On Mon, May 13, 2013 at 9:04 AM, <[email protected]> wrote: > You might want to avoid the older Atom boards at this point. I think 28nm or > 22nm is due soon. > > I have.an ARM board handy with serial and usb, but never set up NTS with a > GPS. Is it just NEMA commands? >
TO work well with NTP the borad needs a low latency PPS interrupt handler. THis means that you need both (1) the DCD line on the rs232 port tied to a CPU interrupt pin, with not much between the DCD and the CPU pin and (2) The OS has a simple low latency handler. Linux x86 has a good PPS handler. I don't know about Linux ARM. Also I don't know how the interrupt hardware works on the ARM board. But if it is as described above it will work well enough. You do need access to a hardware interrupt pin. It might be NMEA or it might be some other serial protocol like TSIP. The better timing type GPS receiver avoid NMEA because NMEA lacks soe commands and timing data sentences. NMEA was designed for boat and ship navigation, not timing. -- 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.
