USB-2-0与UVC-1-1-在Webcam-F-W传输设定(共57页)

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1、精选优质文档-倾情为你奉上題目: USB 2.0 與UVC 1.1 在Webcam F/W傳輸設定尚立Webcam 高級工程師 Aladdin前言: Webcam使用 USB Video Class 1.1 以及使用USB 2.0 的通訊協定將Webcam 的影像資料傳輸到PC 或NB, 如果有支援聲音則使用USB Audio Class 1.0 的協定內容: Webcam可以從程式設定了解USB 協定(1) 設定Standard Device主要設定USB 2.0 High Speed 的Standard Device Descriptor, 定義在USB2.0 Spec. Table 9.

2、8設定USB 版本, 產品的VID, PID, Serial Number .等0x00, 0x12,/ length of device decriptor/ Device Descriptor0x12,/ bLength: 0x12 byte 0x01, / bDescriptorType: DEVICE 0x00, 0x02, / bcdUSB: version 2.00 0xEF, / bDeviceClass: independent interfaces 0x02, / bDeviceSubClass: 2 0x01, / bDeviceProtocol: class specif

3、ic protocols NOT used on device basis0x40, / bMaxPacketSize0: maximum packet size for endpoint zero 0xF2, 0x04, / idVendor: vendor ID 0xC3, 0xB2, / idProduct: product ID 0x27, 0x11, / bcdDevice: device release number in BCD 0x01, / iManufacturer: index of string 0x02, / iProduct: index of string 0x0

4、0, / iSerialNumber: index of string 0x01, / bNumConfigurations: 1 configuration 解釋Offset 0 - bLength: 為這個Descriptor 的長度為18 Bytes, 占1 Byte, 設定為0x12Offset 1 -bDescriptorType, 這個Descriptor type, 占1 Byte, 為0x01Offset 2-bcdUSB, USB通訊的版本, 占2個Bytes, 由於是支援USB2.0 , 所以要設定 0x00, 0x02(傳輸先傳低位元組再傳高位元組)Offset 4 -b

5、DeviceClass, USB_IF 對這Device Class的編碼, 0xEFOffset 5 -bDeviceSubClass, USB_IF對這Device sub Class 編碼, 0x02Offset 6 -bDeviceProtocol, USB_IF 對這 Device Protocol 編碼, 0x01Offset 7 -bMaxPacketSize, 傳輸最大數據包的Size, 只可以定義8, 16, 32, 64, 這裡定義為64 Bytes,為0x40 Offset 8 - idVendor, 為產品的VID根據USB-IF 定義, 占2bytes,0xF2,0x

6、40Offset10-idProduct, 定義產品的PID, 占2bytes, 0xC3, 0xB2Offset12- bcdDevice, 可定義產品的版本, 占2bytes, 0x27,0x11Offset14- iManufacturer, 製造廠商, 利用index 選擇Strings, 0x01Offset15 - iProduct, 產品名稱,利用index 選擇Strings,0x02Offset16- iSerialNumber, 序號, 利用index 選擇Strings,0x00Offset 17- bNumConfigurations, 結構的編號, 使用Configu

7、ration 1, 0x01這個Device descriptor 傳輸到NB 或PC, 在Windows 的系統的硬體識別碼顯示VID, PID,與Rev(2) 其他速率傳輸設定Device_Qualifier Descriptor,設定非High Speed USB Device Descriptor , 如Webcam 也有支援Full Speed 傳輸, 定義在USB Spec. Table 9.9F/W 設定為0x00, 0x0A,/ length of device qualifier descriptor/ Device Qualifier Descriptor0x0A, / b

8、Length: 0x0A byte 0x06, / bDescriptorType: DEVICE QUALIFIER 0x00, 0x02, / bcdUSB: version 2.00 0xEF, / bDeviceClass: independent interfaces 0x02, / bDeviceSubClass: 2 0x01, / bDeviceProtocol: class specific protocols NOT used on device basis 0x40, / bMaxPacketSize0: maximum packet size for endpoint

