
	n--;
	call HPLSlavePin.low();
      }
    return SUCCESS;
  }

  task void signalHighTask() {
    atomic
      signalHigh = FALSE;

    signal SlavePin.notifyHigh();
  }

  inline async command result_t SlavePin.high(bool needEvent) {
    atomic
      {
	n++;
	if (n > 0)
	  {
	    call HPLSlavePin.high();
	    if (needEvent || signalHigh)
	      post signalHighTask();
	  }
	else
	  signalHigh |= needEvent;
      }
    return SUCCESS;
  }
}