This example is based on the Zephyr button example, but targets the Teensy 4.0 Development Board.
Before we can start developing, we first need to set up the Zephyr development tools. These instructions are based on the information found in the Zephyr Getting Started Guide. More recent versions of the Zephyr SDK can be found here.
sudo apt update && sudo apt install --no-install-recommends git cmake ninja-build gperf \
ccache dfu-util device-tree-compiler wget \
python3-dev python3-pip python3-setuptools python3-tk python3-wheel xz-utils file \
make gcc gcc-multilib g++-multilib libsdl2-dev libmagic1
export SDK_VERSION="0.16.8"
wget "https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v${SDK_VERSION}/zephyr-sdk-${SDK_VERSION}_linux-x86_64.tar.xz"
sudo tar xf "zephyr-sdk-${SDK_VERSION}_linux-x86_64.tar.xz" -C /opt
rm "zephyr-sdk-${SDK_VERSION}_linux-x86_64.tar.xz"
"/opt/zephyr-sdk-${SDK_VERSION}/setup.sh"
sudo cp "/opt/zephyr-sdk-${SDK_VERSION}/sysroots/x86_64-pokysdk-linux/usr/share/openocd/contrib/60-openocd.rules" /etc/udev/rules.d
sudo udevadm control --reload
sudo apt update && sudo apt install --no-install-recommends python3-venv
python3 -m venv --upgrade-deps "$HOME/.local/bin/zephyr-venv"
. "$HOME/.local/bin/zephyr-venv/bin/activate"
python3 -m pip install west
git clone https://github.com/chprat/zephyr-led-button.git && cd zephyr-led-button
west init -l zephyr-led-button
west update
west zephyr-export
pip install -r zephyr/scripts/requirements.txt
sudo apt update && sudo apt install --no-install-recommends libusb-dev
git clone https://github.com/PaulStoffregen/teensy_loader_cli "$HOME/.local/bin/teensy_loader_cli_repo"
pushd "$HOME/.local/bin/teensy_loader_cli_repo"
make
ln -s "$HOME/.local/bin/teensy_loader_cli_repo/teensy_loader_cli" "$HOME/.local/bin"
wget https://www.pjrc.com/teensy/00-teensy.rules
sudo cp 00-teensy.rules /etc/udev/rules.d
sudo udevadm control --reload
popd
west build --board teensy40 --pristine always zephyr-led-button/
west flash