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发表于 2016-6-7 15:22:29
11#
在 windows 上用 usbview dump 出來的資訊:
呼喚大神! 懇請開示, 感恩^^
訊息如下
[Port3] : USB Composite Device
Device Power State: PowerDeviceD0
---===>Device Information<===---
English product name: "Linux USB Audio Gadget"
ConnectionStatus:
Current Config Value: 0x01 -> Device Bus Speed: High
Device Address: 0x02
Open Pipes: 0
*!*ERROR: No open pipes!
===>Device Descriptor<===
bLength: 0x12
bDescriptorType: 0x01
bcdUSB: 0x0200
bDeviceClass: 0x00 -> This is an Interface Class Defined Device
bDeviceSubClass: 0x00
bDeviceProtocol: 0x00
bMaxPacketSize0: 0x40 = (64) Bytes
idVendor: 0x1D6B = The Linux Foundation
idProduct: 0x0101
bcdDevice: 0x0310
iManufacturer: 0x01
English (United States) "Linux 3.10.0 with dwc_otg_pcd"
iProduct: 0x02
English (United States) "Linux USB Audio Gadget"
iSerialNumber: 0x00
bNumConfigurations: 0x01
---===>Full Configuration Descriptor<===---
===>Configuration Descriptor<===
bLength: 0x09
bDescriptorType: 0x02
wTotalLength: 0x006E -> Validated
bNumInterfaces: 0x02
bConfigurationValue: 0x01
iConfiguration: 0x00
bmAttributes: 0xC0 -> Self Powered
MaxPower: 0xFA = 500 mA
===>Interface Descriptor<===
bLength: 0x09
bDescriptorType: 0x04
bInterfaceNumber: 0x00
bAlternateSetting: 0x00
bNumEndpoints: 0x00
bInterfaceClass: 0x01 -> Audio Interface Class
bInterfaceSubClass: 0x01 -> Audio Control Interface SubClass
bInterfaceProtocol: 0x00
iInterface: 0x00
===>Audio Control Interface Header Descriptor<===
bLength: 0x0A
bDescriptorType: 0x24
bDescriptorSubtype: 0x01
bcdADC: 0x0100
wTotalLength: 0x0028
bInCollection: 0x02
baInterfaceNr[1]: 0x00
baInterfaceNr[2]: 0x01
===>Audio Control Input Terminal Descriptor<===
bLength: 0x0C
bDescriptorType: 0x24
bDescriptorSubtype: 0x02
bTerminalID: 0x01
wTerminalType: 0x0101 (USB streaming)
bAssocTerminal: 0x00
bNrChannels: 0x02
wChannelConfig: 0x0003
iChannelNames: 0x00
iTerminal: 0x00
===>Audio Control Output Terminal Descriptor<===
bLength: 0x09
bDescriptorType: 0x24
bDescriptorSubtype: 0x03
bTerminalID: 0x03
wTerminalType: 0x0301 (Speaker)
bAssocTerminal: 0x02
bSourceID: 0x02
iTerminal: 0x00
===>Audio Control Feature Unit Descriptor<===
bLength: 0x09
bDescriptorType: 0x24
bDescriptorSubtype: 0x06
bUnitID: 0x02
bSourceID: 0x01
bControlSize: 0x02
bmaControls[0]: 03 00
iFeature: 0x00
===>Interface Descriptor<===
bLength: 0x09
bDescriptorType: 0x04
bInterfaceNumber: 0x01
bAlternateSetting: 0x00
bNumEndpoints: 0x00
bInterfaceClass: 0x01 -> Audio Interface Class
bInterfaceSubClass: 0x02 -> Audio Streaming Interface SubClass
bInterfaceProtocol: 0x00
iInterface: 0x00
===>Interface Descriptor<===
bLength: 0x09
bDescriptorType: 0x04
bInterfaceNumber: 0x01
bAlternateSetting: 0x01
bNumEndpoints: 0x01
bInterfaceClass: 0x01 -> Audio Interface Class
bInterfaceSubClass: 0x02 -> Audio Streaming Interface SubClass
bInterfaceProtocol: 0x00
iInterface: 0x00
===>Audio Streaming Class Specific Interface Descriptor<===
bLength: 0x07
bDescriptorType: 0x24
bDescriptorSubtype: 0x01
bTerminalLink: 0x01
bDelay: 0x01
wFormatTag: 0x0001 (PCM)
===>Audio Streaming Format Type Descriptor<===
bLength: 0x0B
bDescriptorType: 0x24
bDescriptorSubtype: 0x02
bFormatType: 0x01
bNrChannels: 0x02
bSubframeSize: 0x02
bBitResolution: 0x10
bSamFreqType: 0x01
tSamFreq[1]: 0x00BB80 (48000 Hz)
===>Endpoint Descriptor<===
bLength: 0x09
bDescriptorType: 0x05
bEndpointAddress: 0x02 -> Direction: OUT - EndpointID: 2
bmAttributes: 0x09 -> Isochronous Transfer Type, Synchronization Type = Adaptive, Usage Type = Data Endpoint
wMaxPacketSize: 0x00C8 = 1 transactions per microframe, 0xC8 max bytes
wInterval: 0x0004
bSyncAddress: 0x00
===>Audio Streaming Class Specific Audio Data Endpoint Descriptor<===
bLength: 0x07
bDescriptorType: 0x25
bDescriptorSubtype: 0x01
bmAttributes: 0x01
bLockDelayUnits: 0x01
wLockDelay: 0x0001
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