NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 32-bit microcontroller environments, the primary governing standards in NuttX are Posix and ANSI standards.


  • Standards Compliant.
  • Core Task Management.
  • Modular, micro-kernel.
  • Fully pre-emptible.
  • Naturally scalable.
  • Highly configurable.
  • Easily extensible to new processor architectures, SoC architecture, or board architectures. See Porting Guide.
  • FIFO and round-robin scheduling.
  • Realtime, deterministic, with support for priority inheritance.
  • POSIX/ANSI-like task controls, named message queues, counting semaphores, clocks/timers, signals, pthreads, environment variables, filesystem.
  • VxWorks-like task management and watchdog timers.
  • BSD socket interface.
  • Extensions to manage pre-emption.
  • Optional tasks with address environments (Processes).
  • Inheritable


Source code:

License: BSD

NuttX Demo Projects


PX4 is an independent, open-source, open-hardware project aiming at providing a high-end autopilot to the academic, hobby and industrial communities (BSD licensed) at low costs and high availability.

HOWTO: Installing NuttX on the STM32F4 Discovery board (using Debian Linux)

Installed the NuttX RTOS on a new STM32F4 Discovery board.

Running NuttX on a less than U$2.00 board

Running NuttX on a STM32 Minimum System Development Board.

CC3200 development on Linux with NuttX

This article shows how to compile and install NuttX real-time OS to CC3200 launchpad using Fedora (24) Linux.

NuttX Demo Boards


The STM32F4DISCOVERY kit leverages the capabilities of the STM32F407 high performance microcontrollers, to allow users to easily develop applications featuring...


The STM32 Nucleo board provides an affordable and flexible way for users to try out new concepts and build prototypes with the STM32 microcontroller, choosing...

C3200 LaunchPad

The SimpleLink™ Wi-Fi® CC3200 LaunchPad™ development kit (with QFN-packaged device) is an evaluation development platform for the CC3200 wireless...

NuttX Rating

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NuttX Platforms

  • ARM
  • ARM Cortex-A5
  • ARM Cortex-M3
  • ARM Cortex-M4
  • ARM7
  • ARM9
  • AVR
  • AVR32
  • 8051
  • PIC
  • PIC32
  • x86
  • MIPS
  • Xtensa
  • RISC-V
  • Freescale HCS12
  • Zilog

NuttX Resources