How can the myRIO communicate with a host Linux machine via shared variables or other communication?
I think that Linux does not support hosting Shared Variable Engine (SVE), however, could the Linux host deploy a shared variable library to the cRIO or myRIO, and the Linux OS just communicates with it?

• First, we should verify if our Linux distribution is supported. To do this you can check the following documents:
  • Install LabVIEW on Linux Operating Systems
  • LabVIEW and Linux OS Compatibility
  • NI Hardware and Software Operating System Compatibility
• To solve this we must consider the Shared Variables are not supported on Linux Systems, you can refer to the table 1 on the document: Using the LabVIEW Shared Variable in the Related Links section.
• Seeing the NI-RIO Driver 17.0 for Linux Readme, we can find:

"In order to use NI-RIO on Linux, you need a Windows system to develop your LabVIEW FPGA application. You must compile a bitfile, generate headers with the FPGA Interface C API Generator or FPGA Interface Python API, and then move the application to your Linux system. Refer to the "Using the NI-RIO Driver and FPGA Interface C API"  and "Using the NI-RIO Driver and FPGA Interface Python API" sections for more information.


Using the NI-RIO Driver and FPGA Interface C API

You must begin development on a computer running Windows. Use LabVIEW FPGA to develop and build an FPGA VI that runs on a RIO device. Use the FPGA Interface C API Generator to create the C source files for your application. Download the latest version of the FPGA Interface C API Generator then copy the generated files to the Linux machine to begin development of C/C++ code for your application. For information about using the FPGA Interface C API, visit the FPGA C Interface help.
To find the RIO device you are using in your application, use the command "lsni -v" to list information on all NI devices in the system."

 

So, the option to communicate your cRIO or MyRIO with the Linux host will be using the cRIO / MyRIO FPGA to communicate with a C program on Linux. We can summarize in these steps:

• Use LabVIEW to create your Main cRIO / MyRIO Program and pass the information to the FPGA. You can check these documents in the Related Links Section:

  • Communication Between the FPGA, Real-Time Processor, and Distributed Systems

  • Understanding Communication Options Between the Windows HMI, RT Processor, and FPGA

• Use LabVIEW to create an FPGA program that gets data from the Main RT program and sent it to the Linux Host. To do this you can check this document:

  • Understanding Communication Options Between the Windows HMI, RT Processor, and FPGA

• Use LabVIEW FPGA Interface C API to create a C program to use it on Linux to read the cRIO or MyRIO FPGA. To do this you can check these documents:

  • Introduction to the FPGA Interface C API    

  • NI myRIO C and C++ Development Support and Examples

The next picture summarize the solution: