• USB Composite 组合设备之多路CDC实现

    USB Composite 组合设备之多路CDC实现

    USB复合设备与组合设备区别

    其实多个接口组合在一起有2种情况
    第一种叫做USB复合设备（Compound Device）：
    就是此类设备内部会集成一个HUD，然后多个USB连接到此HUD上，然后每个USB都会有自己独立的PID、VID
    第二种叫做USB组合设备（Composite Device）：
    此类设备则内部只有一个PID、VID，通过定义多个接口描述符来实现多个功能的组合
    参考原文链接

    效果展示

    请添加图片描述

    修改相关配置

    修改配置项

    usbd_conf.h

    #define USBD_MAX_NUM_INTERFACES     6U

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    修改设备描述符

    usbd_desc.c

    __ALIGN_BEGIN uint8_t USBD_FS_DeviceDesc[USB_LEN_DEV_DESC] __ALIGN_END =
{
  0x12,                       /*bLength */
  USB_DESC_TYPE_DEVICE,       /*bDescriptorType*/
  0x00,                       /*bcdUSB */
  0x02,
  0xEF,                       /*bDeviceClass*/
  0x02,                       /*bDeviceSubClass*/
  0x01,                       /*bDeviceProtocol*/
  // 0x02,                       /*bDeviceClass*/
  // 0x02,                       /*bDeviceSubClass*/
  // 0x00,                       /*bDeviceProtocol*/
  USB_MAX_EP0_SIZE,           /*bMaxPacketSize*/
  LOBYTE(USBD_VID),           /*idVendor*/
  HIBYTE(USBD_VID),           /*idVendor*/
  LOBYTE(USBD_PID_FS),        /*idProduct*/
  HIBYTE(USBD_PID_FS),        /*idProduct*/
  0x00,                       /*bcdDevice rel. 2.00*/
  0x02,
  USBD_IDX_MFC_STR,           /*Index of manufacturer  string*/
  USBD_IDX_PRODUCT_STR,       /*Index of product string*/
  USBD_IDX_SERIAL_STR,        /*Index of serial number string*/
  USBD_MAX_NUM_CONFIGURATION  /*bNumConfigurations*/
};

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    修改配置、接口、端点描述符

    usbd_cdc.h

    头文件增加了：多路串口的宏定义
    修改了：发送接收接口函数声明

    
/**
  ******************************************************************************
  * @file    usbd_cdc.h
  * @author  MCD Application Team
  * @brief   header file for the usbd_cdc.c file.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2015 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */

/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef __USB_CDC_H
#define __USB_CDC_H

#ifdef __cplusplus
extern "C" {
#endif

/* Includes ------------------------------------------------------------------*/
#include  "usbd_ioreq.h"

/** @addtogroup STM32_USB_DEVICE_LIBRARY
  * @{
  */

/** @defgroup usbd_cdc
  * @brief This file is the Header file for usbd_cdc.c
  * @{
  */


/** @defgroup usbd_cdc_Exported_Defines
  * @{
  */
#ifndef CDC_IN_EP
#define CDC_IN_EP                                   0x81U  /* EP1 for data IN */
#endif /* CDC_IN_EP */
#ifndef CDC_OUT_EP
#define CDC_OUT_EP                                  0x01U  /* EP1 for data OUT */
#endif /* CDC_OUT_EP */
#ifndef CDC_CMD_EP
#define CDC_CMD_EP                                  0x84U  /* EP4 for CDC commands */
#endif /* CDC_CMD_EP  */

/* 2 路 USB CDC */
#define USE_CDC_IAD                                 1       /**< 使用多路CDC使能 */
#define USE_CDC_NUM                                 3       /**< 使用2路 or 3路 */
#ifndef CDC_IN_EP2
#define CDC_IN_EP2                                   0x82U  /* EP2 for data IN */
#endif /* CDC_IN_EP */
#ifndef CDC_OUT_EP2
#define CDC_OUT_EP2                                  0x02U  /* EP2 for data OUT */
#endif /* CDC_OUT_EP */
#ifndef CDC_CMD_EP5
#define CDC_CMD_EP5                                  0x85U  /* EP5 for CDC commands */
#endif /* CDC_CMD_EP  */

#ifndef CDC_IN_EP3
#define CDC_IN_EP3                                   0x83U  /* EP3 for data IN */
#endif /* CDC_IN_EP */
#ifndef CDC_OUT_EP3
#define CDC_OUT_EP3                                  0x03U  /* EP3 for data OUT */
#endif /* CDC_OUT_EP */
#ifndef CDC_CMD_EP6
#define CDC_CMD_EP6                                  0x86U  /* EP6 for CDC commands */
#endif /* CDC_CMD_EP  */

#ifndef CDC_HS_BINTERVAL
#define CDC_HS_BINTERVAL                            0x10U
#endif /* CDC_HS_BINTERVAL */

#ifndef CDC_FS_BINTERVAL
#define CDC_FS_BINTERVAL                            0x10U
#endif /* CDC_FS_BINTERVAL */

/* CDC Endpoints parameters: you can fine tune these values depending on the needed baudrates and performance. */
#define CDC_DATA_HS_MAX_PACKET_SIZE                 512U  /* Endpoint IN & OUT Packet size */
#define CDC_DATA_FS_MAX_PACKET_SIZE                 64U  /* Endpoint IN & OUT Packet size */
#define CDC_CMD_PACKET_SIZE                         8U  /* Control Endpoint Packet size */

#if USE_CDC_IAD && USE_CDC_NUM == 2
  #define USB_CDC_CONFIG_DESC_SIZ                     ((67U - 9U + 8U) * 2U + 9U)
#elif USE_CDC_IAD && USE_CDC_NUM == 3
  #define USB_CDC_CONFIG_DESC_SIZ                     ((67U - 9U + 8U) * 3U + 9U)
#else
  #define USB_CDC_CONFIG_DESC_SIZ                     67U
#endif


#define CDC_DATA_HS_IN_PACKET_SIZE                  CDC_DATA_HS_MAX_PACKET_SIZE
#define CDC_DATA_HS_OUT_PACKET_SIZE                 CDC_DATA_HS_MAX_PACKET_SIZE

#define CDC_DATA_FS_IN_PACKET_SIZE                  CDC_DATA_FS_MAX_PACKET_SIZE
#define CDC_DATA_FS_OUT_PACKET_SIZE                 CDC_DATA_FS_MAX_PACKET_SIZE

#define CDC_REQ_MAX_DATA_SIZE                       0x7U
/*---------------------------------------------------------------------*/
/*  CDC definitions                                                    */
/*---------------------------------------------------------------------*/
#define CDC_SEND_ENCAPSULATED_COMMAND               0x00U
#define CDC_GET_ENCAPSULATED_RESPONSE               0x01U
#define CDC_SET_COMM_FEATURE                        0x02U
#define CDC_GET_COMM_FEATURE                        0x03U
#define CDC_CLEAR_COMM_FEATURE                      0x04U
#define CDC_SET_LINE_CODING                         0x20U
#define CDC_GET_LINE_CODING                         0x21U
#define CDC_SET_CONTROL_LINE_STATE                  0x22U
#define CDC_SEND_BREAK                              0x23U

/**
  * @}
  */


/** @defgroup USBD_CORE_Exported_TypesDefinitions
  * @{
  */

/**
  * @}
  */
typedef struct
{
  uint32_t bitrate;
  uint8_t  format;
  uint8_t  paritytype;
  uint8_t  datatype;
} USBD_CDC_LineCodingTypeDef;

typedef struct _USBD_CDC_Itf
{
  int8_t (* Init)(void);
  int8_t (* DeInit)(void);
  int8_t (* Control)(uint8_t cmd, uint8_t *pbuf, uint16_t length);
  int8_t (* Receive)(uint8_t *Buf, uint32_t *Len, uint8_t epnum);
  int8_t (* TransmitCplt)(uint8_t *Buf, uint32_t *Len, uint8_t epnum);
} USBD_CDC_ItfTypeDef;


typedef struct
{
  uint32_t data[CDC_DATA_HS_MAX_PACKET_SIZE / 4U];      /* Force 32-bit alignment */
  uint8_t  CmdOpCode;
  uint8_t  CmdLength;
  uint8_t  *RxBuffer;
  uint8_t  *TxBuffer;
  uint32_t RxLength;
  uint32_t TxLength;

  __IO uint32_t TxState;
  __IO uint32_t RxState;
} USBD_CDC_HandleTypeDef;



/** @defgroup USBD_CORE_Exported_Macros
  * @{
  */

/**
  * @}
  */

/** @defgroup USBD_CORE_Exported_Variables
  * @{
  */

extern USBD_ClassTypeDef USBD_CDC;
#define USBD_CDC_CLASS &USBD_CDC
/**
  * @}
  */

/** @defgroup USB_CORE_Exported_Functions
  * @{
  */
uint8_t USBD_CDC_RegisterInterface(USBD_HandleTypeDef *pdev,
                                   USBD_CDC_ItfTypeDef *fops);

uint8_t USBD_CDC_SetTxBuffer(USBD_HandleTypeDef *pdev, uint8_t *pbuff,
                             uint32_t length);

uint8_t USBD_CDC_SetRxBuffer(USBD_HandleTypeDef *pdev, uint8_t *pbuff);
uint8_t USBD_CDC_ReceivePacket(USBD_HandleTypeDef *pdev, uint8_t epnum);
uint8_t USBD_CDC_TransmitPacket(USBD_HandleTypeDef *pdev, uint8_t epnum);
/**
  * @}
  */

