Blinky is the “Hello World” sample program of the embedded world. Most embedded Devices have no display for writing a message, but a led which could be turned on and off is almost always a part of a development board. Program files We start with the code given from the <prog/blinky> directory. prog/blinky ├── CMakeLists.txt ├── prj.conf └── src └── main.c CMakeLists.txt 1cmake_minimum_required(VERSION 3.20.0) 2find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE}) 3project(blinky) 4target_sources(app PRIVATE src/main.