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OCTOS is a compact real-time operating system (RTOS) featuring a preemptive kernel and an O(1) scheduler.

Currently, it supports only the ARM Cortex-M4 processor, but the system is designed to be extensible (seeCore/Arch).

• FreeRTOS-like preemptive scheduler
  • Round-Robin within priority level
  • "Cooperative" between priority level
  • Support scheduler suspension
• Basic Task Management
  • task_create,task_create_static,task_delete
  • task_delay,task_abort_delay
  • task_suspend,task_resume,task_resume_from_isr
  • task_yield,task_yield_from_isr
• Python-like Sync Primitives
  • Sema_t:Semaphore (ISR-compatible)
  • Mutex_t:Mutex (Support Priority Inheritance)
  • Cond_t:Condition (ISR-compatible)
  • Barrier_t:Barrier
  • Event_t:Event (ISR-compatible)
• Fexlible Inter-task Communication
  • Lightweight Task Notification (ISR-compatible)
  • Message Queue (ISR-compatible)

• GNU Arm Embedded Toolchain
• CMake
• OpenOCD (Optional)

# Start from project root directorymkdir buildcd buildcmake ..# or `cmake --build . --target flash` (OpenOCD and ST-LINK required)cmake --build. --target octos

# Inside Build Directory# Open a gdb server at :3333 (OpenOCD and ST-LINK required)cmake --build. --target gdbhost# Inside project root directory# Try input `oinfo` and `otasks` in gdbarm-none-eabi-gcc -x .gdbinit

• https://www.udemy.com/course/rtos-building-from-ground-up-on-arm-processors
• https://jyywiki.cn/OS/2024
• https://www.freertos.org
• https://github.com/Eplankton/mos-stm32
• https://github.com/FARLY7/embedded-cli