How to read external triggering count with DAQmxReadCounterU32?

[anarkie]

I'm uing PCI-6025E board and checked MAX can count DMI counter connected in /Dev1/PFI3 of ctr0.

But when I use DAQmxReadCounterU32 function in example code, it returns 0 of 'read' integer value but doesn't show the number of counting.

The example code is:

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 DAQmxErrChk (DAQmxCreateTask("",&taskHandle));
 DAQmxErrChk (DAQmxCreateCICountEdgesChan(taskHandle,"Dev1/ctr0","",DAQmx_Val_Rising,0,DAQmx_Val_CountUp));
 DAQmxErrChk (DAQmxCfgSampClkTiming(taskHandle,"/Dev1/PFI3",1000.0,DAQmx_Val_Rising,DAQmx_Val_ContSamps,1000));

 while(1) {
 
  DAQmxErrChk (DAQmxReadCounterU32(taskHandle,-1,10.0,data,100,&read,NULL));
  printf("\rAcquired %d samples",read);
 
  
  fflush(stdout);
 }

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I set the second parameter of DAQmxReadCounterU32() as -1 to read infinite DMI counting.

How can I read the DMI counting just like MAX does?

Thanks,

[DavidMN]

Hi anarkie,

This thread addresses your issue, and should be of some help.