Re: [Paparazzi-devel] Re: Can't get GCS to populate

[David Buzz Carlson]

First you need to be sure that you are using the correct UART for the 
Tiny you have.  For Tiny v2, looking at the pinout, "Serial" is UART1 
and "Download" is UART0.

Once you are sure you have the correct UART in your airframe (and make 
sure GPS and Downlink aren't trying to use the same one!), find out 
where the FTDI cable is being attached.  Run "sudo tail -f 
/var/log/messages" and then plug in the FTDI cable.  You should see 
something like:

>   usb 4-1: FTDI USB Serial Device converter now attached to ttyUSB0

This tells you that the FTDI bound to /dev/ttyUSB0.  Check that your 
session is using the correct port.  Run "grep downlink 
conf/control_panel.xml" from the paparazzi directory and make sure it 
prints out this:
>  <variable name="downlink_serial_port" value="/dev/ttyUSB0"/>

The next thing is to make sure that your session is using the right 
serial port.  In that same file, you will see the different sessions you 
can run.  To use the FTDI cable, a particular session would need this line:
     <program name="Data Link">
       <arg flag="-d" constant="/dev/ttyUSB0"/>
       <arg flag="-transport" constant="pprz"/>
       <arg flag="-uplink" constant="" />
       <arg flag="-s" constant="57600"/>

You need to set the -s flag to whatever baud you've configured in your 
airframe file. 

The final thing is to make sure you aren't trying to use API messages 
while using the FTDI cable.  Make sure everything is set to PPRZ 
transport and transparent.

Hope this helps,
Buzz

Alston Pike wrote:
> Sorry for the delay in the response...
>
> I've switched the uarts for the gps & modem link back to the original 
> values (gps on 0 & modem on 1).  Still no luck.  I tried loading the 
> development version of the software on my personal laptop under ubuntu 
> 8.04 and still have the same problems I was having before.
>
> Could the problem be a device problem? I'm using /dev/ttyUSB0 as my 
> device on the data link as opposed to /dev/paparazzi/ttyUSB0.  I 
> checked the /dev/paparazzi directory and the only thing that was 
> listed was a device simply called serial.
>
> Thanks again.
>
> Alston Pike
> BSME 2009
> The University of Alabama
> address@hidden <mailto:address@hidden>
> (706) 594-2812
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