[LinuxPPS] NTP not using PPS

[susmi sarah george]

Hi....

     Thanks for the support.I will surely try out the things u told.
But as an alternative can u specify any successfully configured NMEA driver with linuxPPSAPI.(I can configure my GPS receiver to give NMEA 
output.)I stretched my PPS ON time to 220ms.will this be enough?

thanks 
lola




  


On Tue, 23 Oct 2007 Rodolfo Giometti wrote :
>On Tue, Oct 23, 2007 at 05:13:40PM -0000, susmi sarah george wrote:
> >
> >
> >    On Mon, 22 Oct 2007 Rodolfo Giometti wrote :
> >    >On Mon, Oct 22, 2007 at 04:37:17PM -0000, susmi sarah george wrote:
> >    > >    Hi,
> >    > >
> >    > >    I am using
> >    > >    Kernel :2.6.23rc2,
> >    > >    PPS patch: ntp -pps-2.6.23rc2.diff,
> >    >
> >    >Please, try using latest LinuxPPS patch.
> >          i dont have internet facility in my time server.so i cant use git
> >    method. so, please send me latest version of LINUXPPS- Patch.Currently i
> >    am using ntp-pps-2.6.23rc2.diff.
>
>You don't need git. Please, refere here:
>
> 	http://ftp.enneenne.com/pub/misc/linuxpps/patches/
>
>looking at README file.
>
> >    >
> >    > >    NTP version: ntp-4.2.4P4
> >    > >    I have complied the Kernel with Serial Driver,PPS support as a
> >    > >    module.Under the PPS SUPPORT I have selected PPS debugging
> >    message,UART
> >    > >    serial support.
> >    > >    I am using GPS Receiver TRIMBLE ACE 3 . The Receiver is Configured
> >    for
> >    > >    TSIP Output and PPS.Data and PPS from GPS receiver is fed to MAX232
> >    and
> >    > >    output of MAX232 is fed to DCD pin of serial port.The serial port I
> >    have
> >    > >    used is ttys3.
> >    > >    I complied Ntp-4.2.4p4 with USE="parse_clocks"  then i have given
> >    like
> >    >
> >    >Did you enabled PPSAPI?
> >          i dont know how to enable PPSAPI when we install NTP. but i have
> >    done following things for PPS
> >
> >    setserial /dev/ttyS3 hardpps
> >    cat /sys/class/pps/pps0/path
> >    /dev/ttyS3
> >    ./ppsctl /dev/ttyS3 enable.
> >
> >        i got device link for pps(/dev/pps0).
> >    The above mentioned things only i have done for PPS.
>
>This is correct from LinuxPPS point of view, but did you enable PPS
>support during NTPD compilation stage? Please refere to NTPD home
>page.
>
> >    >
> >    > >    this
> >    > >    ln -s /dev/ttyS3 /dev/refclock-3
> >    >
> >    >This is not enought, you also need to tell to NTPD which is you PPS
> >    >source with something like:
> >    >
> >    >    ln -s /dev/pps0 /dev/refclockpps-3
> >    >
> >    >However the above command depends on your specific refclock.
> >    >
> >          i am using parse driver(Generic) for TSIP Support.I dont know how to
> >    give link for this driver.i tried above link,but result is same(No output
> >    related to PPS).
>
>The above link was just an example. Looking at PARSE refclock home page
>(http://www.cis.udel.edu/~mills/ntp/html/drivers/driver8.html) you see that the
>neede link are:
>
> 	ln -s <your ttyS* device> /dev/refclock-<TTY mode according to clock type>
> 	ln -s /dev/pps<your PPS device id> /dev/refclockpps-<TTY mode according to clock type>
>
> >    >Please, also verify that your refclock driver supports latest
> >    >LinuxPPS's API.
> >        In that file (refclock_parse.c) i can see many things related to
> >    PPS.but i dont  know how to check that the driver supports Latest LinuxPPS
> >    API.
>
>Parse should support LinuxPPS even if it's not tested yet! :)
>
>Ciao,
>
>Rodolfo
>
>--
>
>GNU/Linux Solutions                  e-mail:    giometti at enneenne.com
>Linux Device Driver                             giometti at gnudd.com
>Embedded Systems                     		giometti at linux.it
>UNIX programming                     phone:     +39 349 2432127


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