[time-nuts] Modern motherboard with RS232 port

Chris Albertson albertson.chris at gmail.com
Sun Aug 19 13:31:27 EDT 2012


On Sun, Aug 19, 2012 at 10:16 AM, bownes <bownes at gmail.com> 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



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