#ifdef __cplusplus
}
#endif

#endif  /* __USB_CDC_H */
/**
  * @}
  */

/**
  * @}
  */


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    usbd_cdc.c

    1、修改了描述符，8个字节IAD描述符 * 3、2路接口配置
    2、修改了初始化函数，反初始化函数接口
    3、修改了数据流转接口增加了端点地址参数

    /**
  ******************************************************************************
  * @file    usbd_cdc.c
  * @author  MCD Application Team
  * @brief   This file provides the high layer firmware functions to manage the
  *          following functionalities of the USB CDC Class:
  *           - Initialization and Configuration of high and low layer
  *           - Enumeration as CDC Device (and enumeration for each implemented memory interface)
  *           - OUT/IN data transfer
  *           - Command IN transfer (class requests management)
  *           - Error management
  *
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2015 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  *  @verbatim
  *
  *          ===================================================================
  *                                CDC Class Driver Description
  *          ===================================================================
  *           This driver manages the "Universal Serial Bus Class Definitions for Communications Devices
  *           Revision 1.2 November 16, 2007" and the sub-protocol specification of "Universal Serial Bus
  *           Communications Class Subclass Specification for PSTN Devices Revision 1.2 February 9, 2007"
  *           This driver implements the following aspects of the specification:
  *             - Device descriptor management
  *             - Configuration descriptor management
  *             - Enumeration as CDC device with 2 data endpoints (IN and OUT) and 1 command endpoint (IN)
  *             - Requests management (as described in section 6.2 in specification)
  *             - Abstract Control Model compliant
  *             - Union Functional collection (using 1 IN endpoint for control)
  *             - Data interface class
  *
  *           These aspects may be enriched or modified for a specific user application.
  *
  *            This driver doesn't implement the following aspects of the specification
  *            (but it is possible to manage these features with some modifications on this driver):
  *             - Any class-specific aspect relative to communication classes should be managed by user application.
  *             - All communication classes other than PSTN are not managed
  *
  *  @endverbatim
  *
  ******************************************************************************
  */

/* BSPDependencies
- "stm32xxxxx_{eval}{discovery}{nucleo_144}.c"
- "stm32xxxxx_{eval}{discovery}_io.c"
EndBSPDependencies */

/* Includes ------------------------------------------------------------------*/
#include "usbd_cdc.h"
#include "usbd_ctlreq.h"


/** @addtogroup STM32_USB_DEVICE_LIBRARY
  * @{
  */


/** @defgroup USBD_CDC
  * @brief usbd core module
  * @{
  */

/** @defgroup USBD_CDC_Private_TypesDefinitions
  * @{
  */
/**
  * @}
  */


/** @defgroup USBD_CDC_Private_Defines
  * @{
  */
/**
  * @}
  */


/** @defgroup USBD_CDC_Private_Macros
  * @{
  */

/**
  * @}
  */


/** @defgroup USBD_CDC_Private_FunctionPrototypes
  * @{
  */

static uint8_t USBD_CDC_Init(USBD_HandleTypeDef *pdev, uint8_t cfgidx);
static uint8_t USBD_CDC_DeInit(USBD_HandleTypeDef *pdev, uint8_t cfgidx);
static uint8_t USBD_CDC_Setup(USBD_HandleTypeDef *pdev, USBD_SetupReqTypedef *req);
static uint8_t USBD_CDC_DataIn(USBD_HandleTypeDef *pdev, uint8_t epnum);
static uint8_t USBD_CDC_DataOut(USBD_HandleTypeDef *pdev, uint8_t epnum);
static uint8_t USBD_CDC_EP0_RxReady(USBD_HandleTypeDef *pdev);
#ifndef USE_USBD_COMPOSITE
static uint8_t *USBD_CDC_GetFSCfgDesc(uint16_t *length);
static uint8_t *USBD_CDC_GetHSCfgDesc(uint16_t *length);
static uint8_t *USBD_CDC_GetOtherSpeedCfgDesc(uint16_t *length);
static uint8_t *USBD_CDC_GetOtherSpeedCfgDesc(uint16_t *length);
uint8_t *USBD_CDC_GetDeviceQualifierDescriptor(uint16_t *length);
#endif /* USE_USBD_COMPOSITE  */

#ifndef USE_USBD_COMPOSITE
/* USB Standard Device Descriptor */
__ALIGN_BEGIN static uint8_t USBD_CDC_DeviceQualifierDesc[USB_LEN_DEV_QUALIFIER_DESC] __ALIGN_END =
{
  USB_LEN_DEV_QUALIFIER_DESC,
  USB_DESC_TYPE_DEVICE_QUALIFIER,
  0x00,
  0x02,
  0x00,
  0x00,
  0x00,
  0x40,
  0x01,
  0x00,
};
#endif /* USE_USBD_COMPOSITE  */
/**
  * @}
  */

/** @defgroup USBD_CDC_Private_Variables
  * @{
  */


/* CDC interface class callbacks structure */
USBD_ClassTypeDef  USBD_CDC =
{
  USBD_CDC_Init,
  USBD_CDC_DeInit,
  USBD_CDC_Setup,
  NULL,                 /* EP0_TxSent */
  USBD_CDC_EP0_RxReady,
  USBD_CDC_DataIn,
  USBD_CDC_DataOut,
  NULL,
  NULL,
  NULL,
#ifdef USE_USBD_COMPOSITE
  NULL,
  NULL,
  NULL,
  NULL,
#else
  USBD_CDC_GetHSCfgDesc,
  USBD_CDC_GetFSCfgDesc,
  USBD_CDC_GetOtherSpeedCfgDesc,
  USBD_CDC_GetDeviceQualifierDescriptor,
#endif /* USE_USBD_COMPOSITE  */
};

#ifndef USE_USBD_COMPOSITE
/* USB CDC device Configuration Descriptor */
__ALIGN_BEGIN static uint8_t USBD_CDC_CfgDesc[USB_CDC_CONFIG_DESC_SIZ] __ALIGN_END =
{
  /* Configuration Descriptor */
  0x09,                                       /* bLength: Configuration Descriptor size */
  USB_DESC_TYPE_CONFIGURATION,                /* bDescriptorType: Configuration */
  USB_CDC_CONFIG_DESC_SIZ,                    /* wTotalLength */
  0x00,
#if USE_CDC_IAD && USE_CDC_NUM == 2
  0x02 * 2,                                   /* bNumInterfaces: 2 interfaces */
#elif USE_CDC_IAD && USE_CDC_NUM == 3
  0x02 * 3,                                   /* bNumInterfaces: 2 interfaces */
#else
  0x02,                                       /* bNumInterfaces: 2 interfaces */
#endif
  0x01,                                       /* bConfigurationValue: Configuration value */
  0x00,                                       /* iConfiguration: Index of string descriptor
                                                 describing the configuration */
#if (USBD_SELF_POWERED == 1U)
  0xC0,                                       /* bmAttributes: Bus Powered according to user configuration */
#else
  0x80,                                       /* bmAttributes: Bus Powered according to user configuration */
#endif /* USBD_SELF_POWERED */
  USBD_MAX_POWER,                             /* MaxPower (mA) */

  /*---------------------------------------------------------------------------*/
#if USE_CDC_IAD && USE_CDC_NUM >= 2
/* Interface Association Descriptor IAD描述符 -- 控制接口 0 */
  0x08,                                 /* bLength IAD描述符大小 */
  0x0B,                                 /* bDescriptorType IAD描述符类型 */
  0x00,                                 /* bFirstInterface 该IAD所聚合的多个接口中，首个索引编号 */
  0x02,                                 /* bInferfaceCount 该功能包含接口的数目 */
  0x02,                                 /* bFunctionClass 建议使用该IAD所聚合的多个interface中的第一个interface的对应参数，设备符中的bDeviceClass */
  0x02,                                 /* bFunctionSubClass 建议使用该IAD所聚合的多个interface中的第一个interface的对应参数，设备符中的bDeviceSubClass */
  0x01,                                 /* bFunctionProtocol 建议使用该IAD所聚合的多个interface中的第一个interface的对应参数，设备符中的bDeviceProtocol */
  0x00,                                 /* iFunction 描述该功能的字符串编号 */
  /* 08 byte*/
#endif
  /* Interface Descriptor */
  0x09,                                       /* bLength: Interface Descriptor size */
  USB_DESC_TYPE_INTERFACE,                    /* bDescriptorType: Interface */
  /* Interface descriptor type */
  0x00,                                       /* bInterfaceNumber: Number of Interface */
  0x00,                                       /* bAlternateSetting: Alternate setting */
  0x01,                                       /* bNumEndpoints: One endpoint used */
  0x02,                                       /* bInterfaceClass: Communication Interface Class */
  0x02,                                       /* bInterfaceSubClass: Abstract Control Model */
  0x01,                                       /* bInterfaceProtocol: Common AT commands */
  0x00,                                       /* iInterface */

  /* Header Functional Descriptor */
  0x05,                                       /* bLength: Endpoint Descriptor size */
  0x24,                                       /* bDescriptorType: CS_INTERFACE */
  0x00,                                       /* bDescriptorSubtype: Header Func Desc */
  0x10,                                       /* bcdCDC: spec release number */
  0x01,

  /* Call Management Functional Descriptor */
  0x05,                                       /* bFunctionLength */
  0x24,                                       /* bDescriptorType: CS_INTERFACE */
  0x01,                                       /* bDescriptorSubtype: Call Management Func Desc */
  0x00,                                       /* bmCapabilities: D0+D1 */
  0x01,                                       /* bDataInterface */

  /* ACM Functional Descriptor */
  0x04,                                       /* bFunctionLength */
  0x24,                                       /* bDescriptorType: CS_INTERFACE */
  0x02,                                       /* bDescriptorSubtype: Abstract Control Management desc */
  0x02,                                       /* bmCapabilities */

  /* Union Functional Descriptor */
  0x05,                                       /* bFunctionLength */
  0x24,                                       /* bDescriptorType: CS_INTERFACE */
  0x06,                                       /* bDescriptorSubtype: Union func desc */
  0x00,                                       /* bMasterInterface: Communication class interface */
  0x01,                                       /* bSlaveInterface0: Data Class Interface */

