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Re: [Paparazzi-devel] GPS not working

From: Chris Wozny
Subject: Re: [Paparazzi-devel] GPS not working
Date: Fri, 6 Apr 2012 12:29:55 -0700

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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