SiStripFEDBufferComponents.h

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#ifndef EventFilter_SiStripRawToDigi_SiStripFEDBufferComponents_H
#define EventFilter_SiStripRawToDigi_SiStripFEDBufferComponents_H

#include <ostream>
#include <memory>
#include <cstring>
#include <vector>
#include "DataFormats/FEDRawData/interface/FEDRawData.h"
#include "DataFormats/SiStripCommon/interface/ConstantsForHardwareSystems.h"
#include "FWCore/Utilities/interface/Exception.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include <cstdint>

namespace sistrip {

  //
  // Constants
  //

  static const uint8_t INVALID = 0xFF;

  static const uint8_t APV_MAX_ADDRESS = 192;

  static const uint16_t SCOPE_MODE_MAX_SCOPE_LENGTH = 1022;

  enum FEDBufferFormat {
    BUFFER_FORMAT_INVALID = INVALID,
    BUFFER_FORMAT_OLD_VME,
    BUFFER_FORMAT_OLD_SLINK,
    BUFFER_FORMAT_NEW
  };
  //these are the values which appear in the buffer.
  static const uint8_t BUFFER_FORMAT_CODE_OLD = 0xED;
  static const uint8_t BUFFER_FORMAT_CODE_NEW = 0xC5;

  //enum values are values which appear in buffer. DO NOT CHANGE!
  enum FEDHeaderType {
    HEADER_TYPE_INVALID = INVALID,
    HEADER_TYPE_FULL_DEBUG = 1,
    HEADER_TYPE_APV_ERROR = 2,
    HEADER_TYPE_NONE = 4  //spy channel
  };

  //enum values are values which appear in buffer. DO NOT CHANGE!
  enum FEDReadoutMode {
    READOUT_MODE_INVALID = INVALID,
    READOUT_MODE_SCOPE = 0x1,
    READOUT_MODE_VIRGIN_RAW = 0x2,
    READOUT_MODE_ZERO_SUPPRESSED_LITE10 = 0x3,
    READOUT_MODE_ZERO_SUPPRESSED_LITE10_CMOVERRIDE = 0x4,
    READOUT_MODE_ZERO_SUPPRESSED_LITE8_TOPBOT = 0x5,
    READOUT_MODE_PROC_RAW = 0x6,
    READOUT_MODE_ZERO_SUPPRESSED_LITE8_TOPBOT_CMOVERRIDE = 0x7,
    READOUT_MODE_ZERO_SUPPRESSED_LITE8_CMOVERRIDE = 0x8,
    READOUT_MODE_ZERO_SUPPRESSED_LITE8_BOTBOT = 0x9,
    READOUT_MODE_ZERO_SUPPRESSED = 0xA,
    READOUT_MODE_ZERO_SUPPRESSED_FAKE = 0xB,
    READOUT_MODE_ZERO_SUPPRESSED_LITE8 = 0xC,
    READOUT_MODE_ZERO_SUPPRESSED_LITE8_BOTBOT_CMOVERRIDE = 0xD,
    READOUT_MODE_SPY = 0xE,
    READOUT_MODE_PREMIX_RAW = 0xF
  };

  enum FEDLegacyReadoutMode {
    READOUT_MODE_LEGACY_INVALID = INVALID,
    READOUT_MODE_LEGACY_SCOPE = 0x1,
    READOUT_MODE_LEGACY_VIRGIN_RAW_REAL = 0x2,
    READOUT_MODE_LEGACY_VIRGIN_RAW_FAKE = 0x3,
    READOUT_MODE_LEGACY_PROC_RAW_REAL = 0x6,
    READOUT_MODE_LEGACY_PROC_RAW_FAKE = 0x7,
    READOUT_MODE_LEGACY_ZERO_SUPPRESSED_REAL = 0xA,
    READOUT_MODE_LEGACY_ZERO_SUPPRESSED_FAKE = 0xB,
    READOUT_MODE_LEGACY_ZERO_SUPPRESSED_LITE_REAL = 0xC,
    READOUT_MODE_LEGACY_ZERO_SUPPRESSED_LITE_FAKE = 0xD,
    READOUT_MODE_LEGACY_SPY = 0xE,
    READOUT_MODE_LEGACY_PREMIX_RAW = 0xF
  };

  static const uint8_t PACKET_CODE_SCOPE = 0xE1;
  static const uint8_t PACKET_CODE_VIRGIN_RAW = 0xE6;
  static const uint8_t PACKET_CODE_VIRGIN_RAW10 = 0x86;
  static const uint8_t PACKET_CODE_VIRGIN_RAW8_BOTBOT = 0xC6;  //FIXME need to implement this!
  static const uint8_t PACKET_CODE_VIRGIN_RAW8_TOPBOT = 0xA6;
  static const uint8_t PACKET_CODE_PROC_RAW = 0xF2;
  static const uint8_t PACKET_CODE_PROC_RAW10 = 0x92;  //FIXME need to implement this!
  static const uint8_t PACKET_CODE_PROC_RAW8_BOTBOT = 0xCA;
  static const uint8_t PACKET_CODE_PROC_RAW8_TOPBOT = 0xB2;
  static const uint8_t PACKET_CODE_ZERO_SUPPRESSED = 0xEA;
  static const uint8_t PACKET_CODE_ZERO_SUPPRESSED10 = 0x8A;
  static const uint8_t PACKET_CODE_ZERO_SUPPRESSED8_BOTBOT = 0xCA;
  static const uint8_t PACKET_CODE_ZERO_SUPPRESSED8_TOPBOT = 0xAA;

  //enum values are values which appear in buffer. DO NOT CHANGE!
  //see http://cmsdoc.cern.ch/cms/TRIDAS/horizontal/RUWG/DAQ_IF_guide/DAQ_IF_guide.html
  enum FEDDAQEventType {
    DAQ_EVENT_TYPE_PHYSICS = 0x1,
    DAQ_EVENT_TYPE_CALIBRATION = 0x2,
    DAQ_EVENT_TYPE_TEST = 0x3,
    DAQ_EVENT_TYPE_TECHNICAL = 0x4,
    DAQ_EVENT_TYPE_SIMULATED = 0x5,
    DAQ_EVENT_TYPE_TRACED = 0x6,
    DAQ_EVENT_TYPE_ERROR = 0xF,
    DAQ_EVENT_TYPE_INVALID = INVALID
  };

  //enum values are values which appear in buffer. DO NOT CHANGE!
  //see http://cmsdoc.cern.ch/cms/TRIDAS/horizontal/RUWG/DAQ_IF_guide/DAQ_IF_guide.html
  enum FEDTTSBits {
    TTS_DISCONNECTED0 = 0x0,
    TTS_WARN_OVERFLOW = 0x1,
    TTS_OUT_OF_SYNC = 0x2,
    TTS_BUSY = 0x4,
    TTS_READY = 0x8,
    TTS_ERROR = 0x12,
    TTS_DISCONNECTED1 = 0xF,
    TTS_INVALID = INVALID
  };

  //enum values are values which appear in buffer. DO NOT CHANGE!
  enum FEDBufferState {
    BUFFER_STATE_UNSET = 0x0,
    BUFFER_STATE_EMPTY = 0x1,
    BUFFER_STATE_PARTIAL_FULL = 0x4,
    BUFFER_STATE_FULL = 0x8
  };

  //enum values are values which appear in buffer. DO NOT CHANGE!
  enum FEDChannelStatus {
    CHANNEL_STATUS_LOCKED = 0x20,
    CHANNEL_STATUS_IN_SYNC = 0x10,
    CHANNEL_STATUS_APV1_ADDRESS_GOOD = 0x08,
    CHANNEL_STATUS_APV0_NO_ERROR_BIT = 0x04,
    CHANNEL_STATUS_APV0_ADDRESS_GOOD = 0x02,
    CHANNEL_STATUS_APV1_NO_ERROR_BIT = 0x01,
    CHANNEL_STATUS_NO_PROBLEMS = CHANNEL_STATUS_LOCKED | CHANNEL_STATUS_IN_SYNC | CHANNEL_STATUS_APV1_ADDRESS_GOOD |
                                 CHANNEL_STATUS_APV0_NO_ERROR_BIT | CHANNEL_STATUS_APV0_ADDRESS_GOOD |
                                 CHANNEL_STATUS_APV1_NO_ERROR_BIT
  };

  enum class FEDBufferStatusCode {
    // for FEDBufferBase
    SUCCESS = 0,
    BUFFER_NULL,
    BUFFER_TOO_SHORT,
    UNRECOGNIZED_FORMAT,
    // for FEDBuffer and FEDSpyBuffer
    EXPECT_NOT_SPY,
    EXPECT_SPY,
    // for FEDBuffer
    WRONG_HEADERTYPE,
    CHANNEL_BEGIN_BEYOND_PAYLOAD,
    CHANNEL_TOO_SHORT,
    CHANNEL_END_BEYOND_PAYLOAD,
  };

  //
  // Global function declarations
  //

  //used by these classes
  uint8_t internalFEDChannelNum(const uint8_t internalFEUnitNum, const uint8_t internalFEUnitChannelNum);
  void printHex(const void* pointer, const size_t length, std::ostream& os);
  //calculate the CRC for a FED buffer
  uint16_t calculateFEDBufferCRC(const uint8_t* buffer, const size_t lengthInBytes);
  //to make enums printable
  std::ostream& operator<<(std::ostream& os, const FEDBufferFormat& value);
  std::ostream& operator<<(std::ostream& os, const FEDHeaderType& value);
  std::ostream& operator<<(std::ostream& os, const FEDLegacyReadoutMode& value);
  std::ostream& operator<<(std::ostream& os, const FEDReadoutMode& value);
  std::ostream& operator<<(std::ostream& os, const FEDDAQEventType& value);
  std::ostream& operator<<(std::ostream& os, const FEDTTSBits& value);
  std::ostream& operator<<(std::ostream& os, const FEDBufferState& value);
  std::ostream& operator<<(std::ostream& os, const FEDChannelStatus& value);
  std::ostream& operator<<(std::ostream& os, const FEDBufferStatusCode& value);
  //convert name of an element of enum to enum value (useful for getting values from config)
  FEDBufferFormat fedBufferFormatFromString(const std::string& bufferFormatString);
  FEDHeaderType fedHeaderTypeFromString(const std::string& headerTypeString);
  FEDReadoutMode fedReadoutModeFromString(const std::string& readoutModeString);
  uint8_t packetCodeFromString(const std::string& packetCodeString, FEDReadoutMode mode);
  FEDDAQEventType fedDAQEventTypeFromString(const std::string& daqEventTypeString);

