CMSSW_4_4_3_patch1/src/DQM/SiStripMonitorHardware/src/SiStripFEDSpyBuffer.cc

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#include "DQM/SiStripMonitorHardware/interface/SiStripFEDSpyBuffer.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"

namespace sistrip {
  
  const uint8_t FEDSpyBuffer::channelPositionsInData_[FEDCH_PER_DELAY_CHIP] = { 0, 3, 2, 1 };
  
  FEDSpyBuffer::FEDSpyBuffer(const uint8_t* fedBuffer, const size_t fedBufferSize)
    : FEDBufferBase(fedBuffer,fedBufferSize,false),
      payloadPointer_(getPointerToDataAfterTrackerSpecialHeader()+16),
      payloadLength_(getPointerToByteAfterEndOfPayload()-payloadPointer_),
      versionId_(*(getPointerToDataAfterTrackerSpecialHeader()+3))
  {
    //Check it is spy data
    if (!(readoutMode() == READOUT_MODE_SPY))
      throw cms::Exception("FEDSpyBuffer") << "Buffer is not from spy channel";
    //Check the buffer format version ID and take action for any exceptions
    if (versionId_ == 0x00) {
      payloadPointer_ = payloadPointer_-8;
    }
    //find the channel start positions
    findChannels();
  }

  FEDSpyBuffer::~FEDSpyBuffer()
  {
  }

  void FEDSpyBuffer::findChannels()
  {
    size_t delayChipStartByteIndex = 0;
    //Loop over delay chips checking their data fits into buffer and setting up channel objects with correct offset
    for (uint8_t iDelayChip = 0; iDelayChip < DELAY_CHIPS_PER_FED; ++iDelayChip) {
      if (delayChipStartByteIndex+SPY_DELAY_CHIP_BUFFER_SIZE_IN_BYTES > payloadLength_) {
        throw cms::Exception("FEDSpyBuffer") << "Delay chip " << uint16_t(iDelayChip) << " does not fit into buffer. "
                                             << "Buffer size is " << bufferSize() << " delay chip data starts at " << delayChipStartByteIndex+8+8+8+8 << ". ";
      }
      for (uint8_t i = 0; i < FEDCH_PER_DELAY_CHIP; i++) {
        const uint8_t chanelIndexInDataOrder = channelPositionsInData_[i];
        const uint8_t fedCh = iDelayChip*FEDCH_PER_DELAY_CHIP + i;
        const size_t channelOffsetInBits = SPY_DELAYCHIP_DATA_OFFSET_IN_BITS + 10*chanelIndexInDataOrder;
        channels_[fedCh] = FEDChannel(payloadPointer_+delayChipStartByteIndex,channelOffsetInBits,SPY_SAMPLES_PER_CHANNEL);
      }
      delayChipStartByteIndex += SPY_DELAY_CHIP_BUFFER_SIZE_IN_BYTES;
    }
  }

  uint32_t FEDSpyBuffer::globalRunNumber() const
  {
    if (versionId_ < 0x02) {
      return 0;
    }
    const uint8_t * runNumberPointer = getPointerToDataAfterTrackerSpecialHeader()+4;
    uint32_t result = 0;
    result |= runNumberPointer[0];
    result |= (uint32_t(runNumberPointer[1]) << 8);
    result |= (uint32_t(runNumberPointer[2]) << 16);
    result |= (uint32_t(runNumberPointer[3]) << 24);
    return result;
  }

  uint32_t FEDSpyBuffer::spyHeaderL1ID() const
  {
    if (versionId_ == 0x00) {
      return delayChipL1ID(0);
    }
    uint32_t result = 0;
    const uint8_t* spyCounters = payloadPointer_-8;
    result |= spyCounters[4];
    result |= (uint32_t(spyCounters[5]) << 8);
    result |= (uint32_t(spyCounters[6]) << 16);
    result |= (uint32_t(spyCounters[7]) << 24);
    return result;
  }

