Pre-release LabVIEW FPGA HDL Tools for use with the ni/flexrio repository.

Getting Started

Read the architecture/workflow background in Theory of Operation.

Prerequisites

From a target folder that contains nihdlsettings.py (for example, c:/dev/github8/flexrio-custom/targets/pxie-7986custom), install dependencies:

pip install -r requirements.txt

Required Files

Every target folder must contain:

• nihdlsettings.py — configures all paths, tool locations, and project settings via setter calls, and defines hook functions that run before/after each command.

The CLI will exit with an error if nihdlsettings.py is not found.

All nihdl commands are run from the target folder unless noted otherwise.

nihdl --help

nihdlsettings.py

Every target folder requires a nihdlsettings.py file. This file configures all settings via setter calls in pre_all() and can define hook functions to customize behavior before or after any command.

The CLI looks for nihdlsettings.py in the current working directory by default. Use --config path/to/nihdlsettings.py to point to a different location.

Relative paths passed to setters are automatically resolved from the nihdlsettings.py file's directory. Always use forward slashes (/) in paths — they work on both Windows and Linux and avoid Python backslash escape issues.

Hook Execution Order

For every command invocation, hooks run in this order:

pre_all(context)  →  pre_{command}(context)  →  command  →  post_{command}(context)  →  post_all(context)

Pre hooks (pre_all, pre_{command}) run with the working directory set to the nihdlsettings.py file's directory, so relative paths in setter calls resolve correctly. The command itself and post hooks run from the original working directory.

Context Object

Every hook receives a CommandContext with these attributes:

Attribute	Description
context.config	CommandConfiguration object — configure it in pre_all via setters.
context.command_name	Underscore-separated command name (for example, "gen_vivado").
context.command_kwargs	Dict of CLI arguments forwarded to the command function.
context.result	Return value of the command (available in post hooks only).
context.settings	Dict of generic overrides passed on the command line via repeated --set KEY=VALUE options. Values are strings; the settings file decides how to interpret them.

Passing Overrides from the Command Line (--set)

Every command accepts a repeatable --set KEY=VALUE option that surfaces to hooks as context.settings. This lets CI/CD pipelines and wrapper settings files pivot behavior without editing nihdlsettings.py or relying on environment variables:

nihdl gen-window --set output=shipping
nihdl gen-vivado --set input=objects --set verbose=1

A bare --set KEY (no =) is treated as KEY=true. Values are always strings, so the settings file owns any interpretation:

def pre_all(context):
    config = context.config
    if context.settings.get("output") == "shipping":
        config.set_lv_window_netlist_output_folder("netlist")  # checked-in folder
    else:
        config.set_lv_window_netlist_output_folder("objects/testLvWindowNetlist")

Minimal Example

def pre_all(context):
    """Called before every command. Configure all settings here."""
    config = context.config

    # Tools
    config.set_vivado_tools_path("C:/NIFPGA/programs/Vivado2021_1")
    config.set_vivado_tcl_scripts_folder("../common/TCL")

    # General Settings
    config.set_target_family("FlexRIO")
    config.set_base_target("PXIe-7903")
    config.set_dependencies("../../dependencies.toml")

    # Vivado Project Settings
    config.set_vivado_top_entity("SasquatchTopTemplate")
    config.set_fpga_part("xcvu11p-flgb2104-2-e")
    config.set_vivado_project_path("VivadoProject/MyProj.xpr")

    config.add_hdl_file_list("../../deps/flexrio/targets/pxie-7903/vivadoprojectdeps.txt")
    config.add_hdl_file_list("vivadoprojectsources.txt")
    # ... more settings ...

Per-Command Overrides

Use per-command hooks to override settings for specific commands:

def pre_all(context):
    config = context.config
    config.set_fpga_part("xcvu11p-flgb2104-2-e")
    # ... other settings ...

def pre_gen_vivado(context):
    # Override just for gen-vivado
    context.config.set_fpga_part("xcku060-ffva1156-2-e")
    context.config.set_vivado_project_path("VivadoProject/MyCustomProj.xpr")

Available Setters

General / Behavior

Setter	Description
set_target_family(value)	Device family (for example, "FlexRIO").
set_base_target(value)	Base target model (for example, "PXIe-7903").
set_dependencies(value)	Path to dependencies.toml file.
set_skip_vivado(flag)	Skip Vivado execution (validate only).
set_skip_modelsim(flag)	Skip ModelSim execution (validate only).

Tools

Setter	Description
set_vivado_tools_path(value)	Vivado installation root containing bin/vivado(.bat).
set_vivado_tcl_scripts_folder(value)	Folder with Vivado TCL Mako templates/scripts.
set_modelsim_tools_path(value)	ModelSim installation root directory.
set_xilinx_sim_lib_path(value)	Pre-compiled Xilinx simulation libraries path.
set_labview_path(value)	LabVIEW install folder used to locate createBitfile.exe for gen-lvbitx (for example, "C:\Program Files\National Instruments\LabVIEW 2023"). Optional — when unset, the latest installed LabVIEW (2023–2030) is auto-discovered under Program Files.

