Lose the per-driver PPS code

Dave wants to lose the per-driver PPS code and let the ATOM driver handle it all.

WhatSorted ascending Status
arbiter (seems OK)
as2201 (seems OK)
hpgps (seems OK)
jupiter bug_small.png Bug #560
Master bug_small.png Bug #557
msfees bug_small.png Bug #561
mx4200 bug_small.png Bug #562
nmea bug_small.png Bug #563
oncore bug_small.png Bug #559
parse bug_small.png Bug #558
ripencc bug_small.png Bug #564
trak bug_small.png Bug #565
true bug_small.png Bug #566
zyfer bug_small.png Bug #567

Let's use this topic to discuss issues about this set of bugs.

Harlan: Do the remarks "seems OK" mean - OK as they do not use any of the PPSAPI?

-- FrankKardel - 01 Feb 2006

Yes, it means that I did a grep PPS refclock*.c and the ones marked "seems OK" only discussed PPS in their comments.

-- HarlanStenn - 01 Feb 2006

The thing is that the refclock drivers know exactly whether the PPS of the device they are controlling is valid by the information from the device itself.

ATOM/PPS must use PPS derived time stamps only when the clock is doing well. ATOM/PPS has currently no way whatsoever to know about the health state of PPS (I currently see a 500ppm frequency check) - it assumes that PPS is always valid when it is there.

We have seen refclock/network scenarios where knowing whether PPS is healthy was absolutely crucial (effect: oscillating clock setting of several 100ms).

The scenario was invalid PPS information from a PPS source and valid time time information from the network.

For ATOM/PPS we would need an interface where the PPS health information is available to ATOM/PPS.

Currently this task is managed in the refclock drivers (some better, some worse).

-- FrankKardel - 01 Feb 2006

This topic: Dev > WebHome > LoseThePerDriverPPSCode
Topic revision: r4 - 2006-02-01 - 10:26:18 - FrankKardel
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