Intel cPCI-7200 Benutzerhandbuch

 

5.14 _7200_Free_DMA_Mem 

Release the system DMA memory under Windows 95/98 environment. This 
function is only available in Windows 95/98 version. 

int W_7200_Free_DMA_Mem (U32 handle) 

W_7200_Free_DMA_Mem (ByVal handle As Long ) As Long 

The handle of system DMA memory to release. 

ERR_NoError 

5.15 _7200_Alloc_DBDMA_Mem 

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”. 

int W_7200_Alloc_DBDMA_Mem (U32 *buff,U32 *handle, U32 

buf_size, U32 *actual_size) 

 

W_7200_Alloc_DBDMA_Mem (buff As Long, handle As Long, ByVal 

buf_size As Long, actual_size As Long) As Long 

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: 

The handle of system DMA memory returned from system. 

Use this handle in _7200_DI_DMA_Start. 
buf_size: 

Bytes to allocate. This is the half size of circular buffer in byte. 

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