external triggers missed on PCIe-6321

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Adam Ranson 2019-2-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/442654-external-triggers-missed-on-pcie-6321

What I would like to do is to trigger output of an analogue waveform when an external trigger is received using a PCIe-6321. If further triggers are received while the waveform is being output I want these to be ignored. Once the waveform output is complete I want the trigger to be 'rearmed' and when received to play the analogue output again. This is the code:

daqSessionZ = daq.createSession('ni'); daqSessionZ.Rate = 10000;

daqSessionZ.IsContinuous = false; daqSessionZ.addTriggerConnection('External','Dev2/PFI12','StartTrigger'); daqSessionZ.ExternalTriggerTimeout = Inf;

daqSessionZ.TriggersPerRun = Inf;

waveform = linspace(0,5,10000)'; queueOutputData(daqSessionZ,waveform);

daqSessionZ.startBackground();

This does trigger in response to 5v pulses on Dev2/PFI12 but often misses triggers because it seems to take ~300ms to 'rearm' after the waveform has finished playing. Am I not doing this in the right way?

Thanks

Adam