ADLINK PCIe-7300A - Manual (Page 90)

80 C/C++ Libraries
ByVal clear_fifo As Long, ByVal disable_di
As Long) As Long
C/C++ (DOS)
int _7300_DI_DMA_Start (int card_number, int
mode, U32 *buffer, U32 count, int
clear_fifo, int disable_di)
@ Argument
card_number :The card number of the cPCI/PCI/PCIe-7300A
card.
mode (DOS):CHAIN_DMA: chaining DMA mode. By using the
scatter-gather capability of cPCI/PCI/PCIe-7300A, the input data
is put to several buffers which chained together.
NON_CHAIN_DMA: The input data is stored in a block of
contiguous memory.
memID (Win-95): the memory ID of the allocated system DMA
memory. In Windows 95 environment, before calling
W_7300_DI_DMA_Start, W_7300_Alloc_DMA_Mem must be
called to allocate a DMA memory. W_7300_Alloc_DMA_Mem will
return a memory ID for identifying the allocated DMA memory, as
well as the linear address of the DMA memory for user to access
the data.
buffer (DOS):With non-chaining mode, this is the start address of
the memory buffer to store the DI data. With chaining-mode (scat-
ter-gather), this is the address (pointer) of first DMA descriptor
node.
**With non-chaining mode, this memory should be double-
word alignment. With chaining-mode, this address should be
16-byte alignment. Also the pointer of all DMA descriptor
nodes should be 16-byte alignment.
count :With non-chaining mode, this is the number of digital input
to transfer. The unit is double-word (4-byte). The value of count
can not exceed 2^21 (about 2 million). With chaining mode, please
set this argument to 0. The number of digital input is determined
by the information in DMA descriptor nodes.
clear_fifo :0: retain the FIFO data
1: clear FIFO data before perform digital input