LabVIEW FPGA Code (Digital Filter Design Toolkit)

In the Designing a Fixed-Point Filter tutorial, you learned the basics of designing a fixed-point filter using the LabVIEW Digital Filter Design Toolkit. After you design a fixed-point filter, you can generate LabVIEW field-programmable gate array (FPGA) code and implement the fixed-point filter on any NI Reconfigurable I/O (RIO) device.

Note  To generate LabVIEW FPGA code, you must install the LabVIEW FPGA Module and NI-RIO driver software with R Series support. To execute the FPGA code, you also need an FPGA target on which to run the code.

Note  If you did not complete the Designing a Fixed-Point Filter tutorial, refer to labview\examples\Digital Filter Design\Getting Started\Tutorials\Designing a Fixed-Point Filter\Designing a Fixed-Point Filter Part 6.vi for a completed version of the digital filter from that tutorial.

Generating LabVIEW FPGA Code

Complete the following steps to generate FPGA code from a fixed-point filter by using the DFD FXP Code Generator VI.

1. Place the DFD FXP Code Generator VI on the block diagram.
   
   Place  Find
   
   
2. Wire the filter out and error out outputs of the DFD FXP Modeling VI to the filter in and error in inputs of the DFD FXP Code Generator VI.
3. Click the polymorphic VI selector of the DFD FXP Code Generator VI and select LabVIEW FPGA Code from the pull-down menu.
4. Right-click the destination folder input of this VI and select Create»Control from the shortcut menu.
   
   A front panel control appears to the left of this VI. This control represents the destination folder in which this VI generates the code.
5. Right-click the filter name input of this VI and select Create»Control from the shortcut menu.
   
   A front panel control appears to the left of this VI. This control represents the filter name this VI uses for the code generation.
6. Right-click the lvproj path output of this VI and select Create»Indicator from the shortcut menu.
   
   A front panel indicator appears to the right of this VI. This indicator represents the path to the generated project file.
   
   The block diagram now resembles the following figure.

   

7. Display the front panel window and click the Browse button on the destination folder control to select the folder in which you this VI generates the code.
8. Click the filter name control and enter the name for the generated code.
9. Click the Run button to run the VI.
10. Select File»Save As and save this VI as Generating FPGA LabVIEW Code.vi in an easily accessible location

Note  Refer to labview\examples\Digital Filter Design\Getting Started\Tutorials\Generating Code\Generating FPGA Code.vi for a completed version of the digital filter from this part of the tutorial.

Implementing LabVIEW FPGA Code

After you generate LabVIEW FPGA code, you can implement the code on any National Instruments FPGA target, such as an NI-RIO device.

The Digital Filter Design Toolkit uses LabVIEW projects to manage the resulting LabVIEW FPGA code. The following figure displays an example project file that contains LabVIEW FPGA code.