[no subject]

You can determine
        whether your GPS emits this pulse by running at -D 5 and  watching  for
        carrier-detect  state  change  messages in the logfile


....
To  make
        use  of  this  feature, gpsd must be started as root so it can activate
        the timestamping and line discipline; after attempting to set  up  PPS,
        it will relinquish root privileges.



On Sun, 6 Nov 2011, Yan Seiner wrote:

> Bill Unruh wrote:
>>  On Sun, 6 Nov 2011, Yan Seiner wrote:
>> 
>> >  I've been fighting this for a while, and I have no idea what I'm doing 
>> >  wrong.
>> > 
>> >  First off, I have gpsd 2.94 that I am trying to use as a time source 
>> >  for chrony.
>>
>>  How is gpsd set up to deliver the time to shm?
> Not sure.  I thought it was automatic?  Is there a gpsd-side configuration I 
> should be using?  The docs indicate that no special config is needed.
>
>>  Do you have any clues from what is in /var/log/messages,
>>  /var/log/chronyc?
> Nothing that seems to indicate a problem.  Any debug settings I can use to 
> collect useful messages?
>
>> > 
>> >  The platform is an embedded box with no RTC.  When it boots, I start 
>> >  gpsd, set the local clock to the current time using the gps signal, and 
>> >  then start chrony.
>>
>>  How do you do that? Is it set?
> date -s 2010.01.01-01:01
>
> /etc/init.d/gpsd start
> #now wait for a lock
> echo "Waiting for GPS lock"
> sleep 10
> echo '?WATCH={"enable":true,"json":true}' | netcat  localhost 2947 | awk 
> '/"mode":3/{exit}'
> echo "Got GPS lock - setting date"
>
> date -s \
> $( \
> echo '?WATCH={"enable":true,"json":false,"nmea":true}' \
> |  netcat  localhost 2947 \
> |  awk '/GPRMC/{FS=","; print 20 substr($10,5,2) "." substr ($10,3,2) 
> "." substr($10,0,2) "-" substr($2,0,2) ":" substr($2,3,2) ":" substr($ 
> 2,5,2); exit}' \
> ) 
>
> /etc/init.d/ntpd start
>
>
>>
>>  What does chronyc
>>  sources
> root@anchor:/tmp# chronyc sources
> 210 Number of sources = 8
> MS Name/IP address           Stratum Poll LastRx Last sample
> ============================================================================
> # ? SHM0                          0    4    10y     +0ns[   +0ns] +/-    0ns
> # ? SHM1                          0    4    10y     +0ns[   +0ns] +/-    0ns
> # ? GPS1                          0    4    10y     +0ns[   +0ns] +/-    0ns
> # ? SOC3                          0    4    10y     +0ns[   +0ns] +/-    0ns
> ^ + bindcat.fhsu.edu              2    6     51    -12ms[  -12ms] +/-   99ms
> ^ + mail.freerip.com              3    6     52    -17ms[  -23ms] +/-  117ms
> ^ ? 2607.f0d0.2001.00de.0000.     0   10    10y     +0ns[   +0ns] +/-    0ns
> ^ * 199.4.29.166                  2    6     51    -12ms[  -18ms] +/-   97ms
>
>
>>
>>  sourcestats
> root@anchor:/tmp# chronyc sourcestats
> 210 Number of sources = 8
> Name/IP Address            NP  NR  Span  Frequency  Freq Skew  Offset  Std 
> Dev
> ==============================================================================
> SHM0                        0   0     0      0.000   2000.000     +0ns 
> 4000ms
> SHM1                        0   0     0      0.000   2000.000     +0ns 
> 4000ms
> GPS1                        0   0     0      0.000   2000.000     +0ns 
> 4000ms
> SOC3                        0   0     0      0.000   2000.000     +0ns 
> 4000ms
> bindcat.fhsu.edu            4   4   195   -108.126    958.270   +460us 
> 4771us
> mail.freerip.com            8   3   453     -9.475     98.482  +6260us 
> 7290us
> 2607.f0d0.2001.00de.0000.   0   0     0      0.000   2000.000     +0ns 
> 4000ms
> 199.4.29.166                4   4   194   -100.837    631.995  -1050us 
> 3179us
>
>
>
>

-- 
William G. Unruh   |  Canadian Institute for|     Tel: +1(604)822-3273
Physics&Astronomy  |     Advanced Research  |     Fax: +1(604)822-5324
UBC, Vancouver,BC  |   Program in Cosmology |     unruh@xxxxxxxxxxxxxx
Canada V6T 1Z1     |      and Gravity       |  www.theory.physics.ubc.ca/

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