NI DAQ analog output regeneration

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Hunter Davis 2020-6-30

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/557353-ni-daq-analog-output-regeneration

评论： Daniel Hill 2020-10-29

Using an NI USB 6366 DAQ to generate a continuous output analog waveform, I keep getting underflow errors "Output underflow event: Last valid output was scan number 199977121". The output sample frequency is 2 MHz, and I have tried all sorts of different buffer sizes. In Labview, I can change the "allow regeneration" mode for analog outputs to allow the DAQ to just loop the onboard FIFO without requiring fresh data from the host computer. How do I do this in matlab? The waveform needs to be continously output for hours at a time, so this instability is really a problem.

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Answer 1

Hunter Davis 2020-10-10

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https://ww2.mathworks.cn/matlabcentral/answers/557353-ni-daq-analog-output-regeneration#answer_510346

In case someone else stumbles on this, there is a low-level function daq.ni.NIDAQmx.DAQmxSetWriteRegenMode that allows you to directly modify this setting in the DAQ.

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Daniel Hill 2020-10-29

Hi Hunter,

I'm pretty green when it comes to programming and my labview/NI knowledge is extremey limited. I'm getting an 'Output underflow error' and I'm hoping this will help. I'm embarrassed to say that I have no idea how to implement it in matlab. I looked at the doc but can't firgure it out

(daq.ni.NIDAQmx.DAQmxSetWriteRegenMode is a function.

[status] = DAQmxSetWriteRegenMode(taskHandle, data)

Can you tell me what I need to call for 'taskhandle'and 'data' to get this thing to allow regeneration? (I'm assuming it's automatically in non-regeneration mode based on what I read here: https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000019P1kSAE&l=en-GB).

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