Miroslav lichvar thanks for the reponse. I don't think it is a firmware bug in GPS because I have made a little program(using c++ language) which is receiving SIGIO signal via serial port and it continuously receiving GPS and PPS data.
I have installed pps-tool, when I run ppstest /dev/pps0 command it is fetching data for 2 mints and after that pps0 says connection time out error. I don't know the actual problem why ppstest /dev/pps0 command stop receiving PPS data while I am receiving SIGIO pulse in my program ? ________________________________ From: Miroslav Lichvar <mlich...@redhat.com> Sent: Monday, October 8, 2018 3:44:11 PM To: chrony-users@chrony.tuxfamily.org Subject: Re: [chrony-users] Help Chrony synchronization(connectivity) is lost after 10 to 15 minutes. On Mon, Oct 08, 2018 at 09:51:17AM +0000, Munsif ALI wrote: > After 10 mints. The refclock log shows following output: > 2018-10-08 09:32:32.375898 NEMA 0 N 0 -3.758982e-01 -3.758982e-01 > 1.000e-06 > 2018-10-08 09:32:33.000070 PPS 0 N 0 -6.974900e-05 -6.974948e-05 > 1.000e-09 > 2018-10-08 09:32:33.352441 NEMA 1 N 0 -3.524413e-01 -3.524413e-01 > 1.000e-06 > 2018-10-08 09:32:34.000011 PPS 1 N 0 -1.115700e-05 -1.115749e-05 > 1.000e-09 > 2018-10-08 09:33:25.828062 NEMA 6 N 0 5.199121e+04 5.199121e+04 > 1.000e-06 > 2018-10-08 09:33:26.819088 NEMA 7 N 0 5.199122e+04 5.199122e+04 > 1.000e-06 This is very strange. It looks like the time reported by the GPS is suddenly off by ~14.4 hours. > 2018-10-08 09:33:42.829835 NEMA 7 N 0 5.199121e+04 5.199121e+04 > 1.000e-06 > 2018-10-08 09:33:44.832557 NEMA 9 N 0 8.639983e+04 8.639983e+04 > 1.000e-06 And here it is almost exactly 24 hours off. I think that indicates a firmware bug in the GPS. Is there a firmware update you could apply? I'd suggest to ask on the gpsd-users mailing lists and see if anyone has experience with this device. -- Miroslav Lichvar -- To unsubscribe email chrony-users-requ...@chrony.tuxfamily.org with "unsubscribe" in the subject. For help email chrony-users-requ...@chrony.tuxfamily.org with "help" in the subject. Trouble? Email listmas...@chrony.tuxfamily.org.
