During this sunny afternoon Alexis helped us fix our problem with one of the LED matrix. It appears two pads of a component were soldered together. It still wasn’t working afterwards because the GPIO of the wake up pad we’re using for the latch of this matrix was different than expected (a bug on certain Gumstix Overo versions). After fixing this the LED ran just fine.
I re-wrote and augmented large parts of the code to make it proper for the main program. At the end of the day we’re still not getting an image on our display but we’re very close!