  uint32_t FEDSpyBuffer::spyHeaderTotalEventCount() const
  {
    if (versionId_ == 0x00) {
      return delayChipTotalEventCount(0);
    }
    uint32_t result = 0;
    const uint8_t* spyCounters = payloadPointer_-8;
    result |= spyCounters[0];
    result |= (uint32_t(spyCounters[1]) << 8);
    result |= (uint32_t(spyCounters[2]) << 16);
    result |= (uint32_t(spyCounters[3]) << 24);
    return result;
  }

  uint32_t FEDSpyBuffer::delayChipL1ID(const uint8_t delayChip) const
  {
    const uint8_t* delayChipCounters = payloadPointer_ + ( (SPY_DELAY_CHIP_BUFFER_SIZE_IN_BYTES) * (delayChip+1) - 8);
    uint32_t result = 0;
    result |= delayChipCounters[4];
    result |= (uint32_t(delayChipCounters[5]) << 8);
    result |= (uint32_t(delayChipCounters[6]) << 16);
    result |= (uint32_t(delayChipCounters[7]) << 24);
    return result;
  }

  uint32_t FEDSpyBuffer::delayChipTotalEventCount(const uint8_t delayChip) const
  {
    const uint8_t* delayChipCounters = payloadPointer_ + ( (SPY_DELAY_CHIP_BUFFER_SIZE_IN_BYTES) * (delayChip+1) - 8);
    uint32_t result = 0;
    result |= delayChipCounters[0];
    result |= (uint32_t(delayChipCounters[1]) << 8);
    result |= (uint32_t(delayChipCounters[2]) << 16);
    result |= (uint32_t(delayChipCounters[3]) << 24);
    return result;
  }

  void FEDSpyBuffer::print(std::ostream& os) const
  {
    FEDBufferBase::print(os);
    //TODO
  }

  bool FEDSpyBuffer::delayChipGood(const uint8_t delayChip) const
  {
    if (versionId_ == 0x00) {
      if (delayChip == 0) return true;
    }
    uint32_t l1CountBefore = 0;
    uint32_t totalEventCountBefore = 0;
    if (delayChip == 0) {
      l1CountBefore = spyHeaderL1ID();
      totalEventCountBefore = spyHeaderTotalEventCount();
    } else {
      l1CountBefore = delayChipL1ID(delayChip-1);
      totalEventCountBefore = delayChipTotalEventCount(delayChip-1);
    }
    const uint32_t l1CountAfter = delayChipL1ID(delayChip);
    const uint32_t totalEventCountAfter = delayChipTotalEventCount(delayChip);
    const bool eventMatches = ( (l1CountBefore == l1CountAfter) && (totalEventCountBefore == totalEventCountAfter) );
    if (!eventMatches) {
      std::ostringstream ss;
      ss << "Delay chip data was overwritten on chip " << uint16_t(delayChip)
         << " L1A before: " << l1CountBefore << " after: " << l1CountAfter
         << " Total event count before: " << totalEventCountBefore << " after: " << totalEventCountAfter << std::endl;
      dump(ss);
      edm::LogInfo("FEDSpyBuffer") << ss.str();
    }
    return eventMatches;
  }

  bool FEDSpyBuffer::channelGood(const uint8_t internalFEDChannelNum) const
  {
    return delayChipGood(internalFEDChannelNum/FEDCH_PER_DELAY_CHIP);
  }




  uint16_t FEDSpyChannelUnpacker::adc() const
  {
    const size_t offsetWords = currentOffset_/32;
    const uint8_t offsetBits = currentOffset_%32;
    if (offsetBits < 23) {
      return ( (data_[offsetWords]>>(32-10-offsetBits)) & 0x3FF );
    } else {
      return ( ((data_[offsetWords]<<(10-32+offsetBits))&0x3FF) | ((data_[offsetWords+1]&(0xFFC00000<<(32-offsetBits)))>>(64-10-offsetBits)) );
    }
  }

}