path: root/stmhal/usbdev/class/cdc_hid/src/usbd_cdc_hid.c

#include "usbd_ioreq.h"
#include "usbd_cdc_hid.h"

#define USB_DESC_TYPE_ASSOCIATION (0x0b)

#define CDC_CMD_PACKET_SIZE                  8  // Control Endpoint Packet size
#define CDC_DATA_FS_IN_PACKET_SIZE                CDC_DATA_FS_MAX_PACKET_SIZE
#define CDC_DATA_FS_OUT_PACKET_SIZE               CDC_DATA_FS_MAX_PACKET_SIZE

#define HID_MAX_FS_PACKET             0x04
#define USB_HID_DESC_SIZ              9
#define HID_MOUSE_REPORT_DESC_SIZE    74
#define HID_KEYBOARD_REPORT_DESC_SIZE 63
#define HID_DESCRIPTOR_TYPE           0x21
#define HID_REPORT_DESC               0x22
#define HID_REQ_SET_PROTOCOL          0x0B
#define HID_REQ_GET_PROTOCOL          0x03
#define HID_REQ_SET_IDLE              0x0A
#define HID_REQ_GET_IDLE              0x02

typedef enum {
  HID_IDLE = 0,
  HID_BUSY,
} HID_StateTypeDef;

typedef struct {
  uint32_t             Protocol;
  uint32_t             IdleState;
  uint32_t             AltSetting;
  HID_StateTypeDef     state;
} USBD_HID_HandleTypeDef;

static USBD_CDC_ItfTypeDef *CDC_fops;

static USBD_CDC_HandleTypeDef CDC_ClassData;
static USBD_HID_HandleTypeDef HID_ClassData;

// I don't think we can make these descriptors constant because they are
// modified (perhaps unnecessarily) by the USB driver.

// USB Standard Device Descriptor
__ALIGN_BEGIN static uint8_t USBD_CDC_HID_DeviceQualifierDesc[USB_LEN_DEV_QUALIFIER_DESC] __ALIGN_END = {
    USB_LEN_DEV_QUALIFIER_DESC,
    USB_DESC_TYPE_DEVICE_QUALIFIER,
    0x00,
    0x02,
    0x00,
    0x00,
    0x00,
    0x40, // maximum of: 0x40 for CDC, 0x04 for HID
    0x01,
    0x00,
};

// USB CDC HID device Configuration Descriptor
__ALIGN_BEGIN static uint8_t USBD_CDC_HID_CfgFSDesc[USB_CDC_HID_CONFIG_DESC_SIZ] __ALIGN_END = {
    //--------------------------------------------------------------------------
    // Configuration Descriptor
    0x09,   // bLength: Configuration Descriptor size
    USB_DESC_TYPE_CONFIGURATION, // bDescriptorType: Configuration
    LOBYTE(USB_CDC_HID_CONFIG_DESC_SIZ), // wTotalLength: no of returned bytes
    HIBYTE(USB_CDC_HID_CONFIG_DESC_SIZ),
    USB_CDC_HID_NUM_INTERFACES, // bNumInterfaces: 3 interfaces
    0x01,   // bConfigurationValue: Configuration value
    0x00,   // iConfiguration: Index of string descriptor describing the configuration
    0x80,   // bmAttributes: bus powered; 0xc0 for self powered
    0xfa,   // bMaxPower: in units of 2mA

#if USB_CDC_HID_USE_CDC
    //==========================================================================
    // Interface Association for CDC VCP
    0x08,   // bLength: 8 bytes
    USB_DESC_TYPE_ASSOCIATION, // bDescriptorType: IAD
    CDC_IFACE_NUM, // bFirstInterface: first interface for this association
    0x02,   // bInterfaceCount: nummber of interfaces for this association
    0x00,   // bFunctionClass: ?
    0x00,   // bFunctionSubClass: ?
    0x00,   // bFunctionProtocol: ?
    0x00,   // iFunction: index of string for this function

