/**
  ******************************************************************************
  * @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
  *
  *  @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
  *
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2015 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under Ultimate Liberty license
  * SLA0044, the "License"; You may not use this file except in compliance with
  * the License. You may obtain a copy of the License at:
  *                      www.st.com/SLA0044
  *
  ******************************************************************************
  */

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

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

#define _CDC_IN_EP 0x81U  /* EP1 for data IN */
#define _CDC_OUT_EP 0x01U /* EP1 for data OUT */
#define _CDC_CMD_EP 0x82U /* EP2 for CDC commands */

#define _CDC_CMD_ITF_NBR 0x00U /* Command Interface Number */
#define _CDC_COM_ITF_NBR 0x01U /* Communication Interface Number */

#define _CDC_STR_DESC_IDX 0x00

uint8_t CDC_IN_EP[NUMBER_OF_CDC];
uint8_t CDC_OUT_EP[NUMBER_OF_CDC];
uint8_t CDC_CMD_EP[NUMBER_OF_CDC];

uint8_t CDC_CMD_ITF_NBR[NUMBER_OF_CDC];
uint8_t CDC_COM_ITF_NBR[NUMBER_OF_CDC];

uint8_t CDC_STR_DESC_IDX[NUMBER_OF_CDC];

/** @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);

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);
static uint8_t *USBD_CDC_GetDeviceQualifierDescriptor(uint16_t *length);

USBD_CDC_ACM_HandleTypeDef CDC_ACM_Class_Data[NUMBER_OF_CDC];

/* 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,
};

/**
  * @}
  */

/** @defgroup USBD_CDC_Private_Variables
  * @{
  */

/* CDC interface class callbacks structure */
USBD_ClassTypeDef USBD_CDC_ACM =
    {
        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,
        USBD_CDC_GetHSCfgDesc,
        USBD_CDC_GetFSCfgDesc,
        USBD_CDC_GetOtherSpeedCfgDesc,
        USBD_CDC_GetDeviceQualifierDescriptor,
};

/* USB CDC device Configuration Descriptor */
__ALIGN_BEGIN static uint8_t USBD_CDC_CfgHSDesc[USB_CDC_CONFIG_DESC_SIZ] __ALIGN_END =
    {
        /* Configuration Descriptor */
        0x09,                            /* bLength: Configuration Descriptor size */
        USB_DESC_TYPE_CONFIGURATION,     /* bDescriptorType: Configuration */
        LOBYTE(USB_CDC_CONFIG_DESC_SIZ), /* wTotalLength:no of returned bytes */
        HIBYTE(USB_CDC_CONFIG_DESC_SIZ),
        (2 * NUMBER_OF_CDC), /* bNumInterfaces: 2 interface */
        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_MAX_POWER, /* MaxPower 100 mA */

        /********************  CDC0 block ********************/
        /******** IAD to associate the two CDC interfaces */
        0x08,             /* bLength */
        0x0B,             /* bDescriptorType */
        _CDC_CMD_ITF_NBR, /* bFirstInterface */
        0x02,             /* bInterfaceCount */
        0x02,             /* bFunctionClass */
        0x02,             /* bFunctionSubClass */
        0x01,             /* bFunctionProtocol */
        0x00,             /* iFunction (Index of string descriptor describing this function) */

        /* Interface Descriptor */
        0x09,                    /* bLength: Interface Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: Interface */
        _CDC_CMD_ITF_NBR,        /* bInterfaceNumber: Number of Interface */
        0x00,                    /* bAlternateSetting: Alternate setting */
        0x01,                    /* bNumEndpoints: One endpoints used */
        0x02,                    /* bInterfaceClass: Communication Interface Class */
        0x02,                    /* bInterfaceSubClass: Abstract Control Model */
        0x01,                    /* bInterfaceProtocol: Common AT commands */
        _CDC_STR_DESC_IDX,       /* 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 */
        _CDC_COM_ITF_NBR, /* bDataInterface: 1 */

        /* 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 */
        _CDC_CMD_ITF_NBR, /* bMasterInterface: Communication class interface */
        _CDC_COM_ITF_NBR, /* 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_HS_BINTERVAL, /* bInterval: */
        /*---------------------------------------------------------------------------*/

        /* Data class interface descriptor */
        0x09,                    /* bLength: Endpoint Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: */
        _CDC_COM_ITF_NBR,        /* 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_HS_MAX_PACKET_SIZE), /* wMaxPacketSize: */
        HIBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),
        0x00, /* bInterval: ignore for Bulk transfer */

        /* Endpoint IN Descriptor */
        0x07,                                /* bLength: Endpoint Descriptor size */
        USB_DESC_TYPE_ENDPOINT,              /* bDescriptorType: Endpoint */
        _CDC_IN_EP,                          /* bEndpointAddress */
        0x02,                                /* bmAttributes: Bulk */
        LOBYTE(CDC_DATA_HS_MAX_PACKET_SIZE), /* wMaxPacketSize: */
        HIBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),
        0x00, /* bInterval: ignore for Bulk transfer */

#if (NUMBER_OF_CDC > 1)
        /********************  CDC1 block ********************/
        /******** IAD to associate the two CDC interfaces */
        0x08,             /* bLength */
        0x0B,             /* bDescriptorType */
        _CDC_CMD_ITF_NBR, /* bFirstInterface */
        0x02,             /* bInterfaceCount */
        0x02,             /* bFunctionClass */
        0x02,             /* bFunctionSubClass */
        0x01,             /* bFunctionProtocol */
        0x00,             /* iFunction (Index of string descriptor describing this function) */