9、zero 0x01, / bNumConfigurations: 1 configuration 0x00, / bReserved: 0x00 解釋Offset0, 為bLength, 這Device Qualifier 為10bytes, 0x0AOffset1, 為bDescriptorType, 設定為0x06Offset2, 為bcdUSB, USB通訊的版本, 占2個Bytes, 由於是USB2.0 , 所以要設定 0x00, 0x02Offset 4, 為bDeviceClass, USB-IF 對這Device 的class 編碼, 0xEFOffset5, 為bDeviceS

10、ubClass, USB-IF 對這Device 的subclass 編碼, 0x0x02Offset6 , 為bDeviceProtocol, USB-IF 對這Device 的protocol編碼, 0x0x01Offset 7 -bMaxPacketSize, 傳輸最大數據包的Size, 只可以定義8, 16, 32, 64, 這裡定義為64,為0x40 Offset8- bNumConfigurations, 結構的編號, 使用Configuration 1, 0x01Offset9- bReserved, 保留,需設定0x00(3)顯示語言編碼顯示Webcam字串的語言編碼, 定義在

11、USB 2.0 Spec. Table 9.15F/W設定0x00, 0x04, / length of language id string descriptor/ Language ID String Descriptor0x04,/ bLength 0x03, / bDescriptorType: STRING 0x09, 0x04, / bString: English (US)解釋Offset0 為bLength, 因指定義一種語言所以為0x04Offset1 為bbDescriptorType, String 的Descriptor 為0x03Offset2 為wLANGID0,

12、占2bytes,英文編碼為0x09,0x04 參考USB Language 編碼(4)產品名稱編碼Webcam 的產品名稱, 定義在USB 2.0 Spec. Table 9.16F/W 設定0x00,0x32,/length of product string descriptor0x32,/Product String Descriptor0x03,/bLength0x53,0x00,0x50,0x00,0x43,0x00,0x41,0x00,0x32,0x00,0x32,0x00,0x38,0x00,0x31,0x00,0x20,0x00,0x57,0x00,/W0x65,0x00,/e

13、0x62,0x00,/b0x20,0x00,/ 0x43,0x00,/C0x61,0x00,/a0x6D,0x00,/m0x65,0x00,/e0x72,0x00,/r0x61,0x00,/a0x20,0x00,0x20,0x00,0x20,0x00,0x20,0x00,解釋Offset0 為bLength, 更具字串+2 來定義LengthOffset1 為 bDescriptorType, 設定字串的Descriptor 為0x03Offset2OffsetN 設定字串編碼, 使用Unicode 碼, 每個字為2Bytes這個Strings descriptor 傳輸到NB 或PC, 在顯

14、示名稱會秀出如USB Camera 2. 傳輸設定: 主要設定USB 2.0 的Configuration 及UVC 1.1 的定義處理如feature, resolution.等等可分為Full Speed USB 定義及High Speed USB 定義, 兩者的Descriptor 類似只是參數設定不同,(1) USB ConfigurationF/W 編碼/ Configuration Descriptor0x09, / bLength: 0x09 byte0x02, / bDescriptorType: CONFIGURATION0x81, 0x05, / wTotalLength:

15、 0x062d byte0x04, / bNumInterfaces: 2 interfaces0x01, / bConfigurationValue: configuration 10x00, / iConfiguration: index of string0x80, / bmAttributes: bus powered0xFA, / MaxPower: 500 mA這定義USB2.0 傳送UVC 及UAC 的型態, 規範在USB 2.0 Spec. Table 9.10解釋Offset0 為bLength, Configuration Descriptor 的長度為9 bytes, 0

