What You Can Do with the FPGA Interface C API

FPGA Interface C API Help

Edition Date: August 2014

Part Number: 372928H-01

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The FPGA Interface C API enables C/C++ applications to interact directly with compiled LabVIEW FPGA VIs on RIO devices without using LabVIEW. C/C++ applications can download a VI to a RIO target, perform DMA data transfers, wait on and acknowledge interrupts, and read from and write to named controls and indicators using C function calls.

A C/C++ application created with the C API can run on the real-time processor of a CompactRIO or NI Single-Board RIO device, and interact with VIs running on the FPGA of the RIO system. Alternatively, a C/C++ application can run on the real-time processor of a PXI system or the processor of a Windows or Linux PC, and interact with VIs running on the FPGA of a PXI or PCI RIO device.

What You Cannot Do with the C API

The current version of the C API does not support the following features.

  • Scan Interface mode and I/O variables
  • Reading from and writing to controls, indicators, and FIFOs containing the following:
    • Fixed-point types
    • Floating-point types
    • Clusters
    • Arrays containing anything other than supported scalar types

  • The following methods callable from an Invoke Method node:
    • Read TEDS
    • NI 9802 methods
      • Mount SD Card
      • Unmount SD Card
    • NI FlexRIO Adapter Module methods
      • Control IO Module Power
      • IO Module Status
      • Redetect IO Module


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