        /* Interface Descriptor */
        0x09,                    /* bLength: Interface Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: Interface */
        _CDC_CMD_ITF_NBR,        /* bInterfaceNumber: Number of Interface */
        0x00,                    /* bAlternateSetting: Alternate setting */
        0x01,                    /* bNumEndpoints: One endpoints used */
        0x02,                    /* bInterfaceClass: Communication Interface Class */
        0x02,                    /* bInterfaceSubClass: Abstract Control Model */
        0x01,                    /* bInterfaceProtocol: Common AT commands */
        _CDC_STR_DESC_IDX,       /* 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 */
        _CDC_COM_ITF_NBR, /* bDataInterface: 1 */

        /* 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 */
        _CDC_CMD_ITF_NBR, /* bMasterInterface: Communication class interface */
        _CDC_COM_ITF_NBR, /* 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_HS_BINTERVAL, /* bInterval: */
        /*---------------------------------------------------------------------------*/

        /* Data class interface descriptor */
        0x09,                    /* bLength: Endpoint Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: */
        _CDC_COM_ITF_NBR,        /* 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_HS_MAX_PACKET_SIZE), /* wMaxPacketSize: */
        HIBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),
        0x00, /* bInterval: ignore for Bulk transfer */

        /* Endpoint IN Descriptor */
        0x07,                                /* bLength: Endpoint Descriptor size */
        USB_DESC_TYPE_ENDPOINT,              /* bDescriptorType: Endpoint */
        _CDC_IN_EP,                          /* bEndpointAddress */
        0x02,                                /* bmAttributes: Bulk */
        LOBYTE(CDC_DATA_HS_MAX_PACKET_SIZE), /* wMaxPacketSize: */
        HIBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),
        0x00, /* bInterval: ignore for Bulk transfer */
#endif

#if (NUMBER_OF_CDC > 2)
        /********************  CDC2 block ********************/
        /******** IAD to associate the two CDC interfaces */
        0x08,             /* bLength */
        0x0B,             /* bDescriptorType */
        _CDC_CMD_ITF_NBR, /* bFirstInterface */
        0x02,             /* bInterfaceCount */
        0x02,             /* bFunctionClass */
        0x02,             /* bFunctionSubClass */
        0x01,             /* bFunctionProtocol */
        0x00,             /* iFunction (Index of string descriptor describing this function) */

        /* Interface Descriptor */
        0x09,                    /* bLength: Interface Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: Interface */
        _CDC_CMD_ITF_NBR,        /* bInterfaceNumber: Number of Interface */
        0x00,                    /* bAlternateSetting: Alternate setting */
        0x01,                    /* bNumEndpoints: One endpoints used */
        0x02,                    /* bInterfaceClass: Communication Interface Class */
        0x02,                    /* bInterfaceSubClass: Abstract Control Model */
        0x01,                    /* bInterfaceProtocol: Common AT commands */
        _CDC_STR_DESC_IDX,       /* 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 */
        _CDC_COM_ITF_NBR, /* bDataInterface: 1 */

        /* 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 */
        _CDC_CMD_ITF_NBR, /* bMasterInterface: Communication class interface */
        _CDC_COM_ITF_NBR, /* 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_HS_BINTERVAL, /* bInterval: */
        /*---------------------------------------------------------------------------*/

        /* Data class interface descriptor */
        0x09,                    /* bLength: Endpoint Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: */
        _CDC_COM_ITF_NBR,        /* 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_HS_MAX_PACKET_SIZE), /* wMaxPacketSize: */
        HIBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),
        0x00, /* bInterval: ignore for Bulk transfer */

        /* Endpoint IN Descriptor */
        0x07,                                /* bLength: Endpoint Descriptor size */
        USB_DESC_TYPE_ENDPOINT,              /* bDescriptorType: Endpoint */
        _CDC_IN_EP,                          /* bEndpointAddress */
        0x02,                                /* bmAttributes: Bulk */
        LOBYTE(CDC_DATA_HS_MAX_PACKET_SIZE), /* wMaxPacketSize: */
        HIBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),
        0x00, /* bInterval: ignore for Bulk transfer */
#endif

#if (NUMBER_OF_CDC > 3)
        /********************  CDC3 block ********************/
        /******** IAD to associate the two CDC interfaces */
        0x08,             /* bLength */
        0x0B,             /* bDescriptorType */
        _CDC_CMD_ITF_NBR, /* bFirstInterface */
        0x02,             /* bInterfaceCount */
        0x02,             /* bFunctionClass */
        0x02,             /* bFunctionSubClass */
        0x01,             /* bFunctionProtocol */
        0x00,             /* iFunction (Index of string descriptor describing this function) */

        /* Interface Descriptor */
        0x09,                    /* bLength: Interface Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: Interface */
        _CDC_CMD_ITF_NBR,        /* bInterfaceNumber: Number of Interface */
        0x00,                    /* bAlternateSetting: Alternate setting */
        0x01,                    /* bNumEndpoints: One endpoints used */
        0x02,                    /* bInterfaceClass: Communication Interface Class */
        0x02,                    /* bInterfaceSubClass: Abstract Control Model */
        0x01,                    /* bInterfaceProtocol: Common AT commands */
        _CDC_STR_DESC_IDX,       /* 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 */
        _CDC_COM_ITF_NBR, /* bDataInterface: 1 */

        /* 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 */
        _CDC_CMD_ITF_NBR, /* bMasterInterface: Communication class interface */
        _CDC_COM_ITF_NBR, /* 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_HS_BINTERVAL, /* bInterval: */
        /*---------------------------------------------------------------------------*/

