#define USBDEV_VERSION_MAJOR 0
#define USBDEV_VERSION_MINOR 2

#define USBCMD_ECHO    0
#define USBCMD_GETPORT 1
#define USBCMD_SETPORT 2
#define USBCMD_SETBITS 3
#define USBCMD_START   4
#define USBCMD_STOP    5
#define USBCMD_TX      6
#define USBCMD_RX      7