atm128alarmasyncc.nc

tinyos2.0版本驱动

// $Id: Atm128AlarmAsyncC.nc,v 1.3 2007/05/23 22:49:08 idgay Exp $
/*
 * Copyright (c) 2007 Intel Corporation
 * All rights reserved.
 *
 * This file is distributed under the terms in the attached INTEL-LICENSE     
 * file. If you do not find these files, copies can be found by writing to
 * Intel Research Berkeley, 2150 Shattuck Avenue, Suite 1300, Berkeley, CA, 
 * 94704.  Attention:  Intel License Inquiry.
 */
/**
 * Build a 32-bit alarm and counter from the atmega128's 8-bit timer 0
 * in asynchronous mode. Attempting to use the generic Atm128AlarmC
 * component and the generic timer components runs into problems
 * apparently related to letting timer 0 overflow.
 * 
 * So, instead, this version (inspired by the 1.x code and a remark from
 * Martin Turon) directly builds a 32-bit alarm and counter on top of timer 0
 * and never lets timer 0 overflow.
 *
 * @author David Gay
 */
generic configuration Atm128AlarmAsyncC(typedef precision, int divider) {
  provides {
    interface Init @atleastonce();
    interface Alarm<precision, uint32_t>;
    interface Counter<precision, uint32_t>;
  }
}
implementation
{
  components new Atm128AlarmAsyncP(precision, divider),
    HplAtm128Timer0AsyncC;

  Init = Atm128AlarmAsyncP;
  Alarm = Atm128AlarmAsyncP;
  Counter = Atm128AlarmAsyncP;

  Atm128AlarmAsyncP.Timer -> HplAtm128Timer0AsyncC;
  Atm128AlarmAsyncP.TimerCtrl -> HplAtm128Timer0AsyncC;
  Atm128AlarmAsyncP.Compare -> HplAtm128Timer0AsyncC;
  Atm128AlarmAsyncP.TimerAsync -> HplAtm128Timer0AsyncC;
}