Re: [gpsd-dev] Possible error report

[Sanjeev Gupta]

On Sat, Nov 9, 2013 at 5:11 PM, Eric S. Raymond <address@hidden> wrote:

Working perfectly here with GR601-W and the EVK 6H.  Screenshot of the
former attached; Sanjeev, the PPS line is the really obvious one three
lines from the top of the packet window.

Based on Hal's advice, I killed gpsd, and asked gpsmon to look at /dev/ttyS0.

I can see a value for PPS Offset, as will as the -----PPS---- lines.

 

This is with gpsmon pointed directly at the device (gpsmon
/dev/ttyUSB0), not indirecting through the daemon. When going through
the daemon you won't get PPS packets in gpsmon; superraw mode doesn't
pass them through.  I should add that caveat to the manual page.

Please, please, do.  I think I wasted your Friday evening due to this.

 

I think the smoking gun is the absence of "PPS edge" messages in Sanjeev's
gpsd log messages.  Edge detection is failing for him; Gary, is it for you?

gpsd MUST be seeing some edge, as it passes it on the ntpd.

I think:

1. gpsd should pass this to gpsmon as well (in an ideal world)
   
2. If that is not possible, then we need a clear waiver in the gpsmon documentation, and gpsmon should show "Not Available" in the "PPS Offset:", not leave that blank
   

--
Sanjeev Gupta
+65 98551208     http://www.linkedin.com/in/ghane