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- Path: 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
-
-
- 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
-