I have to echo Clark's comments. I did solder the PPS output of my RX (no-name $5 board from ebay) to pin 1 DCD. This is pretty common on most OEM boards.
Like Clark I'm looking to build an appliance that "just works". Thanks again for looking into this Punky! Mark On Wed, 2007-12-26 at 22:42 -0800, Clark Hartsock wrote: > I have been using Garmin GPS25 and GPS18 gps receivers, both of which > have rs232 compatible outputs. They also have a hard wired 1pps port > that I connected to the DCD pin (pin 1 on a 9 pin) of the connector. > Yes, I did need to do some soldering. > > These work well on the big bells an whistles linux distros, but my > goal is an appliance that "just works" when you turn it on. The work > on Voyage is greatly appreciated by me because it is perfect for this > goal. > > I haven't followed the kernel very closely to see if the pps patch has > been added to the source tree. But the links you show are for the > kernel. ntpd has the interface already built-in to accept pps and > serial data - you won't need to patch it. > > Thanks! > > Clark > kr6au > > On Dec 26, 2007 5:34 PM, Kim-man 'Punky' TSE <[EMAIL PROTECTED]> wrote: > > Mark and Clark, > > > > Don't get me wrong, but I spend a few minutes on the links below and I > > found that it is indeed for 2.0/2.2/2.4 kernel!? > > > > Luckily I find this one. > > http://wiki.enneenne.com/index.php/LinuxPPS_support > > and patches here: > > http://ftp.enneenne.com/pub/misc/linuxpps/patches/ > > > > Including patch is OK, but patching ntpd may be a issue ... (for me). > > > > Instead, you need special equipment for getting PPS signal, at least you > > need soldering things. What GPS device you usually uses for 1PPS? > > > > Regards, > > Punky > > > > Mark Phillips wrote: > > > You need to look at the NTP sources. These contain a kernel patch. If I > > > understand it correctly, GPSD and others pick up the 1PPS via the kernel > > > (usually connected to the DCD pin on the serial port). > > > > > > They are available here ftp://ftp.kernel.org/pub/linux/daemons/ntp/PPS/ > > > and a rough howto is available here http://etienne.favey.ch/ntp/ > > > > > > Thanks very much for looking at this! > > > > > > Mark > > > > > > On Mon, 2007-12-24 at 09:27 +0800, Kim-man 'Punky' TSE wrote: > > > > > >> Hi , > > >> > > >> But where can I get the 1PPS patch for Linux and instruction? As far as > > >> I read gpsd documentation, it indeed support 1PPS as long as you have > > >> the proper equipment. > > >> > > >> What is the different between gpsd support for 1PPS and the 1PPS patch > > >> for the time server? > > >> > > >> Regards, > > >> Punky > > >> > > >> Mark Phillips wrote: > > >> > > >>> Any thoughts/comments on this Punky? > > >>> > > >>> > > >>> > > >>> On Mon, 2007-12-10 at 14:33 -0500, Mark Phillips wrote: > > >>> > > >>> > > >>>> I have mine setup in a similar way but it is not a true time server in > > >>>> that because of the lack of a disciplining kick on a regular basis it > > >>>> is > > >>>> able to drift between time updates. > > >>>> > > >>>> The problem with NMEA time strings is that they tend to come in a > > >>>> cluster and not at all every second or 3 seconds or 5 seconds. They > > >>>> come > > >>>> along whenever the GPS processor has time to spit them out. > > >>>> > > >>>> The 1PPS pulse from the GPS system is not derived from the decoded data > > >>>> but rather is an inherant component of the GPS signal along with the > > >>>> 10KHz pulse and thus is more reliable. > > >>>> > > >>>> I'd still like to see a 1PPS patched kernel particularly as it would > > >>>> then allow for connections to things like Frequency Standards and LORAN > > >>>> RX's etc. Heck, one could even connect it up to the mains after a very > > >>>> simple signal divider (trick used on clock radios etc) is added. > > >>>> > > >>>> Mark > > >>>> > > >>>> On Thu, 2007-12-06 at 19:24 +0800, Kim-man 'Punky' TSE wrote: > > >>>> > > >>>> > > >>>>> Hi guys, > > >>>>> > > >>>>> Forget to mention, I have setup voyage attached to Garmin GPS18/USB > > >>>>> and > > >>>>> get NTP time sync'd. Of course, this device is not PPS-capable, but > > >>>>> it > > >>>>> works without any patch to the kernel and NTP daemon. See my blog > > >>>>> article: > > >>>>> > > >>>>> http://www.punknix.com/?q=node/116 > > >>>>> > > >>>>> Regards, > > >>>>> Punky > > >>>>> > > >>>>> Mark Phillips wrote: > > >>>>> > > >>>>> > > >>>>>> Now I think about it, updating the gpsd package would also be useful > > >>>>>> for > > >>>>>> this purpose. > > >>>>>> > > >>>>>> FYI, my NTP server is running Voyage on a Neoware N3000 thin client > > >>>>>> (ebay $20). It has a 300MHz via processor in it as well as an IDE > > >>>>>> interface which is now running a CF card. The GPS RX plugs into ttyS0 > > >>>>>> and I'm running gpspipe on ttyS1 to allow my Nixie tube clock to > > >>>>>> correct > > >>>>>> itself. > > >>>>>> > > >>>>>> Mark > > >>>>>> > > >>>>>> On Fri, 2007-11-30 at 05:10 +0000, Clark wrote: > > >>>>>> > > >>>>>> > > >>>>>> > > >>>>>>> Mark Phillips <[EMAIL PROTECTED]> writes: > > >>>>>>> > > >>>>>>> > > >>>>>>> > > >>>>>>> > > >>>>>>>> Hi all, > > >>>>>>>> > > >>>>>>>> Is there anywhere that I can register a feature request for adding > > >>>>>>>> PPS > > >>>>>>>> to the kernel for use in NTP apps? This would be really handy I > > >>>>>>>> think. > > >>>>>>>> > > >>>>>>>> Thanks > > >>>>>>>> > > >>>>>>>> Mark > > >>>>>>>> > > >>>>>>>> > > >>>>>>>> > > >>>>>>>> > > >>>>>>> I would really like that too! > > >>>>>>> > > >>>>>>> I have been using Voyage to try to create an NTP appliance 'cause > > >>>>>>> the > > >>>>>>> commercial ones are WAY beyond my budget! > > >>>>>>> > > >>>>>>> I appreciate the work on Voyage so far! > > >>>>>>> > > >>>>>>> Thanks! > > >>>>>>> > > >>>>>>> > > >>>>>>> _______________________________________________ > > >>>>>>> Voyage-linux mailing list > > >>>>>>> [email protected] > > >>>>>>> http://list.voyage.hk/mailman/listinfo/voyage-linux > > >>>>>>> > > >>>>>>> > > >>>>>>> > > >>>>> > > >>>>> > > >> > > > > > > -- > > Regards, > > Punky > > > > Voyage Solutions (http://solution.voyage.hk) > > * Embedded Solutions and Systems > > - Mesh Networking, Captive Portal, IP Surveillance, VoIP/PBX > > - Network Engineering, Development Platform and Consultation > > > > > > > > -- Mark Phillips, G7LTT/NI2O Randolph, NJ _______________________________________________ Voyage-linux mailing list [email protected] http://list.voyage.hk/mailman/listinfo/voyage-linux
