MATLAB: Do I receive an the error “Undefined function or variable ‘NIFGEN_VAL_OUTPUT_ARB'” when attempting to use NI-FGEN Instrument Drivers

Question

I am trying to modify the code example for "Using NI-FGEN Instrument Driver To Generate A Sine Wave", available at:

https://www.mathworks.com/help/instrument/examples/using-ni-fgen-instrument-driver-to-generate-a-sine-wave.html

so that I can use an arbitrary waveform instead of a sine wave. However, when I replace the line:

 

invoke(ictObj.Configuration,'configureoutputmode',NIFGEN_VAL_OUTPUT_FUNC);

with 

 

invoke(ictObj.Configuration,'configureoutputmode',NIFGEN_VAL_OUTPUT_ARB);

I receive the error:

  ERROR: Undefined function or variable 'NIFGEN_VAL_OUTPUT_ARB'

Answer 1

The "NIFGEN_*" constants are defined in the "niFgen.h" header file included with the National Instruments drivers.

Search your machine for the "niFgen.h" file, open the file, and search it for the "NIFGEN_VAL_OUTPUT_ARB" variable. In this file, the variable is defined to a value of 1.

Now, above the invoke line in MATLAB, define a variable named "NIFGEN_VAL_OUTPUT_FUNC" to a value of 1, as shown:

 

NIFGEN_VAL_OUTPUT_FUNC = 1;
invoke(ictObj.Configuration,'configureoutputmode',NIFGEN_VAL_OUTPUT_ARB);