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Re: [Paparazzi-devel] Problem with FTDI ground station

From: Nicolas Quendez
Subject: Re: [Paparazzi-devel] Problem with FTDI ground station
Date: Mon, 18 Aug 2014 15:44:34 -0300


After few weeks of different trials, I do not succeed in making the serial link works. In CGS, the screen is always writing « waiting for telemetry ».
Neither with the Xbee modems nor with direct link between the AP and the FTDI board. 

If someone could make me understand what I did wrong, thanks in advance...

In direct link between AP (Lisa M 2.0) and FTDI board (PPZUAV)
- The connections (Rx to Tx, Tx to Rx, ground to ground ; AP powered with 5V ; FTDI board connected by USB to the computer), it seems to me connections are OK according to wiki and FTDI board schematic :

- I do not know if there must be specific files to load ?
For now, I use Bixler_lisa_m_2.xml ;  basic.xml for navigation ;  fixed wing_basic.xml ; ctl_basic.xml ; ins_neutral.xml ; cockpitMM.xml ; and I have tried different xml files for the telemetry (default_fixedwing_imu.xml , xbee868.xml ). 
For the session, I use address@hidden (and tried other rates). 

- In the console, it runs the following without error :  
RUN '/home/nicolas/paparazzi/sw/ground_segment/tmtc/link  -d /dev/ttyUSB0 -transport xbee -s 57600'
RUN '/home/nicolas/paparazzi/sw/ground_segment/tmtc/server '
RUN '/home/nicolas/paparazzi/sw/ground_segment/cockpit/gcs '

and GCS is opening, but everything blank, with « waiting for telemetry ».

My GPS is connected, but indoor so probably no signal, but I imagine that all the IMU signals should be transmitted, no ?

Thanks in advance 
Best regards

Le 27 juil. 2014 à 17:37, Nicolas Quendez <address@hidden> a écrit :

Thanks Gautier,

Indeed, I missed the Udev rules copy to the good place, I will be more attentive next time ! 
So, for now, no more « failure » when I launch GCS. But still the black screen with « waiting for telemetry ». 

In XCTU (windows), from ground station modem, it detects the remote autopilot modem (when Lisa M powered), and I can see that the autopilot sends continuously some packets to the ground station modem. So informations probably go from the AP to the ground station modem well. But I suspect my Paparazzi configuration still not good because it seems it cannot read the informations and show them in GCS… 

I continue my exploration, any advices welcome !
Thanks for the support
Best regards

Le 25 juil. 2014 à 18:14, Gautier Hattenberger <address@hidden> a écrit :


Did you check this pages ? :


Le 24/07/2014 14:52, Nicolas Quendez a écrit :

Hi everybody,

I just begin to manipulate Paparazzi hardware and software. 

For now : 
- I succeed in working with flight plan simulation
- I succeed in uploading software into my Lisa M AP 
- I succeed into programming my Xbee modules with XCTU (windows) with the PPZUAV FDTI utility board. 

BUT : 
when I plug the FTDI board with xbee module (coordinator) by USB on my ubuntu computer, I have the following error when starting a session : 
Failure("Error opening modem serial device : fd < 0 (/dev/ttyUSB0) ») : 

RUN '/home/nicolas/paparazzi/sw/ground_segment/tmtc/link -d /dev/ttyUSB0 -transport xbee -s 57600'
Failure("Error opening modem serial device : fd < 0 (/dev/ttyUSB0)")
Broadcasting on network, port 2010
 Read Socket : Connection reset by peer
FAILED '/home/nicolas/paparazzi/sw/ground_segment/tmtc/link' with code 1

I have checked with dmesg that /dev/ttyUSB0 seems to be the good place for the board.
I have added the current user  to the modems group as explained in the FAQ ( 
I made the xbee module set as coordinator, with baud rate set to 57000 
My Xbee is a 868 LP 80 K modem. 

On the PPZUAV FTDI board the red led is ON. 
The green led is ON (but not flashing).

Have you any idea of my mistake, or configuration that I did not do ? Are there some drivers to install for the FTDI board, or a configuration to put into the xml files ? 

Thanks in advance
Best regards

Hardware : 
<Pièce jointe.jpeg>

XCTU configuration : 

<Pièce jointe.gif>

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