Hello,

As far as I can tell, the CPU is crashed and the main loop is not running anymore.
For a while I thought that the problem might be that I would stay in the camera IRQ, but I have put timeouts there now, so it should not happen...
unless of course the IRQ keeps repeating immediately after exiting?
One issue is that I have no HW tools (no loggers), all I have is a multi-meter :-( so that makes life harder...
But anyhow, I have no free pins to use to indicate status either... and of course if the main loop is dead, Serial.write does not work either (I assume at least)..

I need to keep searching...
Cyrille