IntrOS

Free, simple and tiny cooperative operating system (OS) designed for deeply embedded applications. Target: ARM Cortex-M, STM8, AVR8. It was inspired by the concept of a state machine. Procedure executed by the task (task state) doesn't have to be noreturn-type. It will be executed into an infinite loop. There's a dedicated function for immediate change the task state.

Features

• kernel can operate in cooperative (non-preemptive) mode only
• kernel can operate with 16, 32 or 64-bit timer counter
• kernel can operate in tick-less mode
• implemented basic protection using MPU (use nullptr, stack overflow)
• implemented functions for asynchronous communication with unmasked interrupt handlers
• spin locks
• once flags
• events
• signals with protection mask
• flags (any, all)
• barriers
• semaphores
• mutexes
• condition variables
• read/write locks
• memory pools
• raw buffers
• message queues
• mailbox queues
• event queues
• job queues
• timers (one-shot, periodic)
• hierarchical state machine
• c++ wrapper
• all documentation is contained within the source files
• examples and templates are in separate repositories on GitHub
• archival releases on sourceforge

Targets

ARM CM0(+), CM3, CM4(F), CM7

License

This project is licensed under the terms of MIT License (MIT).