DAQmxRepeatTask syntax

I want to build an oscilloscope limited to card PCI-4474 with four analog inputs and level trigger similar on one of these four analog inputs. With CVI "CQI-IntClk-AnlgStart" example I have most of the code.

Then with one - button start stop, I want it repeated acquisition 1000 samples in the analog-trigger, trace the curves of four and goes for the next trigger. The option (that I found in this forum) for redeclenchables DAQmxSetTrigAttribute is (according to the CVI debug information) not supported for this Council.

Next ideais (probably not unique) to divide the example in some functions with the use of DAQmxRegisterDoneEvent:

create tasks with and others.

DAQmxErrChk (DAQmxCreateTask("",&gTaskHandle));
DAQmxErrChk (DAQmxCreateAIVoltageChan(gTaskHandle,chan,"",DAQmx_Val_Cfg_Default,min,max,DAQmx_Val_Volts,));
DAQmxErrChk (DAQmxCfgSampClkTiming (gTaskHandle",", rate, DAQmx_Val_Rising, DAQmx_Val_FiniteSamps, gSampsPerChan));
DAQmxErrChk (DAQmxCfgAnlgEdgeStartTrig (gTaskHandle, triggerSource, triggerSlope, triggerLevel));
DAQmxErrChk (DAQmxSetTrigAttribute (gTaskHandle, DAQmx_AnlgEdge_StartTrig_Hyst, triggerHysteresis));
DAQmxErrChk (DAQmxGetTaskAttribute (gTaskHandle, DAQmx_Task_NumChans, & gNumChannels));

Start with and others.

DAQmxErrChk (DAQmxRegisterDoneEvent(gTaskHandle,0,DoneCallback,));
DAQmxErrChk (DAQmxStartTask (gTaskHandle));

DoneCallback that is called when the task has completed the acquisition of its finite number of samples

DAQmxErrChk (DAQmxReadAnalogF64 (gTaskHandle,...))

DeleteGraphPlot (panelHandle, PANEL_GRAPH,-1, VAL_DELAYED_DRAW);
If (Seek_set > 0)
for (i = 0; i<>
Foot (panelHandle, PANEL_GRAPH, &(gData...)
RefreshGraph (panelHandle, PANEL_GRAPH);
DAQmxErrChk (DAQmxStartTask (gTaskHandle));

This does NOT work unless I have insert in this DoneCallback DAQmxStopTask before starting the task. This isn't what I expected, because the callback function is called because the task has completed. And this is not what I prefer, because the manual of the CVI reports this judgment and start a task will reduce performance. So I have two questions:

Can Q: you someone explain or refer to a text What's the difference between the task accomplished and task-stopped in combination with the start task?

Q: what is the best syntax of DAQmxRepeatTask (not yet found) when re-trigger is required for the synchronisation and when this special attribute is not supperted for card PCI-4474?

Kind regards, Jos

Hi Jos,

Help OR-DAQmx said the task performed the following:

When a task is completed?

If the measure or the generation is finished, the task is made when you acquire or generate the final sample or when you call the function stop task/VI. If the measure or the generation is continuous (including synchronization on demand), the task is not made until you call the function stop task/VI. In addition, the task is performed if a fatal error is generated during the execution of the measure or generation, or you give up the measurement or generation. Search for the errors and warnings to check the task completed successfully.

> This does NOT work unless I have insert in this DoneCallback DAQmxStopTask before starting the task. This isn't what I expected, because the callback function is called because the task has completed.

The callback function is called because the task is finished and the final sample was acquired. Acquisition of the final sample don't automatically pass the task of the "running" State to the "committed" State, it must always stop the task before you can start it again. See that section for help NOR-titled DAQmx 'model task status' for an explanation of the different States.

> And this is not what I prefer, because the manual of the CVI reports this judgment and start a task will reduce performance.

Yes, but in this case, I think that stop is necessary. In other cases, it is not necessary. For example, you wouldn't stop and start the task between each sample.

There is a way to reduce the overhead of the judgment and the task to start: commit the task by calling DAQmxTaskControl(..., DAQmx_Val_Task_Commit) in the front. In this way, you don't waste time uncommitting, unreserving, re - book and re-engaging the task each time.

Anyway, the performance does not satisfy your needs? If not, what are your performance requirements?

Brad

Tags: NI Software

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