Data Translation DT9820 Series, User Manual

Page: 65 / 112

Programming Flowcharts
53
4
4
4
4
4
4
4
4
4
Deal with A/D Messages and Buffers
An error
occurred?
No
Go to the next page.
Yes
Report the error.
A buffer
reused
message
occurred?
No
Yes
Increment a counter, if
desired.
A queue
done
message
occurred?
No
Yes
Report the condition.
A buffer
done
message
occurred?
No
Yes
Process
data?
No
Yes
Retrieve the buffer from
the done queue using
olDaGetBuffer
Determine the number of
samples in the buffer using
olDmGetValidSamples
Go to the next page.
The most likely error messages include
OLDA_WM_OVERRUN and
OLDA_WM_TRIGGERERROR.
OLDA_WM_TRIGGERERROR is reported
if a digital event trigger is specified and the A/D
operation is stopped using an external digital trigger.
You may wish to set up new buffers for the next
operation (see
page 15 ).
The buffer reused message is
OLDA_WM_BUFFER_REUSED.
The queue done messages are
OLDA_WM_QUEUE_DONE and
OLDA_WM_QUEUE_STOPPED. After
reporting that the acquisition has stopped,
you may wish to clean up the operation
(see page 56 ).