CEDDK Dynamic-Link Library DMA Functions (Windows Embedded CE 6.0)
1/6/2010
The following table shows the CEDDK.dll direct memory access (DMA) functions.
| Function | Description |
|---|---|
This function prepares the system for a DMA operation on behalf of the target device and also returns a handle that can be used by DMAIssueTransfer |
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This function cancels an active DMA transfer. |
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This function is called after DMA is finished and frees all the resources that were allocated by DMAOpenBuffer It also calls DMAFlushBlockBuffer before it returns. |
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This function closes a DMA transfer and releases all related resources. |
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This function frees a DMA channel buffer allocated by DMAAllocateChannel, along with all the resources the DMA channel uses. |
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This function manually flushes the DMA buffer block in order to regain cache coherency. |
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This function is used to return the length and physical address of a DMA buffer block created by DMAOpenBuffer. |
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This function is returns the length and physical address of a DMA buffer block created by DMAOpenBuffer. |
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This function retrieves the Context1 and Context2 values of a DMA transfer object. These values are set by functions such as DMAIssueTransfer during the creation of a DMA transfer object. |
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This function gets the current status of an active or queued DMA transfer. |
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This function queues multiple DMA transfer requests. Much like DMAIssueTransfer, if there are no other DMA transfer queued in the DMA channel, this function sets up map descriptor registers for a channel to map the first DMA transfer from a locked-down buffer. |
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This function sets up map descriptor registers for a channel to map a DMA transfer from a locked-down buffer. This function fails if there are other DMA transfers queued in the DMA channel. |
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This function sets up map descriptor registers for a channel to map a DMA transfer from a locked-down buffer. If there are other DMA transfers queued in the DMA channel this transfer is queued as well. |
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This function is used to map a virtual buffer to a physical DMA block. |
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This function controls hardware mapped DMA transfers directly, unless the transfer is already completed or is not queued. |
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This function puts a DMA transfer into auto start mode. |
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This function is used to start a slave DMA transfer that uses an associated memory block. |
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This function allocates memory, locks it down, and maps it so that it is simultaneously accessible from the processor and a device for DMA operations. |
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This function frees a common buffer allocated by HalAllocateCommonBuffer, along with all resources the buffer uses. |
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This function translates a physical system address to a logical bus address, which can be passed to a bus controller, for example, a DMA bus controller. |