STM32 定义两个BULK端点, 为什么只能传输64字节?

只看该作者 · 2013-4-19 11:17

自定义一个BULK传输的usb设备.IN端点 0X82  ,OUT端点0X03
设备可以正常枚举,安装驱动,但是想IN端点发送数据时只能发送64字节,小于64字节不成功(PC机上用BUSHOUND看不到数据包)
高手帮忙看看是什么原因??

设备描述符:
0x12,                      /*bLength */
USB_DEVICE_DESCRIPTOR_TYPE, /*bDescriptorType*/
LOBYTE(0x0200),                      /*bcdUSB 2.0*/
HIBYTE(0x0200),
0xff,                      /*bDeviceClass*/
0x00,                      /*bDeviceSubClass*/
0x00,                      /*bDeviceProtocol*/
USB_OTG_MAX_EP0_SIZE,    /*bMaxPacketSize*/
LOBYTE(USBD_VID),          /*idVendor*/
HIBYTE(USBD_VID),          /*idVendor*/
LOBYTE(USBD_PID),          /*idVendor*/
HIBYTE(USBD_PID),          /*idVendor*/
0x00,                      /*bcdDevice rel. 2.00*/
0x02,
0, //USBD_IDX_MFC_STR,          /*Index of manufacturer  string*/
0,  //USBD_IDX_PRODUCT_STR,    /*Index of product string*/
0,  //USBD_IDX_SERIAL_STR,       /*Index of serial number string*/
USBD_CFG_MAX_NUM          /*bNumConfigurations*/

配置描述符,端点描述符:
/*Configuration Descriptor*/
  0x09, /* bLength: Configuration Descriptor size */
  USB_CONFIGURATION_DESCRIPTOR_TYPE,    /* bDescriptorType: Configuration */
  USB_CDC_CONFIG_DESC_SIZ,             /* wTotalLength:no of returned bytes */
  0x00,
  0x01, /* bNumInterfaces: 1 interface */
  0x01, /* bConfigurationValue: Configuration value */
  0x00, /* iConfiguration: Index of string descriptor describing the configuration */
  0xC0, /* bmAttributes: self powered */
  250, /* MaxPower 2 mA */

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

  //18

  /*Endpoint OUT Descriptor*/
  0x07, /* bLength: Endpoint Descriptor size */
  USB_ENDPOINT_DESCRIPTOR_TYPE,    /* bDescriptorType: Endpoint */
  VL8461_OUT_EP,                      /* bEndpointAddress */
  0x02,                            /* bmAttributes: Bulk */
  LOBYTE(CDC_DATA_MAX_PACKET_SIZE),  /* wMaxPacketSize: */
  HIBYTE(CDC_DATA_MAX_PACKET_SIZE),
  0,                            /* bInterval: ignore for Bulk transfer */
  //25
  /*Endpoint IN Descriptor*/
  0x07, /* bLength: Endpoint Descriptor size */
  USB_ENDPOINT_DESCRIPTOR_TYPE,    /* bDescriptorType: Endpoint */
  VL8461_IN_EP,                      /* bEndpointAddress */
  0x02,                            /* bmAttributes: Bulk */
  LOBYTE(CDC_DATA_MAX_PACKET_SIZE),  /* wMaxPacketSize: */
  HIBYTE(CDC_DATA_MAX_PACKET_SIZE),
  0                            /* bInterval: ignore for Bulk transfer */
  //32