Vivado Project

Setter	Description
set_vivado_top_entity(value)	HDL top-level entity/module name.
set_fpga_part(value)	FPGA part string (for example, "xcku040-ffva1156-2-e").
set_vivado_project_path(value)	Relative path to Vivado .xpr file.
set_custom_constraints_file(value)	Optional custom XDC file path.
set_the_window_folder_input(value)	TheWindow input folder path. Optional — when unset, Window files are not integrated into the Vivado project.
add_hdl_file_list(path)	Append an HDL file list for Vivado project sources.
add_vhdl2008_file_list(path)	Append a VHDL-2008 file list (compiled with -2008 flag).
add_constraints_template(path)	Append a constraints template path.
add_vivado_project_constraints_file(path)	Append a Vivado project constraints file.

ModelSim Project

Setter	Description
set_modelsim_project_path(value)	Relative path to ModelSim .mpf file.
add_modelsim_file_list(path)	Append a ModelSim file list (overrides Vivado lists).

LV Window Netlist

Setter	Description
set_vivado_project_export_xpr(value)	Path to LabVIEW Vivado Project Export .xpr.
set_the_window_folder_output(value)	Output folder for extracted TheWindow files.

LV FPGA Target

Setter	Description
set_custom_io_csv(value)	Custom I/O CSV definition path.
set_boardio_output(value)	Output boardio.xml path.
set_clock_output(value)	Output clock XML path.
set_window_vhdl_output_folder(value)	Output folder for generated Window HDL files. Also used for BoardIOSignalAssignmentsExample.vhd.
set_include_board_io_on_lv_window(flag)	Include standard board I/O ports on the LV Window.
set_include_custom_io_on_lv_window(flag)	Include custom I/O ports on the LV Window.
set_lv_target_plugin_folder(value)	Output folder for generated target plugin.
set_lv_target_name(value)	Display name for custom target.
set_lv_target_guid(value)	GUID for custom LabVIEW FPGA target plugin.
set_lv_target_install_folder(value)	Destination path for install-target.
set_lv_target_menus_folder(value)	Source folder for target plugin menu assets.
set_lv_target_info_ini(value)	Path to TargetInfo.ini source.
set_lv_target_exclude_files(value)	Exclusion list for plugin content copying.
set_num_hdl_registers(value)	Number of HDL registers.
set_max_hdl_reg_offset(value)	Maximum HDL register byte offset.
add_window_vhdl_template(path)	Append a Window VHDL Mako template.
add_lv_target_xml_template(path)	Append a target resource XML Mako template.
add_lv_target_constraints_file(path)	Append a LV target constraints file.

CLIP Migration

Setter	Description
set_clip_input_xml_path(value)	Input CLIP XML path.
set_output_csv_path(value)	Output CSV path for CLIP signals.
set_clip_hdl_path(value)	Input CLIP top-level HDL path.
set_clip_inst_example_path(value)	Output HDL instantiation example file.
set_clip_instance_path(value)	HDL hierarchy instance path for constraint rewriting.
set_updated_xdc_folder(value)	Output folder for migrated CLIP XDC files.
set_clip_to_window_signal_definitions(value)	Output signal-definition helper file.
add_clip_xdc_path(path)	Append a CLIP XDC constraint file.

Per-Command Hooks

Define pre_{command} / post_{command} functions using underscore-separated command names:

def pre_check_vivado(context):
    """Runs before check-vivado."""
    pass

def post_compile_vivado(context):
    """Runs after compile-vivado. context.result has the return value."""
    pass

Scaffold

A default template is provided at labview_fpga_hdl_tools/nihdlsettings_default.py. Copy it to your target folder as nihdlsettings.py and customize as needed.

Command Reference

The current CLI surface is defined in labview_fpga_hdl_tools/main.py.

Workspace Setup

Command	Purpose	Options
install-deps	Install GitHub dependencies from dependencies.toml.	--delete, --pre, --latest, --config

Vivado

Command	Purpose	Options
gen-vivado	Create or update the Vivado project from settings + file lists.	--overwrite (-o), --update (-u), --config
launch-vivado	Launch the configured Vivado project.	--config
check-vivado	Run Vivado RTL elaboration syntax/hierarchy check.	--config
compile-vivado	Run Vivado compile flow to bitstream generation.	--config

HDL Tools

Command	Purpose	Options
gen-window	Extract TheWindow netlist/support files from a Vivado Project Export.	--config
gen-hdl	Generate Window VHDL outputs only (automatically run in gen-vivado).	--config
gen-xdc	Generate XDC files from constraint templates/macros (automatically run in gen-vivado).	--config
gen-lvbitx	Build a .lvbitx from Vivado implementation output (automatically run in compile-vivado).	--config

