CaloTowerPacker.cc

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#include "FWCore/Framework/interface/Event.h"
#include "EventFilter/L1TRawToDigi/plugins/PackerFactory.h"

#include "L1Trigger/L1TCalorimeter/interface/CaloTools.h"

#include "CaloTokens.h"
#include "CaloTowerPacker.h"

namespace l1t {
  namespace stage2 {
    Blocks CaloTowerPacker::pack(const edm::Event& event, const PackerTokens* toks) {
      edm::Handle<CaloTowerBxCollection> towers;
      event.getByToken(static_cast<const CaloTokens*>(toks)->getCaloTowerToken(), towers);

      Blocks res;

      for (int i = towers->getFirstBX(); i <= towers->getLastBX(); ++i) {
        for (int phi = 1; phi <= 72; phi = phi + 2) {  // Two phi values per link

          unsigned int id = 2 * phi - 2;  // Block IDs start at zero and span even numbers up to 142
          std::vector<uint32_t> load;

          for (int eta = 1; eta <= 41; eta++) {  // This is abs(eta) since +/- eta are interleaved in time

            if (eta == CaloTools::kHFBegin)
              continue;

            // Get four towers +/- eta and phi and phi+1 to all be packed in this loop
            l1t::CaloTower t1 = towers->at(i, l1t::CaloTools::caloTowerHash(eta, phi));
            l1t::CaloTower t2 = towers->at(i, l1t::CaloTools::caloTowerHash(eta, phi + 1));
            l1t::CaloTower t3 = towers->at(i, l1t::CaloTools::caloTowerHash(-1 * eta, phi));
            l1t::CaloTower t4 = towers->at(i, l1t::CaloTools::caloTowerHash(-1 * eta, phi + 1));

            // Merge phi and phi+1 into one block (phi is LSW, phi+1 is MSW)
            uint32_t word1 = std::min(t1.hwPt(), 0x1FF) | (t1.hwEtRatio() & 0x7) << 9 | (t1.hwQual() & 0xF) << 12;

            word1 = word1 | std::min(t2.hwPt(), 0x1FF) << 16 | (t2.hwEtRatio() & 0x7) << 25 | (t2.hwQual() & 0xF) << 28;

            load.push_back(word1);

            // Do it all again for -eta

            uint32_t word2 = std::min(t3.hwPt(), 0x1FF) | (t3.hwEtRatio() & 0x7) << 9 | (t3.hwQual() & 0xF) << 12;

            word2 = word2 | std::min(t4.hwPt(), 0x1FF) << 16 | (t4.hwEtRatio() & 0x7) << 25 | (t4.hwQual() & 0xF) << 28;

            load.push_back(word2);
          }

          res.push_back(Block(id, load));
        }
      }
      return res;
    }
  }  // namespace stage2
}  // namespace l1t

DEFINE_L1T_PACKER(l1t::stage2::CaloTowerPacker);