        /* Data class interface descriptor */
        0x09,                    /* bLength: Endpoint Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: */
        _CDC_COM_ITF_NBR,        /* 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_HS_MAX_PACKET_SIZE), /* wMaxPacketSize: */
        HIBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),
        0x00, /* bInterval: ignore for Bulk transfer */

        /* Endpoint IN Descriptor */
        0x07,                                /* bLength: Endpoint Descriptor size */
        USB_DESC_TYPE_ENDPOINT,              /* bDescriptorType: Endpoint */
        _CDC_IN_EP,                          /* bEndpointAddress */
        0x02,                                /* bmAttributes: Bulk */
        LOBYTE(CDC_DATA_HS_MAX_PACKET_SIZE), /* wMaxPacketSize: */
        HIBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),
        0x00, /* bInterval: ignore for Bulk transfer */
#endif

#if (NUMBER_OF_CDC > 4)
        /********************  CDC4 block ********************/
        /******** IAD to associate the two CDC interfaces */
        0x08,             /* bLength */
        0x0B,             /* bDescriptorType */
        _CDC_CMD_ITF_NBR, /* bFirstInterface */
        0x02,             /* bInterfaceCount */
        0x02,             /* bFunctionClass */
        0x02,             /* bFunctionSubClass */
        0x01,             /* bFunctionProtocol */
        0x00,             /* iFunction (Index of string descriptor describing this function) */

        /* Interface Descriptor */
        0x09,                    /* bLength: Interface Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: Interface */
        _CDC_CMD_ITF_NBR,        /* bInterfaceNumber: Number of Interface */
        0x00,                    /* bAlternateSetting: Alternate setting */
        0x01,                    /* bNumEndpoints: One endpoints used */
        0x02,                    /* bInterfaceClass: Communication Interface Class */
        0x02,                    /* bInterfaceSubClass: Abstract Control Model */
        0x01,                    /* bInterfaceProtocol: Common AT commands */
        _CDC_STR_DESC_IDX,       /* 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 */
        _CDC_COM_ITF_NBR, /* bDataInterface: 1 */

        /* 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 */
        _CDC_CMD_ITF_NBR, /* bMasterInterface: Communication class interface */
        _CDC_COM_ITF_NBR, /* 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_HS_BINTERVAL, /* bInterval: */
        /*---------------------------------------------------------------------------*/

        /* Data class interface descriptor */
        0x09,                    /* bLength: Endpoint Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: */
        _CDC_COM_ITF_NBR,        /* 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_HS_MAX_PACKET_SIZE), /* wMaxPacketSize: */
        HIBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),
        0x00, /* bInterval: ignore for Bulk transfer */

        /* Endpoint IN Descriptor */
        0x07,                                /* bLength: Endpoint Descriptor size */
        USB_DESC_TYPE_ENDPOINT,              /* bDescriptorType: Endpoint */
        _CDC_IN_EP,                          /* bEndpointAddress */
        0x02,                                /* bmAttributes: Bulk */
        LOBYTE(CDC_DATA_HS_MAX_PACKET_SIZE), /* wMaxPacketSize: */
        HIBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),
        0x00, /* bInterval: ignore for Bulk transfer */
#endif

#if (NUMBER_OF_CDC > 5)
        /********************  CDC5 block ********************/
        /******** IAD to associate the two CDC interfaces */
        0x08,             /* bLength */
        0x0B,             /* bDescriptorType */
        _CDC_CMD_ITF_NBR, /* bFirstInterface */
        0x02,             /* bInterfaceCount */
        0x02,             /* bFunctionClass */
        0x02,             /* bFunctionSubClass */
        0x01,             /* bFunctionProtocol */
        0x00,             /* iFunction (Index of string descriptor describing this function) */

        /* Interface Descriptor */
        0x09,                    /* bLength: Interface Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: Interface */
        _CDC_CMD_ITF_NBR,        /* bInterfaceNumber: Number of Interface */
        0x00,                    /* bAlternateSetting: Alternate setting */
        0x01,                    /* bNumEndpoints: One endpoints used */
        0x02,                    /* bInterfaceClass: Communication Interface Class */
        0x02,                    /* bInterfaceSubClass: Abstract Control Model */
        0x01,                    /* bInterfaceProtocol: Common AT commands */
        _CDC_STR_DESC_IDX,       /* 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 */
        _CDC_COM_ITF_NBR, /* bDataInterface: 1 */

        /* 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 */
        _CDC_CMD_ITF_NBR, /* bMasterInterface: Communication class interface */
        _CDC_COM_ITF_NBR, /* 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_HS_BINTERVAL, /* bInterval: */
        /*---------------------------------------------------------------------------*/

        /* Data class interface descriptor */
        0x09,                    /* bLength: Endpoint Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: */
        _CDC_COM_ITF_NBR,        /* 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_HS_MAX_PACKET_SIZE), /* wMaxPacketSize: */
        HIBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),
        0x00, /* bInterval: ignore for Bulk transfer */

        /* Endpoint IN Descriptor */
        0x07,                                /* bLength: Endpoint Descriptor size */
        USB_DESC_TYPE_ENDPOINT,              /* bDescriptorType: Endpoint */
        _CDC_IN_EP,                          /* bEndpointAddress */
        0x02,                                /* bmAttributes: Bulk */
        LOBYTE(CDC_DATA_HS_MAX_PACKET_SIZE), /* wMaxPacketSize: */
        HIBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),
        0x00, /* bInterval: ignore for Bulk transfer */
#endif

