Common problems

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Revision as of 04:52, 11 January 2011 by Agaeb (talk | contribs) (Added No GPS position item)

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Paparazzi FAQ - Common problems and solutions

I only get a blank (black) GCS

The GCS stays blank until you get telemetry messages (either from the real aircraft or simulated) with the correct MD5 checksum meaning the autopilot has the correct and up to date flightplan/airframe/... programmed in it (in case of an MD5 problem you constantly get a lot of warnings in paparazzi center).
Solution: Probably your telemetry is not set up correctly, this is most likely a XBee configuration issue.

I get a Failure("#of_world:no georef") when trying to load map tiles

You get the georef error because the location is not initialized (probably GCS still blank and no aircraft are present). You can't get map tiles for nowhere...
Solution: Set up your telemetry properly so you get messages from the aircraft OR start a simulation with the appropriate coordinates then load the map tiles.

How do I check if my telemetry is working?

Solution: Launch the link and messages tools in the Paparazzi Center. You should see the the messages coming in (blinking green) in the messages window.
You might need to adjust the device and baud-rate of the link according to your setup, e.g. link -d /dev/ttyUSB0 -s 57600
If you're stuck you can make link very verbose by setting the PPRZ_DEBUG environment variable to '*'

No GPS position

Problem: Your GPS seems to be working, but you cannot get a valid position fix. Speed and course are displayed correctly, though. Possibly you also see Invalid_argument("Latlong.of_utm") errors on the GCS log.

This may happen if you have configured the wrong GPS subsystem for your Tiny board. If you have the LEA-5H module on your Tiny board, but have configured <subsystem name="gps" type="ublox_lea4p"/> in your airframe file, this will occur because the 5H module does not support UTM position.

Solution: Change the gps type to "ublox_lea5h" or add a <define name="GPS_USE_LATLONG"/> flag.