DAQmxReadDigitalLines never finishes despite reading all required samples

[krugman3]

I am using

DAQmxReadDigitalLines (taskHandle, -1, 2.0, DAQmx_Val_GroupByChannel, laneSamples, SAMPLES_TO_READ, &samplesRead, &bytesPerChannel, 0)

following a small delay, samplesRead is equal to  SAMPLES_TO_READ i.e. all expected samples have been captured.

However, when I call DAQmxStopTask(taskHandle), I get warning code 200010 Which means "Finite acquisition or generation has been stopped before the requested number of samples were acquired or generated".

So, I tried repeatedly calling DAQmxIsTaskDone(taskHandle, &taskDone);

but taskDone is never anything other than 0

[krugman3 · Accepted solution]

In my call to DAQmxCfgSampClkTiming much earlier on nin the code, I had set the wrong number of samples.

Now fixed and all is okay again.