[time-nuts] Lady Heather coming soon to a Linux box near you...
Storer, Darren
darren.storer at gmail.com
Fri Apr 22 11:57:09 UTC 2016
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.chris at 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 <holrum at 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 at 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 at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
More information about the Time-nuts_lists.febo.com
mailing list