RE: Re: [Paparazzi-devel] LEA-5H Module Freeze after 30 seconds

[david]

Hello,
"But I'd suspect something strange in your PC software before suspecting
the tunnel code."

FWIW: I was using u-center, first on LInux, 2nd on Windows...same
behavior both times. 

I like that idea of checking if the module is still chatting on the TX
pin. I will do that. 

baudrate is 9600. Reason is in my post. Any changes require a "send" to
push it to the GPS. This freezes it immediately. Leave it alone it
freezes in 30sec. Push the "send" button in u-center it hangs
immediately.

So, I really want to see if the Module is hung or ? I just know u-center
stops updating. Rebooting the tiny (power off...power on) and not
touching anything and u-center picks right up again where it left off.
So that tells me u-center is not hung. It just seems the pipe goes quiet
and u-center stops getting updates over the serial port. 

As a test I took the LEA-4P based tiny and plug it into the same cables
and leaving u-center running and after changing baudrate to 56k it shows
right up. So it's not a cabling or software issue on the ground station
it seems. 

Regards,
David Conger




On Tue, 2008-04-22 at 17:31 +0000, address@hidden wrote:
> The tunnel code is pretty simple, though it has been known to have an
> occasional bug.  You can easily see if the GPS is still running by
> looking for activity on the TX pin of the u-blox chip with a volt
> meter.  But I'd suspect something strange in your PC software before
> suspecting the tunnel code.
> 
> u-blox claims a 30 second time to first fix, maybe what you're seeing
> is related to the extra data from the fix.  Did you increase the baud
> rate to ~56K?  Did you turn off NMEA?  Have you tested the default
> config (NMEA, 9600, 1Hz, etc.)?
> 
> 
> 
> _____________________________________________________________
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> Hi Martin,
> 
> Very good to know. Maybe Paparazzi does something with this at 30sec and 
> freezes the tunnel and not the LEA-5H freeze? I just saw u-center stop 
> responding but that could have been the LPC freeze not the LEA-5H. 
> 
> This is a good example where not having the option in software for NMEA is 
> going to be a problem. LEA-4P will not be available forever. This is why I 
> chose to test the LEA_5H.
> 
> Can I help in some way? 
> 
> David Conger
> 
> 
> 
> From:     Martin Mueller <address@hidden>
> Date:     4/22/08 16:19Subject:  Re: [Paparazzi-devel] LEA-5H Module Freeze 
> after 30 seconds
> 
> Hi David,
> 
> > On the downside. After many tests it freezes exactly 30 seconds after power 
> > on every time. It exactly 30 seconds every time. I did many tests to be 
> > sure. 
> > 
> > Also, it will freeze instantly upon dong any "send" command. Change any 
> > setting and hit "send" it will lock up. 
> > 
> > Any ideas? This module is amazing. Compared to an LEA-4P it seems a huge 
> > leap in sensitivity...there's just this little issue of only working for 
> > 30sec to overcome ;]
> 
> the 4->5 migration application note 
> http://www.u-blox.com/customersupport/ublox5_doc.html says that the 
> current LEA-5 software has "No UTM (Universal Transverse Mercator 
> Projection)." This is probably not related to that 30s issue but means 
> that we need some conversion for Paparazzi.
> 
> Martin
> 
> 
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