[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[gpsd-dev] RC for DRIFT message

From: Eric S. Raymond
Subject: [gpsd-dev] RC for DRIFT message
Date: Sun, 22 Feb 2015 16:27:39 -0500 (EST)

I think top of the agenda for the next cycle is the additional report
that Gary and Hal want for time service.  This, as I understand it,
should do for in-band time reporting what the PPS message does for
PPS - that is, report the offset between in-band GPS time and the
system clock.

Almost everything about this feature is easy to specify.  We can call
it DRIFT or CLOCKDRIFT and it can have the same members PPS does -
second and nanosecond parts for real (GPS) and CPU clock time.

The question is when it should be emitted. Plausible candidate times

* When the first I/O from the report burst for a second is received.

* When the report burst for a second is done and the other reports
 are omitted.

Which do you guys actually want? I would favor the second - it fits
into the existing logic better - but either will be relatively easy.
                <a href="";>Eric S. Raymond</a>

It will be of little avail to the people, that the laws are made by
men of their own choice, if the laws be so voluminous that they cannot
be read, or so incoherent that they cannot be understood; if they be
repealed or revised before they are promulgated, or undergo such
incessant changes that no man, who knows what the law is to-day, can
guess what it will be to-morrow. Law is defined to be a rule of
action; but how can that be a rule, which is little known, and less
fixed?  -- James Madison, Federalist Papers 62

reply via email to

[Prev in Thread] Current Thread [Next in Thread]