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C/C++ Library
AD data, the buffer size must large than the number of AD conversion.
In DOS environment, please make sure this memory is double-word
alignment. Every 16-bit unsigned integer data in ad_buffer:
D11 D10 D9 .......................D1 D0 C3 C2 C1 C0
D11, D10, ..., D1, D0 : A/D converted data
C3, C2, C1, C0 : converted channel no.
memID(Windows-95) : the memory ID of the allocated system DMA
memory to act as the circular buffer. In Windows 95 environment, before
calling W_9112_ContDmaStart, W_9112_Alloc_DMA_Mem must be
called to allocate a contiguous DMA memory. W_9112_Alloc_DMA_Mem
will return a memory ID for identify the allocated DMA memory, as well as
the linear address of the DMA memory for user to access the data. The
format of the A/D data is the same as DOS buffer (ad_buffer argument).
c1 : the 16-bit timer frequency divider of timer channel #1
c2 : the 16-bit timer frequency divider of timer channel #2
u Return Code
ERR_NoError, ERR_BoardNoInit,
ERR_InvalidADChannel, ERR_AD_InvalidRange,
ERR_InvalidTimerValue
u Example
See Demo Program 'AD_DEMO5.C'
5.18 _9112_CheckHalfReady
u Description
When you use _9112_ContDmaStart() to convert A/D data then you must
use _9112_CheckHalfReady() to check data ready or not in the circular
buffer, size of data is half of the circular buffer (count/2) and using
_9112_DblBufferTransfer() to get data.
u Syntax
Visual C++ (Windows-95)
int W_9112_CheckHalfReady (int card_number, int * halfReady)
Visual Basic (Windows-95)
int W_9112_CheckHalfReady (ByVal card_number As Long, halfReady
As Long) As Long
C/C++ ( DOS)
int _9112_CheckHalfReady(int card_number, int *halfReady )