    //--------------------------------------------------------------------------
    // Interface Descriptor
    0x09,   // bLength: Interface Descriptor size
    USB_DESC_TYPE_INTERFACE, // bDescriptorType: Interface
    CDC_IFACE_NUM, // 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
    0x00,   // iInterface:

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

    // Call Management Functional Descriptor
    0x05,   // bFunctionLength
    0x24,   // bDescriptorType: CS_INTERFACE
    0x01,   // bDescriptorSubtype: Call Management Func Desc
    0x00,   // bmCapabilities: D0+D1
    CDC_IFACE_NUM + 1,   // 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_IFACE_NUM + 0,   // bMasterInterface: Communication class interface
    CDC_IFACE_NUM + 1,   // 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),
    0x20,                           // bInterval: polling interval in frames of 1ms

    //--------------------------------------------------------------------------
    // Data class interface descriptor
    0x09,   // bLength: Endpoint Descriptor size
    USB_DESC_TYPE_INTERFACE, // bDescriptorType: interface
    CDC_IFACE_NUM + 1,   // 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 USB_CDC_HID_USE_HID
    //==========================================================================
    // HID only has 1 interface so doesn't need an IAD

    //--------------------------------------------------------------------------
    // Interface Descriptor
    0x09,   // bLength: Interface Descriptor size
    USB_DESC_TYPE_INTERFACE, // bDescriptorType: interface descriptor
    HID_IFACE_NUM, // bInterfaceNumber: Number of Interface
    0x00,   // bAlternateSetting: Alternate setting
    0x01,   // bNumEndpoints
    0x03,   // bInterfaceClass: HID Class
    0x01,   // bInterfaceSubClass: 1=BOOT, 0=no boot
    0x01,   // nInterfaceProtocol: 0=none, 1=keyboard, 2=mouse
    0x00,   // iInterface:

    // HID descriptor
    0x09,                   // bLength: HID Descriptor size
    HID_DESCRIPTOR_TYPE,    // bDescriptorType: HID
    0x11,                   // bcdHID: HID Class Spec release number
    0x01,
    0x00,                   // bCountryCode: Hardware target country
    0x01,                   // bNumDescriptors: Number of HID class descriptors to follow
    0x22,                   // bDescriptorType
    HID_MOUSE_REPORT_DESC_SIZE, // wItemLength: Total length of Report descriptor
    0x00,

    // Endpoint IN descriptor
    0x07,                           // bLength: Endpoint descriptor length
    USB_DESC_TYPE_ENDPOINT,         // bDescriptorType: Endpoint descriptor type
    HID_IN_EP,                      // bEndpointAddress: IN
    0x03,                           // bmAttributes: Interrupt endpoint type
    LOBYTE(HID_MAX_FS_PACKET),      // wMaxPacketSize
    HIBYTE(HID_MAX_FS_PACKET),
    0x08,                           // bInterval: Polling interval
#endif
};

#if USB_CDC_HID_USE_HID
/* USB HID device Configuration Descriptor */
__ALIGN_BEGIN static uint8_t USBD_HID_Desc[USB_HID_DESC_SIZ] __ALIGN_END = {
  0x09,         /*bLength: HID Descriptor size*/
  HID_DESCRIPTOR_TYPE, /*bDescriptorType: HID*/
  0x11,         /*bcdHID: HID Class Spec release number*/
  0x01,
  0x00,         /*bCountryCode: Hardware target country*/
  0x01,         /*bNumDescriptors: Number of HID class descriptors to follow*/
  0x22,         /*bDescriptorType*/
  HID_MOUSE_REPORT_DESC_SIZE,/*wItemLength: Total length of Report descriptor*/
  0x00,
};

__ALIGN_BEGIN static uint8_t HID_MOUSE_ReportDesc[HID_MOUSE_REPORT_DESC_SIZE] __ALIGN_END = {
  0x05,   0x01,
  0x09,   0x02,
  0xA1,   0x01,
  0x09,   0x01,

