Commit d6da573

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usbd: Implement USB-CDC serial class.

This is a squash of commits from branch feature/usbd_python_cdc which includes an initial implementation by @hoihu and bug fixes from @linted. Includes: - Some usbd device behaviour changes to manage transfers. - A new reader/writer "Buffer" class designed for providing buffered data to/from TinyUSB. - cdc_example.py opens a REPL on the dynamic USB CDC interface. - cdc_rate_benchmark.py is an update of the original PyBoard VCP benchmark code. Parts of this work was funded through GitHub Sponsors. Signed-off-by: Angus Gratton <angus@redyak.com.au>

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micropython/usbd

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`‎micropython/usbd/init.py`

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 from .device import get_usbdevice, USBInterface
 from .hid import HIDInterface, MouseInterface
 from .midi import DummyAudioInterface, MIDIInterface, MidiUSB
 +from .cdc import CDC
 from . import utils

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