  //
  // Class definitions
  //

  //handles conversion between order of data in buffer in VR/PR modes (readout order) and strip order (physical order)
  class FEDStripOrdering {
  public:
    //convert strip/sample index in channel (ie 0-255) between physical and readout order
    static uint8_t physicalOrderForStripInChannel(const uint8_t readoutOrderStripIndexInChannel);
    static uint8_t readoutOrderForStripInChannel(const uint8_t physicalOrderStripIndexInChannel);
    //convert strip/sample index in APV (ie 0-127) between physical and readout order
    static uint8_t physicalOrderForStripInAPV(const uint8_t readoutOrderStripIndexInAPV);
    static uint8_t readoutOrderForStripInAPV(const uint8_t physicalOrderStripIndexInAPV);
  };

  //see http://cmsdoc.cern.ch/cms/TRIDAS/horizontal/RUWG/DAQ_IF_guide/DAQ_IF_guide.html
  class FEDDAQHeader {
  public:
    FEDDAQHeader() {}
    explicit FEDDAQHeader(const uint8_t* header);
    //0x5 in first fragment
    uint8_t boeNibble() const;
    uint8_t eventTypeNibble() const;
    FEDDAQEventType eventType() const;
    uint32_t l1ID() const;
    uint16_t bxID() const;
    uint16_t sourceID() const;
    uint8_t version() const;
    //0 if current header word is last, 1 otherwise
    bool hBit() const;
    bool lastHeader() const;
    void print(std::ostream& os) const;
    //used by digi2Raw
    const uint8_t* data() const;
    FEDDAQHeader& setEventType(const FEDDAQEventType evtType);
    FEDDAQHeader& setL1ID(const uint32_t l1ID);
    FEDDAQHeader& setBXID(const uint16_t bxID);
    FEDDAQHeader& setSourceID(const uint16_t sourceID);
    FEDDAQHeader(const uint32_t l1ID,
                 const uint16_t bxID,
                 const uint16_t sourceID,
                 const FEDDAQEventType evtType = DAQ_EVENT_TYPE_PHYSICS);

  private:
    uint8_t header_[8];
  };

  //see http://cmsdoc.cern.ch/cms/TRIDAS/horizontal/RUWG/DAQ_IF_guide/DAQ_IF_guide.html
  class FEDDAQTrailer {
  public:
    FEDDAQTrailer() {}
    explicit FEDDAQTrailer(const uint8_t* trailer);
    //0xA in first fragment
    uint8_t eoeNibble() const;
    uint32_t eventLengthIn64BitWords() const;
    uint32_t eventLengthInBytes() const;
    uint16_t crc() const;
    //set to 1 if FRL detects a transmission error over S-link
    bool cBit() const;
    bool slinkTransmissionError() const { return cBit(); }
    //set to 1 if the FED ID is not the one expected by the FRL
    bool fBit() const;
    bool badSourceID() const { return fBit(); }
    uint8_t eventStatusNibble() const;
    uint8_t ttsNibble() const;
    FEDTTSBits ttsBits() const;
    //0 if the current trailer is the last, 1 otherwise
    bool tBit() const;
    bool lastTrailer() const { return !tBit(); }
    //set to 1 if the S-link sender card detects a CRC error (the CRC it computes is put in the CRC field)
    bool rBit() const;
    bool slinkCRCError() const { return rBit(); }
    void print(std::ostream& os) const;
    //used by digi2Raw
    const uint8_t* data() const;
    FEDDAQTrailer& setEventLengthIn64BitWords(const uint32_t eventLengthIn64BitWords);
    FEDDAQTrailer& setCRC(const uint16_t crc);
    FEDDAQTrailer& setSLinkTransmissionErrorBit(const bool bitSet);
    FEDDAQTrailer& setBadSourceIDBit(const bool bitSet);
    FEDDAQTrailer& setSLinkCRCErrorBit(const bool bitSet);
    FEDDAQTrailer& setEventStatusNibble(const uint8_t eventStatusNibble);
    FEDDAQTrailer& setTTSBits(const FEDTTSBits ttsBits);
    FEDDAQTrailer(const uint32_t eventLengthIn64BitWords,
                  const uint16_t crc = 0,
                  const FEDTTSBits ttsBits = TTS_READY,
                  const bool slinkTransmissionError = false,
                  const bool badFEDID = false,
                  const bool slinkCRCError = false,
                  const uint8_t eventStatusNibble = 0);

  private:
    uint8_t trailer_[8];
  };

  class FEDStatusRegister {
  public:
    FEDStatusRegister(const uint16_t fedStatusRegister);
    bool slinkFullFlag() const;
    bool trackerHeaderMonitorDataReadyFlag() const;
    bool qdrMemoryFullFlag() const;
    bool qdrMemoryPartialFullFlag() const;
    bool qdrMemoryEmptyFlag() const;
    bool l1aBxFIFOFullFlag() const;
    bool l1aBxFIFOPartialFullFlag() const;
    bool l1aBxFIFOEmptyFlag() const;
    FEDBufferState qdrMemoryState() const;
    FEDBufferState l1aBxFIFOState() const;
    bool feDataMissingFlag(const uint8_t internalFEUnitNum) const;
    void print(std::ostream& os) const;
    void printFlags(std::ostream& os) const;
    operator uint16_t() const;
    //used by digi2Raw
    FEDStatusRegister& setSLinkFullFlag(const bool bitSet);
    FEDStatusRegister& setTrackerHeaderMonitorDataReadyFlag(const bool bitSet);
    FEDStatusRegister& setQDRMemoryBufferState(const FEDBufferState state);
    FEDStatusRegister& setL1ABXFIFOBufferState(const FEDBufferState state);
    FEDStatusRegister(const FEDBufferState qdrMemoryBufferState = BUFFER_STATE_UNSET,
                      const FEDBufferState l1aBxFIFOBufferState = BUFFER_STATE_UNSET,
                      const bool trackerHeaderMonitorDataReadyFlagSet = false,
                      const bool slinkFullFlagSet = false);

  private:
    bool getBit(const uint8_t num) const;
    void setBit(const uint8_t num, const bool bitSet);
    void setQDRMemoryFullFlag(const bool bitSet);
    void setQDRMemoryPartialFullFlag(const bool bitSet);
    void setQDRMemoryEmptyFlag(const bool bitSet);
    void setL1ABXFIFOFullFlag(const bool bitSet);
    void setL1ABXFIFOPartialFullFlag(const bool bitSet);
    void setL1ABXFIFOEmptyFlag(const bool bitSet);
    uint16_t data_;
  };

  class TrackerSpecialHeader {
  public:
    TrackerSpecialHeader();
    //construct with a pointer to the data. The data will be coppied and swapped if necessary.
    explicit TrackerSpecialHeader(const uint8_t* headerPointer);
    uint8_t bufferFormatByte() const;
    FEDBufferFormat bufferFormat() const;
    uint8_t headerTypeNibble() const;
    FEDHeaderType headerType() const;
    uint8_t trackerEventTypeNibble() const;
    FEDReadoutMode readoutMode() const;
    FEDLegacyReadoutMode legacyReadoutMode() const;
    uint8_t apveAddress() const;
    uint8_t apvAddressErrorRegister() const;
    bool majorityAddressErrorForFEUnit(const uint8_t internalFEUnitNum) const;
    uint8_t feEnableRegister() const;
    bool feEnabled(const uint8_t internalFEUnitNum) const;
    uint8_t feOverflowRegister() const;
    bool feOverflow(const uint8_t internalFEUnitNum) const;
    uint16_t fedStatusRegisterWord() const;
    FEDStatusRegister fedStatusRegister() const;
    void print(std::ostream& os) const;
    //used by digi2Raw
    //returns ordered buffer (ie this may need to be swapped to get original order)
    const uint8_t* data() const;
    bool wasSwapped() const;
    TrackerSpecialHeader& setBufferFormat(const FEDBufferFormat newBufferFormat);
    TrackerSpecialHeader& setHeaderType(const FEDHeaderType headerType);
    TrackerSpecialHeader& setReadoutMode(const FEDReadoutMode readoutMode);
    TrackerSpecialHeader& setAPVEAddress(const uint8_t address);
    TrackerSpecialHeader& setAPVEAddressErrorRegister(const uint8_t addressErrorRegister);
    TrackerSpecialHeader& setAPVAddressErrorForFEUnit(const uint8_t internalFEUnitNum, const bool error);
    TrackerSpecialHeader& setFEEnableRegister(const uint8_t feEnableRegister);
    TrackerSpecialHeader& setFEEnableForFEUnit(const uint8_t internalFEUnitNum, const bool enabled);
    TrackerSpecialHeader& setFEOverflowRegister(const uint8_t feOverflowRegister);
    TrackerSpecialHeader& setFEOverflowForFEUnit(const uint8_t internalFEUnitNum, const bool overflow);
    TrackerSpecialHeader& setFEDStatusRegister(const FEDStatusRegister fedStatusRegister);
    TrackerSpecialHeader(const FEDBufferFormat bufferFormat,
                         const FEDReadoutMode readoutMode,
                         const FEDHeaderType headerType,
                         const uint8_t address = 0x00,
                         const uint8_t addressErrorRegister = 0x00,
                         const uint8_t feEnableRegister = 0xFF,
                         const uint8_t feOverflowRegister = 0x00,
                         const FEDStatusRegister fedStatusRegister = FEDStatusRegister());

