Lucent Technologies USS-720 manual Ioctlgetdevicedescriptor

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Preliminary User Guide, Rev. 2	USS-720
February 1999	USB Device Driver

4 I/O Control Codes (continued)

4.12 IOCTL_GET_DEVICE_DESCRIPTOR

IOCTL_GET_DEVICE_DESCRIPTOR retrieves the current device descriptor. Details regarding parameters and error codes follow.

4.12.1 Parameters

lpInBuffer—Points to an input buffer. Not used with this operation. Set to NULL.

nInBufferSize—Speciﬁes the size (in bytes) of the buffer pointed to by lpInBuffer. Not used with this operation. Set to zero.

lpOutBuffer—Points to an output buffer that will receive a USB_DEVICE_DESCRIPTOR data structure (see WDM USB Driver Speciﬁcation).

nOutBufferSize—Speciﬁes the size (in bytes) of the buffer pointed to by lpOutBuffer, which must be large enough to contain the USB_DEVICE_DESCRIPTOR data structure (see WDM USB Driver Speciﬁcation). Specify zero to return only the length of the Device ID string in lpBytesReturned.

lpBytesReturned—Points to a DWORD that receives the actual size (in bytes) of the data stored into lpOutBuffer.

4.12.2 Notes

None.

4.12.3 Error Code

ERROR_NOT_ENOUGH_BUFFER—lpOutBuffer was not large enough to receive the USB Device Descriptor.

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Contents Information Manual, Rev September IntroductionTable of Contents September USB-to-IEEE Bridge Information Manual, Rev Evaluation Kit for USS-720IOCTL1284 Terminate USS-720 USB Device Driver Preliminary User GuideIOCTLSET1284REGISTER USS-720 USB Port Monitor Application Note Evaluation Kit Contents \SAMPLES Hardware RequirementsGetting Started Instructions OSR2.1 Cable Installation InstructionsWindows 98 Cable Installation Instructions Software UpdatesPlug and Play USB Driver and Port MonitorPort Creation Eeprom Lucent Technologies Inc In-System Design, Inc Lucent Technologies Microelectronics GroupUSB Applications Support September Introduction Evaluation Kit SoftwareUSS-720 Driver Software Object Code License Agreement FebruaryOwnership USS-720 Software Use Agreement FebruaryLicensed Software Furnishing of Licensed SoftwareFebruary Software Use Agreement USS-72004 Conﬁdentiality Warranty and IndemnityAgreement Prevails Nothing ConstruedIntegration PublicityNonassignability AddressesDisputes Applicable LawUSS720.INF USS720.SYSDocumentation USS-720 Software Use Agreement February Application Note, Rev February Software ComponentsPlug and Play Operation PnP Customer-Deﬁned DataPrinter Enumeration USB Hardware Types Supported Power ManagementInstallation Process Operating Systems SupportedPrint Types Supported Printer Types SupportedPreliminary Data Sheet, Rev September FeaturesDescription Table of Contents Pin Information Preliminary Data Sheet, Rev USS-720USB-to-IEEE Parallel Port nAck Signal Active-Low Parallel Port nAutoFd Signal Active-LowParallel Port nSelectIn Signal Active-Low Parallel Port nInit Signal Active-LowDescriptor Locations OverviewUSB Port Device Descriptor, Conﬁgurations, and Inter- facesOnboard Device Descriptor USB-to- Ieee 1284 Bridge SeptemberDevice Descriptor Offset Field Size Value Description Conﬁguration Descriptor USB-to- IeeeBulk Out Endpoint Descriptor, I0A0E1 Interface DescriptorsBulk Out Endpoint Descriptor, I0A1E1 September USB-to-IEEE1284 BridgeBulk In Endpoint Descriptor, I0A1E2 Bulk In Endpoint Descriptor, I0A2E2 Bulk Out Endpoint Descriptor, I0A2E1Interrupt Endpoint Descriptor, I0A2E3 Requests PipesStandard Requests Get Port Status Data Bit Description Printer Class-Speciﬁc RequestsGET1284REGISTER Vendor-Speciﬁc RequestsSET1284REGISTER Register-Based Operation Ieee 1284 PortByte Register Data RegistersGET1284REGISTER Data Byte Register Data Interrupt Pipe Read DataDefault Bit Symbol Bit Description Status Register Address Bit SymbolParallel Port nFault Signal Reserved USB-to-IEEE1284 Bridge Control Register Address Bit SymbolAccess Default Bit Symbol Bit Description Parallel Port nInit SignalUSS-720Instant USB ECP Command Register Address Bit Symbol Access Mode20 Description Extended Control Register Address Bit SymbolUSS-720 Control Register Address Bit Symbol USS-720 Setup Register Address Bit Symbol Interrupts External Crystal Connection External Circuitry RequirementsAbsolute Maximum Ratings Parameter Symbol Min Unit Filter Bypass ModeHigh Drive Mode Self-Powered ModeClklo Clkhi Electrical CharacteristicsParameter Symbol Test Conditions Min Typ Max Unit Capacitance Values Parameter UnitSetup and Hold Input Timing Parameter Timing CharacteristicsOutput Delay Timing Parameter Min Max Unit Device Code Package Comcode Outline DiagramOrdering Information Pin MqfpApplication Note February Description USS ParallelPort Bridging USB to Typical Circuit ShowingLucent Technologies Inc Preliminary User Guide, Rev February Signal DirectionsIOCTL1284 Setmode USB Device Driver InitializationO File Functions Preliminary User Guide, Rev USS-720 FebruaryCreateFile ReadFile Error CodesWriteFile DeviceIoControl CloseHandle Control Code Description O Control CodesParameters IOCTL1284 EcpfwdtorevIOCTL1284ECPREVTOFWD IOCTL1284 Ecpsetchannel IOCTL1284 Setmode Register Mode DescriptionIOCTL1284 Terminate Bulkinpipe IoctlabortpipeValue Description BulkoutpipeIoctlcancelpiperequest IOCTLGET1284REGISTER ALTINTERFACE2 IoctlgetaltsettingALTINTERFACE0 ALTINTERFACE1Ioctlgetcapabilities Ioctlgetconfigurationdescriptor Ioctlgetdevicedescriptor Ioctlgetdeviceinstances Ioctlgetinterface Bit Meaning IoctlgetportstatusCommand Description IOCTLISSUEUSS720COMMANDByte Description IoctlreadinterruptpipeIoctlresetpipe IOCTLSET1284REGISTER Ioctlsetaltsetting Ioctlsoftreset Data Structure O Control Data StructuresDeviceinstanceheader DeviceinstanceREGISTER1284, *PREGISTER1284 REGISTER1284ADVREGISTER1284, *PADVREGISTER1284 ADVREGISTER1284Lucent Technologies Inc USS-720 USB Port Monitor Printer Cable with Instant USB USS-720 Application Note USB Port Monitor FebruaryClick on Enter Library Software Installation InstructionsW98USS720EvalKit2402.zip to download the installation ﬁles Application Note JuneSeptember MN99-052CMPR-1 Replaces MN97-061CMPR-04