If config.tdc_mode is set to XHPTDC8_TDC_MODE_GROUPING the TDC will operate in
grouping mode. In grouping mode each call to xhptdc8_read_hits() will return a group of
timestamps relative to some trigger event. At the beginning of each group an additional hit with
channel number 255 is returned.
As per the latest user guide:
Need to add the
channel 255
data