16、x09Offset1 為bDescriptorType, Configuration Descriptor type, 0x02Offset2 為wTotalLength, 占2bytes 為傳送USB 2.0 的UVC 或UAC 定義資料的全部長度, 包括Configuration Descriptor, 0x81,0x05(0x581 bytes)Offset4 為bNumInterfaces, Interface number, SPCA2281 有Audio 所以設定0x04, 如沒有Audio 設定0x02Offset5 為bConfigurationValue, 為設定結構值, 定

17、義0x01Offset6 為iConfiguration, 為設定這結構的描述字串指標, 0x00Offset7 為bmAttributes, 為設定bus 的power 狀況, D7 為reserved 必須設定為1, D6 為是否要Self Power, D5為遠端遙控開機功能, D4D0為reserved 設為0, 所以為0x80Offset8 為bMaxPower, 設定USB bus最大電流, 每單為為2mA, 所以0xfa=250即為500mA(2)Video Interface Association Descriptor USB 在Video 介面接口關連描述(IAD)定義在U

18、VC1.1 Spec. Table 3-1F/W 設定 / Video Interface Association Descriptor0x08, / bLength: 0x08 byte0x0B, / bDescriptorType: INTERFACE ASSOCATION Descriptor0x00, / bInterfaceNumber: interface 00x02, / bInterfaceCount: 20x0E, / bFunctionClass: 0x0E0x03, / bFunctionSubClass: 0x030x00, / bInterfaceProtocol:

19、class specific protocol NOT used on this interface0x02, / iFunction: 2解釋Offset0 為bLength, IAD長度為8bytes, 0x08Offset1 bDescriptorType , Interface Association descriptor type, Value=11,0x0BDescriptor Types 編號Offset2 為bFirstInterface 為第一個Video control number, 設定0x00Offset3 為bInterfaceCount 為鄰近的interface

20、 總數,設定0x02(Webcam, NB or PC)Offset4 為bFunctionClass, Video Interface Class code 的CC_VIDEO ,0x0EOffset5 為bFunctionSubClass, 設定 SC_VIDEO_INTERFACE_COLLECTION , 0x03Offset6 為bFunctionProtocol ,必須設為PC_PROTOCOL_UNDEFINED,0x00Offset7 為 iFunction , 這界面字串的指標,0x02(3) Standard VC Interface Descriptor 設定基本Vide

21、o Control 介面的Descriptor, 定義UVC1.1 Spec Table 3-2F/W 設定 / VideoControl Interface Descriptor0x09, / bLength: 0x09 byte0x04, / bDescriptorType: INTERFACE0x00, / bInterfaceNumber: interface 00x00, / bAlternateSetting: alternate setting 00x01, / bNumEndpoints: 1 endpoint0x0E, / bInterfaceClass: 0x0E0x01,

22、 / bInterfaceSubClass: 0x010x00, / bInterfaceProtocol: class specific protocol NOT used on this interface0x02, / iInterface: index of string解釋Offset0 為bLength , 這VC interface Descriptor 固定長度為9Bytes, 0x09Offset1 為bDescriptorType, 介面 Descriptor type, 0x04 Offset2 為bInterfaceNumber, 介面數, 設定為0Offset3 為

23、bAlternateSetting , 間隔數的設定, 設為0間隔, 0x00Offset4 為 bNumEndpoints , 端點的設定,需設為1, 0x01Offset5 為 bInterfaceClass , 設定為CC_VIDEO, 0x0EOffset6 為 bInterfaceSubClass , 設定SC_VIDEOCONTROL,0x01Offset7 為 bInterfaceProtocol , 沒使用必須設PC_PROTOCOL_UNDEFINED ,0x00Offset8 為 iInterface, 介面descriptor 描述字串指標, 設定0x02(4) Clas

24、s-specific VC Interface Header Descriptor主要是設定Class-specific 的total length 及Device clock Frequency, 參考UVC Spec Table 3-3 F/W 設定 / Class-specific VideoControl Interface Header Descriptor0x0D, / bLength: 0x0D byte0x24, / bDescriptorType: 0x240x01, / bDescriptorSubType: VC_HEADER subtype0x00, 0x01, / b

