Serial test fails with timeout if USB 3.0 port is used to communicate with a HighSpeed device

[Disasm]

Tested with the STM32F723E-DISCO board and the following example: https://github.com/Disasm/usb-otg-workspace/blob/master/example-f723e-disco-board/examples/serial.rs serial-threadmark tool was used to feed data to the serial port.

Affected versions: at least 0.2.4 and 0.3.2. Same problem can be reproduced also with the XCore407I board.