#if (NUMBER_OF_CDC > 6)
        /********************  CDC6 block ********************/
        /******** IAD to associate the two CDC interfaces */
        0x08,             /* bLength */
        0x0B,             /* bDescriptorType */
        _CDC_CMD_ITF_NBR, /* bFirstInterface */
        0x02,             /* bInterfaceCount */
        0x02,             /* bFunctionClass */
        0x02,             /* bFunctionSubClass */
        0x01,             /* bFunctionProtocol */
        0x00,             /* iFunction (Index of string descriptor describing this function) */

        /* Interface Descriptor */
        0x09,                    /* bLength: Interface Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: Interface */
        _CDC_CMD_ITF_NBR,        /* bInterfaceNumber: Number of Interface */
        0x00,                    /* bAlternateSetting: Alternate setting */
        0x01,                    /* bNumEndpoints: One endpoints used */
        0x02,                    /* bInterfaceClass: Communication Interface Class */
        0x02,                    /* bInterfaceSubClass: Abstract Control Model */
        0x01,                    /* bInterfaceProtocol: Common AT commands */
        _CDC_STR_DESC_IDX,       /* 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 */
        _CDC_COM_ITF_NBR, /* bDataInterface: 1 */

        /* 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 */
        _CDC_CMD_ITF_NBR, /* bMasterInterface: Communication class interface */
        _CDC_COM_ITF_NBR, /* 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_HS_BINTERVAL, /* bInterval: */
        /*---------------------------------------------------------------------------*/

        /* Data class interface descriptor */
        0x09,                    /* bLength: Endpoint Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: */
        _CDC_COM_ITF_NBR,        /* 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_HS_MAX_PACKET_SIZE), /* wMaxPacketSize: */
        HIBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),
        0x00, /* bInterval: ignore for Bulk transfer */

        /* Endpoint IN Descriptor */
        0x07,                                /* bLength: Endpoint Descriptor size */
        USB_DESC_TYPE_ENDPOINT,              /* bDescriptorType: Endpoint */
        _CDC_IN_EP,                          /* bEndpointAddress */
        0x02,                                /* bmAttributes: Bulk */
        LOBYTE(CDC_DATA_HS_MAX_PACKET_SIZE), /* wMaxPacketSize: */
        HIBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),
        0x00, /* bInterval: ignore for Bulk transfer */
#endif

#if (NUMBER_OF_CDC > 7)
        /********************  CDC7 block ********************/
        /******** IAD to associate the two CDC interfaces */
        0x08,             /* bLength */
        0x0B,             /* bDescriptorType */
        _CDC_CMD_ITF_NBR, /* bFirstInterface */
        0x02,             /* bInterfaceCount */
        0x02,             /* bFunctionClass */
        0x02,             /* bFunctionSubClass */
        0x01,             /* bFunctionProtocol */
        0x00,             /* iFunction (Index of string descriptor describing this function) */

        /* Interface Descriptor */
        0x09,                    /* bLength: Interface Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: Interface */
        _CDC_CMD_ITF_NBR,        /* bInterfaceNumber: Number of Interface */
        0x00,                    /* bAlternateSetting: Alternate setting */
        0x01,                    /* bNumEndpoints: One endpoints used */
        0x02,                    /* bInterfaceClass: Communication Interface Class */
        0x02,                    /* bInterfaceSubClass: Abstract Control Model */
        0x01,                    /* bInterfaceProtocol: Common AT commands */
        _CDC_STR_DESC_IDX,       /* 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 */
        _CDC_COM_ITF_NBR, /* bDataInterface: 1 */

        /* 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 */
        _CDC_CMD_ITF_NBR, /* bMasterInterface: Communication class interface */
        _CDC_COM_ITF_NBR, /* 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_HS_BINTERVAL, /* bInterval: */
        /*---------------------------------------------------------------------------*/

        /* Data class interface descriptor */
        0x09,                    /* bLength: Endpoint Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: */
        _CDC_COM_ITF_NBR,        /* 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_HS_MAX_PACKET_SIZE), /* wMaxPacketSize: */
        HIBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),
        0x00, /* bInterval: ignore for Bulk transfer */

        /* Endpoint IN Descriptor */
        0x07,                                /* bLength: Endpoint Descriptor size */
        USB_DESC_TYPE_ENDPOINT,              /* bDescriptorType: Endpoint */
        _CDC_IN_EP,                          /* bEndpointAddress */
        0x02,                                /* bmAttributes: Bulk */
        LOBYTE(CDC_DATA_HS_MAX_PACKET_SIZE), /* wMaxPacketSize: */
        HIBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),
        0x00 /* bInterval: ignore for Bulk transfer */
#endif
};

/* USB CDC device Configuration Descriptor */
__ALIGN_BEGIN static uint8_t USBD_CDC_CfgFSDesc[USB_CDC_CONFIG_DESC_SIZ] __ALIGN_END =
    {
        /* Configuration Descriptor */
        0x09,                            /* bLength: Configuration Descriptor size */
        USB_DESC_TYPE_CONFIGURATION,     /* bDescriptorType: Configuration */
        LOBYTE(USB_CDC_CONFIG_DESC_SIZ), /* wTotalLength:no of returned bytes */
        HIBYTE(USB_CDC_CONFIG_DESC_SIZ),
        0x02, /* bNumInterfaces: 2 interface */
        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_MAX_POWER, /* MaxPower 100 mA */

