CSCCFEBTimeSlice.cc

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#include "EventFilter/CSCRawToDigi/interface/CSCCFEBTimeSlice.h"
#include <cassert>
#include <iomanip>
#include <cstdint>

// a Gray code is An ordering of 2n binary numbers such that
// only one bit changes from one entry to the next
// const unsigned layerGrayCode[] = {3,1,5,6,4,2};
const unsigned layerInverseGrayCode[] = {1, 5, 0, 4, 2, 3};
// const unsigned channelGrayCode[] = {0,1,3,2, 6,7,5,4, 12,13,15,14, 10,11,9,8};
const unsigned channelInverseGrayCode[] = {0, 1, 3, 2, 7, 6, 4, 5, 15, 14, 12, 13, 8, 9, 11, 10};

CSCCFEBTimeSlice::CSCCFEBTimeSlice() {
  bzero(this, 99 * 2);
  dummy = 0x7FFF;
  blank_space_1 = 0x7;
  blank_space_3 = 0x7;
}

CSCCFEBSCAControllerWord::CSCCFEBSCAControllerWord(unsigned short frame)
// trig_time( frame & 0xFF ),
// sca_blk( (frame>>8) & 0xF ),
// l1a_phase((frame>>12( & 0x1),
// lct_phase((frame>>13( & 0x1),
// sca_full((frame>>14) & 0x1),
// ts_flag(((frame>>15) & 0x1)
{
  memcpy(this, &frame, 2);
}

CSCCFEBDataWord *CSCCFEBTimeSlice::timeSample(int layer, int channel, bool isDCFEB) const {
  assert(layer >= 1 && layer <= 6);
  assert(channel >= 1 && channel <= 16);
  int layerIndex = layerInverseGrayCode[layer - 1];

  unsigned channelIndex = channelInverseGrayCode[channel - 1];
  if (isDCFEB)
    channelIndex = channel - 1;  
  unsigned scaBin = channelIndex * 6 + layerIndex;
  assert(scaBin < 96U);  // scaBin >= 0, since scaBin is unsigned
  return timeSample(scaBin);
}

CSCCFEBSCAControllerWord CSCCFEBTimeSlice::scaControllerWord(int layer) const {
  unsigned int result = 0;
  for (unsigned i = 0; i < 16; ++i) {
    result |= timeSample(i * 6 + layer - 1)->controllerData << i;
  }
  return CSCCFEBSCAControllerWord(result);
}

void CSCCFEBTimeSlice::setControllerWord(const CSCCFEBSCAControllerWord &controllerWord) {
  for (int layer = 1; layer <= 6; ++layer) {
    for (int channel = 1; channel <= 16; ++channel) {
      const unsigned short *shortWord = reinterpret_cast<const unsigned short *>(&controllerWord);
      timeSample(layer, channel)->controllerData = (*shortWord >> (channel - 1)) & 1;
    }
  }
}

unsigned CSCCFEBTimeSlice::calcCRC() const {
  unsigned CRC = 0;
  for (uint16_t pos = 0; pos < 96; ++pos)
    CRC = (theSamples[pos] & 0x1fff) ^ ((theSamples[pos] & 0x1fff) << 1) ^
          (((CRC & 0x7ffc) >> 2) | ((0x0003 & CRC) << 13)) ^ ((CRC & 0x7ffc) >> 1);
  return CRC;
}

std::ostream &operator<<(std::ostream &os, const CSCCFEBTimeSlice &slice) {
  for (int ichannel = 1; ichannel <= 16; ++ichannel) {
    for (int ilayer = 1; ilayer <= 6; ++ilayer) {
      //unsigned index = (ilayer-1) + (ichannel-1)*6;
      //int value = (slice.timeSample(index))->adcCounts - 560;
      int value = (slice.timeSample(ilayer, ichannel))->adcCounts - 560;
      os << " " << std::setw(5) << std::dec << value;
    }
    os << std::endl;
  }
  return os;
}