ST意法半导体中文论坛STM32F4的usb

STM32F4的usb_device请教

mantishell 提问时间：2015-3-8 15:24 /

问答
是否解决:

  发现STM32F4的库里的usbd_desc.c文件里没有配置描述符，但使用bus hound抓取的包里含有配置描述符，请问这个配置描述符在哪里？

USBD_DEVICE USR_desc =
{
  USBD_USR_DeviceDescriptor,
  USBD_USR_LangIDStrDescriptor,
  USBD_USR_ManufacturerStrDescriptor,
  USBD_USR_ProductStrDescriptor,
  USBD_USR_SerialStrDescriptor,
  USBD_USR_ConfigStrDescriptor,
  USBD_USR_InterfaceStrDescriptor,

};

摘自：usbd_desc.c

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拼命三郎回答时间：2015-3-8 17:00:27

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mantishell 回答时间：2015-3-8 17:37:12

感谢QQ朋友  深圳-任性-无钱的帮助找到了。

先是声明一个结构体
typedef struct _Device_cb{
  uint8_t  (*Init)       (void *pdev , uint8_t cfgidx);
  uint8_t  (*DeInit)    (void *pdev , uint8_t cfgidx);
/* Control Endpoints*/
  uint8_t  (*Setup)       (void *pdev , USB_SETUP_REQ  *req);
  uint8_t  (*EP0_TxSent) (void *pdev );
  uint8_t  (*EP0_RxReady)  (void *pdev );
  /* Class Specific Endpoints*/
  uint8_t  (*DataIn)    (void *pdev , uint8_t epnum);
  uint8_t  (*DataOut)    (void *pdev , uint8_t epnum);
  uint8_t  (*SOF)       (void *pdev);
  uint8_t  (*IsoINIncomplete)  (void *pdev);
  uint8_t  (*IsoOUTIncomplete)  (void *pdev);

  uint8_t  *(*GetConfigDescriptor)( uint8_t speed , uint16_t *length);
#ifdef USB_OTG_HS_CORE
  uint8_t  *(*GetOtherConfigDescriptor)( uint8_t speed , uint16_t *length);
#endif

#ifdef USB_SUPPORT_USER_STRING_DESC
  uint8_t  *(*GetUsrStrDescriptor)( uint8_t speed ,uint8_t index,  uint16_t *length);
#endif

} USBD_Class_cb_TypeDef;
然后是实例化的结构体
USBD_Class_cb_TypeDef  USBD_MSC_cb =
{
  USBD_MSC_Init,
  USBD_MSC_DeInit,
  USBD_MSC_Setup,
  NULL, /*EP0_TxSent*/
  NULL, /*EP0_RxReady*/
  USBD_MSC_DataIn,
  USBD_MSC_DataOut,
  NULL, /*SOF */
  NULL,
  NULL,
  USBD_MSC_GetCfgDesc,
#ifdef USB_OTG_HS_CORE
  USBD_MSC_GetOtherCfgDesc,
#endif
};
在这个实例化的结构体里的这个函数USBD_MSC_GetCfgDesc

uint8_t  *USBD_MSC_GetCfgDesc (uint8_t speed, uint16_t *length)
{
  *length = sizeof (USBD_MSC_CfgDesc);
  return USBD_MSC_CfgDesc;
}

追踪到最后在文件usbd_msc_core.c里找到了
__ALIGN_BEGIN uint8_t USBD_MSC_CfgDesc[USB_MSC_CONFIG_DESC_SIZ] __ALIGN_END =
{

  0x09, /* bLength: Configuation Descriptor size */
  USB_DESC_TYPE_CONFIGURATION, /* bDescriptorType: Configuration */
  USB_MSC_CONFIG_DESC_SIZ,

  0x00,
  0x01, /* bNumInterfaces: 1 interface */
  0x01, /* bConfigurationValue: */
  0x04, /* iConfiguration: */
  0xC0, /* bmAttributes: */
  0x32, /* MaxPower 100 mA */

  /********************  Mass Storage interface ********************/
  0x09, /* bLength: Interface Descriptor size */
  0x04, /* bDescriptorType: */
  0x00, /* bInterfaceNumber: Number of Interface */
  0x00, /* bAlternateSetting: Alternate setting */
  0x02, /* bNumEndpoints*/
  0x08, /* bInterfaceClass: MSC Class */
  0x06, /* bInterfaceSubClass : SCSI transparent*/
  0x50, /* nInterfaceProtocol */
  0x05,       /* iInterface: */
  /********************  Mass Storage Endpoints ********************/
  0x07, /*Endpoint descriptor length = 7*/
  0x05, /*Endpoint descriptor type */
  MSC_IN_EP, /*Endpoint address (IN, address 1) */
  0x02, /*Bulk endpoint type */
  LOBYTE(MSC_MAX_PACKET),
  HIBYTE(MSC_MAX_PACKET),
  0x00, /*Polling interval in milliseconds */

  0x07, /*Endpoint descriptor length = 7 */
  0x05, /*Endpoint descriptor type */
  MSC_OUT_EP, /*Endpoint address (OUT, address 1) */
  0x02, /*Bulk endpoint type */
  LOBYTE(MSC_MAX_PACKET),
  HIBYTE(MSC_MAX_PACKET),
  0x00    /*Polling interval in milliseconds*/
};

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