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Discussion of precise time and frequency measurement

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

Hal Murray

Thu, Nov 10, 2016 10:39 AM

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.

--
These are my opinions. I hate spam.

albertson.chris@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. -- These are my opinions. I hate spam.

Gary E. Miller

Thu, Nov 10, 2016 6:22 PM

Yo Hal!

albertson.chris@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 gpsd to do the PPS detection. It automagiaclly selects the
proper edge.

RGDS
GARY

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
gem@rellim.com Tel:+1 541 382 8588

Yo Hal! albertson.chris@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 gpsd to do the PPS detection. It automagiaclly selects the proper edge. RGDS GARY --------------------------------------------------------------------------- Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703 gem@rellim.com Tel:+1 541 382 8588