Data Translation DT9800 Series, User Manual

Page: 106 / 162

Chapter 4
94
Transfer Data from an In-process Buffer
Determine the number of
buffers on the in-process queue
using olDaGetQueueSize .
At least one must exist.
Allocate a buffer of the specified
number of samples with
olDmAllocBuffer ,
olDmCallocBuffer , or
olDmMallocBuffer .
Copy the data from the in-process
buffer to the allocated buffer for
immediate processing using
olDaFlushFromBufferInprocess .
Deal with messages and buffers
(see page 95 ).
The buffer into which in-process data was copied
was put onto the done queue by the driver,
resulting in an OLDA_WM_BUFFER_
DONE message.
When the in-process buffer has been filled, it too is
placed on the done queue and an
OLDA_WM_BUFFER_DONE message is posted.
However, the number of valid samples is equal to
the queue’s maximum samples minus what was
copied out.