Additional pps-gpio

Achim Gratz Stromeko at
Tue Jan 30 20:58:57 UTC 2018

Achim Gratz via devel writes:
> PPS line discipline via USB virtual serial works and produces the
> expected ~1ms offsets due to the USB poll interval.

Actually, that 1ms offset was due to the fact that the serial interface
uses negative logic and I really need to align to the clear edge, not
assert.  Once I set the PPS width from 1ms to 10ms this became really
obvious.  It seems to converge pretty nicely and with jitter around 40µs
now (around the same as LAN jitter).

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