Re: [ntp:questions] X2 assert and clear events (PPS) on LInux with sure GPS Board
Edward T. Mischanko wrote: Does Richard B. Gilbert have nothing better to say, than to post the same reply 5 times, I think it is very likely that his news or mail, client or service is having issues. -- E-Mail Sent to this address blackl...@anitech-systems.com will be added to the BlackLists. ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] X2 assert and clear events (PPS) on LInux with sure GPS Board
On 1/14/2013 3:18 PM, E-Mail Sent to this address will be added to the BlackLists wrote: Edward T. Mischanko wrote: Does Richard B. Gilbert have nothing better to say, than to post the same reply 5 times, I think it is very likely that his news or mail, client or service is having issues. I apologize on behalf of my computer, software, etc, and my fumble fingers if they were involved. Also my fumbling mind, if THAT was involved. ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] X2 assert and clear events (PPS) on Linux with sure GPS Board
Apology accepted. Richard B. Gilbert wrote in message news:uoodnstftiif5gnnnz2dnuvz_rwdn...@giganews.com... On 1/14/2013 3:18 PM, E-Mail Sent to this address will be added to the BlackLists wrote: Edward T. Mischanko wrote: Does Richard B. Gilbert have nothing better to say, than to post the same reply 5 times, I think it is very likely that his news or mail, client or service is having issues. I apologize on behalf of my computer, software, etc, and my fumble fingers if they were involved. Also my fumbling mind, if THAT was involved. ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] X2 assert and clear events (PPS) on LInux with sure GPS Board
On 1/9/2013 7:09 PM, unruh wrote: On 2013-01-09, thelastroman...@live.fr thelastroman...@live.fr wrote: Hi, Thanks, it seems to work. So, i just need nanoseconds precision with this 1pps on my localhost, don't need NTP or other. You will NOT get nanosecond precision. If that is your goal, give up now. No computer can reach that. a)the time sources are not good enough without corrections after the fact, and b) your computer cannot process the pps signal fast enough to give you that precision. I've have compiled succefully compiled my program with timepps.h, and i want to create a nanoseconds chronometer between each 1PPS. What function should i use from timepps.h code ? You don't. Another solution : i've modeed ppstest, and i settimeofday to 0 each PPS, but the accuracy of settimeofday() seems to be bad, and i want just change the seconds to 0 on my local PC without change HH.MM and date. juste change the seconds to 0 for each PPS/seconds That takes too long. And if your frequency is out by 1PPM ( and that is a very good computer clock if its drift is only 1PPM) your clock will be out by 1000 ns by the time the next pulse occurs. Ie, you have set yourself and impossible task. Sorry for my bad english Your English is alright! Have you noticed the linguistic sins of some of the native speakers? ;-) ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] X2 assert and clear events (PPS) on LInux with sure GPS Board
On 1/9/2013 7:09 PM, unruh wrote: On 2013-01-09, thelastroman...@live.fr thelastroman...@live.fr wrote: Hi, Thanks, it seems to work. So, i just need nanoseconds precision with this 1pps on my localhost, don't need NTP or other. You will NOT get nanosecond precision. If that is your goal, give up now. No computer can reach that. a)the time sources are not good enough without corrections after the fact, and b) your computer cannot process the pps signal fast enough to give you that precision. I've have compiled succefully compiled my program with timepps.h, and i want to create a nanoseconds chronometer between each 1PPS. What function should i use from timepps.h code ? You don't. Another solution : i've modeed ppstest, and i settimeofday to 0 each PPS, but the accuracy of settimeofday() seems to be bad, and i want just change the seconds to 0 on my local PC without change HH.MM and date. juste change the seconds to 0 for each PPS/seconds That takes too long. And if your frequency is out by 1PPM ( and that is a very good computer clock if its drift is only 1PPM) your clock will be out by 1000 ns by the time the next pulse occurs. Ie, you have set yourself and impossible task. Sorry for my bad english Your English is alright! Have you noticed the linguistic sins of some of the native speakers? ;-) ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] X2 assert and clear events (PPS) on LInux with sure GPS Board
Does Richard B. Gilbert have nothing better to say, than to post the same reply 5 times, and not deal with the question at hand? And Unruh, let’s grow-up and reply to posts in clear, COMPLETE, thoughts that truly answer the question. Regardless, Ed Richard B. Gilbert wrote in message news:50f1d262.50...@comcast.net... On 1/9/2013 7:09 PM, unruh wrote: On 2013-01-09, thelastroman...@live.fr thelastroman...@live.fr wrote: Hi, Thanks, it seems to work. So, i just need nanoseconds precision with this 1pps on my localhost, don't need NTP or other. You will NOT get nanosecond precision. If that is your goal, give up now. No computer can reach that. a)the time sources are not good enough without corrections after the fact, and b) your computer cannot process the pps signal fast enough to give you that precision. I've have compiled succefully compiled my program with timepps.h, and i want to create a nanoseconds chronometer between each 1PPS. What function should i use from timepps.h code ? You don't. Another solution : i've modeed ppstest, and i settimeofday to 0 each PPS, but the accuracy of settimeofday() seems to be bad, and i want just change the seconds to 0 on my local PC without change HH.MM and date. juste change the seconds to 0 for each PPS/seconds That takes too long. And if your frequency is out by 1PPM ( and that is a very good computer clock if its drift is only 1PPM) your clock will be out by 1000 ns by the time the next pulse occurs. Ie, you have set yourself and impossible task. Sorry for my bad english Your English is alright! Have you noticed the linguistic sins of some of the native speakers? ;-) ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] X2 assert and clear events (PPS) on LInux with sure GPS Board
