from usbh_def.h:280
typedef struct _InterfaceDescriptor
{
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bInterfaceNumber;
uint8_t bAlternateSetting;
uint8_t bNumEndpoints;
uint8_t bInterfaceClass;
uint8_t bInterfaceSubClass;
uint8_t bInterfaceProtocol;
uint8_t iInterface;
USBH_EpDescTypeDef Ep_Desc[USBH_MAX_NUM_ENDPOINTS];
}
USBH_InterfaceDescTypeDef;