Add instructions for setting bcdUSB to 0x0210 on SAMD boards about arduino HOT 8 OPEN

The instructions in README.md only update the USB version for AVR boards. Without the board reporting a USB version of 0x0210 Chrome will not attempt to read the landing page descriptor from the device because it assumes it is not supported. The M0 is an SAMD board.

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Ah! Thanks, that makes sense. I'll look into trying to update the USB version for the SAMD.

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@tylercrumpton

Did you make progress?

This is the change I made in USBCore.h :
#define D_DEVICE(_class,_subClass,_proto,_packetSize0,_vid,_pid,_version,_im,_ip,_is,_configs)
{ 18, 1, USB_VERSION, _class,_subClass,_proto,_packetSize0,_vid,_pid,_version,_im,_ip,_is,_configs }

However, it caused Windows 10 no longer to recognize the board. It also caused the IDE no longer to find the COM port for programming. Forcing the board in the bootloader (pressing the reset button twice fast) allowed me to upload new firmware again.
Not sure what the behaviour would be on your Mac.

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@basevers I have not made progress, no. I'll give that change a shot and see how it works on the Mac this afternoon.

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@basevers So it looks like I may have already had that change in my USBCore.h file, or it's already in there for me. It's also possible I misunderstood your change, so here is what my line looks like:

#define D_DEVICE(_class,_subClass,_proto,_packetSize0,_vid,_pid,_version,_im,_ip,_is,_configs) \
	{ 18, 1, USB_VERSION, _class,_subClass,_proto,_packetSize0,_vid,_pid,_version,_im,_ip,_is,_configs }

I believe that is only for the AVR cores though, so I don't think that affects the Cortex M0-based boards anyway.

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Any solution to change the USB_VERSION to 0x210 on SAMD boards ?

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Hello, After a solution as well, tried changing the USB version with no success, CDC doesn't mount. Tried on a metro M0 express for a project at work, no dice. Anything to alter in the core ?

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Hello, I've also tried with an Arduino 33 IOT, changing the USB version as mention, but no chance to run WebUsb. Does someone already succeeded ?

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