Hi Chris/Mark, thanks for the feedback on the Pi 3 horsepower.
For stratum 1 NTP the PPS interface from the Thunderbolt would be required... Hopefully Mark can conquer the GPU and sound challenges soon. Best regards Darren On 22 April 2016 at 07:01, Chris Albertson <albertson.ch...@gmail.com> wrote: > Neither of those two programs require much in the way of CPU power and > the Pi 3 is a very powerful computer. The Pi 3 could be doing several > additional things all at once. I doubt NTP and LH together would use > 10% of the Pi 3's CPU. > > The problem is that I think BOTH NTP and LH will want to communicate > with the T-bolt's serial port. You'd have to figure out way around > that. They both can't have exclusive access. One way might be > software like gpsd to make the GPS available via a socket interface to > multiple users another way would be to configure NTP to use the "atom" > reference clock. This just uses a PPS only and not the serial port. > But then NTP would need another clock to "number the seconds" which > could be another NTP server out on the Internet. > > My opinion is that a Thunderbolt is over kill for NTP. Not only that > but it uses a lot of power. Better to use a tiny, low power GPS > receiver for NTP. It runs 24x7 so it adds up. > > On Thu, Apr 21, 2016 at 3:09 PM, Mark Sims <hol...@hotmail.com> wrote: > >>Would there be enough horsepower for a Pi 3 to run Lady Heather and act > as a stratum 1 NTP server? > > I suspect so, the PI3 has quad core 64-bit capable 1.2GHz processor. > The PI3 seems to be about 50% faster than the PI2. It also runs about > code about as fast as a 2 GHz Pentium 4. But the ethernet interface is > via a USB bridge (or maybe some other serial interface on the PI3). Not > the best way to do things... Also, the current PI Linux distros are all > 32-bit. > > I have the sound file issue worked out (system() a background shell that > invokes aplay). My old code left off the & on the shell command and it was > not returning until the sound finished... d'oh > > I also have the PI color issue resolved... > > Now to finish up the serial port init code... Oh, and also the > ethernet socket code... > > I'm picking up one of those 7" PI LCD screens tomorrow... should make > for a nice package. But they cost twice what the PI does... > > > > > > _______________________________________________ > > 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. > > > > -- > > Chris Albertson > Redondo Beach, California > _______________________________________________ > 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.