Re: [ntp:questions] ntp pll loop on microcontroller?

francesco.messi...@gmail.com wrote: Hello all, did anyone ever attempted (or succeeded too) in porting the ntpd pll loop to obtain a synchronized time on a microcontroller with pps and serial input (nmea or other it doesn't really matter)? Is anyone aware of similar projects? Thanks

Re: [ntp:questions] how to write a reference clock driver

Harlan Stenn wrote: In article 4944eab4$0$12693$9b622...@news.freenet.de, Juergen Kosel juergen.ko...@freenet.de writes: Juergen Hello, Greg Dowd schrieb: I'm not quite sure what you mean. A reference clock doesn't compute an offset, it acquires, formats and returns a time value from an

Re: [ntp:questions] Hopelessly broken clock?

Chris Richmond wrote: I'm trying to set up ntp on a new Core2 Duo box running Fredora Core9. It appears that it's local clock runs several seconds an hour fast. I'm basing this on running ntpdate against the existing box I have running ntp with pps. It reports skewing the clock by seconds

Re: [ntp:questions] NTP with GPS + PPS falsetick

On 06/15/2010 04:46 PM, Marc Leclerc wrote: Hi, So it seem that after a while NTP reject my GPS and PPS input for time keeping. The only source for time sync is the GPS, I cannot use other devices and/or remote servers. Hi Marc, I have/had similar problems with a Garmin GPS18x and the NMEA

Re: [ntp:questions] serialPPS+gpsd+ntpd large offset jitter

On 01/12/2011 12:07 PM, Hal Murray wrote: Even if you have a perfect source of UTC, it's going to be hard to keep a typical Linux server within 5 microseconds of that clock. I think you need to reconsider the whole system. Where did that 5 microseconds come from? What happens if/when the

Re: [ntp:questions] PPS as a falseticker!!!

On 08/27/2014 08:46 PM, David Lord wrote: Mike S wrote: On 8/27/2014 5:48 AM, valizade...@gmail.com wrote: I not sure, how should I write the ntp.conf file to achieve the maximum accuracy using pps. i don't know if the ntpd use the pps or not in my case! Sometimes it is recognized as a

Re: [ntp:questions] GPS NG type 46 refclock tests

On 12/06/2014 09:50 PM, Paul wrote: [I just don't understand why NTP people like GPSD] Well, they have a decent code base for dealing with a number of GPS devices, and they have hardware PPS support. And using GPSD as a time source makes more sense than using NTPD as source for position

Re: [ntp:questions] GPS NG type 46 refclock tests

On 12/07/2014 12:26 PM, David Taylor wrote: On 07/12/2014 09:44, juergen perlinger wrote: [] david-tay...@blueyonder.co.uk.invalid wrote: ln -s /dev/ttyAMA0 /dev/gps0 Sure that can work. I haven't looked at Refclock 46 in any detail though. That's indeed the way it is intended to work

Re: [ntp:questions] NTP, GPSD PPS

On 12/09/2014 03:29 PM, Sander Smeenk wrote: Hi, I run a stratum 1 server which has a Garmin LVC 18x connected to its ttyS0. The GPS provides a PPS signal via serial and i use gpsd to provide the NMEA sentences and pulse data in shared memory to NTP. This partly works. NTP syncs against the

Re: [ntp:questions] Optimising NTP build for Raspberry Pi 2

On 03/07/2015 01:41 PM, Neil Green wrote: In an attempt to squeeze all I can out of a NTP and GPS/PPS setup on the Raspberry Pi 2 I’m starting to experiment with compile flags using GCC 4.8. Currently I have: CC=gcc-4.8 CFLAGS=-mcpu=cortex-a7 -mfpu=neon-vfpv4 ./configure --enable-NMEA

Re: [ntp:questions] [ATOM (PPS) Refclock] Capture assert AND clear

On 04/21/2015 09:41 AM, f.hiesinger wrote: Hi Folks, I'm sourcing a pps-signal via GPIO on a raspberry Pi(debian whezzy). The pps0 is configured to capture Assert AND Clear (mode = 0x11f3). The internal echo-mechanism is used, so reception of BOTH edges is required. Up to here everything

