On 06/09/2016 07:08 PM, Gary E. Miller wrote:
Yo Mike!
On Thu, 9 Jun 2016 18:21:32 -0400
Mike <bellyac...@gmail.com> wrote:
Forgot this in the original post...
ntpshmmon version 1
# Name Seen@ Clock Real L Prec
sample NTP0 1465510765.147894340 1465510765.120560175 1465510764.938999891 0
-1
sample NTP0 1465510765.648664035 1465510765.468806532 1465510764.938999891 0
-1
Is seeing NTP0 twice like this typical?
Nope, should be impossible. Looks to be exactly 500 milliSec apart.
Do you have a square wave output? Or a 2Hz output?
How about you put ppstest on it to see. Except on the Pi you only
see one edge, so can not tell square wave from 2 Hz. Got a scope?
What is the GPS again?
GPS module is a ST22, SkyTraq Venus 6 chipset.
http://www.perthold.de/BINARY/gps-st22.pdf Datasheet is here.
It's an oddball corner case I'm sure...
No scope easily available right now.
If I hook it up to a PC, or with a serial to USB adapter will I be able
to see more about the edge being seen?
mike@rpi-ticker:~ $ sudo ppstest /dev/pps0
trying PPS source "/dev/pps0"
found PPS source "/dev/pps0"
ok, found 1 source(s), now start fetching data...
source 0 - assert 1465518012.001419932, sequence: 12052 - clear
0.000000000, sequence: 0
source 0 - assert 1465518013.001419316, sequence: 12053 - clear
0.000000000, sequence: 0
source 0 - assert 1465518014.001418700, sequence: 12054 - clear
0.000000000, sequence: 0
source 0 - assert 1465518015.001418086, sequence: 12055 - clear
0.000000000, sequence: 0
source 0 - assert 1465518016.001416472, sequence: 12056 - clear
0.000000000, sequence: 0
source 0 - assert 1465518017.001417858, sequence: 12057 - clear
0.000000000, sequence: 0
Mike
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