Devlog PicoOS #3: Colors, SDK, and an Alternative C Kernel

What is New

Application Library (SDK)

To stop rewriting core system code for every new feature, PicoOS now features a minimalist SDK. This application library standardizes how programs interface with the OS for rendering and input handling, making the codebase modular.

ANSI Color Support

PicoOS now supports standard ANSI color escape sequences. This brings color to the terminal interface without bloating the system, allowing for better visual hierarchy and cleaner error reporting.

Technical Friction: Refactoring the ls Command

Integrating older, hardcoded features into the new standardized SDK proved to be a real headache.

The biggest friction happened while adapting the ls command to the new library. Originally, the file listing system was deeply intertwined with the main loop and bypassed any formal API. Forcing it to fit into the new application structure broke the output formatting and data piping. It took a lot of tedious refactoring to abstract the file system calls into the SDK so that ls could run as a standard, isolated application while maintaining its output format.

Future Roadmap

Text Editor: poe

The next native tool will be poe (PicoOS Editor). This minimalist text editor will run directly on top of the SDK, allowing basic file editing on the go.

Parallel Track: A C Version

The MicroPython version is not going anywhere and will remain active. However, as a C developer who loves low-level programming, a parallel version of PicoOS written entirely in C will start soon. This alternative kernel will run closer to the metal, offering absolute memory control, optimal performance on the RP2350, and a pure bare-metal experience.