On 05/22/2012 06:37 PM, Pete Lancashire wrote:
I've never though about using one to distribute the 1PPS for NTP. Its a pity there isn't enough umph inside one of these little Linux boxes to implement NTP.
Don't get too excited because this is many months out, but I'm working towards designing a single-board ARM linux computer to run a NTP server. It'll connect to a GPS receiver via UART and PPS, using a hardware timer peripheral in input capture mode to compensate the PPS for interrupt latency (maybe overkill), and the CPU can be clocked by your favorite GPSDO or OCXO. I've seen this done by hacking up x86 hardware, but purpose-built will do even better and will consume very ltitle power. Your OCXO on the other hand, well I can't do anything about that :)
I also need to look into whether there's specialty ethernet hardware needed to make an ideal PTP source, I barely know anything about it. Hopefully it's available for a reasonable cost. As it is the board should be < 40 USD, but I'm still working on the schematic and there's always room to bloat the project with more features.
But first I need to finish the Resolution SMT interface boards I've promised to make. Sent for 9 PCBs yesterday, should arrive in 2-3 weeks.
Here's to feature creep, -- m. tharp _______________________________________________ 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.
