fc161.c

飞思卡尔单片机MC9SDG128B的脉冲捕获程序

/** ###################################################################
**     THIS BEAN MODULE IS GENERATED BY THE TOOL. DO NOT MODIFY IT.
**     Filename  : FC161.C
**     Project   : Capture
**     Processor : MC9S12DG128BCPV
**     Beantype  : FreeCntr16
**     Version   : Bean 02.051, Driver 01.09, CPU db: 2.87.280
**     Compiler  : Metrowerks HC12 C Compiler
**     Date/Time : 2008-3-5, 上午 09:25
**     Abstract  :
**         This device "FreeCntr16" implements 16-bit Free Running Counter
**     Settings  :
**         Timer name                  : ECT (16-bit)
**         Compare name                : TC0
**         Counter shared              : Yes
**
**         High speed mode
**             Prescaler               : divide-by-32
**             Clock                   : 250000 Hz
**           Resolution of timer
**             Xtal ticks              : 1600
**             microseconds            : 100
**             seconds (real)          : 0.0001000
**             Hz                      : 10000
**             kHz                     : 10
**
**         Initialization:
**              Timer                  : Enabled
**
**         Timer registers
**              Counter                : TCNT      [68]
**              Mode                   : TIOS      [64]
**              Run                    : TSCR1     [70]
**              Prescaler              : TSCR2     [77]
**
**         Compare registers
**              Compare                : TC0       [80]
**     Contents  :
**         Reset     - byte FC161_Reset(void);
**         GetTimeUS - byte FC161_GetTimeUS(word *Time);
**         GetTimeMS - byte FC161_GetTimeMS(word *Time);
**
**     (c) Copyright UNIS, spol. s r.o. 1997-2005
**     UNIS, spol. s r.o.
**     Jundrovska 33
**     624 00 Brno
**     Czech Republic
**     http      : www.processorexpert.com
**     mail      : [e-mail]
** ###################################################################*/


/* MODULE FC161. */

#include "FC161.h"

#pragma DATA_SEG FC161_DATA
#pragma CODE_SEG FC161_CODE

static word TTicks;                    /* Counter of timer ticks */
static word LTicks;                    /* Working copy of variable TTicks */
static bool TOvf;                      /* Counter overflow flag */
static bool LOvf;                      /* Working copy of variable TOvf */
/*
** ===================================================================
**     Method      :  LoadTicks (bean FreeCntr16)
**
**     Description :
**         The method loads actual number of timer ticks and actual state 
**         of overflow flag.
**         This method is internal. It is used by Processor Expert only.
** ===================================================================
*/
static void LoadTicks(void)
{
  EnterCritical();                     /* Save the PS register */
  LTicks = TTicks;                     /* Loading actual number of timer ticks */
  LOvf = TOvf;                         /* Loading actual state of "overflow flag" */
  ExitCritical();                      /* Restore the PS register */
}

/*
** ===================================================================
**     Method      :  FC161_Reset (bean FreeCntr16)
**
**     Description :
**         Clears the counter.
**     Parameters  : None
**     Returns     :
**         ---       - Error Code
** ===================================================================
*/
byte FC161_Reset(void)
{
  EnterCritical();                     /* Save the PS register */
  TC0 = TCNT + (word)25;               /* Store new value to compare register */
  TTicks =  0;                         /* Reset counter of timer ticks */
  TOvf = FALSE;                        /* Reset counter overflow flag */
  ExitCritical();                      /* Restore the PS register */
  return ERR_OK;                       /* OK */
}

/*
** ===================================================================
**     Method      :  FC161_GetTimeUS (bean FreeCntr16)
**
**     Description :
**         Returns the time (as a 16-bit unsigned integer) in microseconds
**         since the last resetting after the last reset.
**     Parameters  :
**         NAME            - DESCRIPTION
**       * Time            - A pointer to the returned 16-bit value
**                           in microseconds
**     Returns     :
**         ---             - Error code, possible codes:
**                           ERR_OK - OK
**                           ERR_SPEED - This device does not work in
**                           the active speed mode
**                           ERR_OVERFLOW - Software counter overflow
**                           ERR_MATH - Overflow during evaluation
** ===================================================================
*/
byte FC161_GetTimeUS(word *Time)
{
  dlong rtval;                         /* Result of two 32-bit numbers multiplication */

