Re: Mode/Status not updated in shared mem mode

[Gary E. Miller]

Yo Владимир!

On Sun, 12 Jan 2025 00:49:37 +0300
Владимир Калачихин <v.kalachikhin@gmail.com> wrote:

> 12.01.2025 00:01, Gary E. Miller пишет:
> > Then how do you know that the value is not stale?  i.e. that it has
> > been updated?  
> 
> It is unlikely that a value with type real number does not change
> from measurement to measurement. At least, during the expected
> lifetime. Unless the measurement accuracy is very low.
> Therefore, if it does not change, it is most likely not updated.

An overgeneralization.  On a sailboat, probably correct, on a rocket,
probably not.  Depends on how fast your GNSS receiver is moving, and the
"motion profile" in your receiver.

Some receivers are quite heavy on the data smoothing.  A fact that
users find out the hard way the first time they put a receiver in a
fast moving car.

> The Victron (https://www.victronenergy.com/live/open_source:start) 
> developers follow the same approach, I asked. Only for any values.

A lot on that page.  I missed anything about GNSS on that page?  I do
note that Victron products typically do not move much when in use.



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

            Veritas liberabit vos. -- Quid est veritas?
    "If you can't measure it, you can't improve it." - Lord Kelvin