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Re: [gpsd-dev] PPS glitch - Venus chip


From: Hal Murray
Subject: Re: [gpsd-dev] PPS glitch - Venus chip
Date: Sun, 31 Jan 2016 00:15:12 -0800

address@hidden said:
> I'll peek at in Monday, but I think the 9600 is the problem.  Too much data
> to fit in the pipe and by the time gpsd gets to chew on it it is stale data.

I've got a scope on it.  The serial stuff takes about a 1/2 second starting 
at the PPS pulse.  Usually it starts 2-20 ms after the PPS, but occasionally 
it starts 10-20 ms before the PPS.  That usually/occasionally may be more 
like 50-50 depending on whatever.

Another worm for the can:
  I think you are using the wrong edge of the PPS.  It's about 4 ms wide.


-- 
These are my opinions.  I hate spam.






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