— DAQ user 2018/06/18 07:26

Each new window is tagged with an event packet

Each channel is read separately if there is data. Since the counters are reset for each new window, the BCID can be calculated from the TDC time and 2 bytes are saved per channel. The channel number is kept to align data in words.

Remaining bugs : From time to time (<1/min),an empty event header is sent with same GTC number , good ABCID and no channels, the event synchr is recovered on next event header. Since the DAQ is synchronised on GTC, no inefficiencies is seen. It might come from MDCC firmware

The data forwarded to the Event builder are grouped per event. It has similar structure to the previous one.

  // 28 bytes header
  itemp[0]=_event; // Readout event
  itemp[1]=_gtc; // Window number used to synchronize packets
  ltemp[1]=_abcid; // 8 bytes
  itemp[4]=_event; // unused indeed
  itemp[5]=_adr; // IPV4 address 
  itemp[6]=_channels.size(); // Number of lines
  // and then list of channels in 6 bytes structure