This is an application example using ST Nucleo F103 board.
SB62 and SB63 should be soldered.
ST-Link/V2 is disconnected (SB13 and SB14).
TODO:
* serial config setting
* CTSRTS? How by USB? By vendor specific control?
* stats report control
* USB communication class interface notification (interrupt ENDP2) support
SERIAL_STATE
* SEND_BREAK support
* Use of DMA for serial communication
* RS-232 support: GPIO with DTR (out), DCD (in), DSR (in), RI (in)
* Half-duplex support
* Support of other communication mode: smartcard, IrDA, etc.