    // detect the buffer format without constructing the full header
    static FEDBufferFormat bufferFormat(const uint8_t* headerPointer) {
      if (headerPointer[BUFFERFORMAT] == BUFFER_FORMAT_CODE_NEW) {
        return BUFFER_FORMAT_NEW;
      } else if (headerPointer[BUFFERFORMAT] == BUFFER_FORMAT_CODE_OLD) {
        return BUFFER_FORMAT_OLD_SLINK;
      } else if (headerPointer[BUFFERFORMAT ^ 4] == BUFFER_FORMAT_CODE_OLD) {
        // same case as used to detect "wordSwapped_" in the constructor
        return BUFFER_FORMAT_OLD_VME;
      } else {
        return BUFFER_FORMAT_INVALID;
      }
    }

  private:
    void setBufferFormatByte(const FEDBufferFormat newBufferFormat);
    void setHeaderTypeNibble(const uint8_t value);
    void setReadoutModeBits(const uint8_t value);
    enum byteIndicies {
      FEDSTATUS = 0,
      FEOVERFLOW = 2,
      FEENABLE = 3,
      ADDRESSERROR = 4,
      APVEADDRESS = 5,
      BUFFERTYPE = 6,
      BUFFERFORMAT = 7
    };
    //copy of header, 32 bit word swapped if needed
    uint8_t specialHeader_[8];
    //was the header word swapped wrt order in buffer?
    bool wordSwapped_;
  };

  class FEDBackendStatusRegister {
  public:
    FEDBackendStatusRegister(const uint32_t backendStatusRegister);
    bool internalFreezeFlag() const;
    bool slinkDownFlag() const;
    bool slinkFullFlag() const;
    bool backpressureFlag() const;
    bool ttcReadyFlag() const;
    bool trackerHeaderMonitorDataReadyFlag() const;
    FEDBufferState qdrMemoryState() const;
    FEDBufferState frameAddressFIFOState() const;
    FEDBufferState totalLengthFIFOState() const;
    FEDBufferState trackerHeaderFIFOState() const;
    FEDBufferState l1aBxFIFOState() const;
    FEDBufferState feEventLengthFIFOState() const;
    FEDBufferState feFPGABufferState() const;
    void print(std::ostream& os) const;
    void printFlags(std::ostream& os) const;
    operator uint32_t() const;
    //used by digi2Raw
    FEDBackendStatusRegister& setInternalFreezeFlag(const bool bitSet);
    FEDBackendStatusRegister& setSLinkDownFlag(const bool bitSet);
    FEDBackendStatusRegister& setSLinkFullFlag(const bool bitSet);
    FEDBackendStatusRegister& setBackpressureFlag(const bool bitSet);
    FEDBackendStatusRegister& setTTCReadyFlag(const bool bitSet);
    FEDBackendStatusRegister& setTrackerHeaderMonitorDataReadyFlag(const bool bitSet);
    FEDBackendStatusRegister& setQDRMemoryState(const FEDBufferState state);
    FEDBackendStatusRegister& setFrameAddressFIFOState(const FEDBufferState state);
    FEDBackendStatusRegister& setTotalLengthFIFOState(const FEDBufferState state);
    FEDBackendStatusRegister& setTrackerHeaderFIFOState(const FEDBufferState state);
    FEDBackendStatusRegister& setL1ABXFIFOState(const FEDBufferState state);
    FEDBackendStatusRegister& setFEEventLengthFIFOState(const FEDBufferState state);
    FEDBackendStatusRegister& setFEFPGABufferState(const FEDBufferState state);
    FEDBackendStatusRegister(const FEDBufferState qdrMemoryBufferState = BUFFER_STATE_UNSET,
                             const FEDBufferState frameAddressFIFOBufferState = BUFFER_STATE_UNSET,
                             const FEDBufferState totalLengthFIFOBufferState = BUFFER_STATE_UNSET,
                             const FEDBufferState trackerHeaderFIFOBufferState = BUFFER_STATE_UNSET,
                             const FEDBufferState l1aBxFIFOBufferState = BUFFER_STATE_UNSET,
                             const FEDBufferState feEventLengthFIFOBufferState = BUFFER_STATE_UNSET,
                             const FEDBufferState feFPGABufferState = BUFFER_STATE_UNSET,
                             const bool backpressure = false,
                             const bool slinkFull = false,
                             const bool slinkDown = false,
                             const bool internalFreeze = false,
                             const bool trackerHeaderMonitorDataReady = false,
                             const bool ttcReady = true);

  private:
    bool getBit(const uint8_t num) const;
    void setBit(const uint8_t num, const bool bitSet);
    //get the state of the buffer in position 'bufferPosition'
    FEDBufferState getBufferState(const uint8_t bufferPosition) const;
    //set the state of the buffer in position 'bufferPosition' to state 'state'
    void setBufferSate(const uint8_t bufferPosition, const FEDBufferState state);
    void printFlagsForBuffer(const FEDBufferState bufferState, const std::string name, std::ostream& os) const;
    //constants marking order of flags in buffer
    //eg. bit offset for L1A/BX FIFO Partial full flag is STATE_OFFSET_PARTIAL_FULL+BUFFER_POSITION_L1ABX_FIFO
    //    bit offset for total length FIFO empty flag is STATE_OFFSET_EMPTY+BUFFER_POSITION_TOTAL_LENGTH_FIFO
    //see BE FPGA technical description
    enum bufferPositions {
      BUFFER_POSITION_QDR_MEMORY = 0,
      BUFFER_POSITION_FRAME_ADDRESS_FIFO = 1,
      BUFFER_POSITION_TOTAL_LENGTH_FIFO = 2,
      BUFFER_POSITION_TRACKER_HEADER_FIFO = 3,
      BUFFER_POSITION_L1ABX_FIFO = 4,
      BUFFER_POSITION_FE_EVENT_LENGTH_FIFO = 5,
      BUFFER_POSITION_FE_FPGA_BUFFER = 6
    };
    enum stateOffsets { STATE_OFFSET_FULL = 8, STATE_OFFSET_PARTIAL_FULL = 16, STATE_OFFSET_EMPTY = 24 };
    uint32_t data_;
  };

  class FEDFEHeader {
  public:
    //factory function: allocates new FEDFEHeader derrivative of appropriate type
    static std::unique_ptr<FEDFEHeader> newFEHeader(const FEDHeaderType headerType, const uint8_t* headerBuffer);
    //used by digi2Raw
    static std::unique_ptr<FEDFEHeader> newFEHeader(const FEDHeaderType headerType);
    //create a buffer to use with digi2Raw
    static std::unique_ptr<FEDFEHeader> newFEFakeHeader(const FEDHeaderType headerType);
    virtual ~FEDFEHeader();
    //the length of the header
    virtual size_t lengthInBytes() const = 0;
    //check that there are no errors indicated in which ever error bits are available in the header
    //check bits for both APVs on a channel
    bool checkChannelStatusBits(const uint8_t internalFEUnitNum, const uint8_t internalFEUnitChannelNum) const;
    virtual bool checkChannelStatusBits(const uint8_t internalFEDChannelNum) const = 0;
    //check bits for one APV
    bool checkStatusBits(const uint8_t internalFEUnitNum,
                         const uint8_t internalFEUnitChannelNum,
                         const uint8_t apvNum) const;
    virtual bool checkStatusBits(const uint8_t internalFEDChannelNum, const uint8_t apvNum) const = 0;
    virtual void print(std::ostream& os) const = 0;
    virtual FEDFEHeader* clone() const = 0;
    //used by digi2Raw
    virtual const uint8_t* data() const = 0;
    virtual void setChannelStatus(const uint8_t internalFEDChannelNum, const FEDChannelStatus status) = 0;
    virtual void setFEUnitMajorityAddress(const uint8_t internalFEUnitNum, const uint8_t address) = 0;
    virtual void setBEStatusRegister(const FEDBackendStatusRegister beStatusRegister) = 0;
    virtual void setDAQRegister(const uint32_t daqRegister) = 0;
    virtual void setDAQRegister2(const uint32_t daqRegister2) = 0;
    virtual void set32BitReservedRegister(const uint8_t internalFEUnitNum, const uint32_t reservedRegister) = 0;
    virtual void setFEUnitLength(const uint8_t internalFEUnitNum, const uint16_t length) = 0;
    void setChannelStatus(const uint8_t internalFEUnitNum,
                          const uint8_t internalFEUnitChannelNum,
                          const FEDChannelStatus status);
  };

  class FEDAPVErrorHeader final : public FEDFEHeader {
  public:
    explicit FEDAPVErrorHeader(const uint8_t* headerBuffer);
    ~FEDAPVErrorHeader() override;
    size_t lengthInBytes() const override;
    bool checkChannelStatusBits(const uint8_t internalFEDChannelNum) const override;
    bool checkStatusBits(const uint8_t internalFEDChannelNum, const uint8_t apvNum) const override;
    void print(std::ostream& os) const override;
    FEDAPVErrorHeader* clone() const override;
    //used by digi2Raw
    const uint8_t* data() const override;
    FEDAPVErrorHeader& setAPVStatusBit(const uint8_t internalFEDChannelNum, const uint8_t apvNum, const bool apvGood);
    FEDAPVErrorHeader& setAPVStatusBit(const uint8_t internalFEUnitNum,
                                       const uint8_t internalFEUnitChannelNum,
                                       const uint8_t apvNum,
                                       const bool apvGood);
    FEDAPVErrorHeader(const std::vector<bool>& apvsGood = std::vector<bool>(APVS_PER_FED, true));
    //Information which is not present in APVError mode is allowed to be set here so that the methods can be called on the base class without caring
    //if the values need to be set.
    void setChannelStatus(const uint8_t internalFEDChannelNum, const FEDChannelStatus status) override;
    void setFEUnitMajorityAddress(const uint8_t internalFEUnitNum, const uint8_t address) override;
    void setBEStatusRegister(const FEDBackendStatusRegister beStatusRegister) override;
    void setDAQRegister(const uint32_t daqRegister) override;
    void setDAQRegister2(const uint32_t daqRegister2) override;
    void set32BitReservedRegister(const uint8_t internalFEUnitNum, const uint32_t reservedRegister) override;
    void setFEUnitLength(const uint8_t internalFEUnitNum, const uint16_t length) override;

  private:
    static const size_t APV_ERROR_HEADER_SIZE_IN_64BIT_WORDS = 3;
    static const size_t APV_ERROR_HEADER_SIZE_IN_BYTES = APV_ERROR_HEADER_SIZE_IN_64BIT_WORDS * 8;
    uint8_t header_[APV_ERROR_HEADER_SIZE_IN_BYTES];
  };

  class FEDFullDebugHeader final : public FEDFEHeader {
  public:
    explicit FEDFullDebugHeader(const uint8_t* headerBuffer);
    ~FEDFullDebugHeader() override;
    size_t lengthInBytes() const override;
    bool checkChannelStatusBits(const uint8_t internalFEDChannelNum) const override;
    bool checkStatusBits(const uint8_t internalFEDChannelNum, const uint8_t apvNum) const override;
    void print(std::ostream& os) const override;
    FEDFullDebugHeader* clone() const override;

    uint8_t feUnitMajorityAddress(const uint8_t internalFEUnitNum) const;
    FEDBackendStatusRegister beStatusRegister() const;
    uint32_t daqRegister() const;
    uint32_t daqRegister2() const;
    uint16_t feUnitLength(const uint8_t internalFEUnitNum) const;
    bool fePresent(const uint8_t internalFEUnitNum) const;

