Vasco Santos

Hello, That it a point of the constructor... I Also try with other M4 devices without luck. Ex: for Adafruit ItsyBitsy ``` //QSPI Pins #define PIN_QSPI_SCK (32u)//CLK #define PIN_QSPI_CS (33u)//CS...

I don't think that is the correct behavior, because in the atmega328p it works fine. So may the sprintf() have the snprintf() in the main function ? I tested in...

@SpenceKonde I also stopped in assembly macros, if you have good news please share.

@SpenceKonde VUSB solved and worked! see this page: https://github.com/12oclocker/V-USB_TinyAvr