SKRTOS_sparrow is a modular Real-Time Operating System (RTOS) microkernel designed specifically for embedded systems, educational purposes, and architectural research. This project provides essential resources, tutorials, and a flexible architecture that enhances the development of embedded applications.

Key Features

• Modular Architecture: The kernel's design supports various architectures through the arch directory, making it adaptable to different hardware configurations.
• Diverse Board Support: The boards directory includes projects that transplant the kernel onto various development boards, facilitating easy integration into existing setups.
• Comprehensive Documentation: The docs folder offers extensive resources, including kernel design details and source code to streamline understanding and implementation.
• Versatile Library: A dedicated lib directory contains a library of data structures and algorithms for efficient program development.
• Networking Support: The net section implements the TCP/IP protocol, enabling robust communication features in applications.
• File System Implementation: The kernel includes a basic file system within the FileSystm directory, ensuring foundational file management capabilities.

Tutorial Availability

To assist developers and learners in writing a microkernel, SKRTOS_sparrow offers tutorials available in both Chinese and English.

• Chinese Tutorial: skaiui2/SKRTOS_sparrow at study
• English Tutorial: Let’s write a Real-Time Operating System (RTOS) (Part 1: Memory management)

Kernel Versions

The SKRTOS_sparrow kernel has four distinct versions catering to different needs:

1. Table Version: Supports fewer than 32 tasks with no shared priorities—ideal for resource-limited conditions.
2. Linked List Version: Allows an unlimited number of tasks, with a modifiable interface based on the Table version.
3. Red-Black Tree Version: Supports tasks with the same priority but lacks time slice functionality, similar to the Linked List version.
4. Response EDF Version: Enhances traditional EDF algorithms, tailored for scenarios requiring predictability and periodicity, while supporting the ARM Cortex A7 architecture.

Application Scope

• Table Version: Suitable for educational only scenarios with limited resources.
• Linked List Version: Versatile and ideal for a wide range of applications.
• Red-Black Tree Version: Designed for high-concurrency scenarios where frequent task searches, inserts, and deletes are required.
• Response EDF Version: Focused on periodic and predictable task scheduling, currently in experimental phases.

Optimization Goals per Version

• Table Version: Streamlined for efficiency using extensive bit operations and optimized code.
• Linked List Version: General purpose optimization.
• Red-Black Tree Version: Emphasizes high concurrency with robust locking mechanisms.
• Response EDF Version: Aims to enhance periodicity and predictability in scheduling algorithms as functionality develops.

Documentation Structure

The documentation is meticulously organized:

• Kernel Design Instructions
• Arithmetic and Program Optimization Insights
• Code Design Styles and Programming Concepts
• Kernel Implementation Details
• Network Protocol Implementations

Explore SKRTOS_sparrow to accelerate embedded system development with a modular RTOS that supports both learning and practical application in real-time environments.