This page contains a few debugging tip. When filing an issue please go through this list as it's the first thing we'll ask you to do.
Getting the exact version of libmraa you're running is really important to us. The best way to get this is to call mraa_get_version() or mraa.getVersion(). If mraa returns x.x.x-dirty then your version was not built from a git tree or you built out of tree (see our building doc) - or you don't have git installed.
mraa logs pretty much everything that goes wrong to syslog. These days it'll go
to the systemd journal so check with sudo journalctl -f whilst running your
app or check all libmraa messages with journalctl -t libmraa. Grab all the
messages from the initialisation message right up to your last one. Using a
pastebin is always a good idea, I like dpaste.com. If your system does not have
systemd likely your log is in /var/log/messages or a similar location.
- Not running as root
- Incorrect IO pin numbers, mraa uses physical connector pin numbering see your platform documentation for details
- Your platform is unsupported
- Using the wrong pin, check pin capabilities either using the API or your platform documentation