  /* Endpoint 2 Descriptor */
  0x07,                                       /* bLength: Endpoint Descriptor size */
  USB_DESC_TYPE_ENDPOINT,                     /* bDescriptorType: Endpoint */
  CDC_CMD_EP,                                 /* bEndpointAddress */
  0x03,                                       /* bmAttributes: Interrupt */
  LOBYTE(CDC_CMD_PACKET_SIZE),                /* wMaxPacketSize */
  HIBYTE(CDC_CMD_PACKET_SIZE),
  CDC_FS_BINTERVAL,                           /* bInterval */
  /*---------------------------------------------------------------------------*/

  /* Data class interface descriptor */
  0x09,                                       /* bLength: Endpoint Descriptor size */
  USB_DESC_TYPE_INTERFACE,                    /* bDescriptorType: */
  0x01,                                       /* bInterfaceNumber: Number of Interface */
  0x00,                                       /* bAlternateSetting: Alternate setting */
  0x02,                                       /* bNumEndpoints: Two endpoints used */
  0x0A,                                       /* bInterfaceClass: CDC */
  0x00,                                       /* bInterfaceSubClass */
  0x00,                                       /* bInterfaceProtocol */
  0x00,                                       /* iInterface */

  /* Endpoint OUT Descriptor */
  0x07,                                       /* bLength: Endpoint Descriptor size */
  USB_DESC_TYPE_ENDPOINT,                     /* bDescriptorType: Endpoint */
  CDC_OUT_EP,                                 /* bEndpointAddress */
  0x02,                                       /* bmAttributes: Bulk */
  LOBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),        /* wMaxPacketSize */
  HIBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),
  0x00,                                       /* bInterval */

  /* Endpoint IN Descriptor */
  0x07,                                       /* bLength: Endpoint Descriptor size */
  USB_DESC_TYPE_ENDPOINT,                     /* bDescriptorType: Endpoint */
  CDC_IN_EP,                                  /* bEndpointAddress */
  0x02,                                       /* bmAttributes: Bulk */
  LOBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),        /* wMaxPacketSize */
  HIBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),
  0x00,                                       /* bInterval */

#if USE_CDC_IAD && USE_CDC_NUM >= 2
/* Interface Association Descriptor IAD描述符 -- 控制接口 0 */
  0x08,                                 /* bLength IAD描述符大小 */
  0x0B,                                 /* bDescriptorType IAD描述符类型 */
  0x02,                                 /* bFirstInterface 该IAD所聚合的多个接口中，首个索引编号 */
  0x02,                                 /* bInferfaceCount 该功能包含接口的数目 */
  0x02,                                 /* bFunctionClass 建议使用该IAD所聚合的多个interface中的第一个interface的对应参数，设备符中的bDeviceClass */
  0x02,                                 /* bFunctionSubClass 建议使用该IAD所聚合的多个interface中的第一个interface的对应参数，设备符中的bDeviceSubClass */
  0x01,                                 /* bFunctionProtocol 建议使用该IAD所聚合的多个interface中的第一个interface的对应参数，设备符中的bDeviceProtocol */
  0x00,                                 /* iFunction 描述该功能的字符串编号 */
  /* 08 byte*/

  /* Interface Descriptor */
  0x09,                                       /* bLength: Interface Descriptor size */
  USB_DESC_TYPE_INTERFACE,                    /* bDescriptorType: Interface */
  /* Interface descriptor type */
  0x02,                                       /* bInterfaceNumber: Number of Interface */
  0x00,                                       /* bAlternateSetting: Alternate setting */
  0x01,                                       /* bNumEndpoints: One endpoint used */
  0x02,                                       /* bInterfaceClass: Communication Interface Class */
  0x02,                                       /* bInterfaceSubClass: Abstract Control Model */
  0x01,                                       /* bInterfaceProtocol: Common AT commands */
  0x00,                                       /* iInterface */

  /* Header Functional Descriptor */
  0x05,                                       /* bLength: Endpoint Descriptor size */
  0x24,                                       /* bDescriptorType: CS_INTERFACE */
  0x00,                                       /* bDescriptorSubtype: Header Func Desc */
  0x10,                                       /* bcdCDC: spec release number */
  0x01,

  /* Call Management Functional Descriptor */
  0x05,                                       /* bFunctionLength */
  0x24,                                       /* bDescriptorType: CS_INTERFACE */
  0x01,                                       /* bDescriptorSubtype: Call Management Func Desc */
  0x00,                                       /* bmCapabilities: D0+D1 */
  0x01,                                       /* bDataInterface */

  /* ACM Functional Descriptor */
  0x04,                                       /* bFunctionLength */
  0x24,                                       /* bDescriptorType: CS_INTERFACE */
  0x02,                                       /* bDescriptorSubtype: Abstract Control Management desc */
  0x02,                                       /* bmCapabilities */

  /* Union Functional Descriptor */
  0x05,                                       /* bFunctionLength */
  0x24,                                       /* bDescriptorType: CS_INTERFACE */
  0x06,                                       /* bDescriptorSubtype: Union func desc */
  0x02,                                       /* bMasterInterface: Communication class interface */
  0x03,                                       /* bSlaveInterface0: Data Class Interface */

  /* Endpoint 2 Descriptor */
  0x07,                                       /* bLength: Endpoint Descriptor size */
  USB_DESC_TYPE_ENDPOINT,                     /* bDescriptorType: Endpoint */
  CDC_CMD_EP5,                                /* bEndpointAddress */
  0x03,                                       /* bmAttributes: Interrupt */
  LOBYTE(CDC_CMD_PACKET_SIZE),                /* wMaxPacketSize */
  HIBYTE(CDC_CMD_PACKET_SIZE),
  CDC_FS_BINTERVAL,                           /* bInterval */
  /*---------------------------------------------------------------------------*/

  /* Data class interface descriptor */
  0x09,                                       /* bLength: Endpoint Descriptor size */
  USB_DESC_TYPE_INTERFACE,                    /* bDescriptorType: */
  0x03,                                       /* bInterfaceNumber: Number of Interface */
  0x00,                                       /* bAlternateSetting: Alternate setting */
  0x02,                                       /* bNumEndpoints: Two endpoints used */
  0x0A,                                       /* bInterfaceClass: CDC */
  0x00,                                       /* bInterfaceSubClass */
  0x00,                                       /* bInterfaceProtocol */
  0x00,                                       /* iInterface */

  /* Endpoint OUT Descriptor */
  0x07,                                       /* bLength: Endpoint Descriptor size */
  USB_DESC_TYPE_ENDPOINT,                     /* bDescriptorType: Endpoint */
  CDC_OUT_EP2,                                /* bEndpointAddress */
  0x02,                                       /* bmAttributes: Bulk */
  LOBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),        /* wMaxPacketSize */
  HIBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),
  0x00,                                       /* bInterval */

  /* Endpoint IN Descriptor */
  0x07,                                       /* bLength: Endpoint Descriptor size */
  USB_DESC_TYPE_ENDPOINT,                     /* bDescriptorType: Endpoint */
  CDC_IN_EP2,                                 /* bEndpointAddress */
  0x02,                                       /* bmAttributes: Bulk */
  LOBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),        /* wMaxPacketSize */
  HIBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),
  0x00,                                       /* bInterval */
#endif

#if USE_CDC_IAD && USE_CDC_NUM >= 3
/* Interface Association Descriptor IAD描述符 -- 控制接口 0 */
  0x08,                                 /* bLength IAD描述符大小 */
  0x0B,                                 /* bDescriptorType IAD描述符类型 */
  0x04,                                 /* bFirstInterface 该IAD所聚合的多个接口中，首个索引编号 */
  0x02,                                 /* bInferfaceCount 该功能包含接口的数目 */
  0x02,                                 /* bFunctionClass 建议使用该IAD所聚合的多个interface中的第一个interface的对应参数，设备符中的bDeviceClass */
  0x02,                                 /* bFunctionSubClass 建议使用该IAD所聚合的多个interface中的第一个interface的对应参数，设备符中的bDeviceSubClass */
  0x01,                                 /* bFunctionProtocol 建议使用该IAD所聚合的多个interface中的第一个interface的对应参数，设备符中的bDeviceProtocol */
  0x00,                                 /* iFunction 描述该功能的字符串编号 */
  /* 08 byte*/

  /* Interface Descriptor */
  0x09,                                       /* bLength: Interface Descriptor size */
  USB_DESC_TYPE_INTERFACE,                    /* bDescriptorType: Interface */
  /* Interface descriptor type */
  0x04,                                       /* bInterfaceNumber: Number of Interface */
  0x00,                                       /* bAlternateSetting: Alternate setting */
  0x01,                                       /* bNumEndpoints: One endpoint used */
  0x02,                                       /* bInterfaceClass: Communication Interface Class */
  0x02,                                       /* bInterfaceSubClass: Abstract Control Model */
  0x01,                                       /* bInterfaceProtocol: Common AT commands */
  0x00,                                       /* iInterface */

  /* Header Functional Descriptor */
  0x05,                                       /* bLength: Endpoint Descriptor size */
  0x24,                                       /* bDescriptorType: CS_INTERFACE */
  0x00,                                       /* bDescriptorSubtype: Header Func Desc */
  0x10,                                       /* bcdCDC: spec release number */
  0x01,

  /* Call Management Functional Descriptor */
  0x05,                                       /* bFunctionLength */
  0x24,                                       /* bDescriptorType: CS_INTERFACE */
  0x01,                                       /* bDescriptorSubtype: Call Management Func Desc */
  0x00,                                       /* bmCapabilities: D0+D1 */
  0x01,                                       /* bDataInterface */

  /* ACM Functional Descriptor */
  0x04,                                       /* bFunctionLength */
  0x24,                                       /* bDescriptorType: CS_INTERFACE */
  0x02,                                       /* bDescriptorSubtype: Abstract Control Management desc */
  0x02,                                       /* bmCapabilities */

