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Update USB implementation, fix 64 bytes bug #45

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@qbolsee qbolsee commented Jul 15, 2021

This is a bugfix for a specific issue when sending exactly 64 bytes to the USB CDC. It seems the bytes were stuck in a buffer which was only released when reaching 256 bytes. I can upload a test case that demonstrates this if needed.

Updating SAMD21_USBDevice.h to the version from the official Arduino Core fixed the issue.

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