David, Well Done, your patch has breathed life into some refclocks I thought had reached the end of the road.
--marki -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of David Malone Sent: Wednesday, 14 August 2013 5:44 PM To: Magnus Danielson Cc: time-nuts@febo.com Subject: Re: [time-nuts] Warped back to 1993 On Sun, Aug 11, 2013 at 03:12:00PM +0200, Magnus Danielson wrote: > I'm sure that the NTP drivers can be hacked to make necessary > adjustments without too much code. I seem to have been caught by the same time warp (or a similar one) on a GPS unit that I've been using with our NTP server since 1999. I doubt I will be able to update the firmware, so I've made the change shown below to the NTP NMEA refclock. It assumes that your GPS unit might be slow by a multiple of 1024 weeks, and trys to get the timestamp within 512 weeks of the current system time before feeding it to NTP. The patch seems to work for me, though it may not be pedantically correct. Hal might have some comments on if it could easily be improved. It might be an interesting option to have in the NMEA driver, but it does seem a litle hacky. David. --- refclock_nmea.c.orig 2010-11-10 03:38:22.000000000 +0000 +++ refclock_nmea.c 2013-08-13 20:05:44.000000000 +0100 @@ -979,6 +1076,8 @@ date.yearday = 0; /* make sure it's not used */ DTOLFP(pp->nsec * 1.0e-9, &reftime); reftime.l_ui += caltontp(&date); + while (reftime.l_i + 512*7*86400 < rd_timestamp.l_i) + reftime.l_i += 1024*7*86400; /* $GPZDG postprocessing first... */ if (NMEA_GPZDG == sentence) { _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