25、cdVDC: Revision of class specification that this device is based upon0x50, 0x00, / wTotalLength: Total size of class-specific descriptors0x00, 0x6C, 0xDC, 0x02, / dwClockFrequency: 48MHz0x01, / bInCollection: Number of streaming interfaces0x01, / baInterfaceNr(1): Interface number of the first Video

26、Streaming interface解釋Offset0 為bLength, 基本Length為12, 另外增加1Byte 的interface number, 為13, 0x0DOffset1 為bDescriptorType , 設定CS_INTERFACE, 為0x24 Offset2 為bDescriptorSubType , 要設VC_Header, 0x01Offset3為 bcdUVC, 定義Video Device Class Specification release number, 占2bytes, 0x00, 0x01Offset5為wTotalLength, 定義 cl

27、ass-specific VideoControl interface descriptor的全部長度,占2bytes, 為0x50, 0x00Offset7 為dwClockFrequency , 裝置的clock Frequency, 為48MHz-02DC6C00, 占4bytes, 0x00,0x6C,0xDC,0x02Offset11 為bInCollection ,為VideoStreaming number, 設定0x01Offset12 為 baInterfaceNr(1), 為第一個VideoStreaming 有多少interface, 為0x01(5) Input (Ca

28、mera)Terminal Descriptor設定VideoControl Camera Input Terminal Descriptor, 參考UVC Spec Table 3-6F/W 設定 / VideoControl Camera Terminal Descriptor0x12, / bLength: 0x12 byte0x24, / bDescriptorType: 0x240x02, / bDescriptorSubType: VC_INPUT_TERMINAL subtype0x01, / bTerminalID: ID of this input terminal0x01,

29、 0x02, / wTerminalType: ITT_CAMERA type.0x00, / bAssocTerminal: No assocation0x00, / iTerminal: Unused0x00, 0x00, / wObjectiveFocalLengthMin: No optional zoom supported0x00, 0x00, / wObjectiveFocalLengthMax: No optional zoom supported0x00, 0x00, / wOcularFocalLength: No optional zoom supported0x03,

30、/ bControlSize: The size of the bmControls is 2 bytes0x0A, 0x00, 0x00, / bmControls: Camera Terminal controls are supported解釋:Offset0 為bLength , 設定0x12Offset1 為bDescriptorType, 設定 CS_INTERFACE , 0x24Offset2 為bDescriptorSubtype, 設定 VC_INPUT_TERMINAL, 0x02 Offset3 為bTerminalID , 為Input terminal ID, 0x

31、01Offset4 為wTerminalType, 占2bytes, Input Terminal type為Camera,0x01, 0x02Offset6 為 bAssocTerminal , no such association exists 設0, 0x00Offset7 為iTerminal, input Terminal String 指標, 0x00Offset8 為wObjectiveFocalLengthMin , The value of Lmin , 因SPCA2281 沒Support control Focal 設0x00, 0x00Offset10 為wObjec

32、tiveFocalLengthMax, The value of Lmax ,設0x00, 0x00Offset12 為wOcularFocalLength , The value of Locular ,設0x00, 0x00Optical Zoom公式為Offset14 為bControlSize, 為Camera Control bmControls Size, 0x03Offset15 為 bmControls , Camera Unit control, 設定為0x0A,0x00,0x00 占3bytes 表示0000,0000,0000,0000,0000,1010- suppor

33、t D3 Exposure Time (Absolute), D1 Auto-Exposure Mode (6) Processing Unit Descriptor 主要設定Support video stream 及 analog Video standard 參考UVC Spec. Table 3-8F/W 設定 / VideoControl Processing Unit Descriptor0x0B, / bLength: 0x0B byte0x24, / bDescriptorType: 0x240x05, / bDescriptorSubtype: VC_PROCESSING_U

