Cypress-USB教程第1讲课件

USBInterfacingLaneHauckPrerequesitesTogetthemostfromthiscourse,youshouldhaveanEZ-USBDevelopmentSystem.ThissystemincludesaDevelopmentBoardandtheKeilsoftwaredevelopmenttools.Mostchaptersincludeexamplecodeandsimpleprogrammingassignments.Tocompletetheassignments,youmustbeabletowrite8051firmwareusingtheClanguage.TodevelopcodeandruntheUSBdesigns,youmusthaveaccesstoaPCequippedwithaUSBport,andrunningWindows98MeorWindows2000.”AgendaUSBhistoryUSBDemoMouse,Speakers,CameraUSBBasics:10USBFacts8051PrimerEZ-USBArchitectureOnionintroductionUSBResourcesUSBFoundingCompaniesUSB1.0USB2.0CompaqCompaqIntelIntelMicrosoftMicrosoftNECNECIBMLucentDECHPNorthernTelecomPhilipsUSBDemoPluginsomeperipheralsMouseSpeakersCameraNoticethattheyare:“Hotplugged”PoweredbytheUSBcable Question:HowdidthePCknowwhatwaspluggedinandwhichdrivertoload?USBBasicsCablesFourwires:Vbus,GND,D+,D–Vbus:5Vnom,4.4Vminimum(nowallwarts!)Cablesare5metersMAXTwoconnectortypes,AandBPreventsillegaltopologiesUSBextensioncablesareILLEGALPChasa“roothub”with1or2portsEachportsupplies5“unitloads”or500maHubsexpandnumberofdevicesto1267-bitaddress=128–roothub–reservedaddr0Hubscanbebusorself-powered100/500maperdownstreamport10USBFactsFact1

USBisnotsimpleOutside,itissimpleThe“richuserexperience”requiressomeinnercomplexityEventhoughitreplacesserialandparallelports,it’snotadrop-inreplacementIt’selectricallysimple,butawholeprotocollayerisaddedFact2

TheHost(PC)initiatesalltransfersDevicesrespondtohostrequestsDirection:OUTishost-to-deviceDirection:INisdevice-to-hostUSBisNOTpeer-to-peerUSBTopology(a)DeviceDevicePCUSBUSBUSBTopology(b)PCUSBUSB“TieredStar”HubUSBUSBUSBUSBPCUSBUSBDeviceDeviceDeviceDeviceDeviceFact3

USBsupportsthreespeeds

Lowspeedis1.5Mb/sMiceKeyboardsFullspeedis12Mb/sModemsCamerasSpeakersPrintersHighspeedis480Mb/sUSB2.0iscomingFact4

AnEndpointIsanAddressableFIFO

USBSpec:“asourceorsinkofdata”CONTROLendpointisbi-directionalOthersareuni-directionalFouraddressbitsplusadirectionbitselectsbetween32buffers(FIFOs)DifferentUSBchipssupportVariousnumbersofendpointsVariousbuffersizesFact5

USBSupportsFourTransferTypesBulkGuaranteedaccuracy,butdeliverytimeisvariableBestfor“bursty”dataIsochronousGuaranteeddeliverytime,butaccuracyisnotguaranteedControlEnumerationanddevicecontrolInterruptPredictablepollingtimeFact6

USBTransfersOccurin1msFramesHostsends“SOF”(StartOfFrame)tokenevery1msHostschedulespacketsinsideframes.IsochronousdataFIFOS“ping-pong”everySOFAnatomyofaUSBFrame12MHz=1.5MB/sor1500bytes/msIsochronous/InterrupttraffichaveguaranteedbandwidthControltrafficis“best-effort”BulkuseswhatisleftActualschedulingorderdependsonhostcontrollerUHCI,OHCIVideoAudioMouseControlPrinterPrinter1msecframeSOF...IsochronousInterruptControlBulkSOFFact7

USBDataTravelsinPacketsIdentifiedby“PacketID”(PID)Tokenpackettellswhat’scomingDatapacketsdeliverbytesHandshakepacketsreportsuccessorotherwiseUSBPacketsSETUPADDRCRC5SYNCENDPDATA0CRC16SYNCDataACKSYNCTokenPacketDataPacketH/SPktSetupStageDataStageDataStage(cont'd)DataStage(cont'd)AControlWriteTransferDATA1CRC16SYNCDataDataPacketACKSYNCH/SPktOUTADDRCRC5SYNCENDPTokenPacketDATA0CRC16SYNCDataDataPacketACKSYNCH/SPktOUTADDRCRC5SYNCENDPTokenPacketDATA1CRC16SYNCDataACKSYNCH/SPktDataPacketOUTADDRCRC5SYNCENDPTokenPacketINADDRCRC5SYNCENDPDATA1CRC16SYNCACKSYNCDataPacketH/SPktTokenPacketStatusStageTheSIE

(SerialInterfaceEngine)SerialInterfaceEngine(SIE)D+BytesUSBTransceiverD+Fact8

Bulk/Ctl/IntTransfersHaveErrorRecoverySuccess=ACKtokenError=Noresponse(timeout)Busy=NAKtoken(tryagainlater)Fact9

ErroneousorMissingISODataIsLostNohandshakesorretriesIndividualapplicationmusthandleerrorsFact10

USBProjectsRequireaSignificant

CodeDevelopmentEffortDevicesideUSBhouskeepingfirmwareApplicationfirmwareHostsideDriver(maybe)ApplicationsoftwareTheEZ-USBDevelopmentkitsupplieshelpforbothsides,especiallythedevicesideFact11(OK,11facts)