  /* Union Functional Descriptor */
  0x05,                                       /* bFunctionLength */
  0x24,                                       /* bDescriptorType: CS_INTERFACE */
  0x06,                                       /* bDescriptorSubtype: Union func desc */
  0x04,                                       /* bMasterInterface: Communication class interface */
  0x05,                                       /* bSlaveInterface0: Data Class Interface */

  /* Endpoint 2 Descriptor */
  0x07,                                       /* bLength: Endpoint Descriptor size */
  USB_DESC_TYPE_ENDPOINT,                     /* bDescriptorType: Endpoint */
  CDC_CMD_EP6,                                /* bEndpointAddress */
  0x03,                                       /* bmAttributes: Interrupt */
  LOBYTE(CDC_CMD_PACKET_SIZE),                /* wMaxPacketSize */
  HIBYTE(CDC_CMD_PACKET_SIZE),
  CDC_FS_BINTERVAL,                           /* bInterval */
  /*---------------------------------------------------------------------------*/

  /* Data class interface descriptor */
  0x09,                                       /* bLength: Endpoint Descriptor size */
  USB_DESC_TYPE_INTERFACE,                    /* bDescriptorType: */
  0x05,                                       /* bInterfaceNumber: Number of Interface */
  0x00,                                       /* bAlternateSetting: Alternate setting */
  0x02,                                       /* bNumEndpoints: Two endpoints used */
  0x0A,                                       /* bInterfaceClass: CDC */
  0x00,                                       /* bInterfaceSubClass */
  0x00,                                       /* bInterfaceProtocol */
  0x00,                                       /* iInterface */

  /* Endpoint OUT Descriptor */
  0x07,                                       /* bLength: Endpoint Descriptor size */
  USB_DESC_TYPE_ENDPOINT,                     /* bDescriptorType: Endpoint */
  CDC_OUT_EP3,                                /* bEndpointAddress */
  0x02,                                       /* bmAttributes: Bulk */
  LOBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),        /* wMaxPacketSize */
  HIBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),
  0x00,                                       /* bInterval */

  /* Endpoint IN Descriptor */
  0x07,                                       /* bLength: Endpoint Descriptor size */
  USB_DESC_TYPE_ENDPOINT,                     /* bDescriptorType: Endpoint */
  CDC_IN_EP3,                                 /* bEndpointAddress */
  0x02,                                       /* bmAttributes: Bulk */
  LOBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),        /* wMaxPacketSize */
  HIBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),
  0x00,                                       /* bInterval */
#endif
};
#endif /* USE_USBD_COMPOSITE  */

static uint8_t CDCInEpAdd = CDC_IN_EP;
static uint8_t CDCOutEpAdd = CDC_OUT_EP;
static uint8_t CDCCmdEpAdd = CDC_CMD_EP;

/**
  * @}
  */

/** @defgroup USBD_CDC_Private_Functions
  * @{
  */

/**
  * @brief  USBD_CDC_Init
  *         Initialize the CDC interface
  * @param  pdev: device instance
  * @param  cfgidx: Configuration index
  * @retval status
  */
static uint8_t USBD_CDC_Init(USBD_HandleTypeDef *pdev, uint8_t cfgidx)
{
  UNUSED(cfgidx);
  USBD_CDC_HandleTypeDef *hcdc;
  static uint32_t mem[(sizeof(USBD_CDC_HandleTypeDef)/4)+1];/* On 32-bit boundary */
  hcdc = (USBD_CDC_HandleTypeDef *)mem;//USBD_malloc(sizeof(USBD_CDC_HandleTypeDef));

  if (hcdc == NULL)
  {
    pdev->pClassDataCmsit[pdev->classId] = NULL;
    return (uint8_t)USBD_EMEM;
  }

  (void)USBD_memset(hcdc, 0, sizeof(USBD_CDC_HandleTypeDef));

  pdev->pClassDataCmsit[pdev->classId] = (void *)hcdc;
  pdev->pClassData = pdev->pClassDataCmsit[pdev->classId];

#ifdef USE_USBD_COMPOSITE
  /* Get the Endpoints addresses allocated for this class instance */
  CDCInEpAdd  = USBD_CoreGetEPAdd(pdev, USBD_EP_IN, USBD_EP_TYPE_BULK);
  CDCOutEpAdd = USBD_CoreGetEPAdd(pdev, USBD_EP_OUT, USBD_EP_TYPE_BULK);
  CDCCmdEpAdd = USBD_CoreGetEPAdd(pdev, USBD_EP_IN, USBD_EP_TYPE_INTR);
#endif /* USE_USBD_COMPOSITE */

  if (pdev->dev_speed == USBD_SPEED_HIGH)
  {
    /* CDC1 */
    /* Open EP IN */
    (void)USBD_LL_OpenEP(pdev, CDCInEpAdd, USBD_EP_TYPE_BULK,
                         CDC_DATA_HS_IN_PACKET_SIZE);

    pdev->ep_in[CDCInEpAdd & 0xFU].is_used = 1U;

    /* Open EP OUT */
    (void)USBD_LL_OpenEP(pdev, CDCOutEpAdd, USBD_EP_TYPE_BULK,
                         CDC_DATA_HS_OUT_PACKET_SIZE);

    pdev->ep_out[CDCOutEpAdd & 0xFU].is_used = 1U;

    /* Set bInterval for CDC CMD Endpoint */
    pdev->ep_in[CDCCmdEpAdd & 0xFU].bInterval = CDC_HS_BINTERVAL;
#if USE_CDC_IAD && USE_CDC_NUM >= 2
    /* CDC2 */
    /* Open EP IN */
    (void)USBD_LL_OpenEP(pdev, CDC_IN_EP2, USBD_EP_TYPE_BULK,
                         CDC_DATA_HS_IN_PACKET_SIZE);

    pdev->ep_in[CDC_IN_EP2 & 0xFU].is_used = 1U;

    /* Open EP OUT */
    (void)USBD_LL_OpenEP(pdev, CDC_OUT_EP2, USBD_EP_TYPE_BULK,
                         CDC_DATA_HS_OUT_PACKET_SIZE);

    pdev->ep_out[CDC_OUT_EP2 & 0xFU].is_used = 1U;

    /* Set bInterval for CDC CMD Endpoint */
    pdev->ep_in[CDC_CMD_EP5 & 0xFU].bInterval = CDC_HS_BINTERVAL;
#endif
#if USE_CDC_IAD && USE_CDC_NUM >= 3
    /* CDC3 */
    /* Open EP IN */
    (void)USBD_LL_OpenEP(pdev, CDC_IN_EP3, USBD_EP_TYPE_BULK,
                         CDC_DATA_HS_IN_PACKET_SIZE);

    pdev->ep_in[CDC_IN_EP3 & 0xFU].is_used = 1U;

    /* Open EP OUT */
    (void)USBD_LL_OpenEP(pdev, CDC_OUT_EP3, USBD_EP_TYPE_BULK,
                         CDC_DATA_HS_OUT_PACKET_SIZE);

    pdev->ep_out[CDC_OUT_EP3 & 0xFU].is_used = 1U;

    /* Set bInterval for CDC CMD Endpoint */
    pdev->ep_in[CDC_CMD_EP6 & 0xFU].bInterval = CDC_HS_BINTERVAL;
#endif
  }
  else
  {
    /* Open EP IN */
    (void)USBD_LL_OpenEP(pdev, CDCInEpAdd, USBD_EP_TYPE_BULK,
                         CDC_DATA_FS_IN_PACKET_SIZE);

    pdev->ep_in[CDCInEpAdd & 0xFU].is_used = 1U;

    /* Open EP OUT */
    (void)USBD_LL_OpenEP(pdev, CDCOutEpAdd, USBD_EP_TYPE_BULK,
                         CDC_DATA_FS_OUT_PACKET_SIZE);

    pdev->ep_out[CDCOutEpAdd & 0xFU].is_used = 1U;

    /* Set bInterval for CMD Endpoint */
    pdev->ep_in[CDCCmdEpAdd & 0xFU].bInterval = CDC_FS_BINTERVAL;

#if USE_CDC_IAD && USE_CDC_NUM >= 2
    /* CDC2 */
    /* Open EP IN */
    (void)USBD_LL_OpenEP(pdev, CDC_IN_EP2, USBD_EP_TYPE_BULK,
                         CDC_DATA_FS_IN_PACKET_SIZE);

    pdev->ep_in[CDC_IN_EP2 & 0xFU].is_used = 1U;

    /* Open EP OUT */
    (void)USBD_LL_OpenEP(pdev, CDC_OUT_EP2, USBD_EP_TYPE_BULK,
                         CDC_DATA_FS_OUT_PACKET_SIZE);

    pdev->ep_out[CDC_OUT_EP2 & 0xFU].is_used = 1U;

    /* Set bInterval for CDC CMD Endpoint */
    pdev->ep_in[CDC_CMD_EP5 & 0xFU].bInterval = CDC_FS_BINTERVAL;

#endif
#if USE_CDC_IAD && USE_CDC_NUM >= 3
    /* CDC3 */
    /* Open EP IN */
    (void)USBD_LL_OpenEP(pdev, CDC_IN_EP3, USBD_EP_TYPE_BULK,
                         CDC_DATA_FS_IN_PACKET_SIZE);

    pdev->ep_in[CDC_IN_EP3 & 0xFU].is_used = 1U;

    /* Open EP OUT */
    (void)USBD_LL_OpenEP(pdev, CDC_OUT_EP3, USBD_EP_TYPE_BULK,
                         CDC_DATA_FS_OUT_PACKET_SIZE);

    pdev->ep_out[CDC_OUT_EP3 & 0xFU].is_used = 1U;

    /* Set bInterval for CDC CMD Endpoint */
    pdev->ep_in[CDC_CMD_EP6 & 0xFU].bInterval = CDC_FS_BINTERVAL;
#endif
  }

