[time-nuts] Lady Heather coming soon to a Linux box near you...

[Storer, Darren]

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...
> >
> >
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>
> --
>
> Chris Albertson
> Redondo Beach, California
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