[LinuxPPS] Synchronizing a ZDA message with NTP using linuxPPS

[Divi.Oillo at ifremer.fr]

Hi,
I use a master clock "ACEB SOFY M90 EXP 320"  
(http://www.aceb-elec.com/sofy_M90_EXP_hdsy.htm).

My configuration:
NTP 4.6.2 without any patches
linux ubuntu "karmic koala" 10.09
kernel linux 2.6.31 patched with "ntp-pps-2.6.31-rc1.diff"  
(http://ftp.enneenne.com/pub/misc/linuxpps/patches/).

Regards.

Quoting Ben DuPont <dupes at nandgate.com>:

> Divi.Oillo at ifremer.fr wrote:
>> Hi
>>
>> Here is my new ntp.conf (NMEA disabled + stratum 15 on local clock)
>>
>> ------------------------------------------------------------
>> #Undisciplined Local Clock
>> server 127.127.1.0
>> fudge 127.127.1.0 stratum 15
>>
>> #Generic NMEA GPS Receiver
>> #server 127.127.20.0 mode 8 minpoll 4 maxpoll 16 prefer
>> #fudge 127.127.20.0 flag1 1 flag2 0 flag3 1
>>
>> #PPS Clock Discipline
>> server 127.127.22.0 minpoll 4 maxpoll 16
>> fudge 127.127.22.0 flag2 0 flag3 1
>>
>> #134.246.11.121
>> server ntpserver minpoll 4 maxpoll 16 prefer
>> -------------------------------------------------------------
>>
>> ldattach 18 /dev/ttyS0
>>
>> 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 1269202324.429792497, sequence: 19 - clear    
>> 1269202324.929765692, sequence: 19
>> source 0 - assert 1269202325.429609642, sequence: 20 - clear    
>> 1269202324.929765692, sequence: 19
>> source 0 - assert 1269202325.429609642, sequence: 20 - clear    
>> 1269202325.929522149, sequence: 20
>> source 0 - assert 1269202326.429642163, sequence: 21 - clear    
>> 1269202325.929522149, sequence: 20
>>
>> techsas:> cat /sys/devices/virtual/pps/pps*/assert
>> 1269202380.425496211#75
>> techsas:> cat /sys/devices/virtual/pps/pps*/assert
>> 1269202382.425170657#77
>>
>> techsas:> sudo ntpd
>>
>> techsas:> ntpq -pn
>>      remote           refid      st t when poll reach   delay    
>> offset  jitter
>> ==============================================================================
>> *127.127.1.0     .LOCL.          15 l   37   64   17    0.000     
>> 0.000   0.001
>> x127.127.22.0    .PPS.            0 l    4   16  377    0.000   
>> -403.35   5.537
>> x134.246.11.121  .1PPS.           1 u   63   64   37    0.187    
>> 80.869   5.745
>>
>> It seems that PPS works?
>>
>> but sometimes I have:
>> techsas:> sudo ./ppstest /dev/pps0
>> trying PPS source "/dev/pps0"
>> found PPS source "/dev/pps0"
>> ok, found 1 source(s), now start fetching data...
>> time_pps_fetch() error -1 (Connection timed out)
>> time_pps_fetch() error -1 (Connection timed out)
>>
>> And I need to kill ldattach and restart it (ldattach 18 /dev/ttyS0)
>>
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>>
>>
>>
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>>
>>
>
> What gps hardware are you using?  What kernel and ntp version are  
> you using and what patches (if any)?
>
> Ben
>



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