Re: [chrony-users] PPS correction not being applied

[Brian Gieryk <ke6iyc@xxxxxxx>]

Did as suggested, and seems to be working.  NMEA is showing  +/- 2599 us and GPS (PPS) is showing +/- 1831 us.

Thank you both!

Brian

Sent from my iPhone

> On Feb 24, 2017, at 08:40, Bill Unruh <unruh@xxxxxxxxxxxxxx> wrote:
> 
> 
> 
> William G. Unruh __| Canadian Institute for|____ Tel: +1(604)822-3273
> Physics&Astronomy _|___ Advanced Research _|____ Fax: +1(604)822-5324
> UBC, Vancouver,BC _|_ Program in Cosmology |____ unruh@xxxxxxxxxxxxxx
> Canada V6T 1Z1 ____|____ and Gravity ______|_ www.theory.physics.ubc.ca/
> 
>> On Fri, 24 Feb 2017, Brian Gieryk wrote:
>> 
>> Ok, there is one GPS (with PPS out on a second output, going to GPIO 18 on the rpi)
>> 
>> I did a little change (commented out the two NMEA sources.
>> 
>> I am running gpsd for the GPS source.
>> 
>> It is a Dragino LoRaWAN/GPS hat.
>> 
>> As I mentioned, the GPS is functioning (what appears to me) correctly.
>> 
>> I will add refclocks logging right now.
>> 
>> I will most likely add a second GPS, or more probably, tie it into my Rubidium standard.
>> 
>> As for the PPS signal, ppstest /dev/pps0 give the expected output, finds the PPS signal, and is happy with it.
>> 
>> Chronyc sources just does not seem to recognize it.
> 
> No, the problem probably is that PPS only gives time to the second and gives
> no idea which second it is. Ie, it is time%1sec. It needs something else and
> it needs to know that that something else is actually already working to give
> the time with an accuaracy of a bit better than a second. In your case you
> told the pps to use nmea, and nmea was not working at all, so the PPS had
> nothing to use to tell it which second it was. Lichvar gave you some suggestions. You might try them.
> 
> 
>> 
>> Thank you!
>> 
>> Brian
>> 
>> Sent from my iPhone
>> 
>>>> On Feb 24, 2017, at 00:43, Bill Unruh <unruh@xxxxxxxxxxxxxx> wrote:
>>>> 
>>>> On Thu, 23 Feb 2017, Brian Gieryk wrote:
>>>> 
>>>> I apologize for my seeming ignorance, I have been trying everything I could find in the archives here.
>>> 
>>> No problem. JUst remember that we have no information about your system except
>>> what you tell us.
>>> 
>>> 
>>>> 
>>>> I have been using Linux for a grand total of one week, so some patience will be much appreciated.
>>>> 
>>>> My Pi does not seem to send email directly to anyone other than myself, so it is a 2 step process to send anything from it.
>>>> 
>>>> As for locking to the GPS, the time/date are being set correctly from it now, I would just like some redundancy, and a tad more accuracy, if it can be had.
>>> 
>>> But I am a bit confused. Do you have two or 3 GPS receivers attached to
>>> your Pi? Or are all of GPS, the two NMEA and PPS coming (as I suspect) from one GPS receiver. If my suspicion is true, then that is not redundancy.
>>> The various attempts t read 3 different times from the same receiver could
>>> actually make things worse, not better (the readings fighting with each other).
>>> 
>>> Secondly try to get one thing going at a time. GPS, whatever it is (what
>>> reports the gps to the SHM?-- are you using gpsd?) seems to work now. THe NMEA
>>> are not. Use what works to gine the PPS its seconds-resolution, so PPS can
>>> deliver its soperior accuracy, and so you can see if you can get it working.
>>> Worry about redundancy later.
>>> 
>>>> 
>>>> I will get more info shortly.
>>>> 
>>>> Thank you for your understanding.
>>>> 
>>>> Brian
>>>> 
>>>> Sent from my iPhone
>>>> 