  /* Open Command IN EP */
  (void)USBD_LL_OpenEP(pdev, CDCCmdEpAdd, USBD_EP_TYPE_INTR, CDC_CMD_PACKET_SIZE);
  pdev->ep_in[CDCCmdEpAdd & 0xFU].is_used = 1U;

#if USE_CDC_IAD && USE_CDC_NUM >= 2
  (void)USBD_LL_OpenEP(pdev, CDC_CMD_EP5, USBD_EP_TYPE_INTR, CDC_CMD_PACKET_SIZE);
  pdev->ep_in[CDC_CMD_EP5 & 0xFU].is_used = 1U;
#endif
#if USE_CDC_IAD && USE_CDC_NUM >= 3
  (void)USBD_LL_OpenEP(pdev, CDC_CMD_EP6, USBD_EP_TYPE_INTR, CDC_CMD_PACKET_SIZE);
  pdev->ep_in[CDC_CMD_EP6 & 0xFU].is_used = 1U;
#endif

  hcdc->RxBuffer = NULL;

  /* Init  physical Interface components */
  ((USBD_CDC_ItfTypeDef *)pdev->pUserData[pdev->classId])->Init();

  /* Init Xfer states */
  hcdc->TxState = 0U;
  hcdc->RxState = 0U;

  if (hcdc->RxBuffer == NULL)
  {
    return (uint8_t)USBD_EMEM;
  }

  if (pdev->dev_speed == USBD_SPEED_HIGH)
  {
    /* Prepare Out endpoint to receive next packet */
    (void)USBD_LL_PrepareReceive(pdev, CDCOutEpAdd, hcdc->RxBuffer,
                                 CDC_DATA_HS_OUT_PACKET_SIZE);
#if USE_CDC_IAD && USE_CDC_NUM >= 2
    (void)USBD_LL_PrepareReceive(pdev, CDC_OUT_EP2, hcdc->RxBuffer,
                                 CDC_DATA_HS_OUT_PACKET_SIZE);
#endif
#if USE_CDC_IAD && USE_CDC_NUM >= 3
    (void)USBD_LL_PrepareReceive(pdev, CDC_OUT_EP3, hcdc->RxBuffer,
                                 CDC_DATA_HS_OUT_PACKET_SIZE);
#endif
  }
  else
  {
    /* Prepare Out endpoint to receive next packet */
    (void)USBD_LL_PrepareReceive(pdev, CDCOutEpAdd, hcdc->RxBuffer,
                                 CDC_DATA_FS_OUT_PACKET_SIZE);
#if USE_CDC_IAD && USE_CDC_NUM >= 2
    (void)USBD_LL_PrepareReceive(pdev, CDC_OUT_EP2, hcdc->RxBuffer,
                                 CDC_DATA_FS_OUT_PACKET_SIZE);
#endif
#if USE_CDC_IAD && USE_CDC_NUM >= 3
    (void)USBD_LL_PrepareReceive(pdev, CDC_OUT_EP3, hcdc->RxBuffer,
                                 CDC_DATA_FS_OUT_PACKET_SIZE);
#endif
  }

  return (uint8_t)USBD_OK;
}

/**
  * @brief  USBD_CDC_Init
  *         DeInitialize the CDC layer
  * @param  pdev: device instance
  * @param  cfgidx: Configuration index
  * @retval status
  */
static uint8_t USBD_CDC_DeInit(USBD_HandleTypeDef *pdev, uint8_t cfgidx)
{
  UNUSED(cfgidx);


#ifdef USE_USBD_COMPOSITE
  /* Get the Endpoints addresses allocated for this CDC class instance */
  CDCInEpAdd  = USBD_CoreGetEPAdd(pdev, CDC_IN_EP, USBD_EP_TYPE_BULK);
  CDCOutEpAdd = USBD_CoreGetEPAdd(pdev, CDC_OUT_EP, USBD_EP_TYPE_BULK);
  CDCCmdEpAdd = USBD_CoreGetEPAdd(pdev, CDC_CMD_EP, USBD_EP_TYPE_INTR);
#endif /* USE_USBD_COMPOSITE */

  /* Close EP IN */
  (void)USBD_LL_CloseEP(pdev, CDCInEpAdd);
  pdev->ep_in[CDCInEpAdd & 0xFU].is_used = 0U;

  /* Close EP OUT */
  (void)USBD_LL_CloseEP(pdev, CDCOutEpAdd);
  pdev->ep_out[CDCOutEpAdd & 0xFU].is_used = 0U;

  /* Close Command IN EP */
  (void)USBD_LL_CloseEP(pdev, CDCCmdEpAdd);
  pdev->ep_in[CDCCmdEpAdd & 0xFU].is_used = 0U;
  pdev->ep_in[CDCCmdEpAdd & 0xFU].bInterval = 0U;

#if USE_CDC_IAD && USE_CDC_NUM >= 2
  /* Close EP2 IN */
  (void)USBD_LL_CloseEP(pdev, CDC_IN_EP2);
  pdev->ep_in[CDC_IN_EP2 & 0xFU].is_used = 0U;

  /* Close EP2 OUT */
  (void)USBD_LL_CloseEP(pdev, CDC_OUT_EP2);
  pdev->ep_out[CDC_OUT_EP2 & 0xFU].is_used = 0U;

  /* Close Command IN EP5 */
  (void)USBD_LL_CloseEP(pdev, CDC_CMD_EP5);
  pdev->ep_in[CDC_CMD_EP5 & 0xFU].is_used = 0U;
  pdev->ep_in[CDC_CMD_EP5 & 0xFU].bInterval = 0U;
#endif

#if USE_CDC_IAD && USE_CDC_NUM >= 3
  /* Close EP3 IN */
  (void)USBD_LL_CloseEP(pdev, CDC_IN_EP3);
  pdev->ep_in[CDC_IN_EP3 & 0xFU].is_used = 0U;

  /* Close EP3 OUT */
  (void)USBD_LL_CloseEP(pdev, CDC_OUT_EP3);
  pdev->ep_out[CDC_OUT_EP3 & 0xFU].is_used = 0U;

  /* Close Command IN EP6 */
  (void)USBD_LL_CloseEP(pdev, CDC_CMD_EP6);
  pdev->ep_in[CDC_CMD_EP6 & 0xFU].is_used = 0U;
  pdev->ep_in[CDC_CMD_EP6 & 0xFU].bInterval = 0U;
#endif

  /* DeInit  physical Interface components */
  if (pdev->pClassDataCmsit[pdev->classId] != NULL)
  {
    ((USBD_CDC_ItfTypeDef *)pdev->pUserData[pdev->classId])->DeInit();
    (void)USBD_free(pdev->pClassDataCmsit[pdev->classId]);
    pdev->pClassDataCmsit[pdev->classId] = NULL;
    pdev->pClassData = NULL;
  }

  return (uint8_t)USBD_OK;
}

/**
  * @brief  USBD_CDC_Setup
  *         Handle the CDC specific requests
  * @param  pdev: instance
  * @param  req: usb requests
  * @retval status
  */
static uint8_t USBD_CDC_Setup(USBD_HandleTypeDef *pdev,
                              USBD_SetupReqTypedef *req)
{
  USBD_CDC_HandleTypeDef *hcdc = (USBD_CDC_HandleTypeDef *)pdev->pClassDataCmsit[pdev->classId];
  uint16_t len;
  uint8_t ifalt = 0U;
  uint16_t status_info = 0U;
  USBD_StatusTypeDef ret = USBD_OK;

  if (hcdc == NULL)
  {
    return (uint8_t)USBD_FAIL;
  }

  switch (req->bmRequest & USB_REQ_TYPE_MASK)
  {
    case USB_REQ_TYPE_CLASS:
      if (req->wLength != 0U)
      {
        if ((req->bmRequest & 0x80U) != 0U)
        {
          ((USBD_CDC_ItfTypeDef *)pdev->pUserData[pdev->classId])->Control(req->bRequest,
                                                                           (uint8_t *)hcdc->data,
                                                                           req->wLength);

          len = MIN(CDC_REQ_MAX_DATA_SIZE, req->wLength);
          (void)USBD_CtlSendData(pdev, (uint8_t *)hcdc->data, len);
        }
        else
        {
          hcdc->CmdOpCode = req->bRequest;
          hcdc->CmdLength = (uint8_t)MIN(req->wLength, USB_MAX_EP0_SIZE);

          (void)USBD_CtlPrepareRx(pdev, (uint8_t *)hcdc->data, hcdc->CmdLength);
        }
      }
      else
      {
        ((USBD_CDC_ItfTypeDef *)pdev->pUserData[pdev->classId])->Control(req->bRequest,
                                                                         (uint8_t *)req, 0U);
      }
      break;

    case USB_REQ_TYPE_STANDARD:
      switch (req->bRequest)
      {
        case USB_REQ_GET_STATUS:
          if (pdev->dev_state == USBD_STATE_CONFIGURED)
          {
            (void)USBD_CtlSendData(pdev, (uint8_t *)&status_info, 2U);
          }
          else
          {
            USBD_CtlError(pdev, req);
            ret = USBD_FAIL;
          }
          break;

        case USB_REQ_GET_INTERFACE:
          if (pdev->dev_state == USBD_STATE_CONFIGURED)
          {
            (void)USBD_CtlSendData(pdev, &ifalt, 1U);
          }
          else
          {
            USBD_CtlError(pdev, req);
            ret = USBD_FAIL;
          }
          break;

        case USB_REQ_SET_INTERFACE:
          if (pdev->dev_state != USBD_STATE_CONFIGURED)
          {
            USBD_CtlError(pdev, req);
            ret = USBD_FAIL;
          }
          break;

        case USB_REQ_CLEAR_FEATURE:
          break;

        default:
          USBD_CtlError(pdev, req);
          ret = USBD_FAIL;
          break;
      }
      break;

    default:
      USBD_CtlError(pdev, req);
      ret = USBD_FAIL;
      break;
  }

  return (uint8_t)ret;
}

/**
  * @brief  USBD_CDC_DataIn
  *         Data sent on non-control IN endpoint
  * @param  pdev: device instance
  * @param  epnum: endpoint number
  * @retval status
  */
static uint8_t USBD_CDC_DataIn(USBD_HandleTypeDef *pdev, uint8_t epnum)
{
  USBD_CDC_HandleTypeDef *hcdc;
  PCD_HandleTypeDef *hpcd = (PCD_HandleTypeDef *)pdev->pData;

  if (pdev->pClassDataCmsit[pdev->classId] == NULL)
  {
    return (uint8_t)USBD_FAIL;
  }

  hcdc = (USBD_CDC_HandleTypeDef *)pdev->pClassDataCmsit[pdev->classId];

  if ((pdev->ep_in[epnum & 0xFU].total_length > 0U) &&
      ((pdev->ep_in[epnum & 0xFU].total_length % hpcd->IN_ep[epnum & 0xFU].maxpacket) == 0U))
  {
    /* Update the packet total length */
    pdev->ep_in[epnum & 0xFU].total_length = 0U;