ConformtoastandardUSBdeviceclass,andyouwon’tneedtowriteadriver.BIG

incentiveSpendeffortmakingfirmwareclass-compliantInWin98HID(HumanInterfaceDevice)SpeakersCommAdditionalWin2000andMillenniumdevicesMassstorageStillimagePrinter8051Primer8051Primer

Ass’ylangaccesstoInternalRegisters128GPRegisters00SFRegisters80FF7F128GPRegisters8052orEZ-USBFF80mov a,SBUF0mov TCON,#55hmyvar equ 40hmov a,r0mov myvar,aDirectAddressingIndirectAddressingmov r0,#90hmov a,@r0mov SP,#80h8051Primer

’C’accesstoInternalRegisters128GPRegisters00SFRegisters80FF7F128GPRegisters8052orEZ-USBFF80char(data)TCON;TCON=0x55;char(data)myvar1;myvar1=othervar;DirectAddressingIndirectAddressingcharidatamyvar2myvar2=0x558051Primer

Ass’ylangaccessto

8051ExternalMemory64KilobytesRAMFFFF000064KilobytesROMFFFF0000mov dptr,#8051hmovx a,@dptrmov MPAGE,#80hmov r0,#51hmovx a,@r0mov dptr,#8051hmovc a,@dptrRD#WR#PSEN#DataProgram8051Primer

’C’accessto

8051ExternalMemory64KilobytesRAMFFFF000064KilobytesROMFFFF0000charxdatadig[]=3,5,7;num=dig[2];RD#WR#PSEN#DataProgramcharcodedig[]=3,5,7;num=dig[2];8051Primer

EZ-USBInternalRAM8KilobytesRAMFFFF00008KilobytesRAMFFFF0000RD#WR#PSEN#7FFF7FFF8051Primer

EZ-USBCOMBINESinternal8KProgram&DataRAM8KilobytesRAM0000RD#WR#PSEN#7FFFcharxdatadig[]=3,5,7;num=dig[2];charcodedig[]=3,5,7;num=dig[2];isequivalenttoTherefore:8051Primer

EZ-USBControlRegistersandEndpointbuffers

Assemblylanguageaccess0000RD#WR#PSEN#7FFF7B40AllEZ-USBcontrolandstatusregistersandendpointbuffersarehere.Accessthemusingthedatapointerand‘movx’instruction.Example:mov dptr,#OUT2BCmov a,#35movx @dptr,a0000RD#WR#PSEN#7FFF7B40XdatacharOUT2BC_at_0x7FC9;….OUT2BC=45;8051Primer

EZ-USBControlRegistersandEndpointbuffers

CaccessEZ-USBArchitectureLearningUSB

TheConventionalWayUSBLearningContinuumPracticeTheoryStartFinishEnumerationcodetimeUSBLearningContinuumPracticeTheoryLearningUSB

UsingtheEZ-USBChipLearnhowtoservicedevicerequeststosetupUSBdevicesWriteCcodetoperformUSBtransfersusingpre-EnumeratedUSBdevice.(Lecture2:aBULK-INUSBtransfer.)timetimeStartFinishFinishDevelopmentKitContentsEZ-USBdevelopmentboardPrototypingboardEZ-USBdevelopmentsoftwareControlpanelKeiltoolsetAssemblerCcompilerLimited(4Kilobyte)codesizeEZ-USBTechnicalReferenceManualAndersonbookNecessarycablesDevelopmentFlowBulkINTransferxdatavolatilecharIN2BUF[64]_at_0x7E00;xdatavolatilecharIN2BC_at_0x7FB9;xdatavolatilecharIN2CS_at_0x7FB8;#define bBSY 0x02charj,count;main(){for(j=0;j<64;j++) //fillIN2bufferwithincrementingcount

IN2BUF[j]=j;IN2BC=64; //armthefirstIN2transfercount=0;while(1) //forever { while(IN2CS&bBSY); //loopwhileIN2busybitisHI

IN2BUF[0]=++count; //busybitwentLO--IN2BUFreadyformoredata

IN2BC=64; //armthenextIN2transferbyloadingbytecount } }BulkOUTTransfermain(){while(1) { while(OUT2CS&bBSY); //loopwhileEP2OUTbusybitisHI count=OUT2BC; //BusybitisLO--EP2OUTdatawassent for(j=0;j<count;j++) { display_hex(Digit[OUT2BUF[j]]);//usebyteinEP2OUTtolookupsegments delay(DISPLAYTIME); //delaysowecanseeit display_hex(0xFF); //blankdisplay(active-lowsegments;1=off) delay(DISPLAYTIME); }

OUT2BC =0; //armthenextOUT2transfer(BC=x) }}Assemblycode:AHandy8051MacroLDREG MACRO ad,val ;Loadregisterwithval mov a,val mov dptr,#ad movx @dptr,a ENDMBulkINTransfer(AssyCode)start: mov dptr,#IN2BUF mov r7,#64 ;fillEP2INbufferwith64bytesfill: mov a,r7 movx @dptr,a inc dptr djnz r7,fill ;loaddecrementingcounterstartingw.64 mov count,#0 ;counttheINtransfers

LDREG

IN2BC,#64 ;loadtheIN2ByteCountRegisterloop: JBL IN2CS,BSY,IN2 ;checkthebusybit sjmp loopIN2: inc count ;INpacketcounter

LDREG

IN2BUF,count ;put‘count’intofirstbufferbyte

LDREG

IN2BC,#64 ;thisarmstheINtra