LabVIEW FPGA Target

Command	Purpose	Options
gen-guid	Generate a new GUID for LVTargetGUID.	--config
gen-target	Generate full LabVIEW FPGA target support outputs (XML, VHDL stubs, plugin content).	--config
install-target	Install generated LabVIEW FPGA target plugin files.	--config

ModelSim

Command	Purpose	Options
gen-modelsim	Create a ModelSim project for HDL simulation.	--overwrite (-o), --config
launch-modelsim	Launch ModelSim with the current project.	--batch, --config
sim-modelsim	Run a ModelSim simulation with a custom .do file.	--do-file, --config

CLIP Migration

Command	Purpose	Options
migrate-clip	Migrate CLIP assets into top-level HDL workflow artifacts.	--config

Common Command Notes

• All commands require nihdlsettings.py in the current directory (or specified via --config).
• Use set_skip_vivado(True) / set_skip_modelsim(True) in nihdlsettings.py to validate settings without launching external tools.
• install-deps and gen-guid do not need most settings (but still require nihdlsettings.py).
• install-deps treats a pre-release specifier in dependencies.toml (for example, ~=26.2.0.dev0) as opting that dependency into pre-release matching even without global --pre.
• gen-lvbitx is intended to run from VivadoProject/.runs/impl_1 (it warns if run elsewhere).
• gen-lvbitx locates createBitfile.exe from the LabVIEW install. By default it auto-discovers the latest installed LabVIEW (2023–2030) under Program Files; set set_labview_path in nihdlsettings.py to override (for example, "C:\Program Files\National Instruments\LabVIEW 2023").
• gen-modelsim uses vcom -autoorder -2008 to compile all VHDL files in a single invocation with automatic dependency resolution. No manual compile-order file is needed.
• launch-modelsim defaults to GUI mode; use --batch for headless simulation.

Per-Command Setting Requirements

Command	Required Settings (normal run)	Notes
install-deps	dependencies	Does not use other settings.
gen-vivado	vivado_project_path, top_level_entity, fpga_part, hdl_file_lists	Non-skip adds vivado_tools_path. If the_window_folder_input is set, Window files are integrated.
launch-vivado	vivado_tools_path, vivado_project_path	Also requires existing project .xpr file.
check-vivado	vivado_project_path, top_level_entity, fpga_part, vivado_tcl_scripts_folder	Non-skip adds vivado_tools_path and existing project .xpr file.
compile-vivado	vivado_project_path, vivado_tcl_scripts_folder	Non-skip adds vivado_tools_path and existing project .xpr file.
gen-window	vivado_project_export_xpr, the_window_folder_output, vivado_tools_path	When skip_vivado is set, Vivado is not launched.
gen-hdl	window_vhdl_templates, window_vhdl_output_folder	custom_io_csv required when include_custom_io_on_lv_window=True.
gen-xdc	None enforced by a dedicated validator	For useful output, set constraints_templates.
gen-lvbitx	top_level_entity	Locates createBitfile.exe from labview_path when set, otherwise auto-discovers the latest installed LabVIEW (2023–2030) under Program Files. Uses top_level_entity to derive filenames.
gen-guid	None	Does not use any settings.
gen-target	target_family, base_target, window_vhdl_templates, window_vhdl_output_folder, lv_target_plugin_folder, lv_target_name, lv_target_guid, boardio_output, clock_output, lv_target_xml_templates, hdl_file_lists	custom_io_csv required when include_custom_io_on_lv_window=True.
install-target	lv_target_install_folder, lv_target_name, lv_target_plugin_folder	Install folder and plugin folder must exist.
gen-modelsim	top_level_entity, hdl_file_lists, modelsim_tools_path	Uses modelsim_file_lists if set, otherwise hdl_file_lists.
launch-modelsim	top_level_entity, modelsim_tools_path	Requires existing ModelSim project directory (run gen-modelsim first).
sim-modelsim	top_level_entity, modelsim_tools_path	Requires existing ModelSim project directory.
migrate-clip	clip_input_xml_path, output_csv_path, clip_hdl_path, clip_inst_example_path, clip_to_window_signal_definitions	If clip_xdc_paths is set, clip_instance_path and updated_xdc_folder are also required.

Example Usage

# Create or refresh Vivado project
nihdl gen-vivado --overwrite

# Fast RTL syntax/hierarchy check
nihdl check-vivado

# Full compile to bitstream
nihdl compile-vivado

# Generate custom target support artifacts
nihdl gen-target

# Create ModelSim project and compile all VHDL
nihdl gen-modelsim

# Launch ModelSim GUI
nihdl launch-modelsim

# Run ModelSim simulation headless
nihdl launch-modelsim --batch

# Install dependencies from dependencies.toml
nihdl install-deps

To validate settings without launching external tools, add this to your nihdlsettings.py:

def pre_all(context):
    config = context.config
    # ... configure settings ...
    config.set_skip_vivado(True)
    config.set_skip_modelsim(True)