EcalUncalibratedRecHit.cc

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#include "DataFormats/EcalRecHit/interface/EcalUncalibratedRecHit.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include <cmath>



bool EcalUncalibratedRecHit::isSaturated() const {
  return EcalUncalibratedRecHit::checkFlag(kSaturated);
}


float EcalUncalibratedRecHit::jitterError() const
{
        // stored in ps, but return BXs to match with jitter units
        uint32_t jitterErrorBits = 0xFF & aux_;
        // all bits off --> time reco bailed out (return negative value)
        if( (0xFF & jitterErrorBits) == 0x00)
                return -1;
        // all bits on  --> time error over 5 ns (return large value)
        if( (0xFF & jitterErrorBits) == 0xFF)
                return 10000;

        float LSB = 1.26008;
        uint8_t exponent = jitterErrorBits>>5;
        uint8_t significand = jitterErrorBits & ~(0x7<<5);
        return (float)(std::pow(2,exponent)*significand*LSB)/(25.*1000);
}

void EcalUncalibratedRecHit::setJitterError( float jitterErr )
{
        // use 8 bits (3 exp, 5 mant) and store in ps
        // has range of 5 ps - 5000 ps
        // expect input in BX units
        // all bits off --> time reco bailed out
        if(jitterErr < 0)
        {
                aux_ = (~0xFF & aux_);
                return;
        }
        // all bits on  --> time error over 5 ns
        if(25*jitterErr >= 5)
        {
                aux_ = (0xFF | aux_);
                return;
        }

        float LSB = 1.26008;
        float quantityInLSB = (1000*25*jitterErr)/LSB;
        int log2OfQuantity = (int) (log2( quantityInLSB ));
        int exponentTmp = log2OfQuantity - 4;
        uint8_t exponent=0;
        if (exponentTmp>0) exponent = exponentTmp;
        uint8_t significand = (int) ( std::lround( quantityInLSB / std::pow(2,exponent) )   );
        uint32_t jitterErrorBits = exponent<<5 | significand;
  
        if( (0xFF & jitterErrorBits) == 0xFF)
          jitterErrorBits = 0xFE;
        if( (0xFF & jitterErrorBits) == 0x00)
          jitterErrorBits = 0x01;

        aux_ = (~0xFF & aux_) | (jitterErrorBits & 0xFF);

}

bool EcalUncalibratedRecHit::isJitterValid() const
{
        if(jitterError() <= 0)
          return false;
        else
          return true;
}

bool EcalUncalibratedRecHit::isJitterErrorValid() const
{
        if(!isJitterValid())
          return false;
        if(jitterError() >= 10000)
          return false;

        return true;
}

uint8_t EcalUncalibratedRecHit::jitterErrorBits() const
{
        uint8_t jitterErrorBits = 0xFF & aux_;
        return jitterErrorBits;
}


void EcalUncalibratedRecHit::setFlagBit(EcalUncalibratedRecHit::Flags flag){
       if  (flag == kGood) {
          //then set all bits to zero;
          flags_  = 0;
          return;
      }
     // else set the flagbit
     flags_|= 0x1 <<  flag;  
}


bool EcalUncalibratedRecHit::checkFlag(EcalUncalibratedRecHit::Flags flag) const {
       if(flag == kGood){ if ( ! flags_ ) return true;else return false;} // if all flags are unset, then hit is good
       return  flags_ & ( 0x1<<flag);
}