Re: [Paparazzi-devel] GPS problem

[Uttam Chandrashekhar]

It changes to the new baud rate, infact, it works all right for some time and then, after turning power off and reconnecting after a while, it's lost all settings. It gets a fix at 38400, but does not remember the settings. The 3D accuracy is rather poor, about 8mts. At the same location, by previous Tiny gives me accuracy of about 3mts. 

After I wait a while and power on, U-center is just dead, at baud 38400, but the moment I change to 9600, everything light up on screen and I get a 3D fix, but with all default settings. I thought it could be bad firmware ( 5.01 ), but when I try upgrading firmware, it says flash identification file not found and completes in just 4 secs, the wiki says be prepaired to wait a long time! SO I wonder if it's a defective GPS module?

-Thanks

Uttam

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From: David Carlson <address@hidden>
To: address@hidden
Sent: Saturday, 25 July, 2009 2:06:31 PM
Subject: Re: [Paparazzi-devel] GPS problem

If you change the baud rate to 38400 in u-center, does it immediately change to this new baud?  or does it stay at 9600?  It's possible that your DI (data in) line is not working to the module, but DO (data out) is intact.

Buzz

Uttam Chandrashekhar wrote:
> *Hi Mark, Martin,
>
>
> It's not the capacitor. The GPS just does not remember settings, it's as if FLASH is not working. Sometimes, when I try programming in U-center, and try to double click on the POSLLH, SOL, STATUS, SVINFO, VELNED, it does not go from grey to black, sometimes it does. On reconnecting power, it refuses to work at the programmed baud rate ( 38400 ) and get's a fix and starts working only at default settings, it does not remember any of my programmed settings. It keeps reverting back to original default settings.
>
>
>
>
> -TIA
> Uttam*
>
> ------------------------------------------------------------------------
> *From:* "address@hidden" <address@hidden>
> *To:* address@hidden
> *Sent:* Friday, 24 July, 2009 2:46:09 PM
> *Subject:* RE: [Paparazzi-devel] GPS problem
>
> Uttam,
> It could be that you haven't used the board in a while and the capacitor on the GPS board (C77) has lost it's charge thus loosing the settings. The capacitor is charged when the GPS module is in operation. Keep it powered on for a while to re-charge it.
> Hope this helps. Cheers, Mark
> 
> ------------------------------------------------------------------------
> *From:* paparazzi-devel-bounces+mark.griffin=address@hidden [mailto:paparazzi-devel-bounces+mark.griffin=address@hidden] *On Behalf Of *Uttam Chandrashekhar
> *Sent:* Friday, 24 July 2009 9:05 AM
> *To:* address@hidden
> *Subject:* [Paparazzi-devel] GPS problem
>
> Hi guys,
>
> I have a Tiny 1.3 with a LEA 5H on it. I'm able to get the configuration file on to it, and get a 3D fix using U-center, but it just does not seem to remember the settings! I have checked the store settings check box. I also don't get all the GPS messages in the messages program in Ppz center. Anyone know what's happening?
>
> -TIA
> Uttam
>
>
>
>
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