        /*---------------------------------------------------------------------------*/
        /********************  CDC0 block ********************/
        /******** IAD to associate the two CDC interfaces */
        0x08,             /* bLength */
        0x0B,             /* bDescriptorType */
        _CDC_CMD_ITF_NBR, /* bFirstInterface */
        0x02,             /* bInterfaceCount */
        0x02,             /* bFunctionClass */
        0x02,             /* bFunctionSubClass */
        0x01,             /* bFunctionProtocol */
        0x00,             /* iFunction (Index of string descriptor describing this function) */

        /* Interface Descriptor */
        0x09,                    /* bLength: Interface Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: Interface */
        /* Interface descriptor type */
        _CDC_CMD_ITF_NBR, /* bInterfaceNumber: Number of Interface */
        0x00,             /* bAlternateSetting: Alternate setting */
        0x01,             /* bNumEndpoints: One endpoints used */
        0x02,             /* bInterfaceClass: Communication Interface Class */
        0x02,             /* bInterfaceSubClass: Abstract Control Model */
        0x01,             /* bInterfaceProtocol: Common AT commands */
        _CDC_STR_DESC_IDX,/* 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 */
        _CDC_COM_ITF_NBR, /* bDataInterface: 1 */

        /* 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 */
        _CDC_CMD_ITF_NBR, /* bMasterInterface: Communication class interface */
        _CDC_COM_ITF_NBR, /* 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: */
        _CDC_COM_ITF_NBR,        /* 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: ignore for Bulk transfer */

        /* 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: ignore for Bulk transfer */

#if (NUMBER_OF_CDC > 1)
        /********************  CDC1 block ********************/
        /******** IAD to associate the two CDC interfaces */
        0x08,             /* bLength */
        0x0B,             /* bDescriptorType */
        _CDC_CMD_ITF_NBR, /* bFirstInterface */
        0x02,             /* bInterfaceCount */
        0x02,             /* bFunctionClass */
        0x02,             /* bFunctionSubClass */
        0x01,             /* bFunctionProtocol */
        0x00,             /* iFunction (Index of string descriptor describing this function) */

        /* Interface Descriptor */
        0x09,                    /* bLength: Interface Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: Interface */
        /* Interface descriptor type */
        _CDC_CMD_ITF_NBR, /* bInterfaceNumber: Number of Interface */
        0x00,             /* bAlternateSetting: Alternate setting */
        0x01,             /* bNumEndpoints: One endpoints used */
        0x02,             /* bInterfaceClass: Communication Interface Class */
        0x02,             /* bInterfaceSubClass: Abstract Control Model */
        0x01,             /* bInterfaceProtocol: Common AT commands */
        _CDC_STR_DESC_IDX,/* 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 */
        _CDC_COM_ITF_NBR, /* bDataInterface: 1 */

        /* 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 */
        _CDC_CMD_ITF_NBR, /* bMasterInterface: Communication class interface */
        _CDC_COM_ITF_NBR, /* 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: */
        _CDC_COM_ITF_NBR,        /* 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: ignore for Bulk transfer */

        /* 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: ignore for Bulk transfer */
#endif

#if (NUMBER_OF_CDC > 2)
        /********************  CDC2 block ********************/
        /******** IAD to associate the two CDC interfaces */
        0x08,             /* bLength */
        0x0B,             /* bDescriptorType */
        _CDC_CMD_ITF_NBR, /* bFirstInterface */
        0x02,             /* bInterfaceCount */
        0x02,             /* bFunctionClass */
        0x02,             /* bFunctionSubClass */
        0x01,             /* bFunctionProtocol */
        0x00,             /* iFunction (Index of string descriptor describing this function) */

        /* Interface Descriptor */
        0x09,                    /* bLength: Interface Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: Interface */
        /* Interface descriptor type */
        _CDC_CMD_ITF_NBR, /* bInterfaceNumber: Number of Interface */
        0x00,             /* bAlternateSetting: Alternate setting */
        0x01,             /* bNumEndpoints: One endpoints used */
        0x02,             /* bInterfaceClass: Communication Interface Class */
        0x02,             /* bInterfaceSubClass: Abstract Control Model */
        0x01,             /* bInterfaceProtocol: Common AT commands */
        _CDC_STR_DESC_IDX,/* 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 */
        _CDC_COM_ITF_NBR, /* bDataInterface: 1 */

        /* 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 */
        _CDC_CMD_ITF_NBR, /* bMasterInterface: Communication class interface */
        _CDC_COM_ITF_NBR, /* 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: */
        _CDC_COM_ITF_NBR,        /* 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: ignore for Bulk transfer */

        /* 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: ignore for Bulk transfer */
#endif

#if (NUMBER_OF_CDC > 3)
        /********************  CDC3 block ********************/
        /******** IAD to associate the two CDC interfaces */
        0x08,             /* bLength */
        0x0B,             /* bDescriptorType */
        _CDC_CMD_ITF_NBR, /* bFirstInterface */
        0x02,             /* bInterfaceCount */
        0x02,             /* bFunctionClass */
        0x02,             /* bFunctionSubClass */
        0x01,             /* bFunctionProtocol */
        0x00,             /* iFunction (Index of string descriptor describing this function) */

        /* Interface Descriptor */
        0x09,                    /* bLength: Interface Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: Interface */
        /* Interface descriptor type */
        _CDC_CMD_ITF_NBR, /* bInterfaceNumber: Number of Interface */
        0x00,             /* bAlternateSetting: Alternate setting */
        0x01,             /* bNumEndpoints: One endpoints used */
        0x02,             /* bInterfaceClass: Communication Interface Class */
        0x02,             /* bInterfaceSubClass: Abstract Control Model */
        0x01,             /* bInterfaceProtocol: Common AT commands */
        _CDC_STR_DESC_IDX,/* 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 */
        _CDC_COM_ITF_NBR, /* bDataInterface: 1 */

