7200_Free_Dma_Mem; 7200_Alloc_Dbdma_Mem - ADLINK Technology cPCI-7200 User Manual

5.14 _7200_Free_DMA_Mem

@ Description
Release the system DMA memory under Windows 95/98 environment. This
function is only available in Windows 95/98 version.
@ Syntax
Visual C++ (Windows 95)
int W_7200_Free_DMA_Mem (U32 handle)
Visual Basic (Windows 95)
W_7200_Free_DMA_Mem (ByVal handle As Long ) As Long
@ Argument
handle:
@ Return Code
ERR_NoError

5.15 _7200_Alloc_DBDMA_Mem

@ Description
Contact Windows 95/98 system to allocate a block of contiguous memory as
circular buffer for double-buffered DMA DI transfer. This function is only
available in Windows 95/98 version. For double-buffered transfer principle,
please refer to Section 6 "Double Buffered Mode Principle".
@ Syntax
Visual C++ (Windows 95)
int W_7200_Alloc_DBDMA_Mem (U32 *buff,U32 *handle, U32
buf_size, U32 *actual_size)
Visual Basic (Windows 95)
W_7200_Alloc_DBDMA_Mem (buff As Long, handle As Long, ByVal
buf_size As Long, actual_size As Long) As Long
@ Argument
buff : There is a dummy buffer attached to the DMA memory this function
will allocate. But this buffer need to have size equal to or more than buf_size
bytes.
handle:
Use this handle in _7200_DI_DMA_Start.
buf_size:
That is, this is the size of each half buffer in byte.
actual_size: The actual DMA memory size system allocate for each half
buffer. If system is not able to get a block of contiguous memory of specified
buf_size, it will allocate a block of memory as large as it can. In this case, this
function returns ERR_SmallerDMAMemAllocated, and actual_size denotes
The handle of system DMA memory to release.
The handle of system DMA memory returned from system.
Bytes to allocate. This is the half size of circular buffer in byte.
C/C++ Libraries 39