[LinuxPPS] ntpd

[Folkert van Heusden]

> > oh hold on, i should've done this:
> > test/ppstest 1
> > that works:
> > keetweej:/usr/src/linuxpps-current# test/ppstest 1
> > found PPS source #1 "pps_8250_1" on "/dev/ttyS1"
> > but it doesn't give any events
> This because the GPS antenna must be initialized before starting PPS
> generation.

Ok, I rebooted the GPS receiver and restarted ntpd. Now I get a NMEA
string into ntpd and a pps pulse. It should do that as it only gives me
the string I configured it for meaning that it will also still know that
i asked it to give a pps pulse.
ntpd is receiving the nmea stream:
keetweej:/usr/src/linuxpps-current# ntpq -c pe
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*GENERIC(0)      .DCFa.           0 l   44   64   37    0.000    6.500   4.256
xGPS_NMEA(0)     .GPS.            0 l    -   16  377    0.000  -176.34  10.524  <- *
-muur.intranet.v 131.188.3.223    2 u   46  128   37    0.001    0.795   3.051
 thegateap.intra .INIT.          16 u    -   64    0    0.000    0.000   0.000
-auth1.xs4all.nl 131.188.3.220    2 u   45   64   77    8.522   -1.795   3.871
+ntp1.nl.uu.net  .GPS.            1 u   44  128   77   13.932   -1.323  14.427
+ntp3-rz.rrze.un .DCFp.           1 u   42  128   77   29.585   -0.719  20.863
-ntps1-1.cs.tu-b .PPS.            1 u  106   64   76   28.050   -4.876   3.875
-ptbtime1.ptb.de .PTB.            1 u   40  128   77   23.872   -4.962   5.266

verified the pps ping:
keetweej:/usr/src/linuxpps-current# test/ppstest 1
found PPS source #1 "pps_8250_1" on "/dev/ttyS1"
<nothing>
so something is still wrong

So after that I switched to PPS only:
server  127.127.22.0 prefer          # ATOM (PPS)
fudge   127.127.22.0 flag3 1         # enable PPS API

keetweej:/usr/src/linuxpps-current# ntpq -c pe
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
-GENERIC(0)      .DCFa.           0 l    8   64    1    0.000   -9.240  16.320
 PPS(0)          .PPS.            0 l    -   64    0    0.000    0.000   0.001
 muur.intranet.v 131.188.3.223    2 u   37   64    6    0.001    0.671   0.640
 thegateap.intra .INIT.          16 u    -   64    0    0.000    0.000   0.000
+auth1.xs4all.nl 131.188.3.220    2 u   33   64    7    9.439   -1.346   1.312
+ntp1.nl.uu.net  .GPS.            1 u   33   64    7   14.166   -1.539   5.798
+ntp3-rz.rrze.un .DCFp.           1 u   31   64    7   28.684   -0.581   2.922
*ntps1-1.cs.tu-b .PPS.            1 u   31   64    7   28.729   -0.758   0.601
+ptbtime1.ptb.de .PTB.            1 u   28   64    7   23.911   -0.817   0.666

keetweej:/usr/src/linuxpps-current# test/ppstest 1
found PPS source #1 "pps_8250_1" on "/dev/ttyS1"
nothing!


Folkert van Heusden

*) Udo: you see? gps is waaay off compared to other sources on the net and my local DCF77 receiver
   so that is why one should use gps only for PPS

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