        /* 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 */
        _CDC_CMD_ITF_NBR, /* bMasterInterface: Communication class interface */
        _CDC_COM_ITF_NBR, /* 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: */
        _CDC_COM_ITF_NBR,        /* 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: ignore for Bulk transfer */

        /* 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: ignore for Bulk transfer */
#endif

#if (NUMBER_OF_CDC > 4)
        /********************  CDC4 block ********************/
        /******** IAD to associate the two CDC interfaces */
        0x08,             /* bLength */
        0x0B,             /* bDescriptorType */
        _CDC_CMD_ITF_NBR, /* bFirstInterface */
        0x02,             /* bInterfaceCount */
        0x02,             /* bFunctionClass */
        0x02,             /* bFunctionSubClass */
        0x01,             /* bFunctionProtocol */
        0x00,             /* iFunction (Index of string descriptor describing this function) */

        /* Interface Descriptor */
        0x09,                    /* bLength: Interface Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: Interface */
        /* Interface descriptor type */
        _CDC_CMD_ITF_NBR, /* bInterfaceNumber: Number of Interface */
        0x00,             /* bAlternateSetting: Alternate setting */
        0x01,             /* bNumEndpoints: One endpoints used */
        0x02,             /* bInterfaceClass: Communication Interface Class */
        0x02,             /* bInterfaceSubClass: Abstract Control Model */
        0x01,             /* bInterfaceProtocol: Common AT commands */
        _CDC_STR_DESC_IDX,/* 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 */
        _CDC_COM_ITF_NBR, /* bDataInterface: 1 */

        /* 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 */
        _CDC_CMD_ITF_NBR, /* bMasterInterface: Communication class interface */
        _CDC_COM_ITF_NBR, /* 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: */
        _CDC_COM_ITF_NBR,        /* 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: ignore for Bulk transfer */

        /* 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: ignore for Bulk transfer */
#endif

#if (NUMBER_OF_CDC > 5)
        /********************  CDC5 block ********************/
        /******** IAD to associate the two CDC interfaces */
        0x08,             /* bLength */
        0x0B,             /* bDescriptorType */
        _CDC_CMD_ITF_NBR, /* bFirstInterface */
        0x02,             /* bInterfaceCount */
        0x02,             /* bFunctionClass */
        0x02,             /* bFunctionSubClass */
        0x01,             /* bFunctionProtocol */
        0x00,             /* iFunction (Index of string descriptor describing this function) */

        /* Interface Descriptor */
        0x09,                    /* bLength: Interface Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: Interface */
        /* Interface descriptor type */
        _CDC_CMD_ITF_NBR, /* bInterfaceNumber: Number of Interface */
        0x00,             /* bAlternateSetting: Alternate setting */
        0x01,             /* bNumEndpoints: One endpoints used */
        0x02,             /* bInterfaceClass: Communication Interface Class */
        0x02,             /* bInterfaceSubClass: Abstract Control Model */
        0x01,             /* bInterfaceProtocol: Common AT commands */
        _CDC_STR_DESC_IDX,/* 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 */
        _CDC_COM_ITF_NBR, /* bDataInterface: 1 */

        /* 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 */
        _CDC_CMD_ITF_NBR, /* bMasterInterface: Communication class interface */
        _CDC_COM_ITF_NBR, /* 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: */
        _CDC_COM_ITF_NBR,        /* 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: ignore for Bulk transfer */

        /* 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: ignore for Bulk transfer */
#endif

#if (NUMBER_OF_CDC > 6)
        /********************  CDC6 block ********************/
        /******** IAD to associate the two CDC interfaces */
        0x08,             /* bLength */
        0x0B,             /* bDescriptorType */
        _CDC_CMD_ITF_NBR, /* bFirstInterface */
        0x02,             /* bInterfaceCount */
        0x02,             /* bFunctionClass */
        0x02,             /* bFunctionSubClass */
        0x01,             /* bFunctionProtocol */
        0x00,             /* iFunction (Index of string descriptor describing this function) */

        /* Interface Descriptor */
        0x09,                    /* bLength: Interface Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: Interface */
        /* Interface descriptor type */
        _CDC_CMD_ITF_NBR, /* bInterfaceNumber: Number of Interface */
        0x00,             /* bAlternateSetting: Alternate setting */
        0x01,             /* bNumEndpoints: One endpoints used */
        0x02,             /* bInterfaceClass: Communication Interface Class */
        0x02,             /* bInterfaceSubClass: Abstract Control Model */
        0x01,             /* bInterfaceProtocol: Common AT commands */
        _CDC_STR_DESC_IDX,/* 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 */
        _CDC_COM_ITF_NBR, /* bDataInterface: 1 */

        /* 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 */
        _CDC_CMD_ITF_NBR, /* bMasterInterface: Communication class interface */
        _CDC_COM_ITF_NBR, /* 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: */
        _CDC_COM_ITF_NBR,        /* 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: ignore for Bulk transfer */

        /* 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: ignore for Bulk transfer */
#endif

#if (NUMBER_OF_CDC > 7)
        /********************  CDC7 block ********************/
        /******** IAD to associate the two CDC interfaces */
        0x08,             /* bLength */
        0x0B,             /* bDescriptorType */
        _CDC_CMD_ITF_NBR, /* bFirstInterface */
        0x02,             /* bInterfaceCount */
        0x02,             /* bFunctionClass */
        0x02,             /* bFunctionSubClass */
        0x01,             /* bFunctionProtocol */
        0x00,             /* iFunction (Index of string descriptor describing this function) */

