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Contents Programming For USB Device Overview Programmers Guide Scenario Data transfer Synchronous Transfer Asynchronous Transfer Reading Descriptors USB Support Routines And Structures Common Procedures UsbEnumerateDevices OpenRapidUsb IsRapidUsbOpened CloseRapidUsb Descriptors UsbGetDescriptor UsbGetDeviceDescriptor UsbGetStringDescriptor UsbGetConfigDescriptor UsbFreeConfigDescriptor UsbGetInterfaceDescriptor UsbFreeInterfaceDescriptor UsbGetEndpointDescriptor Configure Device UsbGetDeviceInfo UsbUnconfigureDevice UsbSelectConfig UsbGetConfig UsbSelectInterface UsbGetInterface UsbResetDevice UsbGetBandwidthInfo UsbCyclePort Features and Status UsbSetFeature UsbClearFeature UsbGetStatus Vendor/Class Requests UsbVendorRequestIn UsbVendorRequestOut UsbClassRequestIn UsbClassRequestOut Pipes IsRapidUsbPipeOpened UsbPipeOpen UsbPipeClose UsbGetPipeCount UsbPipeGetInfo UsbPipeDirectionIn UsbPipeGetType UsbTransfer UsbTransferAsync TRANSFER_COMPLETION_ROUTINE UsbCancelTransfer UsbPipeReset UsbPipeAbort Other UsbGetPortStatus UsbGetCurrentFrameNumber USB Structures and Types RDUSB_DEVICE_INFORMATION RDUSB_PIPE_INFORMATION RDUSB_PIPE_TYPE RDUSB_BANDWIDTH_INFORMATION		Asynchronous Transfer Go to RapidDriver Main Page Asynchronous Transfer Data transfer in asynchronous mode is done using functions UsbTransferAsync, UsbCancelTransfer and TRANSFER_COMPLETION_ROUTINE. This type of transfer is more complicated than synchronous but is allows an application to continue execution during transfer is pending or in process. Interface DLL calls user specified callback to signal that transfer is finished or canceled. For more information about asynchronous transfer refer to 'PipesAsync' example.