[LinuxPPS] Ntp doesn't work with PPS

christophe taffoureau christophe.taffoureau at obs-nancay.fr
Thu Oct 1 14:53:31 CEST 2009 

Enclosed, ntp.conf file and clockstats. All data in clockstats seem OK.

Christophe

Quoting "Hal V. Engel" <hvengel at astound.net>:

 > How about posting your ntp,conf file so we can see how this is
 > configured.  Also
 > you might want to capture your clock stats.  For the Oncore this will
 > give you
 > a lot more info about what is happening during the initialization 
process.
 >
 > Hal
 >
 > On Wednesday 30 September 2009 06:59:49 am christophe taffoureau wrote:
 >> Hi,
 >>
 >> I've installed Linuxpps (patch ntp-pps-2.6.27-rc3-bis.diff) on OPENSUSE
 >> 11.1 (kernel 2.6.27.7-9).
 >> I use ppstest to control the effect of pps signal (Motorola ONCORE)
 >> connected on serial port 0(ppstest /dev/pps0).
 >> The result is :
 >> / 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 1254228986.375717333, sequence: 40 - clear
 >> 1254228987.370527631, sequence: 41
 >> source 0 - assert 1254228987.375729944, sequence: 41 - clear
 >> 1254228987.370527631, sequence: 41
 >> source 0 - assert 1254228987.375729944, sequence: 41 - clear
 >> 1254228988.370540747, sequence: 42
 >> source 0 - assert 1254228988.375742319, sequence: 42 - clear
 >> 1254228988.370540747, sequence: 42/
 >
 > This looks OK.
 >
 >>
 >> Now, I install source of ntp and compile with option –enable-ONCORE
 >> –enable-SHM and create a link with pps0 (oncore.pps.0) and ttyS0
 >> (oncore.serial.0). The compilation is OK.
 >
 > Does ./ppstest /dev/oncore.pps.0 work?

   result are the same as pps0
     sudo ./ppstest /dev/oncore.pps.0
     trying PPS source "/dev/oncore.pps.0"
     found PPS source "/dev/oncore.pps.0"
     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)

 >
 >>
 >> But, when I start the ntp, I've an "error serial pps"
 >> /linux-ulwj:/dev # /etc/init.d/ntp start
 >> Starting network time protocol daemon (NTPD)ntpd 4.2.4p4 at 1.1520 Tue Sep
 >> 29 12:14:13 UTC 2009 (1)
 >> addto_syslog: precision = 1.000 usec
 >> addto_syslog: ntp_io: estimated max descriptors: 1024, initial socket
 >> boundary: 16
 >> addto_syslog: Listening on interface #0 wildcard, 0.0.0.0#123 Disabled
 >> addto_syslog: Listening on interface #1 wildcard, ::#123 Disabled
 >> addto_syslog: Listening on interface #2 lo, ::1#123 Enabled
 >> addto_syslog: Listening on interface #3 eth0,
 >> fe80::21a:a0ff:fec5:579e#123 Enabled
 >> addto_syslog: Listening on interface #4 lo, 127.0.0.1#123 Enabled
 >> addto_syslog: Listening on interface #5 lo, 127.0.0.2#123 Enabled
 >> addto_syslog: Listening on interface #6 eth0, 193.55.144.75#123 Enabled
 >> local_clock: time 0 offset 0.000000 freq 0.000 state 0
 >> addto_syslog: kernel time sync status 0040
 >> peer_crypto_clear: at 0 next 0 assoc ID 11392
 >> peer_clear: at 0 next 1 assoc ID 11392 refid INIT
 >> refclock_setup fd 5 modem status: 0x4006
 >> refclock_ioctl: fd 5 flags 0x20
 >> newpeer: 127.0.0.1->127.127.30.0 mode 3 vers 4 poll 4 4 flags 0x10a1 0x1
 >> ttl 0 key 00000000
 >> ntp_syslogmask = 0x0000ffff (=all)
 >> local_clock: time 0 offset 0.000000 freq 0.000 state 1
 >> addto_syslog: system event 'event_restart' (0x01) status 'sync_alarm,
 >> sync_unspec, 1 event, event_unspec' (0xc010)
 >> report_event: system event 'event_restart' (0x01) status 'sync_alarm,
 >> sync_unspec, 1 event, event_unspec' (0xc010)
 >> ONCORE[0]: NO <CR><LF> at end of message
 >> linux-ulwj:/dev # refclock_transmit: at 1 127.127.30.0
 >> filegen 2 3463303804 0 3463257600
 >> auth_agekeys: at 1 keys 1 expired 0
 >> timer: interface update
 >> refclock_transmit: at 19 127.127.30.0
 >> addto_syslog: clock GPS_ONCORE(0) event 'clk_badtime' (0x06)
 >> addto_syslog: peer GPS_ONCORE(0) event 'event_peer_clock' (0x85) status
 >> 'unreach, conf, 1 event, event_peer_clock' (0x8015)
 >> peer GPS_ONCORE(0) event 'event_peer_clock' (0x85) status 'unreach,
 >> conf, 1 event, event_peer_clock' (0x8015)
 >> ONCORE: oncore_get_timestamp, error serial pps
 >> ONCORE: oncore_get_timestamp, error serial pps// /
 >>
 >
 > Did you do an ldattach to setup the line discipline for the pps device?

    yes, I do : ldattach 18 /dev/ttyS0

 >
 >> And, if I use ppstest software, I have not pps signal:
 >> /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)
 >> /
 >> If the assert event doesn't change:
 >> / #cat /sys/class/pps/pps0/assert
 >> 1254229133.377654873#187
 >> # cat /sys/class/pps/pps0/assert
 >> 1254229133.377654873#187
 >> # cat /sys/class/pps/pps0/assert
 >> 1254229133.377654873#187
 >> # cat /sys/class/pps/pps0/assert
 >> 1254229133.377654873#187/
 >>
 >>
 >> And in the ntp log, I've this message:
 >> / 30 Sep 14:18:51 ntpd[4458]: offset 0.000000 sec freq 0.000 ppm error
 >> 0.000001 poll 6
 >> 30 Sep 14:18:54 ntpd[11516]: system event 'event_restart' (0x01) status
 >> 'sync_alarm, sync_unspec, 1 event, event_unspec' (0xc010)
 >> 30 Sep 14:19:28 ntpd[11516]: clock GPS_ONCORE(0) event 'clk_badtime' 
(0x06)
 >> 30 Sep 14:19:28 ntpd[11516]: peer GPS_ONCORE(0) event 'event_peer_clock'
 >> (0x85) status 'unreach, conf, 1 event, event_peer_clock' (0x8015)
 >> 30 Sep 14:19:45 ntpd[11516]: clock GPS_ONCORE(0) event 'clk_noreply' 
(0x01)
 >> 30 Sep 14:19:45 ntpd[11516]: peer GPS_ONCORE(0) event 'event_peer_clock'
 >> (0x85) status 'unreach, conf, 2 events, event_peer_clock' (0x8025)
 >> /
 >> Have you an idea about this problem when I start ntp ?
 >>
 >> Thank for your answer,
 >>
 >> best regards
 >>
 >> Christophe TAFFOUREAU
 >>
 >>
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 >> LinuxPPS at ml.enneenne.com
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 >>
 >
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