DEVICE_DMA_REQUIREMENT_INFO (Windows Embedded CE 6.0)
1/6/2010
This structure is used by DMAGetAdapter when DMAGetAdapter populates a direct memory access (DMA) adapter structure for a physical device
Syntax
typedef struct _DEVICE_DMA_REQUIRMENT_INFO {
ULONG Size;
BOOLEAN DemandMode;
BOOLEAN BusMaster;
INTERFACE_TYPE InterfaceType;
ULONG BusNumber;
ULONG DeviceLocation;
ULONG DmaAdapter;
CE_REGISTER_ACCESS_WIDTH CeDmaWidth;
CE_DMA_SPEED DmaSpeed;
DWORD dwFlags;
} DEVICE_DMA_REQUIRMENT_INFO , *PDEVICE_DMA_REQUIRMENT_INFO;
Members
- Size
Size of this structure in bytes.
- DemandMode
Set to TRUE if the device and the DMA hardware have hardware handshaking.
- BusMaster
Indicates whether the device is a bus master.
- InterfaceType
Interface type on the device. This value could be internal or PCI. The specific value can be found by examining the registry.
- BusNumber
Indicates the location of the hardware. The specific value can be found by examining the registry.
- DeviceLocation
Device location identifier. This parameter is specific to the type of bus. For a PCI bus, this parameter is a PCI_SLOT_NUMBER value, which is the slot and function numbers combined.
- DmaAdapter
An optional parameter, set to DMA_ADAPTER_ANY if the system has only one DMA Adapter or the application does not care which DMA adapter is used.
- CeDmaWidth
Indicates whether an 8-bit, 16-bit, 32-bit or 64-bit operation should be performed during DMA transfer.
- DmaSpeed
DMA Speed is used by DMAGetAdapter to determine the DMA Adapter and Channel to use. The fastest device should use the highest priority DMA Adaptor and Channel.
- dwFlags
Global DMA transfer flag. This flag is used to determine what kind of transfer the device wants. One valid flag is DMA_FLAGS_INC_DEVICE_ADDRESS, which indicates that the device wants to perform memory to memory DMA transfer.
Requirements
| Header | oaldma.h |
| Windows Embedded CE | Windows Embedded CE 6.0 and later |