United Electronic Industries PD2-MF, User Manual

Page: 76 / 152

Chapter 4: PowerDAQ Software (SDK)
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your buffer with samples. When it returns event from the
board you have to check what caused it
•
Check events
#
_PdGetUserEvents(…)
This function returns events for the subsystem specified
(AnalogIn). Your code should analyze them and make a
decision based on the result.
An Event word could contain following flags:
eFrameDone – get a frame of data
eBuff eStopped – acquisition is completed. All
data is stored in the buffer. Data is available for analysis.
eBufferError – data integrity was compromised because of
lack of performance or system latency while serving
interrupts (see note about interrupts). On board A/D FIFO
overflows. If error persists check interrupt settings and/or
purchase bigger A/D FIFO option.
•
Reset events
#
_PdSetUserEvents(…)
Call this function to notify the driver that events are
processed.
Restart
•
Stop asynchronous operation
#
_PdAInAsyncStop(…)
# _PdAInAsyncTerm(…)
This call stops asynchronous operation. You need to call
these functions before you call _PdAInAsyncInit(…)and
_PdAInAsyncStart(…).You can start and restart acquisition
as many times as your application needs. Each time you
restart acquisition, board overwrites data in the buffer with
a new one.
De-Initialization
•
Stop asynchronous operation
#
_PdAInAsyncStop(…)
#
_PdAInAsyncTerm(…)
•
Release event object handle
#
_PdAInClearPrivateEvent(…)
•
Unregister and deallocate buffer