Micriµm: µC/OS-II Real-Time Operating System Kernel Overview

Yiying — Tue, 24 Jun 2014 22:56:07 GMT

Current Revision posted to Documents by Yiying on 6/24/2014 10:56:07 PM

Ordering Information

Key Features

Technical Specifications

Supported Devices

Video

Technical Documents

Overview

µC/OS-II, the Real-Time Kernel, is a portable, ROMable, scalable, preemptive, real-time deterministic multitasking kernel for microprocessors, microcontrollers and DSPs. Offering unprecedented ease-of-use, µC/OS-II is delivered with complete source code and in-depth documentation. Most of µC/OS-II is written in highly portable ANSI C, with target processor specific code written in assembly language. Assembly language is kept to a minimum to make µC/OS-II easy to be ported to other processors. To date, µC/OS-II has been ported to over 40 different processor architectures, ranging from 8- to 64-bit CPUs. µC/OS-II can manage up to 250 application tasks and provides the services including: semaphores; event flags; mutual-exclusion semaphores that eliminate unbounded priority inversions; message mailboxes and queues; task, time and timer management, and more.

μC/OS-II’s footprint can be scaled (between 5 Kbytes to 24 Kbytes) to only contain the features required for a specific application. Depending on the processor, μC/OS-II can be reduced to as little as 2K bytes of code space and 300 bytes of data space (excluding stacks). The execution time for most services provided by μC/OS-II is both constant and deterministic; execution times do not depend on the number of tasks running in the application.

A validation suite has been developed for μC/OS-II and provides all the documentation necessary to prove that μC/OS-II is suitable for Safety Critical Systems common to Aviation and Medical products. Although this feature may not be applicable to your needs, it does prove that μC/OS-II is a very robust RTOS. μC/OS-II has been used in hundreds of products from companies all around the world. Specifically, μC/OS-II is currently implemented in a wide array of high level of safety-critical devices, including:

Those certified for Avionics DO-178B
Medical FDA pre-market notification (510(k)) and pre-market approval (PMA) devices
SIL3/SIL4 IEC for transportation and nuclear systems, 99% compliant with the Motor Industry Software Reliability Association (MISRA-C:1998) C Coding Standards

Typical Applications:

Avionics - used in the Mars Curiosity Rover!
Medical Equipment/Devices
Data Communications Equipment
White Goods (Appliances)
Mobile Phones, PDAs, MIDs
Industrial Controls
Consumer Electronics
Automotive
A wide range of other safety critical embedded applications

More Development Kits and Tools

	Operating Systems and Stacks		element14 Knode

Key Features

Key Features

Preemptive multitasking real-time kernel with optional round robin scheduling
Unprecedented ease-of-use combined with an extremely short learning curve enables rapid time-to-market advantage
Runs on the largest number of processor architectures with ports easily downloaded
Highly scalable (6K to 24K bytes code space, 1K+ bytes data space) I Max interrupt disable time: 200 clock cycles (typical configuration, ARM9, no wait states)
Sufficiently robust to meet rigorous safety-critical system requirements
Very Low Interrupt Disable Time
Delivered with complete, clean, consistent, 100% ANSI C source code with in-depth documentation.
Up to 254 application tasks (1 task per priority level), and unlimited number of kernel objects
Timeouts on ‘pend’ calls to prevent deadlocks
Mutual exclusion semaphores with built-in priority ceiling protocol to prevent priority inversions
Provides a variety of useful services: event flags; message mailboxes; message queues; fixed-sized memory partitions, task management, time management
Third party certifiable

Technical Specifications

General Specifications:

Maximum ROM Footprint (Unscaled): 24 Kbytes
Minimum ROM Footprint (Scaled): 6 Kbytes
Number of Kernel Services: 10 different using 80 API calls
Multitasking Model: Preemptive
Maximum number of Tasks: 254
Number of Tasks per Priotiy Level: 1
Code Execution Entities: Tasks, ISRs
Dynamic Objects: Static and Dynamic
Data Movement: Message Mailboxes (unlimited)and Message Queues (unlimited)
Semaphores - Full Counting: Yes (unlimited)
Mutexes - With Priority Inheritance: Yes (priority calling)
Event Flags: Yes (unlimited), configurable for 8, 16, or 32 bits
Memory Partitions - RAM Management: Yes
Software Timers: Yes (unlimited)

Detailed Specifications:

