It comes w ntp out of the box if you run fedora.
On Aug 19, 2012, at 20:21, Bob Camp <[email protected]> wrote: > Hi > > The pi doesn't have a conventional serial port. It does have a TTL serial on > the 28 pin connector. There are also IRQ pins on the same connector. Since > they go directly to the CPU chip, hardware latency should be pretty good. It > should interface directly to a TTL output gps receiver like a LEA-6T. You > probably would need to tune up a driver to get it to work. Since it's Linux, > you should be able to get some sort of ntp running on it. AFIK there are no > neat counters like on a 45xx board. You also don't have a well tuned ntp > since it's LInux. > > Bob > > On Aug 19, 2012, at 1:31 PM, Chris Albertson <[email protected]> > wrote: > >> On Sun, Aug 19, 2012 at 10:16 AM, bownes <[email protected]> wrote: >> >>> Why not just use a raspberry pi? Uses a whole 2w at idle. Ntp might bump >>> that to 2.01. >>> >>> >>> >> You certainly could run ntpd on that box. But I wonder how the PPS is >> supported in hardware? What is the standard deviation of interrupt >> latency on the DCD pin on the serial port. Perhaps some one who has a "pi" >> could measure this. All the data should be in the system log as each PPS >> is time stamped and written to the log. If the DCD pin is polled you are >> not going to get decent results. Maybe someone could read the PPS drive >> code. >> >> -- >> >> Chris Albertson >> Redondo Beach, California >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