    FEDChannelStatus getChannelStatus(const uint8_t internalFEDChannelNum) const;
    FEDChannelStatus getChannelStatus(const uint8_t internalFEUnitNum, const uint8_t internalFEUnitChannelNum) const;

    //These methods return true if there was an error of the appropriate type (ie if the error bit is 0).
    //They return false if the error could not occur due to a more general error.
    //was channel unlocked
    bool unlocked(const uint8_t internalFEDChannelNum) const;
    bool unlocked(const uint8_t internalFEUnitNum, const uint8_t internalFEUnitChannelNum) const;
    //was channel out of sync if it was unlocked
    bool outOfSync(const uint8_t internalFEDChannelNum) const;
    bool outOfSync(const uint8_t internalFEUnitNum, const uint8_t internalFEUnitChannelNum) const;
    //was there an internal APV error if it was in sync
    bool apvError(const uint8_t internalFEDChannelNum, const uint8_t apvNum) const;
    bool apvError(const uint8_t internalFEUnitNum, const uint8_t internalFEUnitChannelNum, const uint8_t apvNum) const;
    //was the APV address wrong if it was in sync (does not depend on APV internal error bit)
    bool apvAddressError(const uint8_t internalFEDChannelNum, const uint8_t apvNum) const;
    bool apvAddressError(const uint8_t internalFEUnitNum,
                         const uint8_t internalFEUnitChannelNum,
                         const uint8_t apvNum) const;

    //used by digi2Raw
    const uint8_t* data() const override;
    void setChannelStatus(const uint8_t internalFEDChannelNum, const FEDChannelStatus status) override;
    void setFEUnitMajorityAddress(const uint8_t internalFEUnitNum, const uint8_t address) override;
    void setBEStatusRegister(const FEDBackendStatusRegister beStatusRegister) override;
    void setDAQRegister(const uint32_t daqRegister) override;
    void setDAQRegister2(const uint32_t daqRegister2) override;
    void set32BitReservedRegister(const uint8_t internalFEUnitNum, const uint32_t reservedRegister) override;
    void setFEUnitLength(const uint8_t internalFEUnitNum, const uint16_t length) override;
    static uint32_t get32BitWordFrom(const uint8_t* startOfWord);
    uint8_t* feWord(const uint8_t internalFEUnitNum);
    const uint8_t* feWord(const uint8_t internalFEUnitNum) const;
    FEDFullDebugHeader(const std::vector<uint16_t>& feUnitLengths = std::vector<uint16_t>(FEUNITS_PER_FED, 0),
                       const std::vector<uint8_t>& feMajorityAddresses = std::vector<uint8_t>(FEUNITS_PER_FED, 0),
                       const std::vector<FEDChannelStatus>& channelStatus =
                           std::vector<FEDChannelStatus>(FEDCH_PER_FED, CHANNEL_STATUS_NO_PROBLEMS),
                       const FEDBackendStatusRegister beStatusRegister = FEDBackendStatusRegister(),
                       const uint32_t daqRegister = 0,
                       const uint32_t daqRegister2 = 0);

  private:
    bool getBit(const uint8_t internalFEDChannelNum, const uint8_t bit) const;
    static void set32BitWordAt(uint8_t* startOfWord, const uint32_t value);
    void setBit(const uint8_t internalFEDChannelNum, const uint8_t bit, const bool value);

    //These methods return true if there was an error of the appropriate type (ie if the error bit is 0).
    //They ignore any previous errors which make the status bits meaningless and return the value of the bit anyway.
    //In general, the methods above which only return an error for the likely cause are more useful.
    bool unlockedFromBit(const uint8_t internalFEDChannelNum) const;
    bool outOfSyncFromBit(const uint8_t internalFEDChannelNum) const;
    bool apvErrorFromBit(const uint8_t internalFEDChannelNum, const uint8_t apvNum) const;
    bool apvAddressErrorFromBit(const uint8_t internalFEDChannelNum, const uint8_t apvNum) const;

    //following methods set the bits to 1 (no error) if value is false
    void setUnlocked(const uint8_t internalFEDChannelNum, const bool value);
    void setOutOfSync(const uint8_t internalFEDChannelNum, const bool value);
    void setAPVAddressError(const uint8_t internalFEDChannelNum, const uint8_t apvNum, const bool value);
    void setAPVError(const uint8_t internalFEDChannelNum, const uint8_t apvNum, const bool value);
    static const size_t FULL_DEBUG_HEADER_SIZE_IN_64BIT_WORDS = FEUNITS_PER_FED * 2;
    static const size_t FULL_DEBUG_HEADER_SIZE_IN_BYTES = FULL_DEBUG_HEADER_SIZE_IN_64BIT_WORDS * 8;
    uint8_t header_[FULL_DEBUG_HEADER_SIZE_IN_BYTES];
  };

  //holds information about position of a channel in the buffer for use by unpacker
  class FEDChannel {
  public:
    FEDChannel(const uint8_t* const data, const uint32_t offset, const uint16_t length);
    //gets length from first 2 bytes (assuming normal FED channel)
    FEDChannel(const uint8_t* const data, const uint32_t offset);
    uint16_t length() const;
    const uint8_t* data() const;
    uint32_t offset() const;
    uint16_t cmMedian(const uint8_t apvIndex) const;
    //third byte of channel data for normal FED channels
    uint8_t packetCode() const;

  private:
    friend class FEDBuffer;
    const uint8_t* data_;
    uint32_t offset_;
    uint16_t length_;
  };

  //base class for sistrip FED buffers which have a DAQ header/trailer and tracker special header
  class FEDBufferBase {
  public:
    explicit FEDBufferBase(const FEDRawData& fedBuffer);
    virtual ~FEDBufferBase();
    //dump buffer to stream
    void dump(std::ostream& os) const;
    //dump original buffer before word swapping
    void dumpOriginalBuffer(std::ostream& os) const;
    virtual void print(std::ostream& os) const;
    //calculate the CRC from the buffer
    uint16_t calcCRC() const;

    //methods to get parts of the buffer
    FEDDAQHeader daqHeader() const;
    FEDDAQTrailer daqTrailer() const;
    size_t bufferSize() const;
    TrackerSpecialHeader trackerSpecialHeader() const;
    //methods to get info from DAQ header
    FEDDAQEventType daqEventType() const;
    uint32_t daqLvl1ID() const;
    uint16_t daqBXID() const;
    uint16_t daqSourceID() const;
    uint16_t sourceID() const;
    //methods to get info from DAQ trailer
    uint32_t daqEventLengthIn64bitWords() const;
    uint32_t daqEventLengthInBytes() const;
    uint16_t daqCRC() const;
    FEDTTSBits daqTTSState() const;
    //methods to get info from the tracker special header
    FEDBufferFormat bufferFormat() const;
    FEDHeaderType headerType() const;
    FEDLegacyReadoutMode legacyReadoutMode() const;
    FEDReadoutMode readoutMode() const;
    uint8_t packetCode(bool legacy = false, const uint8_t internalFEDChannelNum = 0) const;
    uint8_t apveAddress() const;
    bool majorityAddressErrorForFEUnit(const uint8_t internalFEUnitNum) const;
    bool feEnabled(const uint8_t internalFEUnitNum) const;
    uint8_t nFEUnitsEnabled() const;
    bool feOverflow(const uint8_t internalFEUnitNum) const;
    FEDStatusRegister fedStatusRegister() const;

    //check that channel has no errors
    virtual bool channelGood(const uint8_t internalFEDChannelNum) const;
    bool channelGood(const uint8_t internalFEUnitNum, const uint8_t internalChannelNum) const;
    //return channel object for channel
    const FEDChannel& channel(const uint8_t internalFEDChannelNum) const;
    const FEDChannel& channel(const uint8_t internalFEUnitNum, const uint8_t internalChannelNum) const;

    //summary checks
    //check that tracker special header is valid (does not check for FE unit errors indicated in special header)
    bool doTrackerSpecialHeaderChecks() const;
    //check for errors in DAQ heaqder and trailer (not including bad CRC)
    bool doDAQHeaderAndTrailerChecks() const;
    //do both
    bool doChecks() const;
    //print the result of all detailed checks
    virtual std::string checkSummary() const;

    //detailed checks
    bool checkCRC() const;
    bool checkMajorityAddresses() const;
    //methods to check tracker special header
    bool checkBufferFormat() const;
    bool checkHeaderType() const;
    bool checkReadoutMode() const;
    bool checkAPVEAddressValid() const;
    bool checkNoFEOverflows() const;
    //methods to check daq header and trailer
    bool checkNoSlinkCRCError() const;
    bool checkNoSLinkTransmissionError() const;
    bool checkSourceIDs() const;
    bool checkNoUnexpectedSourceID() const;
    bool checkNoExtraHeadersOrTrailers() const;
    bool checkLengthFromTrailer() const;

  protected:
    const uint8_t* getPointerToDataAfterTrackerSpecialHeader() const;
    const uint8_t* getPointerToByteAfterEndOfPayload() const;
    FEDBufferBase(const FEDRawData& fedBuffer, const bool fillChannelVector);
    std::vector<FEDChannel> channels_;

  private:
    void init();
    const uint8_t* originalBuffer_;
    const uint8_t* orderedBuffer_;
    const size_t bufferSize_;
    FEDDAQHeader daqHeader_;
    FEDDAQTrailer daqTrailer_;
    TrackerSpecialHeader specialHeader_;
  };

