I am quite new with ATMEL STUDIO.
After checking some example codes from DEV Tools XPRO boards I have made my own PCB, including a SAMD21 MCU. Attached picture.
My first intentention is switching on a led. The initial code obtained from ATMEL START is loaded to the ucontroller. Debugging, I concentrate in the file "startup_samd21.c". Well most of the times I can't see the Yellow right arrow indicating the code execution. I have the feeling that the main call (where ports are initialized in another function) is not executed. And I find the yellow right arrow stuck in the while on the Dummy_Handler() function. Phisically I expect to measure some voltage after the main, that does not happen.
I am suspecting that the main function is not called.
Can you please give some idea?