Teensy 3.2
Arduino-cli
No Arduino-cli support yet.
Bare Metal Support
Pre-Requ
sudo apt-get install gcc-arm-none-eabi libusb-dev
Uploader
Clone, build and copy 'teensy_loader_cli' to /usr/local/bin
git clone https://github.com/PaulStoffregen/teensy_loader_cli
Template
git clone https://github.com/djmdjm/teensy3