Stefan Wagner

Thanks for the hint. Unfortunately, it doesn't work with all compiler versions and since the addition isn't necessary, at least so far, I'll leave it without in the default for...

Hi, please try the following: Connect pin P46 to ground (GND) with a jumper wire, then connect the board via USB to your PC without pressing the BOOT button.

As far as I know, they all have a bootloader integrated, but unfortunately the documentation and data sheets are so poor that I can't say for sure. If you can't...

Unfortunately the item is not available in my country.

1. I think so. 2. Yes, but a function must be implemented in the firmware that resets the MCU to BOOT mode when the reset button is pressed. 3. Each...

I haven't really worked much with the SAMD, and even that was years ago. So, I can't help you off the cuff. Did you compile your code without the USB...

This is strange and shouldn't be like that. I suspect there is some overhead in the Arduino core.

Hi, yes.

I don't know, maybe it's a problem with the timing.