Re: [ntp:questions] Bug or feature? 4.2.8p3-RC1 - leap_armed not set on dynamic load of leapsecond file

On 06/07/2015 11:01 AM, Mike Cook wrote: Hi, As part of getting ready for the end of the world as we know it I just upgraded a BBB to 4.2.8p3 and discovered that the leap_armed system status is not updated if a leapsecond file is loaded dynamically. Here’s the trace: I restarted ntpd

Re: [ntp:questions] Bug or feature? 4.2.8p3-RC1 - leap_armed not set on dynamic load of leapsecond file

On 06/07/2015 11:01 AM, Mike Cook wrote: Hi, As part of getting ready for the end of the world as we know it I just upgraded a BBB to 4.2.8p3 and discovered that the leap_armed system status is not updated if a leapsecond file is loaded dynamically. Here’s the trace: I restarted ntpd

Re: [ntp:questions] custom NMEA messages

On 12/24/2015 09:43 PM, Leon McCalla wrote: > Hi, > I have a globalsat BU-353-S4 GPS receiver that I would lie to use as a source > for NTPd. When looking at the messages that it produces, unlike the periodic > messages I would expect every second, I get messages in bursts of threes > followed

Re: [ntp:questions] reference clock, shm and ntpd

On 05/25/2016 02:44 AM, Stuart Maclean wrote: > Hi Pearly, thanks so much for your reply, the first one both seems to > understand what I am trying to do AND that I can understand your points. > > I am guessing that 'clockTimestamp*' are the fields from the reference > clock. Since my ref clock

Re: [ntp:questions] reference clock, shm and ntpd

On 05/26/2016 07:23 PM, Stuart Maclean wrote: > Hi Pearly, > > based on your suggestion on the use of ntpq, I indeed ran those commands > and the offset does indeed say about 26ms, see here: > > associd=0 status=0418 leap_none, sync_uhf_radio, 1 event, no_sys_peer, > > version="ntpd

Re: [ntp:questions] reference clock, shm and ntpd

On 05/27/2016 05:15 AM, Stuart Maclean wrote: > Thanks for the info Dan, I have to concede I don't even know what the > 'frequency' is or what it means, much less know why the value is 500. The correction, in PPM, to apply to the clock frequency. (More below...) > How might I reduce that value?

Re: [ntp:questions] Align PPS to UTC or GPS?

On 02/10/2016 07:24 PM, Neil Green wrote: > I'm configuring a Skytraq Venus GPS module and have the option to align the > PPS output to GPS or UTC. Which one is best for use over serial with NTP? IMHO that's a funny configuration option, as the difference between UTC and GPS time scale is an

Re: [ntp:questions] reference clock, shm and ntpd

On 05/24/2016 11:27 PM, Stuart Maclean wrote: > Back in January of this year, I posted my ntp scenario to this list: > > http://lists.ntp.org/pipermail/questions/2016-January/040609.html > > I never got a reply I could understand. > > I am now revisiting the issue of using ntp to read from a

Re: [ntp:questions] 1000s offset between GPS module and NTP servers

Hi all, On 01/23/2017 05:43 PM, Lloyd Dizon wrote: > Hi. > See below. > > On Mon, Jan 23, 2017 at 4:54 PM, Jan Ceuleers > wrote: > >> On 23/01/17 12:25, Lloyd Dizon wrote: >>> I've installed a GPS module on a Raspberry Pi and I'm getting 1000ms >>> offsets between

Re: [ntp:questions] 1000s offset between GPS module and NTP servers

Hi Lloyd, > Hi all. > I'm using this GPS module with a MTK3339 chipset. Bought from here: > https://www.adafruit.com/product/790 > And I'm using ntpd with have PPS support compiled-in. > > Juergen, thanks for pointing out the documentation. I've understood more > about NMEA receivers now. > >

Re: [ntp:questions] NEED_PTHREAD_WARMUP section in ntpd/ntpd.c

On 02/22/2017 06:06 PM, Sundeep Lal wrote: > Starting with ntp-4.2.8p4 a new section was added to ntp-4.2.8p4/ntpd/ntpd.c > at line 273: > > #ifdef NEED_PTHREAD_WARMUP > static void* > my_pthread_warmup_worker(void *thread_args) > { > .. > .. > } > > .. > .. > #endif > > The

