Intel cPCI-7200 - Manual (Page 62)

54
• C/C++ Libraries
C/C++ (DOS)
int _7200_DO_DMA_Start (U8 mode, U32 count, U32 *do_buffer,
Boolean repeat)
@ Argument
mode: Digital output trigger modes
DO_MODE_0: Internal timer pacer (TIME 1)
DO_MODE_1: Internal timer pacer with O_REQ enable
DO_MODE_2: O_REQ & I_REQ handshaking
count:
the sample number of digital output data (in samples, not in bytes)
handle (Win 95):
the handle of system DMA memory. In Windows 95,
before calling W_7200_DO_DMA_Start, W_7200_Alloc_DMA_Mem must
be called to allocate a contiguous DMA memory and get the handle of it.
Also W_7200_Alloc_DMA_Mem will attach a buffer to DMA memory. The
DO data is stored in the buffer attached to this handle.
do_buffer (DOS):
the start address of the memory buffer to store the DO
data.
** This memory should be double-word alignment
repeat:
The digital output will be continuous or only one shot.
CONTINUOUS: digital output will be continuous until
_7200_DO_DMA_STOP is called.
ONE_SHOT : digital output only one-shot.
@ Return Code
ERR_NoError
ERR_InvalidDIMode
ERR_InvalidBoardNumber
ERR_BoardNoInit
ERR_InvalidDIOCnt
ERR_NotDWordAlign
ERR_DMATransferNotAllowed
5.25 _7200_DO_DMA_Status
@ Description
Since the _7200_DO_DMA_Start function is executed in background, users
can issue the function _7200_DO_DMA_Status to check its operation
status.
@ Syntax
Visual C++ (Windows 95)
int W_7200_DO_DMA_Status (U8 *status, U32 * count)
Visual Basic (Windows 95)
W_7200_DO_Status ( status As Byte, count As Long ) As Long