[LinuxPPS] ntpd

[Folkert van Heusden]

> Each time you read "/proc/pps/07/*" you get the same output? No
> changes? If so this means that your GPS antenna is stopped PPS pulse
> generation.

Yes, same output.
And the GPS *does* still emit pulses. I verified that in minicom.

Also:
Aug  3 17:45:51 keetweej kernel: [43018276.440000] drivers/pps/pps.c: New message from PID 24176 (flags 0)
Aug  3 17:45:51 keetweej kernel: [43018276.440000] drivers/pps/pps.c: PPS_FETCH: source 7
Aug  3 17:45:52 keetweej kernel: [43018277.440000] drivers/pps/pps.c: New message from PID 24176 (flags 0)
Aug  3 17:45:52 keetweej kernel: [43018277.440000] drivers/pps/pps.c: PPS_FETCH: source 7
Aug  3 17:45:53 keetweej kernel: [43018278.440000] drivers/pps/pps.c: New message from PID 24176 (flags 0)
Aug  3 17:45:53 keetweej kernel: [43018278.440000] drivers/pps/pps.c: PPS_FETCH: source 7

but:
keetweej:/usr/src/ntp-dev-4.2.1p255-RC# cat /proc/pps/*/* ; sleep 3 ; cat /proc/pps/*/*
0.0 #0
0.0 #0
0.0 #0
0.0 #0
0.0 #0
0.0 #0
0.0 #0
0.0 #0
0.0 #0
0.0 #0
0.0 #0
0.0 #0
0.0 #0
0.0 #0
1154619906.415000 #16895
1154619906.200409000 #16891
0.0 #0
0.0 #0
0.0 #0
0.0 #0
0.0 #0
0.0 #0
0.0 #0
0.0 #0
0.0 #0
0.0 #0
0.0 #0
0.0 #0
0.0 #0
0.0 #0
1154619906.415000 #16895
1154619906.200409000 #16891


> > /proc/pps/X/*
> > where X < 7 are all 0 and stay 0
> > so I changed ntpd to:
> > time_pps_findsource(7, path, 40, id, 40);
> Good choice! Verify that PPS source #7 is connect with the right
> serial port.

That is kind of hard to do:
keetweej:/usr/src/ntp-dev-4.2.1p255-RC# cat /proc/pps/sources
id      mode    echo    name                    path
----    ------  ----    ----------------        ----------------
00      1133    no      pps_8250_0              /dev/ttyS0
01      1133    no      pps_8250_1              /dev/ttyS1
...
06      1133    no      pps_8250_0              /dev/ttyS0
07      1133    no      pps_8250_1              /dev/ttyS1

now which is what?


> > IMPORTANT:
> > if I have time_pps_findsource(1, path, 40, id, 40);, /proc/pps/01/assert and clear STAY 0!!
> I don't understand what do you mean. Why you should use PPS source #1
> when your device is connected with #7?

both id 01 and 07 say ttyS1 so I tried them both, just to be sure


Folkert van Heusden

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