ad3.c

飞思卡尔智能车的程序。红外循迹

**                           running
** ===================================================================
*/
byte AD3_Start(void)
{
  if (!EnUser) {                       /* Is the device disabled by user? */
    return ERR_DISABLED;               /* If yes then error */
  }
  if (ModeFlg != STOP) {               /* Is the device in running mode? */
    return ERR_BUSY;                   /* If yes then error */
  }
  ModeFlg = CONTINUOUS;                /* Set state of device to the continuos mode */
  HWEnDi();                            /* Start measurement */
  return ERR_OK;                       /* OK */
}

/*
** ===================================================================
**     Method      :  AD3_Stop (bean ADC)
**
**     Description :
**         This method stops the continuous measurement, which had
**         been started by <Start> method, or this method disables a
**         trigger mode which has been enabled by <EnableInt(Chan)
**         Trigger> or <EnableExt(Chan)Trigger> method (if these are
**         supported by HW). This method is available if at least
**         one of <Start>, <EnableInt(Chan)Trigger> or
**         <EnableExt(Chan)Trigger> methods is supported by A/D
**         converter device and it is enabled to be generated.
**     Parameters  : None
**     Returns     :
**         ---             - Error code, possible codes:
**                           ERR_OK - OK
**                           ERR_SPEED - This device does not work in
**                           the active speed mode
**                           ERR_BUSY - No continuous measurement is
**                           running. Neither internal trigger nor
**                           external trigger have been enabled (if
**                           these are supported by HW).
** ===================================================================
*/
byte AD3_Stop(void)
{
  if (ModeFlg != CONTINUOUS) {         /* Is the device in different mode than "continuos"? */
    return ERR_BUSY;                   /* If yes then error */
  }
  /* ATD1CTL3: ??=0,S8C=0,S4C=0,S2C=0,S1C=1,FIFO=0,FRZ1=0,FRZ0=0 */
  ATD1CTL3 = 8;                        /* Abort current measurement */
  ModeFlg = STOP;                      /* Set state of device to the stop mode */
  return ERR_OK;                       /* OK */
}

/*
** ===================================================================
**     Method      :  AD3_Measure (bean ADC)
**
**     Description :
**         This method performs one measurement on all channels that
**         are set in the bean inspector. (Note: If the <number of
**         conversions> is more than one the conversion of A/D
**         channels is performed specified number of times.)
**     Parameters  :
**         NAME            - DESCRIPTION
**         WaitForResult   - Wait for a result
**                           of a conversion. If <interrupt service>
**                           is disabled, A/D peripheral doesn't
**                           support measuring all channels at once
**                           or <Autoscan mode> property isn't
**                           enabled and at the same time the <number
**                           of channel> is greater than 1, then the
**                           WaitForResult parameter is ignored and
**                           the method waits for each result every
**                           time. If the <interrupt service> is
**                           disabled and a <number of conversions>
**                           is greater than 1, the parameter is
**                           ignored and the method also waits for
**                           each result every time.
**     Returns     :
**         ---             - Error code, possible codes:
**                           ERR_OK - OK
**                           ERR_SPEED - This device does not work in
**                           the active speed mode
**                           ERR_DISABLED - Device is disabled
**                           ERR_BUSY - A conversion is already
**                           running
** ===================================================================
*/
byte AD3_Measure(bool WaitForResult)
{
  if (!EnUser) {                       /* Is the device disabled by user? */
    return ERR_DISABLED;               /* If yes then error */
  }
  if (ModeFlg != STOP) {               /* Is the device in different mode than "stop"? */
    return ERR_BUSY;                   /* If yes then error */
  }
  ModeFlg = MEASURE;                   /* Set state of device to the measure mode */
  HWEnDi();                            /* Enable the device */
  if (WaitForResult) {                 /* Is WaitForResult TRUE? */
    while (ModeFlg == MEASURE) {}      /* If yes then wait for end of measurement */
  }
  return ERR_OK;                       /* OK */
}