    /* Send ZLP */
    (void)USBD_LL_Transmit(pdev, epnum, NULL, 0U);
  }
  else
  {
    hcdc->TxState = 0U;

    if (((USBD_CDC_ItfTypeDef *)pdev->pUserData[pdev->classId])->TransmitCplt != NULL)
    {
      ((USBD_CDC_ItfTypeDef *)pdev->pUserData[pdev->classId])->TransmitCplt(hcdc->TxBuffer, &hcdc->TxLength, epnum);
    }
  }

  return (uint8_t)USBD_OK;
}

/**
  * @brief  USBD_CDC_DataOut
  *         Data received on non-control Out endpoint
  * @param  pdev: device instance
  * @param  epnum: endpoint number
  * @retval status
  */
static uint8_t USBD_CDC_DataOut(USBD_HandleTypeDef *pdev, uint8_t epnum)
{
  USBD_CDC_HandleTypeDef *hcdc = (USBD_CDC_HandleTypeDef *)pdev->pClassDataCmsit[pdev->classId];

  if (pdev->pClassDataCmsit[pdev->classId] == NULL)
  {
    return (uint8_t)USBD_FAIL;
  }

  /* Get the received data length */
  hcdc->RxLength = USBD_LL_GetRxDataSize(pdev, epnum);

  /* USB data will be immediately processed, this allow next USB traffic being
  NAKed till the end of the application Xfer */

  ((USBD_CDC_ItfTypeDef *)pdev->pUserData[pdev->classId])->Receive(hcdc->RxBuffer, &hcdc->RxLength, epnum);

  return (uint8_t)USBD_OK;
}

/**
  * @brief  USBD_CDC_EP0_RxReady
  *         Handle EP0 Rx Ready event
  * @param  pdev: device instance
  * @retval status
  */
static uint8_t USBD_CDC_EP0_RxReady(USBD_HandleTypeDef *pdev)
{
  USBD_CDC_HandleTypeDef *hcdc = (USBD_CDC_HandleTypeDef *)pdev->pClassDataCmsit[pdev->classId];

  if (hcdc == NULL)
  {
    return (uint8_t)USBD_FAIL;
  }

  if ((pdev->pUserData[pdev->classId] != NULL) && (hcdc->CmdOpCode != 0xFFU))
  {
    ((USBD_CDC_ItfTypeDef *)pdev->pUserData[pdev->classId])->Control(hcdc->CmdOpCode,
                                                                     (uint8_t *)hcdc->data,
                                                                     (uint16_t)hcdc->CmdLength);
    hcdc->CmdOpCode = 0xFFU;
  }

  return (uint8_t)USBD_OK;
}
#ifndef USE_USBD_COMPOSITE
/**
  * @brief  USBD_CDC_GetFSCfgDesc
  *         Return configuration descriptor
  * @param  length : pointer data length
  * @retval pointer to descriptor buffer
  */
static uint8_t *USBD_CDC_GetFSCfgDesc(uint16_t *length)
{
  USBD_EpDescTypeDef *pEpCmdDesc = USBD_GetEpDesc(USBD_CDC_CfgDesc, CDC_CMD_EP);
  USBD_EpDescTypeDef *pEpOutDesc = USBD_GetEpDesc(USBD_CDC_CfgDesc, CDC_OUT_EP);
  USBD_EpDescTypeDef *pEpInDesc = USBD_GetEpDesc(USBD_CDC_CfgDesc, CDC_IN_EP);

  if (pEpCmdDesc != NULL)
  {
    pEpCmdDesc->bInterval = CDC_FS_BINTERVAL;
  }

  if (pEpOutDesc != NULL)
  {
    pEpOutDesc->wMaxPacketSize = CDC_DATA_FS_MAX_PACKET_SIZE;
  }

  if (pEpInDesc != NULL)
  {
    pEpInDesc->wMaxPacketSize = CDC_DATA_FS_MAX_PACKET_SIZE;
  }

  *length = (uint16_t)sizeof(USBD_CDC_CfgDesc);
  return USBD_CDC_CfgDesc;
}

/**
  * @brief  USBD_CDC_GetHSCfgDesc
  *         Return configuration descriptor
  * @param  length : pointer data length
  * @retval pointer to descriptor buffer
  */
static uint8_t *USBD_CDC_GetHSCfgDesc(uint16_t *length)
{
  USBD_EpDescTypeDef *pEpCmdDesc = USBD_GetEpDesc(USBD_CDC_CfgDesc, CDC_CMD_EP);
  USBD_EpDescTypeDef *pEpOutDesc = USBD_GetEpDesc(USBD_CDC_CfgDesc, CDC_OUT_EP);
  USBD_EpDescTypeDef *pEpInDesc = USBD_GetEpDesc(USBD_CDC_CfgDesc, CDC_IN_EP);

  if (pEpCmdDesc != NULL)
  {
    pEpCmdDesc->bInterval = CDC_HS_BINTERVAL;
  }

  if (pEpOutDesc != NULL)
  {
    pEpOutDesc->wMaxPacketSize = CDC_DATA_HS_MAX_PACKET_SIZE;
  }

  if (pEpInDesc != NULL)
  {
    pEpInDesc->wMaxPacketSize = CDC_DATA_HS_MAX_PACKET_SIZE;
  }

  *length = (uint16_t)sizeof(USBD_CDC_CfgDesc);
  return USBD_CDC_CfgDesc;
}

/**
  * @brief  USBD_CDC_GetOtherSpeedCfgDesc
  *         Return configuration descriptor
  * @param  length : pointer data length
  * @retval pointer to descriptor buffer
  */
static uint8_t *USBD_CDC_GetOtherSpeedCfgDesc(uint16_t *length)
{
  USBD_EpDescTypeDef *pEpCmdDesc = USBD_GetEpDesc(USBD_CDC_CfgDesc, CDC_CMD_EP);
  USBD_EpDescTypeDef *pEpOutDesc = USBD_GetEpDesc(USBD_CDC_CfgDesc, CDC_OUT_EP);
  USBD_EpDescTypeDef *pEpInDesc = USBD_GetEpDesc(USBD_CDC_CfgDesc, CDC_IN_EP);

  if (pEpCmdDesc != NULL)
  {
    pEpCmdDesc->bInterval = CDC_FS_BINTERVAL;
  }

  if (pEpOutDesc != NULL)
  {
    pEpOutDesc->wMaxPacketSize = CDC_DATA_FS_MAX_PACKET_SIZE;
  }

  if (pEpInDesc != NULL)
  {
    pEpInDesc->wMaxPacketSize = CDC_DATA_FS_MAX_PACKET_SIZE;
  }

  *length = (uint16_t)sizeof(USBD_CDC_CfgDesc);
  return USBD_CDC_CfgDesc;
}

/**
  * @brief  USBD_CDC_GetDeviceQualifierDescriptor
  *         return Device Qualifier descriptor
  * @param  length : pointer data length
  * @retval pointer to descriptor buffer
  */
uint8_t *USBD_CDC_GetDeviceQualifierDescriptor(uint16_t *length)
{
  *length = (uint16_t)sizeof(USBD_CDC_DeviceQualifierDesc);

  return USBD_CDC_DeviceQualifierDesc;
}
#endif /* USE_USBD_COMPOSITE  */
/**
  * @brief  USBD_CDC_RegisterInterface
  * @param  pdev: device instance
  * @param  fops: CD  Interface callback
  * @retval status
  */
uint8_t USBD_CDC_RegisterInterface(USBD_HandleTypeDef *pdev,
                                   USBD_CDC_ItfTypeDef *fops)
{
  if (fops == NULL)
  {
    return (uint8_t)USBD_FAIL;
  }

  pdev->pUserData[pdev->classId] = fops;

  return (uint8_t)USBD_OK;
}

/**
  * @brief  USBD_CDC_SetTxBuffer
  * @param  pdev: device instance
  * @param  pbuff: Tx Buffer
  * @param  length: Tx Buffer length
  * @retval status
  */
uint8_t USBD_CDC_SetTxBuffer(USBD_HandleTypeDef *pdev,
                             uint8_t *pbuff, uint32_t length)
{
  USBD_CDC_HandleTypeDef *hcdc = (USBD_CDC_HandleTypeDef *)pdev->pClassDataCmsit[pdev->classId];

  if (hcdc == NULL)
  {
    return (uint8_t)USBD_FAIL;
  }

  hcdc->TxBuffer = pbuff;
  hcdc->TxLength = length;

  return (uint8_t)USBD_OK;
}

/**
  * @brief  USBD_CDC_SetRxBuffer
  * @param  pdev: device instance
  * @param  pbuff: Rx Buffer
  * @retval status
  */
uint8_t USBD_CDC_SetRxBuffer(USBD_HandleTypeDef *pdev, uint8_t *pbuff)
{
  USBD_CDC_HandleTypeDef *hcdc = (USBD_CDC_HandleTypeDef *)pdev->pClassDataCmsit[pdev->classId];

  if (hcdc == NULL)
  {
    return (uint8_t)USBD_FAIL;
  }

  hcdc->RxBuffer = pbuff;

  return (uint8_t)USBD_OK;
}

/**
  * @brief  USBD_CDC_TransmitPacket
  *         Transmit packet on IN endpoint
  * @param  pdev: device instance
  * @param  epnum: 输入端点地址
  * @retval status
  */
uint8_t USBD_CDC_TransmitPacket(USBD_HandleTypeDef *pdev, uint8_t epnum)
{
  USBD_CDC_HandleTypeDef *hcdc = (USBD_CDC_HandleTypeDef *)pdev->pClassDataCmsit[pdev->classId];
  USBD_StatusTypeDef ret = USBD_BUSY;

