ChibiOS/RT

1.3.4

Author:

Giovanni Di Sirio (gdisirio@users.sourceforge.net).

Chibi ?

I didn't want a serious name for this project. It is the Japanese word for small as in small child. So ChibiOS/RT (ちびOS/RT) means small Real Time Operating System. Source Wikipedia.

Features

• Free software, GPL3 licensed. Stable releases include a exception clause to the GPL.
• Designed for realtime applications.
• Easily portable.
• Preemptive scheduling.
• 128 priority levels. Multiple threads at the same priority level allowed.
• Round robin scheduling for threads at the same priority level.
• Offers threads, virtual timers, semaphores, mutexes, condvars, event flags, messages, mailboxes, I/O queues.
• No static setup at compile time, there is no need to configure a maximum number of all the above objects.
• PC simulator target included, the development can be done on the PC using MinGW.
  Timers, I/O channels and other HW resources are simulated in a Win32 process and the application code does not need to be aware of it. MinGW demo available.
• No *need* for a memory allocator, all the kernel structures are static and declaratively allocated.
• Optional, thread safe, Heap Allocator subsystem.
• Optional, thread safe, Memory Pools Allocator subsystem.
• Blocking and non blocking I/O channels with timeout and events generation capability.
• Minimal system requirements: about 8KiB ROM with all options enabled and speed optimizations on. The size can shrink under 2KiB by disabling the the unused subsystems and optimizing for size.
• Almost totally written in C with little ASM code required for ports.

Related pages

• License and F.A.Q.
• Project Goals
• Concepts and Architecture
• Articles and Code Samples
• Test Suite