        /* Interface Descriptor */
        0x09,                    /* bLength: Interface Descriptor size */
        USB_DESC_TYPE_INTERFACE, /* bDescriptorType: Interface */
        /* Interface descriptor type */
        _CDC_CMD_ITF_NBR, /* bInterfaceNumber: Number of Interface */
        0x00,             /* bAlternateSetting: Alternate setting */
        0x01,             /* bNumEndpoints: One endpoints used */
        0x02,             /* bInterfaceClass: Communication Interface Class */
        0x02,             /* bInterfaceSubClass: Abstract Control Model */
        0x01,             /* bInterfaceProtocol: Common AT commands */
        _CDC_STR_DESC_IDX,/* 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 */
        _CDC_COM_ITF_NBR, /* bDataInterface: 1 */

        /* 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 */
        _CDC_CMD_ITF_NBR, /* bMasterInterface: Communication class interface */
        _CDC_COM_ITF_NBR, /* 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: */
        _CDC_COM_ITF_NBR,        /* 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: ignore for Bulk transfer */

        /* 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: ignore for Bulk transfer */
#endif
};

/**
  * @}
  */

/** @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_ACM_HandleTypeDef *hcdc = NULL;

  for (uint8_t i = 0; i < NUMBER_OF_CDC; i++)
  {
    hcdc = &CDC_ACM_Class_Data[i];

    if (pdev->dev_speed == USBD_SPEED_HIGH)
    {
      /* Open EP IN */
      (void)USBD_LL_OpenEP(pdev, CDC_IN_EP[i], USBD_EP_TYPE_BULK,
                           CDC_DATA_HS_IN_PACKET_SIZE);

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

      /* Open EP OUT */
      (void)USBD_LL_OpenEP(pdev, CDC_OUT_EP[i], USBD_EP_TYPE_BULK,
                           CDC_DATA_HS_OUT_PACKET_SIZE);

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

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

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

      /* Open EP OUT */
      (void)USBD_LL_OpenEP(pdev, CDC_OUT_EP[i], USBD_EP_TYPE_BULK,
                           CDC_DATA_FS_OUT_PACKET_SIZE);

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

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

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

    /* Init  physical Interface components */
    ((USBD_CDC_ACM_ItfTypeDef *)pdev->pUserData_CDC_ACM)->Init(i);

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

    if (pdev->dev_speed == USBD_SPEED_HIGH)
    {
      /* Prepare Out endpoint to receive next packet */
      (void)USBD_LL_PrepareReceive(pdev, CDC_OUT_EP[i], hcdc->RxBuffer,
                                   CDC_DATA_HS_OUT_PACKET_SIZE);
    }
    else
    {
      /* Prepare Out endpoint to receive next packet */
      (void)USBD_LL_PrepareReceive(pdev, CDC_OUT_EP[i], hcdc->RxBuffer,
                                   CDC_DATA_FS_OUT_PACKET_SIZE);
    }
  }
  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);
  for (uint8_t i = 0; i < NUMBER_OF_CDC; i++)
  {
    /* Close EP IN */
    (void)USBD_LL_CloseEP(pdev, CDC_IN_EP[i]);
    pdev->ep_in[CDC_IN_EP[i] & 0xFU].is_used = 0U;

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

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

    /* DeInit  physical Interface components */
    ((USBD_CDC_ACM_ItfTypeDef *)pdev->pUserData_CDC_ACM)->DeInit(i);
  }
  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_ACM_HandleTypeDef *hcdc = NULL;
  uint16_t len;
  uint8_t ifalt = 0U;
  uint16_t status_info = 0U;
  USBD_StatusTypeDef ret = USBD_OK;

  uint8_t windex_to_ch = 0;

  for (uint8_t i = 0; i < NUMBER_OF_CDC; i++)
  {
    if (LOBYTE(req->wIndex) == CDC_CMD_ITF_NBR[i] || LOBYTE(req->wIndex) == CDC_COM_ITF_NBR[i])
    {
      windex_to_ch = i;
      break;
    }
  }

  hcdc = &CDC_ACM_Class_Data[windex_to_ch];

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

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

        (void)USBD_CtlPrepareRx(pdev, (uint8_t *)hcdc->data[windex_to_ch], req->wLength);
      }
    }
    else
    {
      ((USBD_CDC_ACM_ItfTypeDef *)pdev->pUserData_CDC_ACM)->Control(windex_to_ch, 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_ACM_HandleTypeDef *hcdc = NULL;
  PCD_HandleTypeDef *hpcd = pdev->pData;
  uint8_t ep_to_ch = 0;

  for (uint8_t i = 0; i < NUMBER_OF_CDC; i++)
  {
    if (epnum == (CDC_IN_EP[i] & 0x0F))
    {
      ep_to_ch = i;
      break;
    }
  }

  hcdc = &CDC_ACM_Class_Data[ep_to_ch];

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

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

    if (((USBD_CDC_ACM_ItfTypeDef *)pdev->pUserData_CDC_ACM)->TransmitCplt != NULL)
    {
      ((USBD_CDC_ACM_ItfTypeDef *)pdev->pUserData_CDC_ACM)->TransmitCplt(ep_to_ch, 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_ACM_HandleTypeDef *hcdc = NULL;
  uint8_t ep_to_ch = 0;

  for (uint8_t i = 0; i < NUMBER_OF_CDC; i++)
  {
    if (epnum == CDC_OUT_EP[i])
    {
      ep_to_ch = i;
      break;
    }
  }

  hcdc = &CDC_ACM_Class_Data[ep_to_ch];

