[gpsd-users] PPS problem with u-blox 8

[Christian Rossi]

Hello

I use a Navilock NL-8005P MD6 (u-blox 8) with a SparkFun MAX3232 to 
convert the PPS data from a TTL level to an RS232 level.

I use gpsd 3.16 on Ubuntu 14 and with gpsmon (u-blox mode) there is no 
value on the PPS line:

gpsmon data:  TOFF : 0.148966...  PPS:

With ntpq -p it's ok for SHM(0) and not for SHM(1).

But when I use ppscheck there is data on the DSR pin:

% ppscheck /dev/ttyS1
1510050649  999177340
1510050650   99182899 TIOCM_DSR
1510050650  999177604
1510050651   99171403 TIOCM_DSR
1510050651  999178897
1510050652   99165321 TIOCM_DSR
1510050652  999175923
...

With ntpshmmon there is only NTP0:

% ntpshmmon
ntpshmmon version 1
#      Name   address@hidden Clock Real               L Prec
sample NTP0 1510051124.165798757 1510051124.165494764 
1510051124.000000000 0  -1
sample NTP0 1510051125.157278365 1510051125.156847436 
1510051125.000000000 0  -1
sample NTP0 1510051126.166549134 1510051126.165614202 
1510051126.000000000 0  -1
sample NTP0 1510051127.156777756 1510051127.156690512 
1510051127.000000000 0  -1
sample NTP0 1510051128.172258477 1510051128.171815290 
1510051128.000000000 0  -1

And with the gpsd log there is: kernel PPS timeout Interrupted system call

gpsd:PROG: NTP: shmat(30212098,0,0) succeeded, segment 0
gpsd:PROG: NTP: shmat(30244867,0,0) succeeded, segment 1
gpsd:PROG: NTP: shmat(30277691,0,0) succeeded, segment 2
gpsd:PROG: NTP: shmat(30310472,0,0) succeeded, segment 3
gpsd:PROG: NTP: shmat(2424865,0,0) succeeded, segment 4
gpsd:PROG: NTP: shmat(2457634,0,0) succeeded, segment 5
gpsd:PROG: NTP: shmat(2490403,0,0) succeeded, segment 6
gpsd:PROG: NTP: shmat(2523172,0,0) succeeded, segment 7
gpsd:PROG: PPS:/dev/ttyS1 chrony socket /var/run/chrony.ttyS1.sock 
doesn't exist
gpsd:PROG: KPPS:/dev/ttyS1 checking /sys/devices/virtual/pps/pps0/path, 
/dev/ttyS1
gpsd:INFO: KPPS:/dev/ttyS1 RFC2783 path:/dev/pps0, fd is 6
gpsd:INFO: KPPS:/dev/ttyS1 pps_caps 0x1133
gpsd:INFO: KPPS:/dev/ttyS1 have PPS_CANWAIT
gpsd:INFO: KPPS:/dev/ttyS1 kernel PPS will be used
gpsd:PROG: PPS:/dev/ttyS1 thread launched
gpsd:INFO: PPS:/dev/ttyS1 ntpshm_link_activate: 1
gpsd:INFO: KPPS:/dev/ttyS1 kernel PPS timeout Interrupted system call
gpsd:INFO: KPPS:/dev/ttyS1 kernel PPS timeout Interrupted system call
gpsd:INFO: KPPS:/dev/ttyS1 kernel PPS timeout Interrupted system call
gpsd:PROG: NTP: ntpshm_put(/dev/ttyS1 clock)  1510049579.000000000 @  
1510049579.170917047
gpsd:PROG: NTP: ntpshm_put(/dev/ttyS1 clock)  1510049580.000000000 @  
1510049580.242969324
gpsd:PROG: NTP: ntpshm_put(/dev/ttyS1 clock)  1510049582.000000000 @  
1510049581.140405826
gpsd:INFO: KPPS:/dev/ttyS1 kernel PPS timeout Connection timed out
gpsd:PROG: NTP: ntpshm_put(/dev/ttyS1 clock)  1510049583.000000000 @  
1510049583.148434771
gpsd:PROG: NTP: ntpshm_put(/dev/ttyS1 clock)  1510049584.000000000 @  
1510049584.156933441
gpsd:INFO: KPPS:/dev/ttyS1 kernel PPS timeout Connection timed out
...

On the file clear and assert on sys/devices/virtual/pps/pps0 there is:

0.000000000#0

and on the file path there is /dev/ttyS1

What can I do to get the PPS data?

Thanks.

--
Christian Rossi