  //
  // Inline function definitions
  //

  inline FEDBufferStatusCode preconstructCheckFEDBufferBase(const FEDRawData& fedBuffer,
                                                            bool checkRecognizedFormat = true) {
    if (!fedBuffer.data())
      return FEDBufferStatusCode::BUFFER_NULL;
    //min buffer length. DAQ header, DAQ trailer, tracker special header.
    static const size_t MIN_BUFFER_SIZE = 8 + 8 + 8;
    //check size is non zero
    if (fedBuffer.size() < MIN_BUFFER_SIZE) {
      LogDebug("FEDBuffer") << "Buffer is too small. Min size is " << MIN_BUFFER_SIZE << ". Buffer size is "
                            << fedBuffer.size() << ". ";
      return FEDBufferStatusCode::BUFFER_TOO_SHORT;
    }
    if (checkRecognizedFormat) {
      if (BUFFER_FORMAT_INVALID == TrackerSpecialHeader::bufferFormat(fedBuffer.data() + 8)) {
        LogDebug("FEDBuffer") << "Buffer format not recognized. Tracker special header: "
                              << TrackerSpecialHeader(fedBuffer.data() + 8);
        return FEDBufferStatusCode::UNRECOGNIZED_FORMAT;
      }
    }
    return FEDBufferStatusCode::SUCCESS;
  }

  inline std::ostream& operator<<(std::ostream& os, const FEDBufferBase& obj) {
    obj.print(os);
    os << obj.checkSummary();
    return os;
  }

  inline uint8_t internalFEDChannelNum(const uint8_t internalFEUnitNum, const uint8_t internalFEUnitChannelNum) {
    return (internalFEUnitNum * FEDCH_PER_FEUNIT + internalFEUnitChannelNum);
  }

  inline std::ostream& operator<<(std::ostream& os, const FEDDAQHeader& obj) {
    obj.print(os);
    return os;
  }
  inline std::ostream& operator<<(std::ostream& os, const FEDDAQTrailer& obj) {
    obj.print(os);
    return os;
  }
  inline std::ostream& operator<<(std::ostream& os, const TrackerSpecialHeader& obj) {
    obj.print(os);
    return os;
  }
  inline std::ostream& operator<<(std::ostream& os, const FEDStatusRegister& obj) {
    obj.print(os);
    return os;
  }
  inline std::ostream& operator<<(std::ostream& os, const FEDFEHeader& obj) {
    obj.print(os);
    return os;
  }

  //FEDStripOrdering

  inline uint8_t FEDStripOrdering::physicalOrderForStripInChannel(const uint8_t readoutOrderStripIndexInChannel) {
    return physicalOrderForStripInAPV(readoutOrderStripIndexInChannel / 2) +
           (readoutOrderStripIndexInChannel % 2) * STRIPS_PER_APV;
  }

  inline uint8_t FEDStripOrdering::readoutOrderForStripInChannel(const uint8_t physicalOrderStripIndexInChannel) {
    return (readoutOrderForStripInAPV(physicalOrderStripIndexInChannel % 128) * 2 +
            (physicalOrderStripIndexInChannel / 128));
  }

  inline uint8_t FEDStripOrdering::physicalOrderForStripInAPV(const uint8_t readout_order) {
    return ((32 * (readout_order % 4)) + (8 * static_cast<uint16_t>(static_cast<float>(readout_order) / 4.0)) -
            (31 * static_cast<uint16_t>(static_cast<float>(readout_order) / 16.0)));
  }

  inline uint8_t FEDStripOrdering::readoutOrderForStripInAPV(const uint8_t physical_order) {
    return (4 * ((static_cast<uint16_t>((static_cast<float>(physical_order) / 8.0))) % 4) +
            static_cast<uint16_t>(static_cast<float>(physical_order) / 32.0) + 16 * (physical_order % 8));
  }

  //TrackerSpecialHeader

  inline TrackerSpecialHeader::TrackerSpecialHeader() : wordSwapped_(false) {}

  inline uint8_t TrackerSpecialHeader::bufferFormatByte() const { return specialHeader_[BUFFERFORMAT]; }

  inline uint8_t TrackerSpecialHeader::headerTypeNibble() const { return ((specialHeader_[BUFFERTYPE] & 0xF0) >> 4); }

  inline FEDHeaderType TrackerSpecialHeader::headerType() const {
    const auto nibble = headerTypeNibble();
    switch (nibble) {
      case HEADER_TYPE_FULL_DEBUG:
      case HEADER_TYPE_APV_ERROR:
      case HEADER_TYPE_NONE:
        return FEDHeaderType(nibble);
      default:
        return HEADER_TYPE_INVALID;
    }
  }

  inline uint8_t TrackerSpecialHeader::trackerEventTypeNibble() const { return (specialHeader_[BUFFERTYPE] & 0x0F); }

  inline FEDReadoutMode TrackerSpecialHeader::readoutMode() const {
    const auto nibble = trackerEventTypeNibble();
    //if it is scope mode then return as is (it cannot be fake data)
    //if it is premix then return as is: stripping last bit would make it spy data !
    if ((nibble == READOUT_MODE_SCOPE) || (nibble == READOUT_MODE_PREMIX_RAW))  // 0x or 0xf
      return FEDReadoutMode(nibble);
    //if not then ignore the last bit which indicates if it is real or fake
    else {
      const uint8_t mode = (nibble & 0xF);
      switch (mode) {
        case READOUT_MODE_VIRGIN_RAW:
        case READOUT_MODE_PROC_RAW:
        case READOUT_MODE_ZERO_SUPPRESSED:
        case READOUT_MODE_ZERO_SUPPRESSED_FAKE:
        case READOUT_MODE_ZERO_SUPPRESSED_LITE10:
        //case READOUT_MODE_ZERO_SUPPRESSED_CMOVERRIDE:
        case READOUT_MODE_ZERO_SUPPRESSED_LITE10_CMOVERRIDE:
        case READOUT_MODE_ZERO_SUPPRESSED_LITE8:
        case READOUT_MODE_ZERO_SUPPRESSED_LITE8_CMOVERRIDE:
        case READOUT_MODE_ZERO_SUPPRESSED_LITE8_TOPBOT:
        case READOUT_MODE_ZERO_SUPPRESSED_LITE8_TOPBOT_CMOVERRIDE:
        case READOUT_MODE_ZERO_SUPPRESSED_LITE8_BOTBOT:
        case READOUT_MODE_ZERO_SUPPRESSED_LITE8_BOTBOT_CMOVERRIDE:
        case READOUT_MODE_SPY:
          return FEDReadoutMode(mode);
        default:
          return READOUT_MODE_INVALID;
      }
    }
  }

  inline uint8_t TrackerSpecialHeader::apveAddress() const { return specialHeader_[APVEADDRESS]; }

  inline uint8_t TrackerSpecialHeader::apvAddressErrorRegister() const { return specialHeader_[ADDRESSERROR]; }

  inline bool TrackerSpecialHeader::majorityAddressErrorForFEUnit(const uint8_t internalFEUnitNum) const {
    return (!(readoutMode() == READOUT_MODE_SCOPE) && !((0x1 << internalFEUnitNum) & apvAddressErrorRegister()));
  }

  inline uint8_t TrackerSpecialHeader::feEnableRegister() const { return specialHeader_[FEENABLE]; }

  inline bool TrackerSpecialHeader::feEnabled(const uint8_t internalFEUnitNum) const {
    return ((0x1 << internalFEUnitNum) & feEnableRegister());
  }

  inline uint8_t TrackerSpecialHeader::feOverflowRegister() const { return specialHeader_[FEOVERFLOW]; }

  inline bool TrackerSpecialHeader::feOverflow(const uint8_t internalFEUnitNum) const {
    return ((0x1 << internalFEUnitNum) & feOverflowRegister());
  }

  inline uint16_t TrackerSpecialHeader::fedStatusRegisterWord() const {
    //get 16 bits
    uint16_t statusRegister = ((specialHeader_[(FEDSTATUS + 1)] << 8) | specialHeader_[FEDSTATUS]);
    return statusRegister;
  }

  inline FEDStatusRegister TrackerSpecialHeader::fedStatusRegister() const {
    return FEDStatusRegister(fedStatusRegisterWord());
  }

  inline void TrackerSpecialHeader::print(std::ostream& os) const { printHex(specialHeader_, 8, os); }

  inline const uint8_t* TrackerSpecialHeader::data() const { return specialHeader_; }

  inline bool TrackerSpecialHeader::wasSwapped() const { return wordSwapped_; }

  inline void TrackerSpecialHeader::setHeaderTypeNibble(const uint8_t value) {
    specialHeader_[BUFFERTYPE] = ((specialHeader_[BUFFERTYPE] & 0x0F) | ((value << 4) & 0xF0));
  }

  inline void TrackerSpecialHeader::setReadoutModeBits(const uint8_t value) {
    specialHeader_[BUFFERTYPE] = ((specialHeader_[BUFFERTYPE] & (~0x0F)) | (value & 0x0F));
  }

  inline TrackerSpecialHeader& TrackerSpecialHeader::setAPVEAddress(const uint8_t address) {
    specialHeader_[APVEADDRESS] = address;
    return *this;
  }

  inline TrackerSpecialHeader& TrackerSpecialHeader::setAPVEAddressErrorRegister(const uint8_t addressErrorRegister) {
    specialHeader_[ADDRESSERROR] = addressErrorRegister;
    return *this;
  }

  inline TrackerSpecialHeader& TrackerSpecialHeader::setFEEnableRegister(const uint8_t feEnableRegister) {
    specialHeader_[FEENABLE] = feEnableRegister;
    return *this;
  }

  inline TrackerSpecialHeader& TrackerSpecialHeader::setFEOverflowRegister(const uint8_t feOverflowRegister) {
    specialHeader_[FEOVERFLOW] = feOverflowRegister;
    return *this;
  }

  inline TrackerSpecialHeader& TrackerSpecialHeader::setFEDStatusRegister(const FEDStatusRegister fedStatusRegister) {
    specialHeader_[FEDSTATUS] = (static_cast<uint16_t>(fedStatusRegister) & 0x00FF);
    specialHeader_[FEDSTATUS + 1] = ((static_cast<uint16_t>(fedStatusRegister) & 0xFF00) >> 8);
    return *this;
  }

