[time-nuts] Raspberry Pi NTP server

[Hal Murray]

> Is there any way for a USB device to synchronise with the CPU clock (perhaps
> via the USB framing) so that a special-purpose device could timestamp the PPS
> occurrence with respect to CPU time ? 

If you were designing a special purpose device, just add a counter to measure 
the time from the PPS until the CPU reads the info.

Suppose you could control the USB timing.  Each sample doesn't give you a number, only a yes/no or rather a before/after.  It might work if you ask a bit after you expect the PPS and the next second ask a bit before.  The question is how small can you make a "bit".


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