msp430timerp.nc

tinyos-2.x.rar

/* "Copyright (c) 2000-2003 The Regents of the University of California.
 * All rights reserved.
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 * documentation for any purpose, without fee, and without written agreement
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 *
 * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
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 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
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/**
 * @author Cory Sharp <[e-mail]>
 */

#include "msp430regtypes.h"

generic module Msp430TimerP(
  uint16_t TxIV_addr,
  uint16_t TxR_addr,
  uint16_t TxCTL_addr,
  uint16_t TxIFG,
  uint16_t TxCLR,
  uint16_t TxIE,
  uint16_t TxSSEL0,
  uint16_t TxSSEL1,
  bool isClockSourceAsync ) @safe()
{
  provides interface Msp430Timer as Timer;
  provides interface Msp430TimerEvent as Event[uint8_t n];
  uses interface Msp430TimerEvent as Overflow;
  uses interface Msp430TimerEvent as VectorTimerX0;
  uses interface Msp430TimerEvent as VectorTimerX1;
}
implementation
{
  #define TxIV (*TCAST(volatile TYPE_TAIV* ONE, TxIV_addr))
  #define TxR (*TCAST(volatile TYPE_TAR* ONE, TxR_addr))
  #define TxCTL (*TCAST(volatile TYPE_TACTL* ONE, TxCTL_addr))

  async command uint16_t Timer.get()
  {
    // CSS 10 Feb 2006: Brano Kusy notes MSP430 User's Guide, Section 12.2.1,
    // Note says reading a counter may return garbage if its clock source is
    // async.  The noted work around is to take a majority vote.

    if( isClockSourceAsync ) {
      atomic {
        uint16_t t0;
        uint16_t t1=TxR;
        do { t0=t1; t1=TxR; } while( t0 != t1 );
        return t1;
      }
    }
    else {
      return TxR;
    }
  }

  async command bool Timer.isOverflowPending()
  {
    return TxCTL & TxIFG;
  }

  async command void Timer.clearOverflow()
  {
    CLR_FLAG(TxCTL,TxIFG);
  }

  async command void Timer.setMode( int mode )
  {
    TxCTL = (TxCTL & ~(MC1|MC0)) | ((mode<<4) & (MC1|MC0));
  }

  async command int Timer.getMode()
  {
    return (TxCTL & (MC1|MC0)) >> 4;
  }

  async command void Timer.clear()
  {
    TxCTL |= TxCLR;
  }

  async command void Timer.enableEvents()
  {
    TxCTL |= TxIE;
  }

  async command void Timer.disableEvents()
  {
    TxCTL &= ~TxIE;
  }

  async command void Timer.setClockSource( uint16_t clockSource )
  {
    TxCTL = (TxCTL & ~(TxSSEL0|TxSSEL1)) | ((clockSource << 8) & (TxSSEL0|TxSSEL1));
  }

  async command void Timer.setInputDivider( uint16_t inputDivider )
  {
    TxCTL = (TxCTL & ~(ID0|ID1)) | ((inputDivider << 6) & (ID0|ID1));
  }

  async event void VectorTimerX0.fired()
  {
    signal Event.fired[0]();
  }

  async event void VectorTimerX1.fired()
  {
    uint8_t n = TxIV;
    signal Event.fired[ n >> 1 ]();
  }

  async event void Overflow.fired()
  {
    signal Timer.overflow();
  }

  default async event void Timer.overflow()
  {
  }

  default async event void Event.fired[uint8_t n]()
  {
  }
}