GEMVFAT.h

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#ifndef DataFormats_GEMDigi_GEMVFAT_h
#define DataFormats_GEMDigi_GEMVFAT_h
#include <cstdint>

class GEMVFAT {
public:
  union VFATfirst {
    uint64_t word;
    // v3 dataformat
    struct {
      uint64_t msData1 : 16;  
      uint64_t bc : 16;       
      uint64_t ec : 8;        
      uint64_t header : 8;    
      // is half-full, so it's like a warning
      uint64_t vc : 1;   
      uint64_t : 7;      // unused
      uint64_t pos : 8;  // VFAT position on chamber, 5 used in GE11 but more is needed for phase2
    };
    // v2 dataformat
    struct {
      uint64_t msData1v2 : 16;  
      uint64_t chipID : 12;     
      uint64_t b1110 : 4;       
      uint64_t flag : 4;        
      uint64_t ecV2 : 8;        
      uint64_t b1100 : 4;       
      uint64_t bcV2 : 12;       
      uint64_t b1010 : 4;       
    };
  };
  union VFATsecond {
    uint64_t word;
    struct {
      uint64_t lsData1 : 16;  
      uint64_t msData2 : 48;  
    };
  };
  union VFATthird {
    uint64_t word;
    struct {
      uint64_t crc : 16;      
      uint64_t lsData2 : 48;  
    };
  };

  GEMVFAT();
  // this constructor only used for packing sim digis
  GEMVFAT(const int vfatVer,
          const uint16_t BC,
          const uint32_t EC,
          const uint16_t chipID,
          const uint64_t lsDatas,
          const uint64_t msDatas);
  ~GEMVFAT() {}

  void read_fw(uint64_t word) { fw_ = word; }
  uint64_t get_fw() const { return fw_; }

  void read_sw(uint64_t word) { sw_ = word; }
  uint64_t get_sw() const { return sw_; }

  void read_tw(uint64_t word) { tw_ = word; }
  uint64_t get_tw() const { return tw_; }

  // local phi in chamber
  void setPhi(int i) { phiPos_ = i; }
  int phi() const { return phiPos_; }

  uint64_t lsData() const { return uint64_t(VFATsecond{sw_}.lsData1) << 48 | VFATthird{tw_}.lsData2; }
  uint64_t msData() const { return uint64_t(VFATfirst{fw_}.msData1) << 48 | VFATsecond{sw_}.msData2; }

  uint16_t bc() const {
    if (ver_ == 2)
      return VFATfirst{fw_}.bcV2;
    return VFATfirst{fw_}.bc;
  }
  uint8_t ec() const {
    if (ver_ == 2)
      return VFATfirst{fw_}.ecV2;
    return VFATfirst{fw_}.ec;
  }
  uint16_t vfatId() const {
    if (ver_ == 2)
      return VFATfirst{fw_}.chipID;
    return VFATfirst{fw_}.pos;
  }

  void setVersion(int i) { ver_ = i; }
  int version() const { return ver_; }

  uint8_t quality();

  uint8_t header() const { return VFATfirst{fw_}.header; }
  bool vc() const { return VFATfirst{fw_}.vc; }
  uint8_t position() const { return VFATfirst{fw_}.pos; }
  uint8_t crcCheck() const { return VFATfirst{fw_}.vc; }  // to be removed

  uint8_t b1010() const { return VFATfirst{fw_}.b1010; }
  uint8_t b1100() const { return VFATfirst{fw_}.b1100; }
  uint8_t b1110() const { return VFATfirst{fw_}.b1110; }
  uint8_t flag() const { return VFATfirst{fw_}.flag; }
  uint16_t chipID() const { return VFATfirst{fw_}.chipID; }
  uint16_t crc() const { return VFATthird{tw_}.crc; }

  uint16_t crc_cal(uint16_t crc_in, uint16_t dato);
  uint16_t checkCRC();

  static const int nChannels = 128;
  static const int sizeChipID = 12;

private:
  int ver_;     
  int phiPos_;  

  uint64_t fw_;  // VFAT first word
  uint64_t sw_;  // VFAT second word
  uint64_t tw_;  // VFAT third word
};

#endif