[ntp:questions] ntp-dev: PPS is a falseticker?

Rob nomail at example.com
Sun Jun 15 06:20:41 UTC 2014


Brian Inglis <Brian.Inglis at Shaw.ca> wrote:
> On 2014-06-14 12:03, Rob wrote:
>> Brian Inglis <Brian.Inglis at SystematicSw.ab.ca> wrote:
>>>> I see no problem, really no problem, in this configuration and I wonder
>>>> why the software makers do see a problem in it and want me to make a
>>>> configuration decision that introduces yet more problems.
>>>
>>> There may be no problem with time only messages: the NMEA driver page,
>>> http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver20.html
>>> shows support of GLL and GGA which provide only time.
>>> Other drivers may allow similarly limited information.
>>
>> There is NO NMEA in or near my system!
>> Everyone seems to think that GPS equates NMEA.  Wrong.
>>
>>> Could you not put a Y or T from your DO GPS message output to your system
>>> serial port, with the PPS on the DCD pin, providing a standard PPS+GPS
>>> serial interface?
>>
>> The serial output of the device does not provide the date.
>> Only the time.  It is not NMEA.
>
> That was just an example that I was aware of.
> It demonstrates that ntpd doesn't need the date.
> Check the driver page (and code) for your device.

There is no driver for this device in ntpd.
I have considered writing something that puts the time in SHM, but
it will be a kludge as it will have to use the system date.



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