Generated Files

FPGA Interface C API Help

Edition Date: August 2014

Part Number: 372928H-01

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The generated FPGA Interface C API consists of the following files: a .h file, a .lvbitx file, NiFpga.h, and NiFpga.c. Unless you specify a custom prefix, the FPGA Interface C API Generator names the .h file, the .lvbitx file, and the constants in the .h file based on the name of the FPGA VI from which the application bitfile was compiled.

Generated .h File

The .h file is a C header file that contains all the constants required by function calls in your application. For example, NiFpga_Open requires the name of the .lvbitx file, provided by the generated *_Bitfile constant; and a digital signature of the FPGA bitstream in the bitfile, provided by the generated *_Signature constant. The other constants represent register offsets of each control, indicator, and FIFO in your VI, and other necessary information.

Generated .lvbitx Bitfile

This is a version of the original .lvbitx bitfile, renamed to match the prefix of the constants in the .h header file. NiFpga_Open must find this file in order to ensure the bitstream is downloaded to the FPGA.


This is a C header file. It is identical for all generated C APIs. It declares all the errors, types, constants, and functions needed to write an application. Most of these functions are defined in NiFpga.c.


This is a C source file that you must include in your application. It is identical for all generated C APIs. It defines all the functions your application can call. NiFpga.c loads and unloads the NiFpga library at runtime, and forwards function calls to that library.

Note Note  If you installed LabWindows/CVI support and are using LabWindows/CVI to develop your C application, you do not need NiFpga.h or NiFpga.c. Exclude them from the files to be generated and use the header and library files installed with LabWindows/CVI support.


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