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Re: [Paparazzi-devel] GPS not working

From: Jaime Rubio
Subject: Re: [Paparazzi-devel] GPS not working
Date: Sun, 8 Apr 2012 13:00:28 -0400


I am really having a hard time with the GPS. What previously worked in Ucenter is no longer working.

I plug the GPS through a FTDI cable and Ucenter is not able to read anything.

Any help? How should I proceed with Ucenter? The wiki is not useful for me anymore!


On Fri, Apr 6, 2012 at 3:29 PM, Chris Wozny <address@hidden> wrote:
On Thu, Apr 5, 2012 at 6:35 AM, Jaime Rubio
<address@hidden> wrote:
> I have added what you suggested me, but there is no GPS in the Ground Control Station. The only lines in the airframe file I have related to GPS (Ublox LEA 6H) are:
>  <modules>
>     <load name="gps_ubx_ucenter.xml" >
>     </load>
>   </modules>
>     <subsystem name="gps" type="ublox">
>     </subsystem>

Setting the GPS up was extremely quick for us in uCenter and the only
thing the airframe required was defining the subsystem as "ublox". If
I were having this much trouble, I would hook up the GPS module to a
USB-to-UART connector and make sure the configuration didn't get wiped
due to a dead battery or something. If you're using Linux or OSX you
can check it with the "screen" command.

> How long should the GCS take to detect any GPS signal? I have to connect the rx from the GPS to the tx in Yapa and tx from GPS to rx in Yapa, haven't I? By the way, I have Ucenter in Windows, not in Ubuntu, just if this could be the reason.

Our GS407 (based on uBlox LEA-5H) took probably a minute or two to get
it's first position lock outdoors.

> On Thu, Apr 5, 2012 at 2:49 AM, Christophe De Wagter <address@hidden> wrote:
>> Hi,
>> If you have a ublox I would recommend to use
>> <modules>
>>   <load name="gps_ucenter.xml" />
>> </modules>
>> This module has auto-baudrate, and configures all message rates and communication ports. (it does not change the filter mode, or functional GPS settings, only communication stuff: so it is always safe to use).
>> The module will send a DEBUG message that indicates the firmware version in your GPS, the previously selected GPS baudrate and the current (38k4).
>> -Christophe
>> On Tue, Apr 3, 2012 at 5:32 AM, Jaime Rubio <address@hidden> wrote:
>>> Hello,
>>> Trying to get my RC working I have noticed that I cannot switch modes. Once I open the ground control station, it always stays as auto 2. I think this may be related to the fact that it doesn't identify any GPS signal and it works in a kind of failsafe mode automatically, can this be the reason? There is also an error in the Paparazzi Center saying "Unix.Unix_error(2, "read", "")". How can I get my GPS working? I have configured it with U-center and everything is ok, however, it never works when connected to Yapa.
>>> Thanks,
>>> --
>>> Jaime Rubio
>>> Autopilot Team Lead
>>> Phone: 386-383-2738
>>> e-mail: address@hidden

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Jaime Rubio
Autopilot Team Lead
Phone: 386-383-2738
e-mail: address@hidden

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