Yep, I have no issues reading NMEA data from any of the sources I've
tried
using other code we're developing and also with terminal emulators like
putty and hyperterm.
OK, Darren, but I would still like to know whether Visual GPS works, just
for interest.
I understand this to be the case, but we're operating in an island of
connectivity and have no real alternative to adopting this approach,
other
than to not hook up the GPS to ntpd and simply set the system clock to
GPS
time in the background, and use the local clock as the only reference.
Its
my arguably uneducated (I've just bought the Mills book, so this may
change)
guess that the alternative approach would be worse.
Yes, if you can get GPS to work, that would be better. Any chance you
could try a GPS device which is known to work such as the GPS 18(x) LVC or
Sure electronics evaluation board?
http://www.satsignal.eu/ntp/FreeBSD-GPS-PPS.htm
http://www.satsignal.eu/ntp/Sure-GPS.htm
David, your consideration of my problems is appreciated. Which version
of
the NTP RI are you using?
I don't understand RI.
Have you needed to resort to use of any of the
alternative serial.sys files that my googling has found mention of, or
anything else like that?
I have used Dave Hart's serialpps.sys as it provides kernel-mode
timestamping, but it's a refinement rather than a necessity. Tests I did
showed a average jitter reduction from 5 microseconds to 2 microseconds on
a lightly loaded Windows system.
I've installed NTP with the Meinberg installer and
have been running an alternative ntpd built from source using VS2008.
Cheers,
Darren
I use the NTP downloads from:
http://davehart.net/ntp/win/x86/
and the actual versions in use are listed at the bottom of this page:
http://www.satsignal.eu/mrtg/daily_ntp.html
BTW: I'm not seeing Dave Hart's messages on the NNTP server.
Typically, I install the Meinberg version, and then overwrite the binaries
with Dave Hart's version. I have once compiled my own with VS 2010
Express, but I am not comfortable working in C/C++. Delphi is my
preferred language, and one I find highly productive.
Cheers,
David
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