USB CDC配置描述符内容、顺序是固定的？？？？

NUAA-DW · 发表于 2016-6-6 19:37:06

[mw_shl_code=c,true]const uint8_t Virtual_Com_Port_ConfigDescriptor[] =
  {
/*Configuration Descriptor*/
0x09, /* bLength: Configuration Descriptor size */
USB_CONFIGURATION_DESCRIPTOR_TYPE,    /* bDescriptorType: Configuration */
VIRTUAL_COM_PORT_SIZ_CONFIG_DESC,    /* wTotalLength:no of returned bytes */
0x00,
0x02, /* bNumInterfaces: 2 interface */
0x01, /* bConfigurationValue: Configuration value */
0x00, /* iConfiguration: Index of string descriptor describing the configuration */
0xC0, /* bmAttributes: self powered */
0x32, /* MaxPower 0 mA */
/*Interface Descriptor*/
0x09, /* bLength: Interface Descriptor size */
USB_INTERFACE_DESCRIPTOR_TYPE,  /* bDescriptorType: Interface */
/* Interface descriptor type */
0x00, /* bInterfaceNumber: Number of Interface */
0x00, /* bAlternateSetting: Alternate setting */
0x01, /* bNumEndpoints: One endpoints used */
0xff, /* bInterfaceClass: Communication Interface Class */
0x00, /* bInterfaceSubClass: Abstract Control Model */
0x00, /* bInterfaceProtocol: Common AT commands */
0x00, /* iInterface: */
/*Header Functional Descriptor*/
0x05, /* bLength: Endpoint Descriptor size */
0x24, /* bDescriptorType: CS_INTERFACE */
0x00, /* bDescriptorSubtype: Header Func Desc */
0x10, /* bcdCDC: spec release number */
0x01,
/*Call Management Functional Descriptor*/
0x05, /* bFunctionLength */
0x24, /* bDescriptorType: CS_INTERFACE */
0x01, /* bDescriptorSubtype: Call Management Func Desc */
0x00, /* bmCapabilities: D0+D1 */
0x01, /* bDataInterface: 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 */
0x00, /* bMasterInterface: Communication class interface */
0x01, /* bSlaveInterface0: Data Class Interface */

/*Endpoint 2 Descriptor*/
0x07, /* bLength: Endpoint Descriptor size */
USB_ENDPOINT_DESCRIPTOR_TYPE, /* bDescriptorType: Endpoint */
0x81, /* bEndpointAddress: (IN2) */
0x02, /* bmAttributes: Interrupt */
VIRTUAL_COM_PORT_INT_SIZE,    /* wMaxPacketSize: */
0x00,
0xFF, /* bInterval: */

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

/*Endpoint 3 Descriptor*/
0x07, /* bLength: Endpoint Descriptor size */
USB_ENDPOINT_DESCRIPTOR_TYPE, /* bDescriptorType: Endpoint */
0x03, /* bEndpointAddress: (OUT3) */
0x02, /* bmAttributes: Bulk */
VIRTUAL_COM_PORT_DATA_SIZE,          /* wMaxPacketSize: */
0x00,
0x00, /* bInterval: ignore for Bulk transfer */
  };[/mw_shl_code]如上是根据虚拟串口改的自定义配置描述符，比如我把端点3和端点1配置移到端点2下面，就不行，删除端点2也不行，CDC类的配置描述格式是固定的吗？