l1t::stage2::EGammaUnpacker Class Reference

Inheritance diagram for l1t::stage2::EGammaUnpacker:

Public Member Functions
virtual bool	unpack (const Block &block, UnpackerCollections *coll) override

Detailed Description

Definition at line 9 of file EGammaUnpacker.cc.

Member Function Documentation

bool l1t::stage2::EGammaUnpacker::unpack ( const Block &  block, UnpackerCollections *  coll  )

overridevirtual

Implements l1t::Unpacker.

Definition at line 21 of file EGammaUnpacker.cc.

References coll, l1t::BlockHeader::getID(), l1t::BlockHeader::getSize(), l1t::Block::header(), l1t::L1Candidate::hwEta(), l1t::L1Candidate::hwIso(), l1t::L1Candidate::hwPhi(), l1t::L1Candidate::hwPt(), l1t::L1Candidate::hwQual(), i, LogDebug, l1t::Block::payload(), l1t::L1Candidate::setHwEta(), l1t::L1Candidate::setHwIso(), l1t::L1Candidate::setHwPhi(), l1t::L1Candidate::setHwPt(), and l1t::L1Candidate::setHwQual().

   {

     LogDebug("L1T") << "Block ID  = " << block.header().getID() << " size = " << block.header().getSize();

     int nBX = int(ceil(block.header().getSize() / 12.)); // Since there are 12 EGamma objects reported per event (see CMS IN-2013/005)

     // Find the central, first and last BXs
     int firstBX = -(ceil((double)nBX/2.)-1);
     int lastBX;
     if (nBX % 2 == 0) {
       lastBX = ceil((double)nBX/2.);
     } else {
       lastBX = ceil((double)nBX/2.)-1;
     }

     auto res_ = static_cast<L1TObjectCollections*>(coll)->getEGammas();
     res_->setBXRange(firstBX, lastBX);

     LogDebug("L1T") << "nBX = " << nBX << " first BX = " << firstBX << " lastBX = " << lastBX;

     // Initialise index
     int unsigned i = 0;

     // Loop over multiple BX and then number of EG cands filling collection
     for (int bx=firstBX; bx<=lastBX; bx++){

       for (unsigned nEG=0; nEG < 12 && nEG < block.header().getSize(); nEG++){

         uint32_t raw_data = block.payload()[i++];

         // skip padding to bring EG candidates up to 12 pre BX
         if (raw_data == 0)
            continue;

         l1t::EGamma eg = l1t::EGamma();
    
         eg.setHwPt(raw_data & 0x1FF);

     int abs_eta = (raw_data >> 9) & 0x7F;
         if ((raw_data >> 16) & 0x1) {
           eg.setHwEta(-1*abs_eta);
         } else {
           eg.setHwEta(abs_eta);
         }

         eg.setHwPhi((raw_data >> 17) & 0xFF);
     eg.setHwIso((raw_data >> 25) & 0x1); // Assume one bit for now?
     eg.setHwQual((raw_data >> 26) & 0x7); // Assume 3 bits for now? leaves 3 spare bits
       
         LogDebug("L1T") << "EG: eta " << eg.hwEta() << " phi " << eg.hwPhi() << " pT " << eg.hwPt() << " iso " << eg.hwIso() << " qual " << eg.hwQual();

         res_->push_back(bx,eg);
       }

     }

     return true;
   }