>>>>> On Feb 23, 2017, at 17:46, Bill Unruh <unruh@xxxxxxxxxxxxxx> wrote:
>>>>> 
>>>>> 
>>>>>> On Thu, 23 Feb 2017, Brian Gieryk wrote:
>>>>>> 
>>>>>> 
>>>>>> Relevant chrony.conf snipet:
>>>>> You do not know what is relevant do you?
>>>>> 
>>>>>> 
>>>>>> # offline sources
>>>>>> 
>>>>>> refclock SHM 0 refid GPS precision 1e-1
>>>>> 
>>>>> What is putting this info into shm?
>>>>> 
>>>>>> refclock SHM 1 refid NMEA precision 1e-9
>>>>>> refclock SOCK /tmp/chrony.ttyS0.sock refid NMEA
>>>>> 
>>>>> Two different sources with the same name. That could cause confusion. Where do these come from?
>>>>> 
>>>>> 
>>>>>> refclock PPS /dev/pps0 poll 0 refid PPS lock NMEA
>>>>>> 
>>>>>> Sources output:
>>>>>> 
>>>>>> pi@raspberrypi:~ $ sudo chronyc sources
>>>>>> 210 Number of sources = 5
>>>>>> MS Name/IP address         Stratum Poll Reach LastRx Last
>>>>>> sample
>>>>>> ===============================================================================
>>>>>> #* GPS                       0   4   377 15-+1007us   [-1476us]+/-100ms
>>>>> 
>>>>> GPS reports. So why not lock to it?
>>>>> 
>>>>>> #? NMEA                      0   4     0      -+0ns   [   +0ns]+/-  0ns
>>>>>> #? NMEA                      0   4     0      -+0ns   [   +0ns]+/-  0ns
>>>>> 
>>>>> Neither of your nmea sources report so PPS has nothing to lock to.
>>>>> 
>>>>>> #? PPS                       0   0     0      -+0ns   [   +0ns]+/-  0ns
>>>>>> ^? 2610:20:6f15:15::27       0   8     0      -+0ns   [   +0ns]+/-  0ns
>>>>> 
>>>>> What is this source?
>>>>> 
>>>>> 
>>>>>> pi@raspberrypi:~ $
>>>>>> 
>>>>>> I don't see anything unusual(?) in the log...
>>>>> 
>>>>> Do you see anything? Why not give us 10 or 20 lines from the refclock log?
>>>>> 
>>>>> 
>>>>>> 
>>>>>> I am not an old hand at this......
>>>>>> 
>>>>>> Thank you!
>>>>>> 
>>>>>> Brian
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>>> On Feb 23, 2017, at 09:09, Bill Unruh <unruh@xxxxxxxxxxxxxx> wrote:
>>>>>>> 
>>>>>>> You tell it to lock to NMEA. Do you actually have an NMEA refclock running?
>>>>>>> Ie you might want to show us what your complete chrony.conf is.
>>>>>>> 
>>>>>>> Also in your sources, what sources are listed? Ie, what is the complete output of chronyc sources command.
>>>>>>> 
>>>>>>> In the logging of the refclock, are there any entries? Do they give you a
>>>>>>> clue?
>>>>>>> 
>>>>>>> 
>>>>>>> 
>>>>>>> William G. Unruh __| Canadian Institute for|____ Tel: +1(604)822-3273
>>>>>>> Physics&Astronomy _|___ Advanced Research _|____ Fax: +1(604)822-5324
>>>>>>> UBC, Vancouver,BC _|_ Program in Cosmology |____ unruh@xxxxxxxxxxxxxx
>>>>>>> Canada V6T 1Z1 ____|____ and Gravity ______|_ www.theory.physics.ubc..ca/
>>>>>>> 
>>>>>>>> On Thu, 23 Feb 2017, Brian Gieryk wrote:
>>>>>>>> 
>>>>>>>> Good morning.
>>>>>>>> 
>>>>>>>> Running chrony 3.1, raspberry Pi 3 model B with the latest Raspbian Jessie.
>>>>>>>> 
>>>>>>>> Have GPS working to set the clock with no issue.
>>>>>>>> 
>>>>>>>> Have good PPS on /dev/pps0
>>>>>>>> 
>>>>>>>> From searching the archives I have :
>>>>>>>> refclock PPS /dev/pps0 poll 0 refid PPS lock NMEA
>>>>>>>> 
>>>>>>>> Appended to the end of /etc/chrony/chrony.conf
>>>>>>>> 
>>>>>>>> Running chronyd produces no errors
>>>>>>>> 
>>>>>>>> PPS shows in chronyc sources
>>>>>>>> 
>>>>>>>> However the #? next to PPS never changes (48 hours so far) and there are no corrections.
>>>>>>>> 
>>>>>>>> Any thoughts?
>>>>>>>> 
>>>>>>>> Thank you all!
>>>>>>>> 
>>>>>>>> Brian
>>>>>>>> 
>>>>>>>> Sent from my iPhone
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