2.7. Environment Variables

ModelMaker finds the TI compiler tools through environment variables. They are needed only to compile a model for a device; training and quantization work without them.

Warning

Set the variable for your target device before running an example, otherwise the compilation step fails.

2.7.1. How the Paths Are Resolved

Each variable below has a default under TOOLS_PATH. If a variable is unset, ModelMaker uses <TOOLS_PATH>/<default folder name>.

Variable	Default	Purpose
`TOOLS_PATH`	`~/ti` (`$HOME/ti`)	Parent folder searched for the compilers below
`C2000_CG_ROOT`	`$TOOLS_PATH/ti-cgt-c2000_25.11.1.LTS`	TI C2000 CGT (`bin/cl2000`) for F28x devices
`CG_TOOL_ROOT`	`$TOOLS_PATH/ti-cgt-c29_2.2.1.LTS`	TI C29 Clang (`bin/c29clang`) for F29x devices
`ARM_LLVM_CGT_PATH`	`$TOOLS_PATH/ti-cgt-armllvm_5.1.1.LTS`	TI Arm Clang (`bin/tiarmclang`) for MSPM0, MSPM33C, AM13, AM26x and the CC13xx/CC27xx/CC35xx connectivity devices
`IWRL6432_ARM_LLVM_CGT_PATH`	`$TOOLS_PATH/ti-cgt-armllvm_5.1.1.LTS`	Arm Clang for the IWRL6432 radar device (radar tasks only)

The defaults are in the constants.py of the ModelMaker modules (tinyml_modelmaker/ai_modules/timeseries, audio, radar). If you install a compiler in the default folder name under ~/ti you do not need to set anything. The compiler versions above are the ones 1.5.0 is built against.

2.7.2. Which Variable for Which Device

Target devices	Variable
F28P55, F28P65, F2837, F28004, F28003, other C2000 F28x	`C2000_CG_ROOT`
F29H85, F29P58, F29P32	`CG_TOOL_ROOT`
MSPM0G3507, MSPM0G3519, MSPM0G5187, MSPM33C32/34, AM13E2, AM263, AM263P, AM261, CC2755, CC2745, CC1312, CC1314, CC1352, CC1354, CC35X1	`ARM_LLVM_CGT_PATH`
IWRL6432	`IWRL6432_ARM_LLVM_CGT_PATH`

See Supported Devices for the full device list.

2.7.3. Setting Variables

Per session, or add to ~/.bashrc / ~/.zshrc for permanence:

export TOOLS_PATH=$HOME/ti
export C2000_CG_ROOT=$HOME/ti/ti-cgt-c2000_25.11.1.LTS
export CG_TOOL_ROOT=$HOME/ti/ti-cgt-c29_2.2.1.LTS
export ARM_LLVM_CGT_PATH=$HOME/ti/ti-cgt-armllvm_5.1.1.LTS

$env:C2000_CG_ROOT = "C:\ti\ti-cgt-c2000_25.11.1.LTS"
# Permanent for the current user:
[Environment]::SetEnvironmentVariable("C2000_CG_ROOT", "C:\ti\ti-cgt-c2000_25.11.1.LTS", "User")

set C2000_CG_ROOT=C:\ti\ti-cgt-c2000_25.11.1.LTS

2.7.4. Installing the Compilers

C2000 CGT: https://www.ti.com/tool/C2000-CGT (version 25.11.1.LTS)
TI Arm Clang: https://www.ti.com/tool/ARM-CGT (version 5.1.1.LTS)
TI C29 Clang: from TI’s compiler download page (version 2.2.1.LTS)
Code Composer Studio also installs compilers under <CCS_INSTALL>/tools/compiler/; point the variables there.

Install them with the vendor installer to any folder, then either set the variable or install into ~/ti.

2.7.5. Verifying

$C2000_CG_ROOT/bin/cl2000 --version
$ARM_LLVM_CGT_PATH/bin/tiarmclang --version

2.7.6. Troubleshooting

Compiler not found during compilation: Check the variable points at the folder that contains bin/ (ls $C2000_CG_ROOT/bin).
Works in a terminal but not from an IDE: The IDE may not inherit your shell variables; set them in its run configuration.
Other versions: The defaults name specific versions. Other versions may work but are not what 1.5.0 was validated with.

Also, ModelMaker sets PYTORCH_ENABLE_MPS_FALLBACK=1 itself on startup (relevant to macOS; see macOS Setup).