ChibiOS/RT is a free and efficient RTOS designed for deeply embedded applications. It offers a comprehensive set of kernel primitives and supports many architectures: ARM7, Cortex-M0, Cortex-M3, Cortex-M4, PowerPC e200z, STM8, AVR, MSP430, ColdFire, H8S, x86.


  • Tiny memory footprint, high performance, easily portable, clean and readable.
  • Preemptive kernel, 128 priority levels, reliable static architecture.
  • Kernel support for Semaphores, Mutexes, CondVars, Messages, Event Flags, Mailboxes, Virtual Timers.
  • IRQ abstraction, support for non-OS fast IRQ sources (zero latency buzzword).
  • Support for ARM, ARM-CM0, ARM-CM3, ARM-CM4, PowerPC, STM8, MSP430, AVR, ColdFire, H8S, Linux/Win32/MacOS simulators.
  • HAL component makes applications portable across the supported platforms.
  • HAL support for Port, Serial, ADC, CAN, DAC, EXT, GPT, I2C, I2S, ICU, MAC, MMC, PWM, RTC, SDC, SPI, UART, USB, WDG device driver models.
  • Support for the uIP and lwIP TCP/IP stacks (demo included).
  • Support for the FatFS file system library (demo included).

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User Reviews

  • Fast and support various of platforms. The author has beening working on this project for years. The forum is active.

    1 user found this review helpful.
  • The best RTOS i've ever used.

    1 user found this review helpful.
  • Well designed RTOS with a good set of ready to use drivers.

    1 user found this review helpful.
  • First RTOS I tried, and I haven't felt any desire to go looking for a different one. I've found it to be well written and importantly well documented.

    1 user found this review helpful.
  • Excellent design, elegant and nimble. It is well structured.

    2 users found this review helpful.
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Additional Project Details



Intended Audience

Information Technology, Science/Research, Education, Telecommunications Industry, Developers, Automotive

User Interface

Non-interactive (Daemon), Console/Terminal

Programming Language

C++, Assembly, C