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void  USBD_Vendor_RdAsync (CPU_INT08U               class_nbr,
                           void                    *p_buf,
                           CPU_INT32U               buf_len,
                           USBD_VENDOR_ASYNC_FNCT   async_fnct,
                           void                    *p_async_arg,
                           USBD_ERR                *p_err);