  //FEDStatusRegister

  inline FEDStatusRegister::FEDStatusRegister(const uint16_t fedStatusRegister) : data_(fedStatusRegister) {}

  inline FEDStatusRegister::operator uint16_t() const { return data_; }

  inline bool FEDStatusRegister::getBit(const uint8_t num) const { return ((0x1 << num) & (data_)); }

  inline bool FEDStatusRegister::slinkFullFlag() const { return getBit(0); }

  inline bool FEDStatusRegister::trackerHeaderMonitorDataReadyFlag() const { return getBit(1); }

  inline bool FEDStatusRegister::qdrMemoryFullFlag() const { return getBit(2); }

  inline bool FEDStatusRegister::qdrMemoryPartialFullFlag() const { return getBit(3); }

  inline bool FEDStatusRegister::qdrMemoryEmptyFlag() const { return getBit(4); }

  inline bool FEDStatusRegister::l1aBxFIFOFullFlag() const { return getBit(5); }

  inline bool FEDStatusRegister::l1aBxFIFOPartialFullFlag() const { return getBit(6); }

  inline bool FEDStatusRegister::l1aBxFIFOEmptyFlag() const { return getBit(7); }

  inline bool FEDStatusRegister::feDataMissingFlag(const uint8_t internalFEUnitNum) const {
    return getBit(8 + internalFEUnitNum);
  }

  inline void FEDStatusRegister::print(std::ostream& os) const { printHex(&data_, 2, os); }

  inline FEDStatusRegister& FEDStatusRegister::setSLinkFullFlag(const bool bitSet) {
    setBit(0, bitSet);
    return *this;
  }

  inline FEDStatusRegister& FEDStatusRegister::setTrackerHeaderMonitorDataReadyFlag(const bool bitSet) {
    setBit(1, bitSet);
    return *this;
  }

  inline void FEDStatusRegister::setQDRMemoryFullFlag(const bool bitSet) { setBit(2, bitSet); }

  inline void FEDStatusRegister::setQDRMemoryPartialFullFlag(const bool bitSet) { setBit(3, bitSet); }

  inline void FEDStatusRegister::setQDRMemoryEmptyFlag(const bool bitSet) { setBit(4, bitSet); }

  inline void FEDStatusRegister::setL1ABXFIFOFullFlag(const bool bitSet) { setBit(5, bitSet); }

  inline void FEDStatusRegister::setL1ABXFIFOPartialFullFlag(const bool bitSet) { setBit(6, bitSet); }

  inline void FEDStatusRegister::setL1ABXFIFOEmptyFlag(const bool bitSet) { setBit(7, bitSet); }

  inline FEDStatusRegister::FEDStatusRegister(const FEDBufferState qdrMemoryBufferState,
                                              const FEDBufferState l1aBxFIFOBufferState,
                                              const bool trackerHeaderMonitorDataReadyFlagSet,
                                              const bool slinkFullFlagSet)
      : data_(0x0000) {
    setSLinkFullFlag(slinkFullFlagSet);
    setTrackerHeaderMonitorDataReadyFlag(trackerHeaderMonitorDataReadyFlagSet);
    setQDRMemoryBufferState(qdrMemoryBufferState);
    setL1ABXFIFOBufferState(l1aBxFIFOBufferState);
  }

  //FEDBackendStatusRegister

  inline FEDBackendStatusRegister::FEDBackendStatusRegister(const uint32_t backendStatusRegister)
      : data_(backendStatusRegister) {}

  inline FEDBackendStatusRegister::operator uint32_t() const { return data_; }

  inline void FEDBackendStatusRegister::print(std::ostream& os) const { printHex(&data_, 4, os); }

  inline bool FEDBackendStatusRegister::getBit(const uint8_t num) const { return ((0x1 << num) & (data_)); }

  inline bool FEDBackendStatusRegister::internalFreezeFlag() const { return getBit(1); }

  inline bool FEDBackendStatusRegister::slinkDownFlag() const { return getBit(2); }

  inline bool FEDBackendStatusRegister::slinkFullFlag() const { return getBit(3); }

  inline bool FEDBackendStatusRegister::backpressureFlag() const { return getBit(4); }

  inline bool FEDBackendStatusRegister::ttcReadyFlag() const { return getBit(6); }

  inline bool FEDBackendStatusRegister::trackerHeaderMonitorDataReadyFlag() const { return getBit(7); }

  inline FEDBackendStatusRegister& FEDBackendStatusRegister::setInternalFreezeFlag(const bool bitSet) {
    setBit(1, bitSet);
    return *this;
  }

  inline FEDBackendStatusRegister& FEDBackendStatusRegister::setSLinkDownFlag(const bool bitSet) {
    setBit(2, bitSet);
    return *this;
  }

  inline FEDBackendStatusRegister& FEDBackendStatusRegister::setSLinkFullFlag(const bool bitSet) {
    setBit(3, bitSet);
    return *this;
  }

  inline FEDBackendStatusRegister& FEDBackendStatusRegister::setBackpressureFlag(const bool bitSet) {
    setBit(4, bitSet);
    return *this;
  }

  inline FEDBackendStatusRegister& FEDBackendStatusRegister::setTTCReadyFlag(const bool bitSet) {
    setBit(6, bitSet);
    return *this;
  }

  inline FEDBackendStatusRegister& FEDBackendStatusRegister::setTrackerHeaderMonitorDataReadyFlag(const bool bitSet) {
    setBit(7, bitSet);
    return *this;
  }

  inline FEDBufferState FEDBackendStatusRegister::qdrMemoryState() const {
    return getBufferState(BUFFER_POSITION_QDR_MEMORY);
  }

  inline FEDBufferState FEDBackendStatusRegister::frameAddressFIFOState() const {
    return getBufferState(BUFFER_POSITION_FRAME_ADDRESS_FIFO);
  }

  inline FEDBufferState FEDBackendStatusRegister::totalLengthFIFOState() const {
    return getBufferState(BUFFER_POSITION_TOTAL_LENGTH_FIFO);
  }

  inline FEDBufferState FEDBackendStatusRegister::trackerHeaderFIFOState() const {
    return getBufferState(BUFFER_POSITION_TRACKER_HEADER_FIFO);
  }

  inline FEDBufferState FEDBackendStatusRegister::l1aBxFIFOState() const {
    return getBufferState(BUFFER_POSITION_L1ABX_FIFO);
  }

  inline FEDBufferState FEDBackendStatusRegister::feEventLengthFIFOState() const {
    return getBufferState(BUFFER_POSITION_FE_EVENT_LENGTH_FIFO);
  }

  inline FEDBufferState FEDBackendStatusRegister::feFPGABufferState() const {
    return getBufferState(BUFFER_POSITION_FE_FPGA_BUFFER);
  }

  inline FEDBackendStatusRegister& FEDBackendStatusRegister::setQDRMemoryState(const FEDBufferState state) {
    setBufferSate(BUFFER_POSITION_QDR_MEMORY, state);
    return *this;
  }

  inline FEDBackendStatusRegister& FEDBackendStatusRegister::setFrameAddressFIFOState(const FEDBufferState state) {
    setBufferSate(BUFFER_POSITION_FRAME_ADDRESS_FIFO, state);
    return *this;
  }

  inline FEDBackendStatusRegister& FEDBackendStatusRegister::setTotalLengthFIFOState(const FEDBufferState state) {
    setBufferSate(BUFFER_POSITION_TOTAL_LENGTH_FIFO, state);
    return *this;
  }

  inline FEDBackendStatusRegister& FEDBackendStatusRegister::setTrackerHeaderFIFOState(const FEDBufferState state) {
    setBufferSate(BUFFER_POSITION_TRACKER_HEADER_FIFO, state);
    return *this;
  }

  inline FEDBackendStatusRegister& FEDBackendStatusRegister::setL1ABXFIFOState(const FEDBufferState state) {
    setBufferSate(BUFFER_POSITION_L1ABX_FIFO, state);
    return *this;
  }

  inline FEDBackendStatusRegister& FEDBackendStatusRegister::setFEEventLengthFIFOState(const FEDBufferState state) {
    setBufferSate(BUFFER_POSITION_FE_EVENT_LENGTH_FIFO, state);
    return *this;
  }

  inline FEDBackendStatusRegister& FEDBackendStatusRegister::setFEFPGABufferState(const FEDBufferState state) {
    setBufferSate(BUFFER_POSITION_FE_FPGA_BUFFER, state);
    return *this;
  }

  //FEDFEHeader

  inline std::unique_ptr<FEDFEHeader> FEDFEHeader::newFEHeader(const FEDHeaderType headerType,
                                                               const uint8_t* headerBuffer) {
    switch (headerType) {
      case HEADER_TYPE_FULL_DEBUG:
        return std::unique_ptr<FEDFEHeader>(new FEDFullDebugHeader(headerBuffer));
      case HEADER_TYPE_APV_ERROR:
        return std::unique_ptr<FEDFEHeader>(new FEDAPVErrorHeader(headerBuffer));
      default:
        return std::unique_ptr<FEDFEHeader>();
    }
  }

  inline std::unique_ptr<FEDFEHeader> FEDFEHeader::newFEHeader(const FEDHeaderType headerType) {
    switch (headerType) {
      case HEADER_TYPE_FULL_DEBUG:
        return std::unique_ptr<FEDFEHeader>(new FEDFullDebugHeader());
      case HEADER_TYPE_APV_ERROR:
        return std::unique_ptr<FEDFEHeader>(new FEDAPVErrorHeader());
      default:
        return std::unique_ptr<FEDFEHeader>();
    }
  }

  inline std::unique_ptr<FEDFEHeader> FEDFEHeader::newFEFakeHeader(const FEDHeaderType headerType) {
    switch (headerType) {
      case HEADER_TYPE_FULL_DEBUG:
        return std::unique_ptr<FEDFEHeader>(new FEDFullDebugHeader);
      case HEADER_TYPE_APV_ERROR:
        return std::unique_ptr<FEDFEHeader>(new FEDAPVErrorHeader);
      default:
        return std::unique_ptr<FEDFEHeader>();
    }
  }

  inline bool FEDFEHeader::checkChannelStatusBits(const uint8_t internalFEUnitNum,
                                                  const uint8_t internalFEUnitChannelNum) const {
    return checkChannelStatusBits(internalFEDChannelNum(internalFEUnitNum, internalFEUnitChannelNum));
  }

  inline bool FEDFEHeader::checkStatusBits(const uint8_t internalFEUnitNum,
                                           const uint8_t internalFEUnitChannelNum,
                                           const uint8_t apvNum) const {
    return checkStatusBits(internalFEDChannelNum(internalFEUnitNum, internalFEUnitChannelNum), apvNum);
  }

  inline void FEDFEHeader::setChannelStatus(const uint8_t internalFEUnitNum,
                                            const uint8_t internalFEUnitChannelNum,
                                            const FEDChannelStatus status) {
    this->setChannelStatus(internalFEDChannelNum(internalFEUnitNum, internalFEUnitChannelNum), status);
  }

  inline FEDAPVErrorHeader::FEDAPVErrorHeader(const uint8_t* headerBuffer) {
    memcpy(header_, headerBuffer, APV_ERROR_HEADER_SIZE_IN_BYTES);
  }

  inline FEDAPVErrorHeader& FEDAPVErrorHeader::setAPVStatusBit(const uint8_t internalFEUnitNum,
                                                               const uint8_t internalFEUnitChannelNum,
                                                               const uint8_t apvNum,
                                                               const bool apvGood) {
    return setAPVStatusBit(internalFEDChannelNum(internalFEUnitNum, internalFEUnitChannelNum), apvNum, apvGood);
  }