#ifdef USE_USBD_COMPOSITE
  /* Get the Endpoints addresses allocated for this class instance */
  CDCInEpAdd  = USBD_CoreGetEPAdd(pdev, USBD_EP_IN, USBD_EP_TYPE_BULK);
#endif /* USE_USBD_COMPOSITE */
  if (pdev->pClassDataCmsit[pdev->classId] == NULL)
  {
    return (uint8_t)USBD_FAIL;
  }

  if (hcdc->TxState == 0U)
  {
    /* Tx Transfer in progress */
    hcdc->TxState = 1U;

    /* Update the packet total length */
    pdev->ep_in[epnum & 0xFU].total_length = hcdc->TxLength;

    /* Transmit next packet */
    (void)USBD_LL_Transmit(pdev, epnum, hcdc->TxBuffer, hcdc->TxLength);

    ret = USBD_OK;
  }

  return (uint8_t)ret;
}

/**
  * @brief  USBD_CDC_ReceivePacket
  *         prepare OUT Endpoint for reception
  * @param  pdev: device instance
  * @param  epnum: 输出端点地址
  * @retval status
  */
uint8_t USBD_CDC_ReceivePacket(USBD_HandleTypeDef *pdev, uint8_t epnum)
{
  USBD_CDC_HandleTypeDef *hcdc = (USBD_CDC_HandleTypeDef *)pdev->pClassDataCmsit[pdev->classId];

#ifdef USE_USBD_COMPOSITE
  /* Get the Endpoints addresses allocated for this class instance */
  CDCOutEpAdd = USBD_CoreGetEPAdd(pdev, USBD_EP_OUT, USBD_EP_TYPE_BULK);
#endif /* USE_USBD_COMPOSITE */

  if (pdev->pClassDataCmsit[pdev->classId] == NULL)
  {
    return (uint8_t)USBD_FAIL;
  }

  if (pdev->dev_speed == USBD_SPEED_HIGH)
  {
    /* Prepare Out endpoint to receive next packet */
    (void)USBD_LL_PrepareReceive(pdev, epnum, hcdc->RxBuffer,
                                 CDC_DATA_HS_OUT_PACKET_SIZE);
  }
  else
  {
    /* Prepare Out endpoint to receive next packet */
    (void)USBD_LL_PrepareReceive(pdev, epnum, hcdc->RxBuffer,
                                 CDC_DATA_FS_OUT_PACKET_SIZE);
  }

  return (uint8_t)USBD_OK;
}
/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */



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    接口修改

    usbd_cdc_if.c

    /* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : usbd_cdc_if.c
  * @version        : v1.0_Cube
  * @brief          : Usb device for Virtual Com Port.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2022 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */
/* USER CODE END Header */

/* Includes ------------------------------------------------------------------*/
#include "usbd_cdc_if.h"

/* USER CODE BEGIN INCLUDE */

/* USER CODE END INCLUDE */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/

/* USER CODE BEGIN PV */
/* Private variables ---------------------------------------------------------*/

/* USER CODE END PV */

/** @addtogroup STM32_USB_OTG_DEVICE_LIBRARY
  * @brief Usb device library.
  * @{
  */

/** @addtogroup USBD_CDC_IF
  * @{
  */

/** @defgroup USBD_CDC_IF_Private_TypesDefinitions USBD_CDC_IF_Private_TypesDefinitions
  * @brief Private types.
  * @{
  */

/* USER CODE BEGIN PRIVATE_TYPES */

/* USER CODE END PRIVATE_TYPES */

/**
  * @}
  */

/** @defgroup USBD_CDC_IF_Private_Defines USBD_CDC_IF_Private_Defines
  * @brief Private defines.
  * @{
  */

/* USER CODE BEGIN PRIVATE_DEFINES */
/* USER CODE END PRIVATE_DEFINES */

/**
  * @}
  */

/** @defgroup USBD_CDC_IF_Private_Macros USBD_CDC_IF_Private_Macros
  * @brief Private macros.
  * @{
  */

/* USER CODE BEGIN PRIVATE_MACRO */

/* USER CODE END PRIVATE_MACRO */

/**
  * @}
  */

/** @defgroup USBD_CDC_IF_Private_Variables USBD_CDC_IF_Private_Variables
  * @brief Private variables.
  * @{
  */
/* Create buffer for reception and transmission           */
/* It's up to user to redefine and/or remove those define */
/** Received data over USB are stored in this buffer      */
uint8_t UserRxBufferFS[APP_RX_DATA_SIZE];

/** Data to send over USB CDC are stored in this buffer   */
uint8_t UserTxBufferFS[APP_TX_DATA_SIZE];

/* USER CODE BEGIN PRIVATE_VARIABLES */

/* USER CODE END PRIVATE_VARIABLES */

/**
  * @}
  */

/** @defgroup USBD_CDC_IF_Exported_Variables USBD_CDC_IF_Exported_Variables
  * @brief Public variables.
  * @{
  */

extern USBD_HandleTypeDef hUsbDeviceFS;

/* USER CODE BEGIN EXPORTED_VARIABLES */

/* USER CODE END EXPORTED_VARIABLES */

/**
  * @}
  */

/** @defgroup USBD_CDC_IF_Private_FunctionPrototypes USBD_CDC_IF_Private_FunctionPrototypes
  * @brief Private functions declaration.
  * @{
  */

static int8_t CDC_Init_FS(void);
static int8_t CDC_DeInit_FS(void);
static int8_t CDC_Control_FS(uint8_t cmd, uint8_t* pbuf, uint16_t length);
static int8_t CDC_Receive_FS(uint8_t* pbuf, uint32_t *Len, uint8_t epnum);
static int8_t CDC_TransmitCplt_FS(uint8_t *pbuf, uint32_t *Len, uint8_t epnum);

/* USER CODE BEGIN PRIVATE_FUNCTIONS_DECLARATION */

/* USER CODE END PRIVATE_FUNCTIONS_DECLARATION */

/**
  * @}
  */

USBD_CDC_ItfTypeDef USBD_Interface_fops_FS =
{
  CDC_Init_FS,
  CDC_DeInit_FS,
  CDC_Control_FS,
  CDC_Receive_FS,
  CDC_TransmitCplt_FS
};

/* Private functions ---------------------------------------------------------*/
/**
  * @brief  Initializes the CDC media low layer over the FS USB IP
  * @retval USBD_OK if all operations are OK else USBD_FAIL
  */
static int8_t CDC_Init_FS(void)
{
  /* USER CODE BEGIN 3 */
  /* Set Application Buffers */
  USBD_CDC_SetTxBuffer(&hUsbDeviceFS, UserTxBufferFS, 0);
  USBD_CDC_SetRxBuffer(&hUsbDeviceFS, UserRxBufferFS);
  return (USBD_OK);
  /* USER CODE END 3 */
}

/**
  * @brief  DeInitializes the CDC media low layer
  * @retval USBD_OK if all operations are OK else USBD_FAIL
  */
static int8_t CDC_DeInit_FS(void)
{
  /* USER CODE BEGIN 4 */
  return (USBD_OK);
  /* USER CODE END 4 */
}

/**
  * @brief  Manage the CDC class requests
  * @param  cmd: Command code
  * @param  pbuf: Buffer containing command data (request parameters)
  * @param  length: Number of data to be sent (in bytes)
  * @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
  */
static int8_t CDC_Control_FS(uint8_t cmd, uint8_t* pbuf, uint16_t length)
{
  /* USER CODE BEGIN 5 */
  switch(cmd)
  {
    case CDC_SEND_ENCAPSULATED_COMMAND:

    break;

    case CDC_GET_ENCAPSULATED_RESPONSE:

    break;

    case CDC_SET_COMM_FEATURE:

    break;

    case CDC_GET_COMM_FEATURE:

    break;

    case CDC_CLEAR_COMM_FEATURE:

    break;

  /*******************************************************************************/
  /* Line Coding Structure                                                       */
  /*-----------------------------------------------------------------------------*/
  /* Offset | Field       | Size | Value  | Description                          */
  /* 0      | dwDTERate   |   4  | Number |Data terminal rate, in bits per second*/
  /* 4      | bCharFormat |   1  | Number | Stop bits                            */
  /*                                        0 - 1 Stop bit                       */
  /*                                        1 - 1.5 Stop bits                    */
  /*                                        2 - 2 Stop bits                      */
  /* 5      | bParityType |  1   | Number | Parity                               */
  /*                                        0 - None                             */
  /*                                        1 - Odd                              */
  /*                                        2 - Even                             */
  /*                                        3 - Mark                             */
  /*                                        4 - Space                            */
  /* 6      | bDataBits  |   1   | Number Data bits (5, 6, 7, 8 or 16).          */
  /*******************************************************************************/
    case CDC_SET_LINE_CODING:

    break;

    case CDC_GET_LINE_CODING:

    break;

    case CDC_SET_CONTROL_LINE_STATE:

    break;

    case CDC_SEND_BREAK:

    break;

  default:
    break;
  }

  return (USBD_OK);
  /* USER CODE END 5 */
}

/**
  * @brief  Data received over USB OUT endpoint are sent over CDC interface
  *         through this function.
  *
  *         @note
  *         This function will issue a NAK packet on any OUT packet received on
  *         USB endpoint until exiting this function. If you exit this function
  *         before transfer is complete on CDC interface (ie. using DMA controller)
  *         it will result in receiving more data while previous ones are still
  *         not sent.
  *
  * @param  Buf: Buffer of data to be received
  * @param  Len: Number of data received (in bytes)
  * @param  epnum: 输出端点地址
  * @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
  */
static int8_t CDC_Receive_FS(uint8_t* Buf, uint32_t *Len, uint8_t epnum)
{
  /* USER CODE BEGIN 6 */
  USBD_CDC_SetRxBuffer(&hUsbDeviceFS, &Buf[0]);
  USBD_CDC_ReceivePacket(&hUsbDeviceFS, epnum);
  CDC_Transmit_FS(Buf, *Len, epnum);
  return (USBD_OK);
  /* USER CODE END 6 */
}

