Technical Document #18


Technical Document #18

Doc ID: 18
Product: WinDriver
Version:  --

Can WinDriver group I/O and memory transfers?

Yes. Using WinDriver, you can group I/O and memory transfers by calling WD_MultiTransfer(), which can perform multiple transfers in one call.

Please note that you can also access the memory directly from your user mode application, using the virtual user-mode mapping of the physical address, which is returned by WD_CardRegister() in:
cardReg.Card.Item[i].I.Mem.dwUserDirectAddr
(where 'i' is the index item of the relevant memory item in the WD_ITEMS 'Item' array).

Please refer to Technical Document #17 for suggestions on how to improve the performance of your driver with WinDriver.

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