/*
** ===================================================================
**     Method      :  AD3_GetValue8 (bean ADC)
**
**     Description :
**         This method returns the last measured values of all
**         channels justified to the left. Compared with <GetValue>
**         method this method returns more accurate result if the
**         <number of conversions> is greater than 1 and <AD
**         resolution> is less than 8 bits. In addition, the user
**         code dependency on <AD resolution> is eliminated.
**     Parameters  :
**         NAME            - DESCRIPTION
**       * Values          - Pointer to the array that
**                           contains the measured data.
**     Returns     :
**         ---             - Error code, possible codes:
**                           ERR_OK - OK
**                           ERR_SPEED - This device does not work in
**                           the active speed mode
**                           ERR_NOTAVAIL - Requested value not
**                           available
**                           ERR_OVERRUN - External trigger overrun
**                           flag was detected after the last value(s)
**                           was obtained (for example by GetValue).
**                           This error may not be supported on some
**                           CPUs (see generated code).
** ===================================================================
*/
byte AD3_GetValue8(byte *Values)
{
  if (!OutFlg) {                       /* Is measured value(s) available? */
    return ERR_NOTAVAIL;               /* If no then error */
  }
  *Values = AD3_OutV;                  /* Save measured values to the output buffer */
  return ERR_OK;                       /* OK */
}

/*
** ===================================================================
**     Method      :  AD3_GetChanValue8 (bean ADC)
**
**     Description :
**         This method returns the last measured value of required
**         channel justified to the left. Compared with
**         <GetChanValue> method this method returns more accurate
**         result if the <number of conversions> is greater than 1
**         and <AD resolution> is less than 8 bits. In addition, the
**         user code dependency on <AD resolution> is eliminated.
**     Parameters  :
**         NAME            - DESCRIPTION
**         Channel         - Channel number. If only one
**                           channel in the bean is set then this
**                           parameter is ignored.
**       * Value           - Pointer to the measured value.
**     Returns     :
**         ---             - Error code, possible codes:
**                           ERR_OK - OK
**                           ERR_SPEED - This device does not work in
**                           the active speed mode
**                           ERR_NOTAVAIL - Requested value not
**                           available
**                           ERR_RANGE - Parameter "Channel" out of
**                           range
**                           ERR_OVERRUN - External trigger overrun
**                           flag was detected after the last value(s)
**                           was obtained (for example by GetValue).
**                           This error may not be supported on some
**                           CPUs (see generated code).
** ===================================================================
*/
byte AD3_GetChanValue8(byte Channel,byte *Value)
{
  if (!OutFlg) {                       /* Is measured value(s) available? */
    return ERR_NOTAVAIL;
  }
  *Value = AD3_OutV;                   /* Save measured values to the output buffer */
  return ERR_OK;                       /* OK */
}

/*
** ===================================================================
**     Method      :  AD3_Init (bean ADC)
**
**     Description :
**         Initializes the associated peripheral(s) and the bean's 
**         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 AD3_Init(void)
{
  HPRIO = 208;                         /* Set vector with the highest priority */
  EnUser = TRUE;                       /* Enable device */
  OutFlg = FALSE;                      /* No measured value */
  ModeFlg = STOP;                      /* Device isn't running */
  /* ATD1CTL4: SRES8=1,SMP1=1,SMP0=1,PRS4=0,PRS3=1,PRS2=1,PRS1=1,PRS0=0 */
  ATD1CTL4 = 238;                      /* Set resolution, sample time and prescaler */
  /* ATD1CTL3: ??=0,S8C=0,S4C=0,S2C=0,S1C=1,FIFO=0,FRZ1=0,FRZ0=0 */
  ATD1CTL3 = 8;                        /* Set ATD control register 3 */
  /* ATD1CTL2: ADPU=1,AFFC=1,AWAI=0,ETRIGLE=0,ETRIGP=0,ETRIGE=0,ASCIE=1,ASCIF=0 */
  ATD1CTL2 = 194;                      /* Set ATD control register 2 */
}


/* END AD3. */

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