Re: [ntp:questions] SHM driver as a PPS source
folk...@vanheusden.com said: > How can I tell NTPd that an SHM time source is actually a PPS and that it > thus should combine it with some other sources? (an '*' + 'o' combination so > to say) I don't think you can do it the way you have described. The API for SHM requires that you have already figured out which second matches your PPS pulse. If you have a real PPS pulse, you can connect it to a modem control pin or whatever your kernel supports and use the ATOM driver. Or maybe use gpsd. If your PPS signal comes in via some strange hardware, you can hack your kernel to support the normal PPS API or you can hack the ATOM driver to talk to your hardware. Or you can make your software that is talking to SHM smart enough to provide the right second. Look at the ATOM driver and see how it decides if a time stamp is good enough. You can probably just use the system time and set minsane to 3 so it will outvote your clock if the system time is way off. I'd have to do some testing to verify that worked right, but it might solve your problem. -- These are my opinions. I hate spam. ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] SHM driver as a PPS source
On 2016-11-24 05:49, folkert wrote: How can I tell NTPd that an SHM time source is actually a PPS and that it thus should combine it with some other sources? (an '*' + 'o' combination so to say) Seems to be implied for paired gpsd SHM regions e.g. server 127.127.28.0minpoll 4 maxpoll 4 fudge 127.127.28.0refid GPS time1 0.### server 127.127.28.1minpoll 4 maxpoll 4 prefer fudge 127.127.28.1refid PPS Unit 0 is coarse time and output must *follow* closely *after* unit 1 precise time output to get the correct seconds label. Seems gpsd may connect /dev/gps0 interrupts to kernel pps and use that, as it says the system must support kernel pps. Use ntpshmmon to check SHM contents. -- Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
[ntp:questions] SHM driver as a PPS source
Hi, How can I tell NTPd that an SHM time source is actually a PPS and that it thus should combine it with some other sources? (an '*' + 'o' combination so to say) Folkert van Heusden -- -- Phone: +31-6-41278122, PGP-key: 1F28D8AE, www.vanheusden.com ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