  /* 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_ACM_ItfTypeDef *)pdev->pUserData_CDC_ACM)->Receive(ep_to_ch, hcdc->RxBuffer, &hcdc->RxLength);

  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_ACM_HandleTypeDef *hcdc = NULL;

  for (uint8_t i = 0; i < NUMBER_OF_CDC; i++)
  {
    hcdc = &CDC_ACM_Class_Data[i];

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

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

  return (uint8_t)USBD_OK;
}

/**
  * @brief  USBD_CDC_GetFSCfgDesc
  *         Return configuration descriptor
  * @param  speed : current device speed
  * @param  length : pointer data length
  * @retval pointer to descriptor buffer
  */
static uint8_t *USBD_CDC_GetFSCfgDesc(uint16_t *length)
{
  *length = (uint16_t)sizeof(USBD_CDC_CfgFSDesc);

  return USBD_CDC_CfgFSDesc;
}

/**
  * @brief  USBD_CDC_GetHSCfgDesc
  *         Return configuration descriptor
  * @param  speed : current device speed
  * @param  length : pointer data length
  * @retval pointer to descriptor buffer
  */
static uint8_t *USBD_CDC_GetHSCfgDesc(uint16_t *length)
{
  *length = (uint16_t)sizeof(USBD_CDC_CfgHSDesc);

  return USBD_CDC_CfgHSDesc;
}

/**
  * @brief  USBD_CDC_GetOtherSpeedCfgDesc
  *         Return configuration descriptor
  * @param  speed : current device speed
  * @param  length : pointer data length
  * @retval pointer to descriptor buffer
  */
static uint8_t *USBD_CDC_GetOtherSpeedCfgDesc(uint16_t *length)
{
  *length = (uint16_t)sizeof(USBD_CDC_CfgFSDesc);

  return USBD_CDC_CfgFSDesc;
}

/**
  * @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;
}

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

  pdev->pUserData_CDC_ACM = fops;

  return (uint8_t)USBD_OK;
}

/**
  * @brief  USBD_CDC_SetTxBuffer
  * @param  pdev: device instance
  * @param  pbuff: Tx Buffer
  * @retval status
  */
uint8_t USBD_CDC_SetTxBuffer(uint8_t ch, USBD_HandleTypeDef *pdev,
                             uint8_t *pbuff, uint32_t length)
{
  USBD_CDC_ACM_HandleTypeDef *hcdc = NULL;

  hcdc = &CDC_ACM_Class_Data[ch];

  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(uint8_t ch, USBD_HandleTypeDef *pdev, uint8_t *pbuff)
{
  USBD_CDC_ACM_HandleTypeDef *hcdc = NULL;

  hcdc = &CDC_ACM_Class_Data[ch];

  hcdc->RxBuffer = pbuff;

  return (uint8_t)USBD_OK;
}

/**
  * @brief  USBD_CDC_TransmitPacket
  *         Transmit packet on IN endpoint
  * @param  pdev: device instance
  * @retval status
  */
uint8_t USBD_CDC_TransmitPacket(uint8_t ch, USBD_HandleTypeDef *pdev)
{
  USBD_CDC_ACM_HandleTypeDef *hcdc = NULL;
  USBD_StatusTypeDef ret = USBD_BUSY;

  hcdc = &CDC_ACM_Class_Data[ch];

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

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

    /* Transmit next packet */
    (void)USBD_LL_Transmit(pdev, CDC_IN_EP[ch], hcdc->TxBuffer, hcdc->TxLength);

    ret = USBD_OK;
  }

  return (uint8_t)ret;
}

/**
  * @brief  USBD_CDC_ACM_ReceivePacket
  *         prepare OUT Endpoint for reception
  * @param  pdev: device instance
  * @retval status
  */
uint8_t USBD_CDC_ReceivePacket(uint8_t ch, USBD_HandleTypeDef *pdev)
{
  USBD_CDC_ACM_HandleTypeDef *hcdc = NULL;

  hcdc = &CDC_ACM_Class_Data[ch];

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

  return (uint8_t)USBD_OK;
}

void USBD_Update_CDC_ACM_DESC(uint8_t *desc,
                              uint8_t cmd_itf,
                              uint8_t com_itf,
                              uint8_t in_ep,
                              uint8_t cmd_ep,
                              uint8_t out_ep,
                              uint8_t str_idx)
{
  desc += 9;
  for (uint8_t i = 0; i < NUMBER_OF_CDC; i++)
  {
    desc[2] = cmd_itf;
    desc[16] = str_idx;
    desc[10] = cmd_itf;
    desc[26] = com_itf;
    desc[34] = cmd_itf;
    desc[35] = com_itf;
    desc[38] = cmd_ep;
    desc[45] = com_itf;
    desc[54] = out_ep;
    desc[61] = in_ep;

    desc += 66;
    CDC_IN_EP[i] = in_ep;
    CDC_OUT_EP[i] = out_ep;
    CDC_CMD_EP[i] = cmd_ep;
    CDC_CMD_ITF_NBR[i] = cmd_itf;
    CDC_COM_ITF_NBR[i] = com_itf;
    CDC_STR_DESC_IDX[i] = str_idx;

    in_ep += 2;
    cmd_ep = in_ep + 1;
    out_ep++;
    str_idx++;

    cmd_itf += 2;
    com_itf = cmd_itf + 1;
  }
}
/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
