USB各描述符的定义怎么表示？

USB各描述符的定义，在C语言中，实际上用简单的数组就可以表示，如下：

uint8_t XXX_DeviceDescriptor[JOYSTICK_SIZ_DEVICE_DESC] =
{

0x12, /* bLength: Size of this descriptor in bytes*/

USB_DEVICE_DESCRIPTOR_TYPE, 			/*bDescriptorType*/

0x00,                       /*bcdUSB : USB Specification Release Number*/
0x02,

0x00,                       /*bDeviceClass: zero, each interface within a configuration specifies its own
				class information and the various interfaces operate independently*/
				
0x00,                       /*bDeviceSubClass*/

0x00,                       /*bDeviceProtocol*/

0x40,                       /*bMaxPacketSize 64:Maximum packet size for endpoint zero*/

0xXX,                       /* idVendor */
0xXX,

0x05,                       /*idProduct*/
0x00,

0x00,                       /*bcdDevice rel. 2.00:Device release number*/
0x02,

IndexStringDescriptor_Manufacturer,                          /*Index of string descriptor describing manufacturer */

IndexStringDescriptor_Product,                          /*Index of string descriptor describing product*/

IndexStringDescriptor_DeviceSerialNumber,                          /*Index of string descriptor describing the device's serial number */

0x01                        /*bNumConfigurations:  Number of possible configurations*/

};
uint8_t XXX_ConfigurationDescriptor[JOYSTICK_SIZ_CONFIG_DESC] =
{
0x09, /* bLength: Configuration Descriptor size */

USB_CONFIGURATION_DESCRIPTOR_TYPE, 	/* bDescriptorType: CONFIGURATION Descriptor Type */

JOYSTICK_SIZ_CONFIG_DESC,				/* wTotalLength: Bytes returned. : Total length of data returned for this*/
0x00,									// configuration. Includes the combined length of all descriptors (configuration, interface,
									// endpoint, and class- or vendor-specific) returned for this configuration.     

0x01,        	 /*bNumInterfaces: 1 interface: Number of interfaces supported by this configuration*/

0x01,         /*bConfigurationValue: Configuration value:Value to use as an argument to the
							SetConfiguration() request to select this configuration*/
							
0x00,         /*iConfiguration: Index of string descriptor describing the configuration*/

0xE0,         /*bmAttributes: Self powered
			D6: Self-powered.
			D5: Remote Wakeup.*/

0x32,         /*MaxPower 100 mA: this current is used for detecting Vbus*/

/************** Descriptor of Joystick Mouse interface ****************/
/* 09 */
0x09,         /*bLength: Size of this descriptor in bytes*/

USB_INTERFACE_DESCRIPTOR_TYPE,/*bDescriptorType: Interface descriptor type*/

0x00,         /*bInterfaceNumber:  Number of this interface. Zero-based
		value identifying the index in the array of concurrent interfaces supported by this configuration*/
		
0x00,         /*bAlternateSetting: Value used to select this alternate setting
		for the interface identified in the prior field*/

0x01,         /*bNumEndpoints: Number of endpoints used by this interface (excluding endpoint zero). If this
		value is zero, this interface only uses the Default Control Pipe*/
		
0x03,         /*bInterfaceClass: HID. : Class code (assigned by the USB-IF).*/

0x01,         /*bInterfaceSubClass : 1=BOOT, 0=no boot.:Subclass code (assigned by the USB-IF).*/

0x02,         /*nInterfaceProtocol : 0=none, 1=keyboard, 2=mouse.: Protocol code (assigned by the USB)*/

IndexStringDescriptor_Interface,            /*iInterface: Index of string descriptor describing this interface*/
/******************** Descriptor of Joystick Mouse HID ********************/
/* 18 */
0x09,         /*bLength: HID Descriptor size*/

HID_DESCRIPTOR_TYPE, /*bDescriptorType: HID*/

0x00,         /*bcdHID: HID Class Spec release number*/
0x01,

0x00,         /*bCountryCode: Hardware target country*/

0x01,         /*bNumDescriptors: Number of HID class descriptors to follow*/

0x22,         /*bDescriptorType: type of next descriptor, 0x22 is for report descriptor.*/

JOYSTICK_SIZ_REPORT_DESC,/*wItemLength: Total length of Report descriptor*/
0x00,
/******************** Descriptor of Joystick Mouse endpoint ********************/
/* 27 */
0x07,          /*bLength: Size of this descriptor in bytes*/

USB_ENDPOINT_DESCRIPTOR_TYPE, /* ENDPOINT Descriptor Type*/

0x81,          /*bEndpointAddress: Endpoint Address (IN).
			Bit 3...0: The endpoint number
		Bit 6...4: Reserved, reset to zero
		Bit 7: Direction, ignored for control endpoints.
			 0 = OUT endpoint
			 1 = IN endpoint*/
			 
0x03,          /*bmAttributes: Interrupt endpoint.
			 This field describes the endpoint’s attributes when it is configured using the bConfigurationValue.
			Bits 1..0: Transfer Type
				 00 = Control
				 01 = Isochronous
				 10 = Bulk
				 11 = Interrupt	---set
		If not an isochronous endpoint, bits 5..2 are reserved and must be set to zero. If isochronous, they are
		defined as follows:...*/
		
0x04,          /*wMaxPacketSize: 4 Byte max. :Maximum packet size this endpoint is capable of*/
0x00,		 // sending or receiving when this configuration is selected. 
		
0x20,          /*bInterval: Polling Interval (32 ms). :Interval for polling endpoint for data transfers*/
/* 34 */

};