34、NIT0x02, / bUnitID: ID of this unit0x01, / bSourceID: This input pin of this unit is connected to the output pin of unit with ID 0x010x00, 0x40, / wMaxMultiplier: Maximum digital magnification (4X).0x02, / bControlSize: Size in bytes of the bmControls field0x7F, 0x15, / bmControls: Processing Unit c

35、ontrols supported.0x00, / iProcessing: Unused解釋Offset0 為bLength , 0x0BOffset1 為bDescriptorType , 設定CS_INTERFACE, 0x24Offset2 為bDescriptorSubtype , 設定VC_PROCESSING_UNIT,0x05 Offset3 為bUnitID, Uini ID, 0x02 Offset4 為bSourceID , Source ID, 輸入為camera 為0x01Offset5 為wMaxMultiplier, Max Digital Multiplier

36、為4x, 0x00, 0x40Offset7 為bControlSize, bmControls size, 0x02Offset8 為bmControls, 設定0x7F, 0x17, 占2bytes, 為0001,0111,0111,1111 表示Support White Balance Temperature( Auto), Power Line Frequency, Gain, Backlight Compensation , White Balance Temperature, Gamma, Sharpness, Hue, Contrast, Brightness Offset10

37、 為iProcessing , Index of a string descriptor,設0x00(7) Extension Unit Descriptor 延伸資料的Descriptor, 可以將製造商資料(SunplusIT) 或是客戶(Dell) 放入16bytes 的Extension unit中, 參考UVC Spec. Table 3-9F/W 設定0x1D, / bLength: 0x1D byte0x24, / bDescriptorType: 0x240x06, / bDescriptorSubtype: VC_EXTENSION_UNIT0x03, / bUnitID:

38、ID of this unit0x99, 0x1D, 0x5A, 0x7D,/ guidFormat: Globally Unique Identifier for Sunplus Extension Unit. */0x32, 0x5B,0x8B, 0x42,0x8C, 0xAD,0x67, 0x1B,0x8A, 0x65, 0xF3, 0x7A,0x00, / bNumControls0x01, / bNrInPins0x02, / bSourceID0x04, / bControlSize0xFF, 0xFF, 0x19,0x00,/ bmControls0x00, / Unused (

39、8) Output Terminal Descriptor 參考UVC SPEC. Table3-5 F/W 設定 / VideoControl Output Terminal Descriptor0x09, / bLength: 0x09 byte0x24, / bDescriptorType: 0x240x03, / bDescriptorSubtype: VC_OUTPUT_TERMINAL.0x04, / bTerminalID: ID of this terminal.0x01, 0x01, / wTerminalType: TT_STREAMING type. This termi

40、nal is a USB streaming terminal.0x00, / bAssocTerminal: No association.0x04, / bSourceID: The input pin of this unit is connected to the output pin of unit 3.0x00, / iTerminal: Unused解釋Offset0, 為bLength , 為9bytes, 0x09Offset1 為bDescriptorType , 設定CS_INTERFACE , 0x24Offset2 為bDescriptorSubtype, 設定VC_

41、OUTPUT_TERMINAL, 0x03Offset3 為 bTerminalID , 為Terminal ID, 0x04Offset4 為wTerminalType, Terminal type TT_STREAMING, 0x01,0x01 Offset6 為bAssocTerminal, 由於沒有Association, 設為0x00Offset7 為 bSourceID , Source ID , 0x01Offset8 為iTerminal , Index of a string descriptor, 0x00(9) Video Control Interrupt Endpoi

42、nt Descriptor設定中斷端點的Descriptor參考 UVC SPEC. Table 3-10F/W 設定0x07, / bLength: 0x07 byte0x05, / bDescriptorType: ENDPOINT0x87, / bEndpointAddress: IN endpoint 7.0x03, / bmAttributes: Interrupt transfer type.0x10, 0x00, / wMaxPacketSize: 16-byte status packet.0x08, / bInterval: polling interval is 2(8-1