  inline FEDFullDebugHeader::FEDFullDebugHeader(const uint8_t* headerBuffer) {
    memcpy(header_, headerBuffer, FULL_DEBUG_HEADER_SIZE_IN_BYTES);
  }

  inline uint8_t FEDFullDebugHeader::feUnitMajorityAddress(const uint8_t internalFEUnitNum) const {
    return feWord(internalFEUnitNum)[9];
  }

  inline FEDBackendStatusRegister FEDFullDebugHeader::beStatusRegister() const {
    return FEDBackendStatusRegister(get32BitWordFrom(feWord(0) + 10));
  }

  inline uint32_t FEDFullDebugHeader::daqRegister() const { return get32BitWordFrom(feWord(7) + 10); }

  inline uint32_t FEDFullDebugHeader::daqRegister2() const { return get32BitWordFrom(feWord(6) + 10); }

  inline uint16_t FEDFullDebugHeader::feUnitLength(const uint8_t internalFEUnitNum) const {
    return ((feWord(internalFEUnitNum)[15] << 8) | (feWord(internalFEUnitNum)[14]));
  }

  inline bool FEDFullDebugHeader::fePresent(const uint8_t internalFEUnitNum) const {
    return (feUnitLength(internalFEUnitNum) != 0);
  }

  inline bool FEDFullDebugHeader::unlocked(const uint8_t internalFEDChannelNum) const {
    return unlockedFromBit(internalFEDChannelNum);
  }

  inline bool FEDFullDebugHeader::unlocked(const uint8_t internalFEUnitNum,
                                           const uint8_t internalFEUnitChannelNum) const {
    return unlocked(internalFEDChannelNum(internalFEUnitNum, internalFEUnitChannelNum));
  }

  inline bool FEDFullDebugHeader::outOfSync(const uint8_t internalFEDChannelNum) const {
    return (!unlocked(internalFEDChannelNum) && outOfSyncFromBit(internalFEDChannelNum));
  }

  inline bool FEDFullDebugHeader::outOfSync(const uint8_t internalFEUnitNum,
                                            const uint8_t internalFEUnitChannelNum) const {
    return outOfSync(internalFEDChannelNum(internalFEUnitNum, internalFEUnitChannelNum));
  }

  inline bool FEDFullDebugHeader::apvError(const uint8_t internalFEDChannelNum, const uint8_t apvNum) const {
    return (!unlockedFromBit(internalFEDChannelNum) && !outOfSyncFromBit(internalFEDChannelNum) &&
            apvErrorFromBit(internalFEDChannelNum, apvNum));
  }

  inline bool FEDFullDebugHeader::apvError(const uint8_t internalFEUnitNum,
                                           const uint8_t internalFEUnitChannelNum,
                                           const uint8_t apvNum) const {
    return apvError(internalFEDChannelNum(internalFEUnitNum, internalFEUnitChannelNum), apvNum);
  }

  inline bool FEDFullDebugHeader::apvAddressError(const uint8_t internalFEDChannelNum, const uint8_t apvNum) const {
    return (!unlockedFromBit(internalFEDChannelNum) && !outOfSyncFromBit(internalFEDChannelNum) &&
            apvAddressErrorFromBit(internalFEDChannelNum, apvNum));
  }

  inline bool FEDFullDebugHeader::apvAddressError(const uint8_t internalFEUnitNum,
                                                  const uint8_t internalFEUnitChannelNum,
                                                  const uint8_t apvNum) const {
    return apvAddressError(internalFEDChannelNum(internalFEUnitNum, internalFEUnitChannelNum), apvNum);
  }

  inline FEDChannelStatus FEDFullDebugHeader::getChannelStatus(const uint8_t internalFEUnitNum,
                                                               const uint8_t internalFEUnitChannelNum) const {
    return getChannelStatus(internalFEDChannelNum(internalFEUnitNum, internalFEUnitChannelNum));
  }

  inline bool FEDFullDebugHeader::unlockedFromBit(const uint8_t internalFEDChannelNum) const {
    return !getBit(internalFEDChannelNum, 5);
  }

  inline bool FEDFullDebugHeader::outOfSyncFromBit(const uint8_t internalFEDChannelNum) const {
    return !getBit(internalFEDChannelNum, 4);
  }

  inline bool FEDFullDebugHeader::apvErrorFromBit(const uint8_t internalFEDChannelNum, const uint8_t apvNum) const {
    //Discovered March 2012: two bits inverted in firmware. Decided
    //to update documentation but keep firmware identical for
    //backward compatibility. So status bit order is actually:
    //apvErr1 - apvAddrErr0 - apvErr0 - apvAddrErr1 - OOS - unlocked.
    //Before, it was: return !getBit(internalFEDChannelNum,0+2*apvNum);

    return !getBit(internalFEDChannelNum, 0 + 2 * (1 - apvNum));
  }

  inline bool FEDFullDebugHeader::apvAddressErrorFromBit(const uint8_t internalFEDChannelNum,
                                                         const uint8_t apvNum) const {
    return !getBit(internalFEDChannelNum, 1 + 2 * apvNum);
  }

  inline bool FEDFullDebugHeader::getBit(const uint8_t internalFEDChannelNum, const uint8_t bit) const {
    const uint8_t* pFEWord = feWord(internalFEDChannelNum / FEDCH_PER_FEUNIT);
    const uint8_t bitInFeWord = ((FEDCH_PER_FEUNIT - 1) - (internalFEDChannelNum % FEDCH_PER_FEUNIT)) * 6 + bit;
    return (pFEWord[bitInFeWord / 8] & (0x1 << (bitInFeWord % 8)));
  }

  inline uint32_t FEDFullDebugHeader::get32BitWordFrom(const uint8_t* startOfWord) {
    return (startOfWord[0] | (startOfWord[1] << 8) | (startOfWord[2] << 16) | (startOfWord[3] << 24));
  }

  inline void FEDFullDebugHeader::set32BitWordAt(uint8_t* startOfWord, const uint32_t value) {
    memcpy(startOfWord, &value, 4);
  }

  inline const uint8_t* FEDFullDebugHeader::feWord(const uint8_t internalFEUnitNum) const {
    return header_ + internalFEUnitNum * 2 * 8;
  }

  //re-use const method
  inline uint8_t* FEDFullDebugHeader::feWord(const uint8_t internalFEUnitNum) {
    return const_cast<uint8_t*>(std::as_const(*this).feWord(internalFEUnitNum));
  }

  inline void FEDFullDebugHeader::setUnlocked(const uint8_t internalFEDChannelNum, const bool value) {
    setBit(internalFEDChannelNum, 5, !value);
  }

  inline void FEDFullDebugHeader::setOutOfSync(const uint8_t internalFEDChannelNum, const bool value) {
    setBit(internalFEDChannelNum, 4, !value);
  }

  inline void FEDFullDebugHeader::setAPVAddressError(const uint8_t internalFEDChannelNum,
                                                     const uint8_t apvNum,
                                                     const bool value) {
    setBit(internalFEDChannelNum, 1 + 2 * apvNum, !value);
  }

  inline void FEDFullDebugHeader::setAPVError(const uint8_t internalFEDChannelNum,
                                              const uint8_t apvNum,
                                              const bool value) {
    //Discovered March 2012: two bits inverted in firmware. Decided
    //to update documentation but keep firmware identical for
    //backward compatibility. So status bit order is actually:
    //apvErr1 - apvAddrErr0 - apvErr0 - apvAddrErr1 - OOS - unlocked.
    //Before, it was: return !getBit(internalFEDChannelNum,0+2*apvNum);

    setBit(internalFEDChannelNum, 0 + 2 * (1 - apvNum), !value);
  }

  //FEDDAQHeader

  inline FEDDAQHeader::FEDDAQHeader(const uint8_t* header) { memcpy(header_, header, 8); }

  inline uint8_t FEDDAQHeader::boeNibble() const { return ((header_[7] & 0xF0) >> 4); }

  inline uint8_t FEDDAQHeader::eventTypeNibble() const { return (header_[7] & 0x0F); }

  inline uint32_t FEDDAQHeader::l1ID() const { return (header_[4] | (header_[5] << 8) | (header_[6] << 16)); }

  inline uint16_t FEDDAQHeader::bxID() const { return ((header_[3] << 4) | ((header_[2] & 0xF0) >> 4)); }

  inline uint16_t FEDDAQHeader::sourceID() const { return (((header_[2] & 0x0F) << 8) | header_[1]); }

  inline uint8_t FEDDAQHeader::version() const { return ((header_[0] & 0xF0) >> 4); }

  inline bool FEDDAQHeader::hBit() const { return (header_[0] & 0x8); }

  inline bool FEDDAQHeader::lastHeader() const { return !hBit(); }

  inline const uint8_t* FEDDAQHeader::data() const { return header_; }

  inline void FEDDAQHeader::print(std::ostream& os) const { printHex(header_, 8, os); }

