[time-nuts] Ublox timepulse

[Markus Kleinhenz]

Hi Christophe,

after having a quick look at the Ublox Protocol Spec. and testing on a
M8T it seems the only solution will incorporate some parsing of messages.

The UBX-CFG-TP5 message allows for a user delay but only about +-2s and
an alignment to top of second.

You could however parse the UBX-TIM-TP Messages which are sent several
100ms before the next TIMEPULSE and contain the corresponding timestamp
which could be checked for minute alignment.

If GPS connection is expected to be stable you could set the module to
1PPS until the next pulse is to be minute aligned and then switch to
1PPM before the pulse is actually triggered.

Regards

Markus

Am 04.02.2020 um 11:23 schrieb Christophe Huygens:
> Hi,
>
>
> I need a sync pulse every minute at start of minute, aligned with UTC time (let's not discuss what UTC time really is :-)). Any quick assessment whether uBlox TIMEPULSE out can do this?
>
>
> It does not seem to be a problem to generate a pulse every minute based on UBX-CFG-TP5, but how can this be aligned with a minute. Is the only solution to query time eg every top of second to see if minute has started?
>
>
> I can parse this out of the GPS data even by polling but this seems ... not elegant.
>
>
> A few 10s of millsecond after exact start of minute would be fine. Thoughts? Target CPU is very limited, say ATmega328. Or none at all if it can be avoided.
>
>
> br
>
> Christophe
>
>
>
>
>
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> prof. dr. ir. Christophe Huygens  IMEC-KULeuven-DistriNet
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