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CPU_INT08U  USBD_PHDC_PreambleRd (CPU_INT08U   class_nbr,
                                  void        *p_buf,
                                  CPU_INT08U   buf_len,
                                  CPU_INT08U  *p_nbr_xfer,
                                  CPU_INT16U   timeout,
                                  USBD_ERR    *p_err);