On 15/06/2013 02:03, Richard Cagley wrote:
I have a TI DM8168 processor and a u-blox gps.
If I enable an internet server and pps, then pps works great
server clock.redhat.com iburst prefer minpoll 4 maxpoll 4
server 127.127.22.0 minpoll 4 maxpoll 4
fudge 127.127.22.0 flag3 1
However, if I add an NMEA server to my ntp.conf file like this
server 127.127.20.0 mode 1
fudge 127.127.20.0 flag1 1
server 127.127.22.0 minpoll 4 maxpoll 4
fudge 127.127.22.0 flag3 1
then pps stops working. I can kill ntpd and ppstest no longer works. It's
as though nmea is clobbering the serial port.
It sorta feels like this, but there was no resolution
http://lists.ntp.org/pipermail/questions/2011-September/030347.html
Can anyone help me. I've really been struggling with this.
On my FreeBSD system, to enable PPS on the type 20 (NMEA) driver, I just
added flag1 and flag3 set to 1:
_________________________________________
server 127.127.20.1 mode 0 minpoll 4 maxpoll 4 prefer
fudge 127.127.20.1 flag1 1 flag3 1 refid PPS
_________________________________________
It's running ntpd 4.2.7p368, and does have Internet servers as well.
Excuse ant#y wrap....
C:\Users\David>ntpq -pn pixie
remote refid st t when poll reach delay offset
jitter
==============================================================================
o127.127.20.1 .PPS. 0 l 3 16 377 0.000 -0.002
0.002
uk.pool.ntp.org .POOL. 16 p - 1024 0 0.000 0.000
0.002
+192.168.0.1 .PPS. 1 u 29 64 377 0.150 0.029
0.041
+192.168.0.2 .PPS. 1 u 3 64 377 0.233 0.028
0.027
-91.212.90.20 89.36.197.2 3 u 1057 1024 377 18.130 3.258
4.000
-87.117.251.45 242.195.192.75 3 u 953 1024 377 19.668 2.265
4.685
-109.123.121.128 158.43.128.33 2 u 53 1024 377 22.207 -9.700
11.722
-85.119.80.233 193.47.164.28 3 u 323 1024 377 18.982 3.549
8.302
-94.125.132.7 195.66.241.10 2 u 876 1024 377 20.969 2.886
6.127
+94.125.129.7 195.66.241.10 2 u 280 1024 377 19.508 3.565
1.376
I don't know whether that helps.
--
Cheers,
David
Web: http://www.satsignal.eu
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