  0xA1,   0x00,
  0x05,   0x09,
  0x19,   0x01,
  0x29,   0x03,

  0x15,   0x00,
  0x25,   0x01,
  0x95,   0x03,
  0x75,   0x01,

  0x81,   0x02,
  0x95,   0x01,
  0x75,   0x05,
  0x81,   0x01,

  0x05,   0x01,
  0x09,   0x30,
  0x09,   0x31,
  0x09,   0x38,

  0x15,   0x81,
  0x25,   0x7F,
  0x75,   0x08,
  0x95,   0x03,

  0x81,   0x06,
  0xC0,   0x09,
  0x3c,   0x05,
  0xff,   0x09,

  0x01,   0x15,
  0x00,   0x25,
  0x01,   0x75,
  0x01,   0x95,

  0x02,   0xb1,
  0x22,   0x75,
  0x06,   0x95,
  0x01,   0xb1,

  0x01,   0xc0
};

#if 0
__ALIGN_BEGIN static const uint8_t HID_KEYBOARD_ReportDesc[HID_KEYBOARD_REPORT_DESC_SIZE] __ALIGN_END = {
    // From p69 of http://www.usb.org/developers/devclass_docs/HID1_11.pdf
    0x05, 0x01,     // Usage Page (Generic Desktop),
    0x09, 0x06,     // Usage (Keyboard),
    0xA1, 0x01,     // Collection (Application),
    0x05, 0x07,         // Usage Page (Key Codes);
    0x19, 0xE0,         // Usage Minimum (224),
    0x29, 0xE7,         // Usage Maximum (231),
    0x15, 0x00,         // Logical Minimum (0),
    0x25, 0x01,         // Logical Maximum (1),
    0x75, 0x01,         // Report Size (1),
    0x95, 0x08,         // Report Count (8),
    0x81, 0x02,         // Input (Data, Variable, Absolute), ;Modifier byte
    0x95, 0x01,         // Report Count (1),
    0x75, 0x08,         // Report Size (8),
    0x81, 0x01,         // Input (Constant), ;Reserved byte
    0x95, 0x05,         // Report Count (5),
    0x75, 0x01,         // Report Size (1),
    0x05, 0x08,         // Usage Page (Page# for LEDs),
    0x19, 0x01,         // Usage Minimum (1),
    0x29, 0x05,         // Usage Maximum (5),
    0x91, 0x02,         // Output (Data, Variable, Absolute), ;LED report
    0x95, 0x01,         // Report Count (1),
    0x75, 0x03,         // Report Size (3),
    0x91, 0x01,         // Output (Constant), ;LED report padding
    0x95, 0x06,         // Report Count (6),
    0x75, 0x08,         // Report Size (8),
    0x15, 0x00,         // Logical Minimum (0),
    0x25, 0x65,         // Logical Maximum(101),
    0x05, 0x07,         // Usage Page (Key Codes),
    0x19, 0x00,         // Usage Minimum (0),
    0x29, 0x65,         // Usage Maximum (101),
    0x81, 0x00,         // Input (Data, Array), ;Key arrays (6 bytes)
    0xC0            // End Collection
};
#endif
#endif

static uint8_t USBD_CDC_HID_Init(USBD_HandleTypeDef *pdev, uint8_t cfgidx) {
    if (pdev->dev_speed == USBD_SPEED_HIGH) {
        // can't handle high speed
        return 1;
    }

#if USB_CDC_HID_USE_CDC
    //----------------------------------
    // CDC VCP component

    // Open EP IN
    USBD_LL_OpenEP(pdev,
                   CDC_IN_EP,
                   USBD_EP_TYPE_BULK,
                   CDC_DATA_FS_IN_PACKET_SIZE);

    // Open EP OUT
    USBD_LL_OpenEP(pdev,
                   CDC_OUT_EP,
                   USBD_EP_TYPE_BULK,
                   CDC_DATA_FS_OUT_PACKET_SIZE);