Features	Specification
Supported processors	FPU (Floating-Point Unit) Support	Yes
	MPU (Memory Protection Unit) Support	Yes (μC/OS-MPU)
	MMU (Memory Management Unit) Support	Yes (μC/TimeSpaceOS)
Multicore support	AMP (Assymetrical Multi Processing)	Yes
Multitasking model	Maximum number of Tasks	254 application tasks
	Clear stack at task creation	Yes (optional per-task)
	Run-time stack checking	Yes (optional)
	Catch/delete task that return	Yes
	Reentrant libraries	Yes (support of Thread Local Storage for compiler)
	Task registers	Yes (unlimited)
	Tick rate	Configurable (Typ. 1 to 100 ms)
ISR stack	User definable hooks	Yes
	Task switch hook	Yes
	Idle task hook	Yes
	Statistic task hook	Yes
	Create task hook	Yes
	Delete task hook	Yes
	Catch task return hook	Yes
	Initialization hook	Yes
Footprint	ROMable	Yes
	Scalable	Yes (compile and run-time configurable)
	ROM (Min-Max)	6K-20K (bytes)
	RAM	500+ (bytes)
ANSI-C source	Number of source files	Fewer than 25
	Argument checking	Yes (optional)
	ASCII names for kernel objects	Yes
	MISRA-C:2004 rules	Yes (most)
Kernel services	Timeout on calls	Yes (prevents deadlocks)
	Semaphores	Yes (unlimited)
	Event Flags	Yes (unlimited)
	Mutual Exclusion Semaphores	Yes (priority ceiling protocol)
	Message queues	Yes (unlimited)
	Memory partitions	Yes (prevents fragmentation)
	Software timers	Yes (unlimited)
	Task suspend/resume	Yes
	Lock/Unlock scheduler	Yes
	Pend on multiple objects	Yes (optional)
Built-in performance measurements	Maximum interrupt disable time	Yes
	Maximum scheduler lock time	Yes
	Total CPU usage (%)	Yes
	Per-Task stack usage	Yes
	Per-Task run counter	Yes
	Message pool statistics	Yes
	Context switch counter	Yes
	Debugger Kernel Awareness Support	Yes
Third-party certifications	Avionics, DO178B	Yes (Level A)
	Medical, FDA 510(k)	Yes
	Industrial, IEC61508	Yes
Debugger kernel awareness support	IAR	Yes
Debugger kernel awareness support	Atollic	Yes

Supported Devices

Supported CPU

μC/OS-II runs on a large number of processor architectures and ports are available (FREE download) from the knode. The vast number of ports should convince you that μC/OS-II is truly very portable and thus will most likely be ported to new processors as they become available.

Manufacturer	CPU
Altera	Nios II
Analog Devices	Blackfin
ATMEL	AVR, AVR32
Freescale	68HC12, ColdFire, DSP58K, HCS12, HCS12X, M683XX, MC9S08
Fujitsu	FR
Lattice Semiconductor	LatticeMico32
Microchip	PIC24, PIC32
NXP	XA
Renesas	78K0(R), H8-300L, H8S, H8SX, M16C, M32C, R32C, RL78, RX200, RX600, SuperH 2A, V850E/2/S
Texas Instruments	MSP430
Xilinx	MicroBlaze

Video

www.youtube.com/watch

Technical Documents

Learning Center

Type	Description
User Manual	Micrium: μC/OS-II Configuration Manual
Product Brief	Micrium: μC/OS-II Real-Time Operating System Product Brief
Application Note	Micrium: µC/OS-II and Event Flags
Application Note	Micrium: µC/OS-II and Mutual Exclusion Semaphores
Application Note	Micrium: µC/OS-II and the ARM processor
Tutorials	Micrium: Fundamentals of Real-Time Operating Systems

Design Element

Type	Description
Application Library	Micrium: μC/OS-II and the Microchip dsPIC33 (using C30 and the Explorer 16)
Application Library	Micrium: μC/OS-II and the ARM Cortex-M3 Processors
Application Library	Micrium: μC/OS-II and the ColdFire Architecture
Application Library	Micrium: μC/OS-II and the Texas Instrument MSP430F5438 (MSP430x5xx) Processor
Application Library	Micrium: μC/OS-II and the ST STM32 (Cortex-M3) Processorson the IAR STM32F103ZE-SK Kickstart Kit
Application Library	Micrium: μC/OS-II and μC/OS-View for Atmel AVR ATmega2560

Ordering Information

Licensing Options

The user can download and evaluate Micrium μC/OS-II source code for 45 days free of charge. μC/OS-II source code may be used by accredited colleges and universities without a license, as long as the software is used only for educational purposes or peaceful research. Once the code is used to create a commercial project/product for profit, however, it is necessary to purchase a license. Micrium offers the following licensing options.

Single Product License
A Single Product License enables the user to embed a Micriµm software component into one end customer product. This license is perpetual for the life of the customer's product and is without limitation in production quantity. This license is specific to the processor used AND the specific name and model of the customer end product.

Product Line License (Product Family License)
A Product Line License allows the user to embed a Micriµm component into any number of end products within a product family and manufacture an unlimited number of units of each of these products for the life of the end product within the product family.

CPU-Type License (Platform License)
A CPU-Type License allows the user to embed a Micriµm component into any number of end products using a single and specific processor type. The license holder may manufacture an unlimited number of units of each of these products for the life of the end product.

Site License
A Site License allows the user to embed a Micriµm component into any end product that uses any CPU as long as the products are designed from a single site. The user is able to manufacture an unlimited number of units from any location worldwide.

Dedicated Chip

A Dedicated Chip License is exclusive to chip manufacturers. It allows you to embed Micrium software components in one type of chip, and sell that chip to an unlimited number of customers.

It includes an instruction manual that engineers can use to get up and going in hours, with minimal risk.

Common to all Micrium Licenses

All licenses are perpetual for the life of the customer’s product. All Micrium licenses are royalty free – you can build unlimited quantities of your product.

One year maintenance is included with each new software component purchase.

Tags: µc/os-ii, micriµm, µc/os