Article View: comp.protocols.time.ntp
Article #866Setting time on VxWorks board via NTP
From: Tom Nicinski
Date: Thu, 19 Nov 1992 17:38
Date: Thu, 19 Nov 1992 17:38
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1556 bytes
I'd like to set the time on a VxWorks board when ntpd is started. I'm using Bob Herlien's port of NTP to VxWorks. WAYTOOBIG (in ntp.h) is set to 1000.0 seconds. NTP simply gives up on trying to correct the clock if the offset from its peers is over this; that's the condition at the boot of the board. I don't want to rely on the system TOD clock to set the time when the board boots as its resolution is only 1 second (well below our requirements). Well be connected directly to a stratum 1 server (with a WWVB receiver), so I'd like to use its time to set the VxWorks board's time. If I set the time by hand (or other means) with setgmt, it takes NTP quite a while to say that the 4 second (as an example) offset should be corrected with one big correction. This also is unaccepatable, since the VxWorks board would not be useful until it's time was as close to UTC (or TAI) as possible (we're working on a DA system for a telescope and need to associate position and time with a particular CCD line when drift scanning). Tom Nicinski
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Path: arc1-ca.pugleaf.net!sparky!uunet!ogicse!uwm.edu!linac!mp.cs.niu.edu!fnnews.fnal.gov!fndaud.fnal.gov!nicinski From: nicinski@fndaud.fnal.gov (Tom Nicinski) Newsgroups: comp.protocols.time.ntp Subject: Setting time on VxWorks board via NTP Keywords: VxWorks Message-ID: <1egjepINNrq5@fnnews.fnal.gov> Date: 19 Nov 92 17:38:33 GMT Article-I.D.: fnnews.1egjepINNrq5 Distribution: world Organization: Fermi National Accelerator Laboratory, Batavia IL Lines: 19 NNTP-Posting-Host: fndaud.fnal.gov