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FPGA Interface C API 2024 Q2 Known Issues

Updated Oct 20, 2025

Overview

This document contains the FPGA Interface C API known issues that were discovered before and since the release of FPGA Interface C API 2024 Q2. Known issues are performance issues or technical bugs that NI has acknowledged exist within this version of the product.

 

Not every issue known to NI appears on this list; it is intended to show the most severe and common issues that you may encounter and provide workarounds when possible. Other technical issues that you may encounter could occur through normal product use or system compatibility issues. You may find more information on these issues in NI’s Product Documentation, Knowledgebase, or Community; see Additional Resources.

Bug Number

Legacy ID

Description

Details

NI-RIO Fails to Install on Linux Kernel 5.13 or Later with Fatal Error

When installing certain NI drivers onto a Linux system using kernel version 5.13 or later, the installation fails with an error about not finding all the dependencies it needs such as: /var/lib/dkms/nikal/21.5.0f129/build/nikal.c:32:16: fatal error: config/modversions.h: No such file or directory

Workaround:

Reattempt the installation after adding modversions.h to the kernel headers for your current system kernel. For example:sudo touch /usr/src/linux-headers-$(uname -r)/include/config/modversions.h

Reported Version:

NI-RIO: 21.3

Resolved Version:

N/A

Added:

May 10, 2022
3316026

When using the FPGA Interface C API, certain Double to Fixed-Point conversions can output incorrect data

When using the FPGA Interface C API, Double to Fixed-Point conversions for values close to zero can output incorrect data.

Workaround:

There is currently no known workaround for this issue.

Reported Version:

FPGA Interface C API: 2024 Q2

Resolved Version:

N/A

Added:

Oct 17, 2025

Final Time Issue Listed

Issues found in this section will not be listed in future known issues documents for this product.

There are currently no issues to list.

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Glossary of Terms

 

  • Bug ID - When an issue is reported to NI, you may be given this ID or find it on ni.com.  You may also find IDs posted by NI on the discussion forums or in KnowledgeBase articles.
  • Legacy ID – An older issue ID that refers to the same issue.  You may instead find this issue ID in older known issues documents.
  • Description - A few sentences which describe the problem. The brief description given does not necessarily describe the problem in full detail.
  • Workaround - Possible ways to work around the problem.
  • Reported Version - The earliest version in which the issue was reported.
  • Resolved Version - Version in which the issue was resolved or was no longer applicable. "N/A" indicates that the issue has not been resolved.
  • Date Added - The date the issue was added to the document (not the reported date).