WDF_DMA_DIRECTION enumeration (wdfdmaenabler.h)
[Applies to KMDF only]
The WDF_DMA_DIRECTION enumeration defines the direction of a DMA transfer.
Syntax
typedef enum _WDF_DMA_DIRECTION {
WdfDmaDirectionReadFromDevice = FALSE,
WdfDmaDirectionWriteToDevice = TRUE
} WDF_DMA_DIRECTION;
Constants
WdfDmaDirectionReadFromDeviceValue: FALSE The DMA transfer direction is from the device (read). |
WdfDmaDirectionWriteToDeviceValue: TRUE The DMA transfer direction is to the device (write). |
Remarks
The WDF_DMA_DIRECTION enumeration is used as input to the EvtProgramDma callback function and the WdfDmaTransactionInitialize and WdfDmaTransactionInitializeUsingRequest methods.
Requirements
| Requirement | Value |
|---|---|
| Minimum KMDF version | 1.0 |
| Header | wdfdmaenabler.h (include Wdf.h) |