Most of this code is originally from refclock_wwvb.c with thanks. Any mistakes are mine. Any improvements are welcome.
The timecode format is:SQRYYYYDDD+HH:MM:SS.mmLT where: S = 'S' -- sync'd in last hour, '0'-'9' - hours x 10 since last update, else '?' Q = Number of correlating time-frames, from 0 to 5 R = 'R' -- reception in progress, 'N' -- Noisy reception, ' ' -- standby mode YYYY = year from 1990 to 2089 DDD = current day from 1 to 366 + = '+' if current year is a leap year, else ' ' HH = UTC hour 0 to 23 MM = Minutes of current hour from 0 to 59 SS = Seconds of current minute from 0 to 59 mm = 10's milliseconds of the current second from 00 to 99 L = Leap second pending at end of month -- 'I' = inset, 'D'=delete T = DST <-> STD transition indicators Note that this driver does not do anything with the L or T flags. The M320 also has a 'U' command which returns UT1 correction information. It is not used in this driver.