举例一个高速USB音频设备的描述符
时间: 2024-04-17 16:24:28 浏览: 142
以下是一个高速USB音频设备的描述符示例:
设备描述符(Device Descriptor):
```
bLength: 18
bDescriptorType: 1 (USB_DEVICE_DESCRIPTOR_TYPE)
bcdUSB: 0x0200 (USB 2.0)
bDeviceClass: 0xEF (Miscellaneous Device Class)
bDeviceSubClass: 0x02
bDeviceProtocol: 0x01
bMaxPacketSize0: 64
idVendor: 0x1234
idProduct: 0x5678
bcdDevice: 0x0100
iManufacturer: 1 (String Descriptor Index)
iProduct: 2 (String Descriptor Index)
iSerialNumber: 0 (No Serial Number)
bNumConfigurations: 1
```
配置描述符(Configuration Descriptor):
```
bLength: 9
bDescriptorType: 2 (USB_CONFIGURATION_DESCRIPTOR_TYPE)
wTotalLength: 67
bNumInterfaces: 1
bConfigurationValue: 1
iConfiguration: 0 (No String Descriptor)
bmAttributes: 0xA0 (Bus Powered, Remote Wakeup)
bMaxPower: 100mA
```
接口描述符(Interface Descriptor):
```
bLength: 9
bDescriptorType: 4 (USB_INTERFACE_DESCRIPTOR_TYPE)
bInterfaceNumber: 0
bAlternateSetting: 0
bNumEndpoints: 2
bInterfaceClass: 1 (Audio Class)
bInterfaceSubClass: 1 (Audio Control Subclass)
bInterfaceProtocol: 0 (Unused Protocol)
iInterface: 0 (No String Descriptor)
```
音频控制接口描述符(Audio Control Interface Descriptor):
```
bLength: 9
bDescriptorType: 36 (Audio Interface Descriptor Type)
bDescriptorSubType: 1 (Audio Control Header)
bcdADC: 0x0100 (Audio Class 1.0)
wTotalLength: 9 (Total Length of this descriptor and all the sub-descriptors)
binCollection: 1 (Number of Audio Streaming Interfaces)
baInterfaceNr(1): 1 (Associated Audio Streaming Interface)
```
音频流接口描述符(Audio Streaming Interface Descriptor):
```
bLength: 7
bDescriptorType: 36 (Audio Interface Descriptor Type)
bDescriptorSubType: 2 (Audio Streaming General Subtype)
bTerminalLink: 2 (Terminal ID of the Output Terminal)
bDelay: 1 (Delay introduced by the data path)
wFormatTag: 1 (PCM Format)
```
这只是一个示例,实际的高速USB音频设备描述符可能更加复杂,涉及到更多的配置和接口信息。描述符中的具体数值会根据设备的功能和要求进行设置。以上示例描述了设备的基本信息、配置、接口、音频控制和音频流相关的描述符。
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