43、) * 125 us = 16 ms解釋Offset0 為bLength, Descriptor 長度, 0x07Offset1 為bDescriptorType , Offset2 為bEndpointAddress , Endpoint Address, D7=1 為In endpoint, number endpoint = 7, 0x87Offset3 為bmAttributes , Must be set to 11 (Interrupt), 為0x03Offset4 為wMaxPacketSize , Max Packet Size 為16bytes, 占2bytes, 0x10,

44、0x00Offset6 為bInterval , interrupt endpoint polling 時間-16ms, 公式:2(n-1) * 125 us=16ms, n=8(10) Class-specific Video Control Interrupt Endpoint Descriptor參考UVC SPEC. Table 3-11F/W設定0x05, / bLength: 0x05 byte0x25, / bDescriptorType: CS_ENDPOINT descriptor.0x03, / bDescriptorSubType: EP_INTERRUPT.0x10,

45、0x00, / wMaxTransferSize: 16-byte status packet.解釋Offset0, 為bLength, 0x05Offset1 為bDescriptorType, 設定 CS_ENDPOINT, 0x25 Offset2 為bDescriptorSubType ,設定EP_INTERRUPT, 0x03 Offset3 為wMaxTransferSize, Maximum interrupt structure size 為16 bytes, 0x10, 0x00Video Control descriptor 已設定完畢, 接下來要設定Video Strea

46、ming descriptor(11) Video Streaming Interface Descriptor參考UVC SPEC. Table 3-12F/W 設定 / VideoStreaming Interface Descriptor0x09, / bLength: 0x09 byte0x04, / bDescriptorType: INTERFACE0x01, / bInterfaceNumber: interface 10x00, / bAlternateSetting: alternate setting 00x00, / bNumEndpoints: 0 endpoint0x

47、0E, / bInterfaceClass: 0x0E0x02, / bInterfaceSubClass: 0x02.0x00, / bInterfaceProtocol: PC_PROTOCOL_UNDEFINED.0x00, / iInterface: Unused解釋Offset0 為bLength , Descriptor Length 為0x09Offset1 為bDescriptorType, 設定Interface, 0x04 Offset2 為bInterfaceNumber , Interface number, 0x01Offset3 為bAlternateSetting

48、, Alternate Setting, 0x00Offset4 為 bNumEndpoints, excluding endpoint 0, 0x00Offset5 為bInterfaceClass, 設為CC_Video, 0x0EOffset6 為bInterfaceSubClass, 設為 SC_VIDEOSTREAMING ,0x02Offset7 為bInterfaceProtocol ,設定為PC_PROTOCOL_UNDEFINED, 0x00Offset8 為 iInterface, Index of a string descriptor,0x00(12) Video St

49、reaming Input Header Descriptor參考UVC SPEC. Table 3-13 F/W 設定 / VideoStreaming Input Header Descriptor0x0F, / bLength: 0x0F byte0x24, / bDescriptorType: 0x24.0x01, / bDescriptorSubtype: VS_INPUT_HEADER.0x02, / bNumFormats: VC_NUMBER_OF_FORMAT.0x12, 0x04, / wTotalLength: Total size of class-specific V

50、ideoStreaming interface descriptors.0x81, / bEndpointAddress: Address of the isochronous endpoint used for video data.0x00, / bmInfo: Dynamic format change doesnt supported.0x04, / bTerminalLink: This VideoStreaming interface supplies terminal ID 5 (Output Terminal).0x02, / bStillCaptureMethod: Devi

51、ce supports still image capture method 2.0x01, / bTriggerSupport: Hardware trigger supported for still image capture.0x00, / bTriggerUsage: Hardware trigger should initiate a still image capture.0x01, / bControlSize: Size of the bmaControls field.0x00, / BmaControls(1): no videoStreaming specific controls is supported.0x04, / BmaControls(2): Compression quality videoStreaming specific controls is supported.解釋Offset0 為bLength, Descriptor length, 0x0fOffset1 為bDescriptorType, 設定 CS_INTERFACE, 0x24