  //FEDDAQTrailer

  inline FEDDAQTrailer::FEDDAQTrailer(const uint8_t* trailer) { memcpy(trailer_, trailer, 8); }

  inline uint8_t FEDDAQTrailer::eoeNibble() const { return ((trailer_[7] & 0xF0) >> 4); }

  inline uint32_t FEDDAQTrailer::eventLengthIn64BitWords() const {
    return (trailer_[4] | (trailer_[5] << 8) | (trailer_[6] << 16));
  }

  inline uint32_t FEDDAQTrailer::eventLengthInBytes() const { return eventLengthIn64BitWords() * 8; }

  inline uint16_t FEDDAQTrailer::crc() const { return (trailer_[2] | (trailer_[3] << 8)); }

  inline bool FEDDAQTrailer::cBit() const { return (trailer_[1] & 0x80); }

  inline bool FEDDAQTrailer::fBit() const { return (trailer_[1] & 0x40); }

  inline uint8_t FEDDAQTrailer::eventStatusNibble() const { return (trailer_[1] & 0x0F); }

  inline uint8_t FEDDAQTrailer::ttsNibble() const { return ((trailer_[0] & 0xF0) >> 4); }

  inline bool FEDDAQTrailer::tBit() const { return (trailer_[0] & 0x08); }

  inline bool FEDDAQTrailer::rBit() const { return (trailer_[0] & 0x04); }

  inline void FEDDAQTrailer::print(std::ostream& os) const { printHex(trailer_, 8, os); }

  inline const uint8_t* FEDDAQTrailer::data() const { return trailer_; }

  //FEDBufferBase

  inline void FEDBufferBase::dump(std::ostream& os) const { printHex(orderedBuffer_, bufferSize_, os); }

  inline void FEDBufferBase::dumpOriginalBuffer(std::ostream& os) const { printHex(originalBuffer_, bufferSize_, os); }

  inline uint16_t FEDBufferBase::calcCRC() const { return calculateFEDBufferCRC(orderedBuffer_, bufferSize_); }

  inline FEDDAQHeader FEDBufferBase::daqHeader() const { return daqHeader_; }

  inline FEDDAQTrailer FEDBufferBase::daqTrailer() const { return daqTrailer_; }

  inline size_t FEDBufferBase::bufferSize() const { return bufferSize_; }

  inline TrackerSpecialHeader FEDBufferBase::trackerSpecialHeader() const { return specialHeader_; }

  inline FEDDAQEventType FEDBufferBase::daqEventType() const { return daqHeader_.eventType(); }

  inline uint32_t FEDBufferBase::daqLvl1ID() const { return daqHeader_.l1ID(); }

  inline uint16_t FEDBufferBase::daqBXID() const { return daqHeader_.bxID(); }

  inline uint16_t FEDBufferBase::daqSourceID() const { return daqHeader_.sourceID(); }

  inline uint32_t FEDBufferBase::daqEventLengthIn64bitWords() const { return daqTrailer_.eventLengthIn64BitWords(); }

  inline uint32_t FEDBufferBase::daqEventLengthInBytes() const { return daqTrailer_.eventLengthInBytes(); }

  inline uint16_t FEDBufferBase::daqCRC() const { return daqTrailer_.crc(); }

  inline FEDTTSBits FEDBufferBase::daqTTSState() const { return daqTrailer_.ttsBits(); }

  inline FEDBufferFormat FEDBufferBase::bufferFormat() const { return specialHeader_.bufferFormat(); }

  inline FEDHeaderType FEDBufferBase::headerType() const { return specialHeader_.headerType(); }

  inline FEDLegacyReadoutMode FEDBufferBase::legacyReadoutMode() const { return specialHeader_.legacyReadoutMode(); }

  inline FEDReadoutMode FEDBufferBase::readoutMode() const { return specialHeader_.readoutMode(); }

  inline bool FEDBufferBase::doChecks() const {
    return doTrackerSpecialHeaderChecks() && doDAQHeaderAndTrailerChecks();
  }

  inline uint8_t FEDBufferBase::packetCode(bool legacy, const uint8_t internalFEDChannelNum) const {
    if (legacy) {
      FEDLegacyReadoutMode mode = legacyReadoutMode();
      switch (mode) {
        case READOUT_MODE_LEGACY_SCOPE:
          return PACKET_CODE_SCOPE;
        case READOUT_MODE_LEGACY_VIRGIN_RAW_REAL:
        case READOUT_MODE_LEGACY_VIRGIN_RAW_FAKE:
          return PACKET_CODE_VIRGIN_RAW;
        case READOUT_MODE_LEGACY_PROC_RAW_REAL:
        case READOUT_MODE_LEGACY_PROC_RAW_FAKE:
          return PACKET_CODE_PROC_RAW;
        case READOUT_MODE_LEGACY_ZERO_SUPPRESSED_REAL:
        case READOUT_MODE_LEGACY_ZERO_SUPPRESSED_FAKE:
          return PACKET_CODE_ZERO_SUPPRESSED;
        case READOUT_MODE_LEGACY_ZERO_SUPPRESSED_LITE_REAL:
        case READOUT_MODE_LEGACY_ZERO_SUPPRESSED_LITE_FAKE:
        case READOUT_MODE_LEGACY_PREMIX_RAW:
        case READOUT_MODE_LEGACY_SPY:
        case READOUT_MODE_LEGACY_INVALID:
        default:
          return 0;
      }
    } else {
      FEDReadoutMode mode = readoutMode();
      switch (mode) {
        case READOUT_MODE_SCOPE:
          return PACKET_CODE_SCOPE;
        case READOUT_MODE_VIRGIN_RAW:
          return channel(internalFEDChannelNum).packetCode();
        case READOUT_MODE_PROC_RAW:
          return PACKET_CODE_PROC_RAW;
        case READOUT_MODE_ZERO_SUPPRESSED:
          return channel(internalFEDChannelNum).packetCode();
        case READOUT_MODE_ZERO_SUPPRESSED_LITE10:
        case READOUT_MODE_ZERO_SUPPRESSED_LITE10_CMOVERRIDE:
        case READOUT_MODE_ZERO_SUPPRESSED_LITE8_BOTBOT:
        case READOUT_MODE_ZERO_SUPPRESSED_LITE8_BOTBOT_CMOVERRIDE:
        case READOUT_MODE_ZERO_SUPPRESSED_LITE8_TOPBOT:
        case READOUT_MODE_ZERO_SUPPRESSED_LITE8_TOPBOT_CMOVERRIDE:
        case READOUT_MODE_ZERO_SUPPRESSED_LITE8:
        case READOUT_MODE_ZERO_SUPPRESSED_LITE8_CMOVERRIDE:
        case READOUT_MODE_PREMIX_RAW:
        case READOUT_MODE_SPY:
        case READOUT_MODE_INVALID:
        default:
          return 0;
      }
    }
  }

  inline uint8_t FEDBufferBase::apveAddress() const { return specialHeader_.apveAddress(); }

  inline bool FEDBufferBase::majorityAddressErrorForFEUnit(const uint8_t internalFEUnitNum) const {
    return (specialHeader_.majorityAddressErrorForFEUnit(internalFEUnitNum) && (specialHeader_.apveAddress() != 0x00));
  }

  inline bool FEDBufferBase::feEnabled(const uint8_t internalFEUnitNum) const {
    return specialHeader_.feEnabled(internalFEUnitNum);
  }

  inline bool FEDBufferBase::feOverflow(const uint8_t internalFEUnitNum) const {
    return specialHeader_.feOverflow(internalFEUnitNum);
  }

  inline FEDStatusRegister FEDBufferBase::fedStatusRegister() const { return specialHeader_.fedStatusRegister(); }

  inline bool FEDBufferBase::channelGood(const uint8_t internalFEUnitNum, const uint8_t internalChannelNum) const {
    return channelGood(internalFEDChannelNum(internalFEUnitNum, internalChannelNum));
  }

  inline const FEDChannel& FEDBufferBase::channel(const uint8_t internalFEDChannelNum) const {
    return channels_[internalFEDChannelNum];
  }

  inline const FEDChannel& FEDBufferBase::channel(const uint8_t internalFEUnitNum,
                                                  const uint8_t internalChannelNum) const {
    return channel(internalFEDChannelNum(internalFEUnitNum, internalChannelNum));
  }

  inline bool FEDBufferBase::doTrackerSpecialHeaderChecks() const {
    return (checkBufferFormat() && checkHeaderType() && checkReadoutMode() &&
            //checkAPVEAddressValid() &&
            checkNoFEOverflows());
  }

  inline bool FEDBufferBase::doDAQHeaderAndTrailerChecks() const {
    return (checkNoSLinkTransmissionError() && checkSourceIDs() && checkNoUnexpectedSourceID() &&
            checkNoExtraHeadersOrTrailers() && checkLengthFromTrailer());
  }

  inline bool FEDBufferBase::checkCRC() const { return (checkNoSlinkCRCError() && (calcCRC() == daqCRC())); }

  inline bool FEDBufferBase::checkBufferFormat() const { return (bufferFormat() != BUFFER_FORMAT_INVALID); }

  inline bool FEDBufferBase::checkHeaderType() const { return (headerType() != HEADER_TYPE_INVALID); }

  inline bool FEDBufferBase::checkReadoutMode() const { return (readoutMode() != READOUT_MODE_INVALID); }

  inline bool FEDBufferBase::checkAPVEAddressValid() const { return (apveAddress() <= APV_MAX_ADDRESS); }

  inline bool FEDBufferBase::checkNoFEOverflows() const { return !specialHeader_.feOverflowRegister(); }

  inline bool FEDBufferBase::checkNoSlinkCRCError() const { return !daqTrailer_.slinkCRCError(); }

  inline bool FEDBufferBase::checkNoSLinkTransmissionError() const { return !daqTrailer_.slinkTransmissionError(); }

  inline bool FEDBufferBase::checkNoUnexpectedSourceID() const { return !daqTrailer_.badSourceID(); }

  inline bool FEDBufferBase::checkNoExtraHeadersOrTrailers() const {
    return ((daqHeader_.boeNibble() == 0x5) && (daqTrailer_.eoeNibble() == 0xA));
  }

  inline bool FEDBufferBase::checkLengthFromTrailer() const { return (bufferSize() == daqEventLengthInBytes()); }

  inline const uint8_t* FEDBufferBase::getPointerToDataAfterTrackerSpecialHeader() const { return orderedBuffer_ + 16; }

  inline const uint8_t* FEDBufferBase::getPointerToByteAfterEndOfPayload() const {
    return orderedBuffer_ + bufferSize_ - 8;
  }

  //FEDChannel

  inline FEDChannel::FEDChannel(const uint8_t* const data, const uint32_t offset) : data_(data), offset_(offset) {
    length_ = (data_[(offset_) ^ 7] + (data_[(offset_ + 1) ^ 7] << 8));
  }

  inline FEDChannel::FEDChannel(const uint8_t* const data, const uint32_t offset, const uint16_t length)
      : data_(data), offset_(offset), length_(length) {}

  inline uint16_t FEDChannel::length() const { return length_; }

  inline uint8_t FEDChannel::packetCode() const { return data_[(offset_ + 2) ^ 7]; }

  inline uint16_t FEDChannel::cmMedian(const uint8_t apvIndex) const {
    uint16_t result = 0;
    //CM median is 10 bits with lowest order byte first. First APV CM median starts in 4th byte of channel data
    result |= data_[(offset_ + 3 + 2 * apvIndex) ^ 7];
    result |= (((data_[(offset_ + 4 + 2 * apvIndex) ^ 7]) << 8) & 0x300);
    return result;
  }

  inline const uint8_t* FEDChannel::data() const { return data_; }

  inline uint32_t FEDChannel::offset() const { return offset_; }
}  // namespace sistrip

#endif  //ndef EventFilter_SiStripRawToDigi_FEDBufferComponents_H