On 1/9/2013 7:09 PM, unruh wrote: On 2013-01-09, thelastroman...@live.fr thelastroman...@live.fr wrote: Hi, Thanks, it seems to work. So, i just need nanoseconds precision with this 1pps on my localhost, don't need NTP or other. You will NOT get nanosecond precision. If that is your goal, give up now. No computer can reach that. a)the time sources are not good enough without corrections after the fact, and b) your computer cannot process the pps signal fast enough to give you that precision. I've have compiled succefully compiled my program with timepps.h, and i want to create a nanoseconds chronometer between each 1PPS. What function should i use from timepps.h code ? You don't. Another solution : i've modeed ppstest, and i settimeofday to 0 each PPS, but the accuracy of settimeofday() seems to be bad, and i want just change the seconds to 0 on my local PC without change HH.MM and date. juste change the seconds to 0 for each PPS/seconds That takes too long. And if your frequency is out by 1PPM ( and that is a very good computer clock if its drift is only 1PPM) your clock will be out by 1000 ns by the time the next pulse occurs. Ie, you have set yourself and impossible task. Sorry for my bad english Your English is alright! Have you noticed the linguistic sins of some of the native speakers? ;-) ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] X2 assert and clear events (PPS) on LInux with sure GPS Board
On 1/9/2013 7:09 PM, unruh wrote: On 2013-01-09, thelastroman...@live.fr thelastroman...@live.fr wrote: Hi, Thanks, it seems to work. So, i just need nanoseconds precision with this 1pps on my localhost, don't need NTP or other. You will NOT get nanosecond precision. If that is your goal, give up now. No computer can reach that. a)the time sources are not good enough without corrections after the fact, and b) your computer cannot process the pps signal fast enough to give you that precision. I've have compiled succefully compiled my program with timepps.h, and i want to create a nanoseconds chronometer between each 1PPS. What function should i use from timepps.h code ? You don't. Another solution : i've modeed ppstest, and i settimeofday to 0 each PPS, but the accuracy of settimeofday() seems to be bad, and i want just change the seconds to 0 on my local PC without change HH.MM and date. juste change the seconds to 0 for each PPS/seconds That takes too long. And if your frequency is out by 1PPM ( and that is a very good computer clock if its drift is only 1PPM) your clock will be out by 1000 ns by the time the next pulse occurs. Ie, you have set yourself and impossible task. Sorry for my bad english Your English is alright! Have you noticed the linguistic sins of some of the native speakers? ;-) ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] X2 assert and clear events (PPS) on LInux with sure GPS Board
On 1/9/2013 7:09 PM, unruh wrote: On 2013-01-09, thelastroman...@live.fr thelastroman...@live.fr wrote: Hi, Thanks, it seems to work. So, i just need nanoseconds precision with this 1pps on my localhost, don't need NTP or other. You will NOT get nanosecond precision. If that is your goal, give up now. No computer can reach that. a)the time sources are not good enough without corrections after the fact, and b) your computer cannot process the pps signal fast enough to give you that precision. I've have compiled succefully compiled my program with timepps.h, and i want to create a nanoseconds chronometer between each 1PPS. What function should i use from timepps.h code ? You don't. Another solution : i've modeed ppstest, and i settimeofday to 0 each PPS, but the accuracy of settimeofday() seems to be bad, and i want just change the seconds to 0 on my local PC without change HH.MM and date. juste change the seconds to 0 for each PPS/seconds That takes too long. And if your frequency is out by 1PPM ( and that is a very good computer clock if its drift is only 1PPM) your clock will be out by 1000 ns by the time the next pulse occurs. Ie, you have set yourself and impossible task. Sorry for my bad english Your English is alright! Have you noticed the linguistic sins of some of the native speakers? ;-) ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] X2 assert and clear events (PPS) on LInux with sure GPS Board
On 2013-01-09, thelastroman...@live.fr thelastroman...@live.fr wrote: Hi, Thanks, it seems to work. So, i just need nanoseconds precision with this 1pps on my localhost, don't need NTP or other. You will NOT get nanosecond precision. If that is your goal, give up now. No computer can reach that. a)the time sources are not good enough without corrections after the fact, and b) your computer cannot process the pps signal fast enough to give you that precision. I've have compiled succefully compiled my program with timepps.h, and i want to create a nanoseconds chronometer between each 1PPS. What function should i use from timepps.h code ? You don't. Another solution : i've modeed ppstest, and i settimeofday to 0 each PPS, but the accuracy of settimeofday() seems to be bad, and i want just change the seconds to 0 on my local PC without change HH.MM and date. juste change the seconds to 0 for each PPS/seconds That takes too long. And if your frequency is out by 1PPM ( and that is a very good computer clock if its drift is only 1PPM) your clock will be out by 1000 ns by the time the next pulse occurs. Ie, you have set yourself and impossible task. Sorry for my bad english ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] X2 assert and clear events (PPS) on LInux with sure GPS Board
Hi, Thanks, it seems to work. So, i just need nanoseconds precision with this 1pps on my localhost, don't need NTP or other. I've have compiled succefully compiled my program with timepps.h, and i want to create a nanoseconds chronometer between each 1PPS. What function should i use from timepps.h code ? Another solution : i've modeed ppstest, and i settimeofday to 0 each PPS, but the accuracy of settimeofday() seems to be bad, and i want just change the seconds to 0 on my local PC without change HH.MM and date. juste change the seconds to 0 for each PPS/seconds Sorry for my bad english ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
