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CPU_INT08U  USBD_CDC_Add(CPU_INT08U              subclass,
                         USBD_CDC_SUBCLASS_DRV  *p_subclass_drv,
                         void                   *p_subclass_arg,
                         CPU_INT08U              protocol,
                         CPU_BOOLEAN             notify_en,
                         CPU_INT16U              notify_interval,
                         USBD_ERR               *p_err);