jtimer.c

在Freescale16位单片机MC9s12dp256上移植了J1939源码和操作系统（ucOSII）。

/*--------------------------------------------------------------------
       TIMER.C
  --------------------------------------------------------------------
       Copyright (C) 1998-2004 Vector Informatik GmbH, Stuttgart

       Function: Implementation of timer dependent routines
  --------------------------------------------------------------------

* Comments:       Includes BAM and CMDT
*                 
*
* Version  Date         Author           Comments
* -------  ----------   --------------   ------------------------------
*     0.9    --.--.--   Hi               Create
*     2.0    18.06.2001 Ma               Version 2.0 new buffer concept and
*                                        documented for doxygen  
*     2.1    16.07.2003 Ma               removed unused variables
*     2.2    24.06.2004 Ma               removed unused function 'TimerHandler()'
*
* Copyright (c) 1998 - 2004 Vector Informatik GmbH                                
*/

/*--------------------------------------------------------------------*/
/*  include files                                                     */
/*--------------------------------------------------------------------*/
#ifdef WIN32
# define STRICT
# include <windows.h>
#endif

#include "Includes.h"

#include "PortAB.h"
#include "Types.h"
#include "J1939.h"
#include "JTarget.h"
#include "JCanCntrl.h"
#include "JTimerDef.h"
#include "J1939CFG.h"
#include "J1939PGN.h"
#include "J1939TRA.h"
#include "J1939EXT.h"

#include <stdio.h>

/*--------------------------------------------------------------------*/
/*  variable definitions                                              */
/*--------------------------------------------------------------------*/
STATIC WORD DATA wSystemTime;      /*!< basic period of the timer   */
STATIC WORD DATA wTimerIncrement;  /*!< incremented every interrupt */

#pragma CODE_SEG NON_BANKED

void Tim_PIT(void)
{
  Timer_ClearPendingInterrupt();
  wTimerIncrement = (WORD)(wTimerIncrement + wSystemTime);
  Tim_ReloadTimer();
} /* Tim_PIT */


#pragma CODE_SEG DEFAULT_ROM
/*!
  \brief Initialize system timer.

  This function is called from the protocol stack to set up the system timer.
  An optional hardware timer is configured.

  \param wTime - basic period of the system timer
*/
void Tim_InitTimer(WORD wTime)
{
  wSystemTime = wTime;
  wTimerIncrement = 0;
#if TIME_FROM_OS == 1 
#else
  Tim_ConfigureTimer();
#endif /* TIME_FROM_OS == 1 */
} /* Tim_InitTimer */

/*!
  \brief Start system timer.

  This function is called from the protocol stack to start the system timer.
  An optional hardware timer is enabled.

  \retval TRUE - timer is running
  \retval FALSE - timer not successful started
*/
BOOLEAN Tim_StartTimer(void)
{
#if TIME_FROM_OS == 1
#else
  Tim_EnableTimer();
#endif /* TIME_FROM_OS == 1 */
  return TRUE;
} /* Tim_StartTimer */


/*!
  \brief Stop system timer.

  This function is called from the protocol stack to stop the system timer.
  An optional hardware timer is disabled.

  \retval TRUE - timer has been stopped
  \retval FALSE - timer not stopped
*/
BOOLEAN Tim_StopTimer(void)
{
#if TIME_FROM_OS == 1
#else
    Tim_DisableTimer();
#endif /* TIME_FROM_OS == 1 */
  return TRUE;
} /* Tim_StopTimer */


/*!
  \brief Get the current time.

  This function is called from the protocol stack to get the current value
  of the system timer.

  \return current time
*/

BOOLEAN Tim_CheckTimeOut(WORD wTimeStart, WORD wTimeNow, WORD wTimeOut)
/* END_FCTCALL *************************************************************/
{
#define wActivateCounter ((WORD)(wTimeOut+wTimeStart))
  if (wActivateCounter > wTimeStart)
  {
    if ((wTimeNow >= wActivateCounter) ||
        (wTimeNow < wTimeStart))
    {
      return TRUE;
    }
  }
  else if ((wTimeNow >= wActivateCounter) &&
           (wTimeNow < wTimeStart))
  {
    return TRUE;
  }
  return FALSE;
}

WORD Tim_GetCurrentTime(void)
{
#if TIME_FROM_OS == 1
# ifdef WIN32
  return (WORD)GetTickCount();
# else
  return (WORD)GetOsTicks();
# endif /* WIN32 */
#endif
#if TIME_FROM_OS == 2
  return (WORD)(10*OSTimeGet());
#else
  return wTimerIncrement;
#endif /* else TIME_FROM_OS == 1 */
} /* Tim_GetCurrentTime */

/*--------------------------------------------------------------------*/
/*  documentation                                                     */
/*--------------------------------------------------------------------*/

/*!
  \file
  \brief Implementation of timer dependent routines.
*/