hplsensirionsht11p.nc

tinyos2.0版本驱动

/*
 * Copyright (c) 2005-2006 Arch Rock Corporation
 * All rights reserved.
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 * - Redistributions in binary form must reproduce the above copyright
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 * - Neither the name of the Arch Rock Corporation 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
 * ARCHED ROCK OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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 */

#include "Timer.h"

/**
 * HplSensirionSht11P is a low-level component that controls power for
 * the Sensirion SHT11 sensor on the telosb platform.
 *
 * @author Phil Buonadonna <[e-mail]>
 * @version $Revision: 1.4 $ $Date: 2006/12/12 18:23:45 $
 */

module HplSensirionSht11P {
  provides interface SplitControl;
  uses interface Timer<TMilli>;
  uses interface HplPXA27xGPIOPin as DATA;
  uses interface HplPXA27xGPIOPin as SCK;
}
implementation {
  task void stopTask();

  command error_t SplitControl.start() {
    call DATA.setGAFRpin(0);
    call SCK.setGAFRpin(0);
    call Timer.startOneShot( 11 );
    return SUCCESS;
  }
  
  event void Timer.fired() {
    signal SplitControl.startDone( SUCCESS );
  }

  command error_t SplitControl.stop() {
    call SCK.setGPDRbit(FALSE);
    call SCK.setGPCRbit();
    call DATA.setGPDRbit(FALSE);
    call DATA.setGPCRbit();
    post stopTask();
    return SUCCESS;
  }

  task void stopTask() {
    signal SplitControl.stopDone( SUCCESS );
  }

  async event void DATA.interruptGPIOPin() { return; }
  async event void SCK.interruptGPIOPin() { return; }
}