Re: [ntp:questions] ntpd + GPS + PPS + Linux (Ubuntu Lucid)

2011-06-10 Thread unruh
On 2011-06-09, David J Taylor david-tay...@blueyonder.co.uk.invalid wrote: The garmin 18x LVM apparently has a problem that it will somtimes deliver the nmea time aver 1 second after the pulse. This makes anything think that that time is associated with t he wrong second. I believe the latest

Re: [ntp:questions] ntpd + GPS + PPS + Linux (Ubuntu Lucid)

2011-06-10 Thread David J Taylor
I believe there is a fix for this GPS 18x LVC problem due from Garmin in the very near future - a week or two. I will post details when I hear I'll beleive it when I see it. That they have been sitting on this problem for as long as they have does not strike one with any confidence. Some

Re: [ntp:questions] ntpd + GPS + PPS + Linux (Ubuntu Lucid)

2011-06-09 Thread unruh
On 2011-06-07, Rob nom...@example.com wrote: Stephan Skrodzki skrod...@stevekist.de wrote: Am Mittwoch, den 01.06.2011, 16:35 + schrieb Rob: I am trying since some time to attach a SkyTraq Based GPS receiver to a serial port + pps which basically works fine by using gpsd 2.92 and ntpd

Re: [ntp:questions] ntpd + GPS + PPS + Linux (Ubuntu Lucid)

2011-06-09 Thread David J Taylor
The garmin 18x LVM apparently has a problem that it will somtimes deliver the nmea time aver 1 second after the pulse. This makes anything think that that time is associated with t he wrong second. I believe the latest gpsd has a fudge for this, but Garmin needs to get its act togetehr. I

Re: [ntp:questions] ntpd + GPS + PPS + Linux (Ubuntu Lucid)

2011-06-08 Thread Stephan Skrodzki
Am Dienstag, den 07.06.2011, 20:24 + schrieb Rob: gpsd plus ntpd does not require any PPS support in the kernel. there is no specfic PPS support via SHM but the gpsd just provides a pretty accurate clock to ntpd. When your system is not overloaded (CPU loading always around or over

Re: [ntp:questions] ntpd + GPS + PPS + Linux (Ubuntu Lucid)

2011-06-08 Thread Rob
Stephan Skrodzki skrod...@stevekist.de wrote: Am Dienstag, den 07.06.2011, 20:24 + schrieb Rob: gpsd plus ntpd does not require any PPS support in the kernel. there is no specfic PPS support via SHM but the gpsd just provides a pretty accurate clock to ntpd. When your system is not

Re: [ntp:questions] ntpd + GPS + PPS + Linux (Ubuntu Lucid)

2011-06-07 Thread Stephan Skrodzki
Am Mittwoch, den 01.06.2011, 16:35 + schrieb Rob: I am trying since some time to attach a SkyTraq Based GPS receiver to a serial port + pps which basically works fine by using gpsd 2.92 and ntpd 4.2.4p8. a) can I use PPS there without the PPSAPI? I do not really want to build a

Re: [ntp:questions] ntpd + GPS + PPS + Linux (Ubuntu Lucid)

2011-06-07 Thread Rob
Stephan Skrodzki skrod...@stevekist.de wrote: Am Mittwoch, den 01.06.2011, 16:35 + schrieb Rob: I am trying since some time to attach a SkyTraq Based GPS receiver to a serial port + pps which basically works fine by using gpsd 2.92 and ntpd 4.2.4p8. a) can I use PPS there without

[ntp:questions] ntpd + GPS + PPS + Linux (Ubuntu Lucid)

2011-06-01 Thread Stephan Skrodzki
Hi there, I am trying since some time to attach a SkyTraq Based GPS receiver to a serial port + pps which basically works fine by using gpsd 2.92 and ntpd 4.2.4p8. Still I get time resets every some hours which I do not really understand: i get less time resets (+1 sec ... -1 sec) when I

Re: [ntp:questions] ntpd + GPS + PPS + Linux (Ubuntu Lucid)

2011-06-01 Thread Chris Albertson
On Wed, Jun 1, 2011 at 6:58 AM, Stephan Skrodzki skrod...@stevekist.de wrote: ... a) can I use PPS there without the PPSAPI? I do not really want to build a new kernel... having a short look it seems that there is no PPS support for the SHM interface (anymore?)? If your copy of Linux is up to

Re: [ntp:questions] ntpd + GPS + PPS + Linux (Ubuntu Lucid)

2011-06-01 Thread Rob
Stephan Skrodzki skrod...@stevekist.de wrote: Hi there, I am trying since some time to attach a SkyTraq Based GPS receiver to a serial port + pps which basically works fine by using gpsd 2.92 and ntpd 4.2.4p8. Still I get time resets every some hours which I do not really understand: i get