[time-nuts] How to get PPS from ublox mini-PCI GPS to APU2 SoC serial port for ntpd

[Hal Murray]

albertson.chris at gmail.com said:
> If using the PPS for timing and the PPS is inverted you will have to measure
> the delay length an account for in the config file. 

Or use the falling edge rather than the rising edge.

Most instrumentation has a knob/button/whatever to select which direction to 
trigger on.

If your "config file" refers to ntpd, the ATOM/PPS driver has a flag to use 
the falling edge.

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