  LoadTicks();                         /* Load actual state of counter */
  if (LOvf) {                          /* Testing counter overflow */
    return ERR_OVERFLOW;               /* If yes then error */
  }
  PE_Timer_LngMul((dword)LTicks,(dword)1677721600,&rtval); /* Multiply ticks and high speed CPU mode coefficient */
  if (PE_Timer_LngHi3(rtval[0],rtval[1],Time)) { /* Is the result greater or equal than 65536 ? */
    return ERR_MATH;                   /* If yes then error */
  } else {                             /* Is the result less than 65536 ? */
    return ERR_OK;                     /* If yes then OK */
  }
}

/*
** ===================================================================
**     Method      :  FC161_GetTimeMS (bean FreeCntr16)
**
**     Description :
**         Returns the time (as a 16-bit unsigned integer) in milliseconds
**         since the last resetting after the last reset.
**     Parameters  :
**         NAME            - DESCRIPTION
**       * Time            - A pointer to the returned 16-bit value
**                           in milliseconds
**     Returns     :
**         ---             - Error code, possible codes:
**                           ERR_OK - OK
**                           ERR_SPEED - This device does not work in
**                           the active speed mode
**                           ERR_OVERFLOW - Software counter overflow
**                           ERR_MATH - Overflow during evaluation
** ===================================================================
*/
byte FC161_GetTimeMS(word *Time)
{
  dlong rtval;                         /* Result of two 32-bit numbers multiplication */

  LoadTicks();                         /* Load actual state of counter */
  if (LOvf) {                          /* Testing counter overflow */
    return ERR_OVERFLOW;               /* If yes then error */
  }
  PE_Timer_LngMul((dword)LTicks,(dword)429496730,&rtval); /* Multiply ticks and high speed CPU mode coefficient */
  if (PE_Timer_LngHi4(rtval[0],rtval[1],Time)) { /* Is the result greater or equal than 65536 ? */
    return ERR_MATH;                   /* If yes then error */
  } else {                             /* Is the result less than 65536 ? */
    return ERR_OK;                     /* If yes then OK */
  }
}

/*
** ===================================================================
**     Method      :  FC161_Init (bean FreeCntr16)
**
**     Description :
**         Initializes the associated peripheral(s) and the beans 
**         internal variables. The method is called automatically as a 
**         part of the application initialization code.
**         This method is internal. It is used by Processor Expert only.
** ===================================================================
*/
void FC161_Init(void)
{
  TTicks = 0;                          /* Counter of timer ticks */
  TOvf = FALSE;                        /* Counter overflow flag */
  /* TC0: BIT15=0,BIT14=0,BIT13=0,BIT12=0,BIT11=0,BIT10=0,BIT9=0,BIT8=0,BIT7=0,BIT6=0,BIT5=0,BIT4=1,BIT3=1,BIT2=0,BIT1=0,BIT0=1 */
  setReg16(TC0, 25);                   /* Store value to the compare register */ 
}

/*
** ===================================================================
**     Method      :  FC161_Interrupt (bean FreeCntr16)
**
**     Description :
**         The method services the interrupt of the selected peripheral(s)
**         and eventually invokes the beans event(s).
**         This method is internal. It is used by Processor Expert only.
** ===================================================================
*/
#pragma CODE_SEG __NEAR_SEG NON_BANKED
ISR(FC161_Interrupt)
{
  TC0 += (word)25;                     /* Add value corresponding with periode */
  TTicks++;                            /* Increment counter of timer ticks */
  if (TTicks == 0) {                   /* Testing counter overflow */
    TOvf = TRUE;                       /* If yes then set overflow flag */
  }
  TFLG1 = 1;                           /* Reset interrupt request flag */
}

#pragma CODE_SEG FC161_CODE

/* END FC161. */

/*
** ###################################################################
**
**     This file was created by UNIS Processor Expert 2.96 [03.76]
**     for the Freescale HCS12 series of microcontrollers.
**
** ###################################################################
*/