Firefly

Firefly is a hand-written preemptive, priority based real-time operating system with mutex, semaphore, and queue data structures implemented. It primarily targets the STM32F401CCU6 micro-controller on the Cortex M architecture and was implemented in C & assembly.

Motivation

I am developing an Autonomous Drone & Plane this summer! While I could just as easily use an open source real time operating system, the idea behind this project is to learn the foundation of embedded engineering & own the whole stack!

Link

Read the full technical guide on my website!

Build

Dependencies for Arch Linux:

sudo pacman -S arm-none-eabi-gcc arm-none-eabi-newlib cmake openocd

Then attach ST-Link to corresponding SWDIO, SDCLK, NRST, 3.3V, & GND on STM32.

From root, here is how to blink the light:

cmake -B build -DBUILD_EXAMPLES=ON
cmake --build build
./tools/flash.sh

To flash the Real-Time OS:

cmake -B build -DBUILD_EXAMPLES=ON
cmake --build build
./tools/flash.sh examples/rtos_demo/rtos_demo

AI Policy

I believe AI is an exceptional tool but not a substitute for learning. Therefore, AI suggestions were considered, evaluated, and applied to the file structure, some implementation details, and for general proof reading. However, NO code was generated was AI, every line was typed & extensively thought about by me.