USB device stack for NUCLEO-F042K6, NUCLEO-L152RE and NUCLEO-F103RB.

Dependents:   LPE-SEM01

Fork of L152RE_USBDevice by Norimasa Okamoto

Add STM32F3 support

I'm using your USB device library on an STM32F3Discovery board, and it required a few minor changes

USBDevice with support for STM32F3