    // Open Command IN EP
    USBD_LL_OpenEP(pdev,
                   CDC_CMD_EP,
                   USBD_EP_TYPE_INTR,
                   CDC_CMD_PACKET_SIZE);

    // Init physical Interface components
    CDC_fops->Init();

    // Init Xfer states
    CDC_ClassData.TxState =0;
    CDC_ClassData.RxState =0;

    // Prepare Out endpoint to receive next packet
    USBD_LL_PrepareReceive(pdev, CDC_OUT_EP, CDC_ClassData.RxBuffer, CDC_DATA_FS_OUT_PACKET_SIZE);
#endif

#if USB_CDC_HID_USE_HID
    //----------------------------------
    // HID component

    // Open EP IN
    USBD_LL_OpenEP(pdev,
                   HID_IN_EP,
                   USBD_EP_TYPE_INTR,
                   HID_MAX_FS_PACKET);

    HID_ClassData.state = HID_IDLE;
#endif

    return 0;
}

static uint8_t USBD_CDC_HID_DeInit(USBD_HandleTypeDef *pdev, uint8_t cfgidx) {
#if USD_CDC
    //----------------------------------
    // CDC VCP component

    // close endpoints
    USBD_LL_CloseEP(pdev, CDC_IN_EP);
    USBD_LL_CloseEP(pdev, CDC_OUT_EP);
    USBD_LL_CloseEP(pdev, CDC_CMD_EP);

    // DeInit physical Interface components
    CDC_fops->DeInit();
#endif

#if USB_CDC_HID_USE_HID
    //----------------------------------
    // HID component

    // close endpoints
    USBD_LL_CloseEP(pdev, HID_IN_EP);
#endif

    return 0;
}

static uint8_t USBD_CDC_HID_Setup(USBD_HandleTypeDef *pdev, USBD_SetupReqTypedef *req) {

    /*
    printf("SU: %x %x %x %x\n", req->bmRequest, req->bRequest, req->wValue, req->wIndex);
    */

    switch (req->bmRequest & USB_REQ_TYPE_MASK) {

        // Class request
        case USB_REQ_TYPE_CLASS:
            // req->wIndex is the recipient interface number
            if (0) {
#if USB_CDC_HID_USE_CDC
            } else if (req->wIndex == CDC_IFACE_NUM) {
                // CDC component
                if (req->wLength) {
                    if (req->bmRequest & 0x80) {
                        // device-to-host request
                        CDC_fops->Control(req->bRequest, (uint8_t*)CDC_ClassData.data, req->wLength);
                        USBD_CtlSendData(pdev, (uint8_t*)CDC_ClassData.data, req->wLength);
                    } else {
                        // host-to-device request
                        CDC_ClassData.CmdOpCode = req->bRequest;
                        CDC_ClassData.CmdLength = req->wLength;
                        USBD_CtlPrepareRx(pdev, (uint8_t*)CDC_ClassData.data, req->wLength);
                    }
                } else {
                    // Not a Data request
                    // Transfer the command to the interface layer
                    return CDC_fops->Control(req->bRequest, NULL, req->wValue);
                }
                break;
#endif
#if USB_CDC_HID_USE_HID
            } else if (req->wIndex == HID_IFACE_NUM) {
    switch (req->bRequest) {
    case HID_REQ_SET_PROTOCOL:
      HID_ClassData.Protocol = (uint8_t)(req->wValue);
      break;

    case HID_REQ_GET_PROTOCOL:
      USBD_CtlSendData (pdev, (uint8_t *)&HID_ClassData.Protocol, 1);
      break;

    case HID_REQ_SET_IDLE:
      HID_ClassData.IdleState = (uint8_t)(req->wValue >> 8);
      break;

    case HID_REQ_GET_IDLE:
      USBD_CtlSendData (pdev, (uint8_t *)&HID_ClassData.IdleState, 1);
      break;

    default:
      USBD_CtlError (pdev, req);
      return USBD_FAIL;
    }
                break;
            }
#endif
      break;

