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Re: Time precision in gps_fix_t

From: Gary E. Miller
Subject: Re: Time precision in gps_fix_t
Date: Wed, 22 Jan 2020 12:38:38 -0800

Yo Marco!

On Wed, 22 Jan 2020 13:43:25 +0100
Marco Spanghero <address@hidden> wrote:

> thanks for the reply. I am aware of it, but for the application I am 
> working with now, the host system cannot access a PPS line.

Are you sure?  You don't have USB?   How are you communicating with the
receiver with no serial and no USB?

> I can see 
> the UBX decoding in the GPSD logs, and I would really like to be able
> to access that information.

Everything useful in the logs should also be in the JSON.

> When I do a gps_read and retrive the gps_data_t, for what I
> understand I get back the JSON object TPV.

No, you don't read the TPV, the TPV is pushed, not pulled.

> Is there any way I can access the decoded UBX with gps_read?

Yes, it is in the TPV, SKY, etc.

> As the driver decodes it, I assume it should be known to GPSD right? 

Lost me.  What is "it"?

> what I am interested in is to expose the decoding of UBX-GPSTIME. Any 
> way I can achieve that?

Uh, there is no u-blox UBX-GPSTIME message.  Do you mean UBX-NAV-TIMEGPS
(0x01, 0x20)?  Nothing in there that is not in the TPV.

UBX-NAV-TIMEGPS is only useful with PPS.

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

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

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