Re: [ntp:questions] 4.2.8p9 build issue on windows with openssl 1.0.2g

On 01/20/2017 06:57 AM, sneha b wrote: > Hi, > > I am not able to build 4.2.8p9 on windows7. > Seeing build error conflicting types for 'EVP_MD_CTX'. > I came across a mail regarding this but I am not able to get whats the work > around for this. > > Can some one please help me in resolving

Re: [ntp:questions] ntp.4.2.8 not supporting sha1

On 12/09/2016 07:20 AM, sneha b wrote: > Hi All, > > I am building ntp.4.2.8, source code I got from ntp.org. > We have openssl1.0.2, but the ntpd.exe is not supporting sha1. > Its only supporting MD5 till key id 10. > Can some one point me what are all the openssl libraries needed for >

Re: [ntp:questions] 4.2.8p9 build issue on ARM running Ubuntu 14.04

On 12/01/2016 03:37 PM, Paul wrote: > [conflicting types for 'EVP_MD_CTX'] > > I've been able to build every version for some time but I can't build > 4.2.8.p9/ARM/Ubuntu 14.04 because of the changes to a_md5encrypt. I don't > cross-compile. > > Before I start trying to figure this out I

Re: [ntp:questions] How to get shared memory access from gpsd to ntpd to work?

On 08/16/2017 02:52 PM, Etaoin Shrdlu wrote: > Hi all, > > I've been battling for some time with getting ntpd to set the date/time > from gpsd's shared memory locations. My GPS device is on the network > and sends GPS messages every minute over UDP. This is picked up by gpsd > and it appears I

Re: [ntp:questions] ntpd: malloc deadlock with signal io

Hello Anthony! I don't have an answer to all of your questions, but see below: On 10/21/2017 01:00 AM, Anthony Amaro Jr wrote: > Hello! I am compiling ntp for QNX 6.5 and have run into a deadlock issue. > > Here is how I am compiling ntp: > > LD=ntoppc-ld ./configure CC="qcc

Re: [ntp:questions] Refclock Oncore Driver Change

Hello all! Please see on bottom... On 5/6/19 7:58 AM, Terje Mathisen wrote: > Thomas Laus wrote: >> Group: >> >> The Motorola Oncore receiver has recently become non-usable because of >> the >> recent GPS week rollover.  The receiver year field is limited by the >> receiver >> to the years from

Re: [ntp:questions] Realistic Performance Expectation for GPS PPS fed ntpd jitter

On 10/7/20 8:45 PM, Andreas Mattheiss wrote: > Hello, > > I wonder what's a realistic ballpark for the jitter I can expect when > feeding a GPS PPS into ntpd? > > My setup is: a cheap u-blox NEO6M has its PPS output connected to a MAX232 > level shifter, connected to a true serial port on my

Re: [ntp:questions] Realistic Performance Expectation for GPS PPS fed ntpd jitter

ou could share your UART code mods, that would make an interesting reading. If I only had more time... Pearly > Matt > > On 10/15/20 1:52 AM, Juergen Perlinger wrote: >> On 10/7/20 8:45 PM, Andreas Mattheiss wrote: >>> Hello, >>> >>> I wonder what's a realist

Re: [ntp:questions] ntpd - gpsd communication

On 6/4/20 9:15 PM, a...@avtodoria.ru wrote: > Hello!!  > > I have time jumps made by ntpd because gpsd sometimes puts wrong data to SHM > because of wrong data from gps receiver(very bad chips) > > I have only one time source in ntp.conf — 127.127.28.1 with PPS enabled > > I want to add

Re: [ntp:questions] questions] Ntpq.exe memory issue with windows 2019

On 10/30/20 9:47 AM, David J Taylor wrote: > Hi, Yes The issue goes away if I disable the execution of ntpq.exe, Please > check the link I have shared in my earlier comment. I'm tracking the > problem > down and so far I have found that the issue doesn't occur if you have the > windows time