/**
  * @brief  CDC_Transmit_FS
  *         Data to send over USB IN endpoint are sent over CDC interface
  *         through this function.
  *         @note
  *
  *
  * @param  Buf: Buffer of data to be sent
  * @param  Len: Number of data to be sent (in bytes)
  * @param  epnum: 输入端点地址
  * @retval USBD_OK if all operations are OK else USBD_FAIL or USBD_BUSY
  */
uint8_t CDC_Transmit_FS(uint8_t* Buf, uint16_t Len, uint8_t epnum)
{
  uint8_t result = USBD_OK;
  /* USER CODE BEGIN 7 */
  USBD_CDC_HandleTypeDef *hcdc = (USBD_CDC_HandleTypeDef*)hUsbDeviceFS.pClassData;
  if (hcdc->TxState != 0){
    return USBD_BUSY;
  }
  USBD_CDC_SetTxBuffer(&hUsbDeviceFS, Buf, Len);
  result = USBD_CDC_TransmitPacket(&hUsbDeviceFS, epnum);
  /* USER CODE END 7 */
  return result;
}

/**
  * @brief  CDC_TransmitCplt_FS
  *         Data transmitted callback
  *
  *         @note
  *         This function is IN transfer complete callback used to inform user that
  *         the submitted Data is successfully sent over USB.
  *
  * @param  Buf: Buffer of data to be received
  * @param  Len: Number of data received (in bytes)
  * @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
  */
static int8_t CDC_TransmitCplt_FS(uint8_t *Buf, uint32_t *Len, uint8_t epnum)
{
  uint8_t result = USBD_OK;
  /* USER CODE BEGIN 13 */
  UNUSED(Buf);
  UNUSED(Len);
  UNUSED(epnum);
  /* USER CODE END 13 */
  return result;
}

/* USER CODE BEGIN PRIVATE_FUNCTIONS_IMPLEMENTATION */

/* USER CODE END PRIVATE_FUNCTIONS_IMPLEMENTATION */

/**
  * @}
  */

/**
  * @}
  */


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    usbd_cdc_if.h

    /* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : usbd_cdc_if.h
  * @version        : v1.0_Cube
  * @brief          : Header for usbd_cdc_if.c file.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2022 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */
/* USER CODE END Header */

/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef __USBD_CDC_IF_H__
#define __USBD_CDC_IF_H__

#ifdef __cplusplus
 extern "C" {
#endif

/* Includes ------------------------------------------------------------------*/
#include "usbd_cdc.h"

/* USER CODE BEGIN INCLUDE */

/* USER CODE END INCLUDE */

/** @addtogroup STM32_USB_OTG_DEVICE_LIBRARY
  * @brief For Usb device.
  * @{
  */

/** @defgroup USBD_CDC_IF USBD_CDC_IF
  * @brief Usb VCP device module
  * @{
  */

/** @defgroup USBD_CDC_IF_Exported_Defines USBD_CDC_IF_Exported_Defines
  * @brief Defines.
  * @{
  */
/* Define size for the receive and transmit buffer over CDC */
#define APP_RX_DATA_SIZE  512
#define APP_TX_DATA_SIZE  512
/* USER CODE BEGIN EXPORTED_DEFINES */

/* USER CODE END EXPORTED_DEFINES */

/**
  * @}
  */

/** @defgroup USBD_CDC_IF_Exported_Types USBD_CDC_IF_Exported_Types
  * @brief Types.
  * @{
  */

/* USER CODE BEGIN EXPORTED_TYPES */

/* USER CODE END EXPORTED_TYPES */

/**
  * @}
  */

/** @defgroup USBD_CDC_IF_Exported_Macros USBD_CDC_IF_Exported_Macros
  * @brief Aliases.
  * @{
  */

/* USER CODE BEGIN EXPORTED_MACRO */

/* USER CODE END EXPORTED_MACRO */

/**
  * @}
  */

/** @defgroup USBD_CDC_IF_Exported_Variables USBD_CDC_IF_Exported_Variables
  * @brief Public variables.
  * @{
  */

/** CDC Interface callback. */
extern USBD_CDC_ItfTypeDef USBD_Interface_fops_FS;

/* USER CODE BEGIN EXPORTED_VARIABLES */

/* USER CODE END EXPORTED_VARIABLES */

/**
  * @}
  */

/** @defgroup USBD_CDC_IF_Exported_FunctionsPrototype USBD_CDC_IF_Exported_FunctionsPrototype
  * @brief Public functions declaration.
  * @{
  */

uint8_t CDC_Transmit_FS(uint8_t* Buf, uint16_t Len, uint8_t epnum);

/* USER CODE BEGIN EXPORTED_FUNCTIONS */

/* USER CODE END EXPORTED_FUNCTIONS */

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

#ifdef __cplusplus
}
#endif

#endif /* __USBD_CDC_IF_H__ */


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    FIFO配置

    usbd_conf.c

      /* EP_OUT: 0x00(64) 0x01(64) 0x02(64) 0x03(64) 0x04(NULL fill 64) 0x05(NULL fill 64) 0x06(NULL fill 64) 最小64Bytes，HAL_PCDEx_SetRxFiFo每个数值代表4Bytes */
  HAL_PCDEx_SetRxFiFo(&hpcd_USB_OTG_FS, 16 + 16 * 6);

  /* EP_IN: 0x80(64) 0x81(64) 0x82(64) 0x83(64) 0x84(8) 0x85(8) 0x86(8) */
  HAL_PCDEx_SetTxFiFo(&hpcd_USB_OTG_FS, 0, 16);
  HAL_PCDEx_SetTxFiFo(&hpcd_USB_OTG_FS, 1, 16);
  HAL_PCDEx_SetTxFiFo(&hpcd_USB_OTG_FS, 2, 16);
  HAL_PCDEx_SetTxFiFo(&hpcd_USB_OTG_FS, 3, 16);
  HAL_PCDEx_SetTxFiFo(&hpcd_USB_OTG_FS, 4, 16);
  HAL_PCDEx_SetTxFiFo(&hpcd_USB_OTG_FS, 5, 16);
  HAL_PCDEx_SetTxFiFo(&hpcd_USB_OTG_FS, 6, 16);

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    知识点

    FIFO分配

    TXn最小大小= 16个字。

TXn min size = 16 words.

(n:发送FIFO索引)

(n : Transmit FIFO index)

当不使用TxFIFO时，配置如下:

When a TxFIFO is not used, the Configuration should be as follows:

情况1:n > m and Txn未被使用(n,m: Transmit FIFO indexes)

case 1 : n > m and Txn is not used (n,m : Transmit FIFO indexes)

——> Txm可以使用分配给Txn的空间。

--> Txm can use the space allocated for Txn.

case2: n < m, Txn未被使用(n,m:发送FIFO索引)

case2 : n < m and Txn is not used (n,m : Transmit FIFO indexes)

——> Txn应配置为16个word的最小空间，即64Bytes

--> Txn should be configured with the minimum space of 16 words

当使用txfifo在顶部分配时，FIFO被最优地使用

The FIFO is used optimally when used TxFIFOs are allocated in the top

FIFO。

of the FIFO.

例如:使用“EP1”和“EP2”作为IN，不使用“EP1”和“EP3”作为IN。

Ex: use EP1 and EP2 as IN instead of EP1 and EP3 as IN ones.

当使用DMA时，3n * FIFO位置应该为内部DMA寄存器保留

When DMA is used 3n * FIFO locations should be reserved for internal DMA registers

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    上面的意思是：在我们使用的端点地址中，存在某些未被使用的端点地址，分为两种情况：
    比如多路CDC中，我们使用了 （有数字的代表该端点地址数据包大小，NULL代表未使用，NULL fill代表未使用但需要填充）：
    EP_OUT: 0x00(64) 0x01(64) 0x02(64) 0x03(64) 0x04(NULL) 0x05(NULL) 0x06(NULL)
    EP_IN: 0x80(64) 0x81(64) 0x82(64) 0x83(64) 0x84(8) 0x85(8) 0x86(8)
    4、5、6三个EP_IN未使用，它属于：
    情况1:n > m and Txn未被使用(n,m: Transmit FIFO indexes)
    —> Txm可以使用分配给Txn的空间
    如果我们不用1、2、3，而使用4、5、6，则我们需要预留最小的空间给1 、2 、3

    不同芯片，对应USB FIFO空间大小不同需要对照手册

    HAL_PCDEx_SetRxFiFo需要先设置，接收缓冲区共用一块大小，函数接口大小设置单位是：word，即设置1代表4个字节大小

    在这里插入图片描述

    注意事项

    CDC配置的包大小，需要根据实际数据通讯场景，如果设的每包大小，小于实际每次传输的包那就会丢包，如果设大，不能超过FIFO的总大小！

    参考引用：http://t.csdn.cn/Gvr4P

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  • 原文地址：https://blog.csdn.net/weixin_42892101/article/details/126762618