    /* Interface & Endpoint request */
    case USB_REQ_TYPE_STANDARD:
#if USB_CDC_HID_USE_HID
        // HID only
        switch (req->bRequest) {
            case USB_REQ_GET_DESCRIPTOR: {
              uint16_t len = 0;
              const uint8_t *pbuf = NULL;
              if (req->wValue >> 8 == HID_REPORT_DESC) {
                len = MIN(HID_MOUSE_REPORT_DESC_SIZE , req->wLength);
                pbuf = HID_MOUSE_ReportDesc;
              } else if (req->wValue >> 8 == HID_DESCRIPTOR_TYPE) {
                len = MIN(USB_HID_DESC_SIZ , req->wLength);
                pbuf = USBD_HID_Desc;
              }
              USBD_CtlSendData(pdev, (uint8_t*)pbuf, len);
              break;
             }

            case USB_REQ_GET_INTERFACE:
              USBD_CtlSendData (pdev, (uint8_t *)&HID_ClassData.AltSetting, 1);
              break;

            case USB_REQ_SET_INTERFACE:
              HID_ClassData.AltSetting = (uint8_t)(req->wValue);
              break;
        }
#endif
        break;
    }
    return USBD_OK;
}

static uint8_t USBD_CDC_HID_EP0_RxReady(USBD_HandleTypeDef *pdev) {
  if((CDC_fops != NULL) && (CDC_ClassData.CmdOpCode != 0xFF)) {
    CDC_fops->Control(CDC_ClassData.CmdOpCode, (uint8_t *)CDC_ClassData.data, CDC_ClassData.CmdLength);
      CDC_ClassData.CmdOpCode = 0xFF;
  }
  return USBD_OK;
}

static uint8_t USBD_CDC_HID_DataIn(USBD_HandleTypeDef *pdev, uint8_t epnum) {
    switch (epnum) {
#if USB_CDC_HID_USE_CDC
        case (CDC_IN_EP & 0x7f):
        case (CDC_CMD_EP & 0x7f):
            CDC_ClassData.TxState = 0;
            return USBD_OK;
#endif
#if USB_CDC_HID_USE_HID
        case (HID_IN_EP & 0x7f):
            /* Ensure that the FIFO is empty before a new transfer, this condition could
            be caused by  a new transfer before the end of the previous transfer */
            HID_ClassData.state = HID_IDLE;
            return USBD_OK;
#endif
    }

    return USBD_OK;
}

static uint8_t USBD_CDC_HID_DataOut(USBD_HandleTypeDef *pdev, uint8_t epnum) {
    switch (epnum) {
#if USB_CDC_HID_USE_CDC
        case (CDC_OUT_EP & 0x7f):
            /* Get the received data length */
            CDC_ClassData.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 */
            CDC_fops->Receive(CDC_ClassData.RxBuffer, &CDC_ClassData.RxLength);

            return USBD_OK;
#endif
    }

    return USBD_OK;
}

static uint8_t *USBD_CDC_HID_GetFSCfgDesc(uint16_t *length) {
    *length = sizeof(USBD_CDC_HID_CfgFSDesc);
    return USBD_CDC_HID_CfgFSDesc;
}

static uint8_t *USBD_CDC_HID_GetHSCfgDesc(uint16_t *length) {
    *length = 0;
    return USBD_CDC_HID_CfgFSDesc; // need to return something because the USB driver writes bytes to the result
}

static uint8_t *USBD_CDC_HID_GetOtherSpeedCfgDesc (uint16_t *length) {
    *length = 0;
    return USBD_CDC_HID_CfgFSDesc; // need to return something because the USB driver writes bytes to the result
}

uint8_t *USBD_CDC_HID_GetDeviceQualifierDescriptor (uint16_t *length) {
    *length = sizeof(USBD_CDC_HID_DeviceQualifierDesc);
    return USBD_CDC_HID_DeviceQualifierDesc;
}

uint8_t USBD_CDC_RegisterInterface(USBD_HandleTypeDef *pdev, USBD_CDC_ItfTypeDef *fops) {
    if (fops == NULL) {
        return USBD_FAIL;
    } else {
        CDC_fops = fops;
        return USBD_OK;
    }
}

