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Linux
1.1 Installation
1. Zephyr Setup
2

Install

1) Install dependencies

I am going to setup for Arch Linux but the steps are similar for all the other Linux distributions. You can find the official getting started guide with steps for Ubuntu here.

  • Upgrade the OS
$ sudo pacman -Syyu
  • Installing the packages
$ sudo pacman -S base-devel git cmake ninja gperf ccache dfu-util dtc wget python python-pip python-setuptools xz file make gcc multilib-devel sdl2 tk

Verify the versions of main dependencies

$ cmake --version
$ python3 --version
$ dtc --version

2) Clone Zephyr

  • Install west tool via pip
$ pip3 install west
  • Get Zephyr source code
$ mkdir ~/zephyrproject
$ west init ~/zephyrproject
$ cd ~/zephyrproject
$ west update
  • Export Zephyr Cmake package
$ west zephyr-export
  • Install Zephyr python dependencies
$ pip3 install -r zephyr/scripts/requirements.txt

3) Cloning the Zephyr SDK

I will be using the /opt folder to store the Zephyr SDK. I already have write access. If you get any errors of permission denied. I suggest you to chown the /opt folder.

  • Download and Verify SDK
$ cd /opt
$ wget https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v0.15.2/zephyr-sdk-0.15.2_linux-x86_64.tar.gz
$ wget -O - https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v0.15.2/sha256.sum | shasum --check --ignore-missing
  • Extract the SDK
$ tar xvf zephyr-sdk-0.15.2_linux-x86_64.tar.gz
  • Run setup script
$ cd zephyr-sdk-0.15.2
$ ./setup.sh

{:.note}

This setup script needs to be run only once or whenever you change the location of the SDK folder.

  • Install udev rules
$ sudo cp ~/zephyr-sdk-0.15.2/sysroots/x86_64-pokysdk-linux/usr/share/openocd/contrib/60-openocd.rules /etc/udev/rules.d
$ sudo udevadm control --reload

3) Building the Hello, World

{:.note}

Thie list of supproted boards can be found here. I am going to use ESP32 for this example.

cd ~/zephyrproject/zephyr
$ west build -p always -b esp32 samples/hello_world/

The -p option does a pristine build. It is used to build when there is any changes done to the CMake.

A successful build looks like this success_build_hello_world Now flash the board with

$ west flash

To open the serial monitor

$ west espressif monitor

You should see the similar output hello_world_success_output

4) Building the blinky

Now, let's try to blink the builtin LED on ESP32. The sample is in zephyr/samples/basic/blinky

$ west build -p -b esp32 samples/basic/blinky

If you encounter build errors like this blinky_build_error It means that we need to add an overlay file with the board support. This file can be added for any unsupported board with the <board-name>.overlay.
Create an esp32.overlay file in zephyr/samples/basic/blinky/ and add the following contents

/ {
     aliases {
             led0 = &myled0;
     };

     leds {
             compatible = "gpio-leds";
             myled0: led_0 {
                     gpios = <&gpio0 0 GPIO_ACTIVE_LOW>;
             };
     };
};

It will blink the LED connected to GPIO 0 (BUILTIN_LED). Now try to build

$ west build -p -b esp32 samples/basic/blinky

And flash it with

$ west flash

The board will start to blink