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usb-device-cdc raises TypeError when using default timeout of None and going to block #993
Description
https://github.com/micropython/micropython-lib/blob/master/micropython/usb/usb-device-cdc/usb/device/cdc.py#L368
and same for read function.
# check for timeout
if time.ticks_diff(time.ticks_ms(), start) >= self._timeout:
return len(buf) - len(mv)
machine.idle()should be something like this:
if isinstance(self._timeout, int) and time.ticks_diff(time.ticks_ms(), start) >= self._timeout:
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