/**
  * @brief  USBD_CDC_SetTxBuffer
  * @param  pdev: device instance
  * @param  pbuff: Tx Buffer
  * @retval status
  */
uint8_t  USBD_CDC_SetTxBuffer  (USBD_HandleTypeDef   *pdev,
                                uint8_t  *pbuff,
                                uint16_t length)
{
  CDC_ClassData.TxBuffer = pbuff;
  CDC_ClassData.TxLength = length;

  return USBD_OK;
}


/**
  * @brief  USBD_CDC_SetRxBuffer
  * @param  pdev: device instance
  * @param  pbuff: Rx Buffer
  * @retval status
  */
uint8_t  USBD_CDC_SetRxBuffer  (USBD_HandleTypeDef   *pdev,
                                   uint8_t  *pbuff)
{
  CDC_ClassData.RxBuffer = pbuff;

  return USBD_OK;
}

/**
  * @brief  USBD_CDC_DataOut
  *         Data received on non-control Out endpoint
  * @param  pdev: device instance
  * @param  epnum: endpoint number
  * @retval status
  */
uint8_t  USBD_CDC_TransmitPacket(USBD_HandleTypeDef *pdev) {
    if(CDC_ClassData.TxState == 0) {

      /* Transmit next packet */
      USBD_LL_Transmit(pdev,
                       CDC_IN_EP,
                       CDC_ClassData.TxBuffer,
                       CDC_ClassData.TxLength);

      /* Tx Transfer in progress */
      CDC_ClassData.TxState = 1;
      return USBD_OK;
    }
    else
    {
      return USBD_BUSY;
    }
}


/**
  * @brief  USBD_CDC_ReceivePacket
  *         prepare OUT Endpoint for reception
  * @param  pdev: device instance
  * @retval status
  */
uint8_t USBD_CDC_ReceivePacket(USBD_HandleTypeDef *pdev) {
    // Suspend or Resume USB Out process
    if (pdev->dev_speed == USBD_SPEED_HIGH) {
        return USBD_FAIL;
    }

    // Prepare Out endpoint to receive next packet */
    USBD_LL_PrepareReceive(pdev,
                           CDC_OUT_EP,
                           CDC_ClassData.RxBuffer,
                           CDC_DATA_FS_OUT_PACKET_SIZE);

    return USBD_OK;
}

uint8_t USBD_HID_SendReport(USBD_HandleTypeDef *pdev, uint8_t *report, uint16_t len) {
    if (pdev->dev_state == USBD_STATE_CONFIGURED) {
        if (HID_ClassData.state == HID_IDLE) {
            HID_ClassData.state = HID_BUSY;
            USBD_LL_Transmit(pdev, HID_IN_EP, report, len);
        }
    }
    return USBD_OK;
}

// CDC + HID interface class callbacks structure
USBD_ClassTypeDef USBD_CDC_HID = {
    USBD_CDC_HID_Init,
    USBD_CDC_HID_DeInit,
    USBD_CDC_HID_Setup,
    NULL, // EP0_TxSent
    USBD_CDC_HID_EP0_RxReady,
    USBD_CDC_HID_DataIn,
    USBD_CDC_HID_DataOut,
    NULL, // SOF
    NULL,
    NULL,
    USBD_CDC_HID_GetHSCfgDesc,
    USBD_CDC_HID_GetFSCfgDesc,
    USBD_CDC_HID_GetOtherSpeedCfgDesc,
    USBD_CDC_HID_GetDeviceQualifierDescriptor,
};