參考-usb初級(jí)培訓(xùn)cdc demo講解

CDCDemo 第一部分CDC類基礎(chǔ)知識(shí)介 USB2.0標(biāo)UniversalSerialBusSpecificationRevision2.0

UniversalSerialBusClassDefinitionsfor

PSTN og)ISDNEthernetnetworkingATMnetworkingBroadbandmodems:Modems,DSLWirelessMobileCommunicationsdevicesWirelessnetworkingEthernetEmulationUniversalSerialBusCommunicationsClassSubclassSpecificationfor 虛擬串口操作(可選

詳情點(diǎn)擊CDC類的配置描述 ConfigurationConfigurationInterfaceInterface(Comm.ClassInterfaceInterfacelassComm.Class InterfaceInterface9001CommunicationsCDCControlControlATCommands:etcNoneCallendpoint0:endpointx(0x82): lass Interface9Interface9102CDCDataUnknownNoclassspecificprotocolrequiredNoneDataIn(0x81)DataOut(0x01)Functional HeaderFunctional5HeaderDescriptor1.10Functional ACMFunctionalACMFunctional4Management

ControlModel)，還有DLM(DirectLineMode),TCM( ControlModel). CallManagementCallManagementFunctional5CS_INTERFACECallManagementFunctionalDescriptorDoesnothandlecallmanagementCallManagementoverCommClassinterface(0b0)1 Functional UnionFunctional5UnionDescriptorUnionFunctional5UnionDescriptor01一個(gè)具體的CDC類配置描述 8ON08ON02CommunicationsandCDCControl(0x02)ControlNoclassspecificrequiredNone Class,SubClass,例如bDeviceClass:Miscellaneous(0xef);bDeviceSubClass:Common(0x02);bDeviceProtocol:InterfaceAssociationDescriptor(0x01)，此時(shí)，一個(gè)具體的IAD例 ement IssuesacommandintheformatofthesupportedcontrolRequestsaresponseintheformatofthesupportedcharacterRequestscurrentDTErate,stop-bits,parity,andnumber-of-characterbits.[V24]signalusedtoltheDCEdevicetheDTEdeviceisnowpresent.Sendsspecialcarriermodulationusedtospecify[V24]style ement NotificationtohosttoissueGET_ENCAPSULATED_RESPONSEReturnsthecurrentstateofthecarrierdetect,break,andringACM模式下的異步事件通 第二部分CDC類軟件框架介 USBDeviceUSBDeviceUSBDeviceUSBDeviceHALUSBDeviceLowLevelDriver USBD_Core與USBD_CDC的關(guān)

CDC

USBD核與USBD類完全分 eviceFS,&USBD_CDC);將

CDCUSBD核與USBD類完全分 USBDCDCIf

CDC

APP的接口,在初始化時(shí)到USBD核與USBD類完全分

USBD類與Application完全分

此變量在s_cc_fc文件，有CubMx自動(dòng)生成將 進(jìn)CD實(shí)CDCP。USBDCDC類使用示例(初始化 初始化分4步初始化USBD內(nèi)給USBD內(nèi) USBD_CDC給USBD_CDC USBD_CDC_If接正式啟動(dòng)USBDCDC類使用接口函數(shù)(通信 發(fā)送函數(shù)uint8_tCDC_Transmit_FS(uint8_t*Buf,uint16_t