ScintillatorFirmware Class Reference

FPGA fitter class. More...

#include <ScintillatorFirmware.h>

Public Member Functions
	ScintillatorFirmware (int nPoints)
	Constructor.
	~ScintillatorFirmware ()
	Destructor.
enum ScintillatorFirmwareFitStatus	fit (const int *amp, int threshold, KLMScintillatorFirmwareFitResult *fitData)
	FPGA fitter.

Private Attributes
int	m_nPoints
	Number of points.

Detailed Description

FPGA fitter class.

Definition at line 31 of file ScintillatorFirmware.h.

Constructor & Destructor Documentation

ScintillatorFirmware()

ScintillatorFirmware ( int  nPoints )

explicit

Constructor.

Parameters

[in]

nPoints

Number of points in amplitude arrays.

Definition at line 14 of file ScintillatorFirmware.cc.

                                                         :
  m_nPoints(nPoints)
{
}

~ScintillatorFirmware()

~ScintillatorFirmware

(

)

Destructor.

Definition at line 19 of file ScintillatorFirmware.cc.

{
}

Member Function Documentation

fit()

enum KLM::ScintillatorFirmwareFitStatus fit	(	const int *	amp,
		int	threshold,
		KLMScintillatorFirmwareFitResult *	fitData
	)

FPGA fitter.

Parameters

[in]	amp	Digital amplitude.
[in]	threshold	Threshold.
[out]	fitData	Fit data.

Returns

Fit status.

Definition at line 23 of file ScintillatorFirmware.cc.

{
  /*
   * Upper bound of the background region: number of points before threshold
   * crossing.
   */
  const int nPointsSigBg = 10;
  double bg;
  float sigAmp;
  int i, ithr, ibg, sum, bgSum, min;
  sum = 0;
  bgSum = 0;
  /* Get threshold crossing time, sum of ADC outputs and minimal output. */
  ithr = -1;
  min = 0; /* To avoid warning, re-initialized at the first cycle. */
  for (i = 0; i < m_nPoints; i++) {
    if (amp[i] < threshold) {
      if (ithr < 0)
        ithr = i;
    }
    sum = sum + amp[i];
    if (i == 0)
      min = amp[i];
    else if (amp[i] < min)
      min = amp[i];
  }
  /* No signal. */
  if (ithr < 0)
    return c_ScintillatorFirmwareNoSignal;
  /* Region for background (pedestal) level. */
  ibg = std::max(ithr - nPointsSigBg, 0);
  /* Cannot determine background level, no data before signal. */
  if (ibg == 0)
    return c_ScintillatorFirmwareNoSignal;
  /* Determine background (pedestal) level. */
  for (i = 0; i < ibg; i++)
    bgSum = bgSum + amp[i];
  bg = float(bgSum) / i;
  sigAmp = bg * m_nPoints - sum;
  if (sigAmp < 0)
    sigAmp = 0;
  fitData->setStartTime(ithr);
  fitData->setBackgroundAmplitude(bg);
  fitData->setAmplitude(sigAmp);
  fitData->setMinimalAmplitude(min);
  return c_ScintillatorFirmwareSuccessfulFit;
}

Member Data Documentation

m_nPoints

int m_nPoints

private

Number of points.

Definition at line 58 of file ScintillatorFirmware.h.

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The documentation for this class was generated from the following files:

• klm/simulation/include/ScintillatorFirmware.h
• klm/simulation/src/ScintillatorFirmware.cc