Arduino really has to enter the world of real debuggers now, Serial.print()ing is for the birds.
Well stood me in good stead for over 40 years, but then if you don't understand what you are doing then JTAG might be the answer. 
Arduino really has to enter the world of real debuggers now, Serial.print()ing is for the birds.
Well stood me in good stead for over 40 years, but then if you don't understand what you are doing then JTAG might be the answer.