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+/*!
+    \file    cdc_acm_core.h
+    \brief   the header file of cdc acm driver
+
+    \version 2026-02-05, V3.3.3, firmware for GD32F4xx
+*/
+
+/*
+    Copyright (c) 2026, GigaDevice Semiconductor Inc.
+
+    Redistribution and use in source and binary forms, with or without modification, 
+are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice, this 
+       list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright notice, 
+       this list of conditions and the following disclaimer in the documentation 
+       and/or other materials provided with the distribution.
+    3. Neither the name of the copyright holder nor the names of its contributors 
+       may be used to endorse or promote products derived from this software without 
+       specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
+IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
+INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
+NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
+WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
+OF SUCH DAMAGE.
+*/
+
+#ifndef CDC_ACM_CORE_H
+#define CDC_ACM_CORE_H
+
+#include "usbd_enum.h"
+#include "usb_cdc.h"
+
+#define USB_CDC_RX_LEN      USB_CDC_DATA_PACKET_SIZE                         /*< CDC data packet size */
+
+typedef struct {
+    uint8_t data[USB_CDC_RX_LEN];                                            /*< CDC data transfer buff */
+    uint8_t cmd[USB_CDC_CMD_PACKET_SIZE];                                    /*< CDC cmd packet buff */
+
+    uint8_t packet_sent;                                                     /*< CDC data packet start send flag */
+    uint8_t packet_receive;                                                  /*< CDC data packet start receive flag */
+    uint32_t receive_length;                                                 /*< CDC data receive length */
+
+    acm_line line_coding;                                                    /*< CDC line coding structure */
+} usb_cdc_handler;
+
+extern usb_desc cdc_desc;
+extern usb_class_core cdc_class;
+
+/* function declarations */
+/* check CDC ACM is ready for data transfer */
+uint8_t cdc_acm_check_ready(usb_dev *udev);
+/* send CDC ACM data */
+void cdc_acm_data_send(usb_dev *udev);
+/* receive CDC ACM data */
+void cdc_acm_data_receive(usb_dev *udev);
+
+#endif /* CDC_ACM_CORE_H */