HP (Hewlett-Packard) 9112 Series ユーザーズマニュアル

 

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 )