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

Yiying — Tue, 24 Jun 2014 22:56:05 GMT

Current Revision posted to Documents by Yiying on 6/24/2014 10:56:05 PM

Ordering Information

Key Features

Technical Specifications

Supported Devices

Video

Technical Documents

Overview

µC/OS-III is a highly portable, ROMable, scalable, preemptive, real-time, deterministic, multitasking kernel for microprocessors, microcontrollers and DSPs. μC/OS-III is Micrium’s newest RTOS, designed for developers who need to save time on their current and next embedded sytem projects. Using a commercial real-time kernel such as μC/OS-III provides a solid foundation and framework to the design engineer dealing with the growing complexity of embedded designs. μC/OS-III is a complete new real-time kernel with roots in μC/OS-II.

In addition to the features inherent in μC/OS-II, μC/OS-III also manages an unlimited number of application tasks, and features an interrupt disable time of near zero. μC/OS-III manages unlimited application tasks, constrained only by a processor’s access to memory. μC/OS-III supports an unlimited number of priority levels. Typically, configuring μC/OS-III for between 8 and 256 different priority levels is adequate for most embedded applications. µC/OS-III allows multiple tasks to run at the same priority level. When equal priority tasks are ready-to-run, µC/OS-III runs each for a user-specified amount of time. Each task can define its own time quanta and give up its time slice if it does not require the full time quanta.

Besides unlimited taks management, other services μC/OS-III provides include unlimited tasks, semaphores, mutexes, event flags, message queues, timers, memory partitions, and more. The user allocates all kernel objects at run time. μC/OS-III provides features to allow stack growth of tasks to be monitored. While task size is not limited, they need to have a minimum size based on the CPU used.

μC/OS-III has a number of internal data structures and variables that it needs to access atomically. It protects these critical regions by disabling interrupts for almost zero clock cycles, ensuring that it is able to respond to some of the fastest interrupt sources. Interrupt response with μC/OS-III is deterministic.

µC/OS-III provides extensive range checking which can be disabled at compile time. µC/OS-III thus checks for NULL pointers passed in API calls, task level services from ISRs aren’t called, arguments are within allowable range, and specified options are valid. Each API function provides an error code regarding the outcome of the function call.

μC/OS-III’s footprint can be scaled to only contain the features required for a specific application. The execution time for most services provided by μC/OS-III is both constant and deterministic; execution times do not depend on the number of tasks running in the application

Typical Applications:

Data Communications Equipment
White Goods (Appliances)
Mobile Phones, PDAs, MIDs
Industrial Controls
Consumer Electronics
Automotive
A wide range of 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
Delivered with complete, clean, consistent, 100% ANSI C source code with in-depth documentation.
Highly configurable
Intuitive Application Programming Interface (API)
Preemptive Multitasking: Runs the most important task that is ready
Nested task suspension
Very Low Interrupt Disable Time
Scalable to contain only required features
Highly scalable (6K to 24K bytes code space, 1K+ bytes data space)
Mutual exclusion semaphores with built-in priority inheritance protocol to prevent priority inversions( Mutexes)
Built-in performance measurements for execution time of each task, stack usage of each task, number of times a task executes, CPU usage, ISR-to-task and task-to-task response time, interrupt disable time, and more
Timeouts on ‘pend’ calls to prevent deadlocks
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: Unlimited
Number of Tasks per Priotiy Level: 1
Code Execution Entities: Tasks, ISRs
Dynamic Objects: Static and Dynamic
Data Movement: 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
Multicore support	AMP (Assymetrical Multi Processing)	Yes
Multitasking model	Maximum number of Tasks	Unlimited
	Round-Robin Scheduling	Yes (optional) Unlimited number of tasks at each priority
	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-24K (bytes)
	RAM	1K+ (bytes)
ANSC-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)
	Task semaphore	Yes
	Event Flags	Yes (unlimited)
	Mutual Exclusion Semaphores	Yes (full priority inheritance and nestable)
	Message queues	Yes (unlimited)
	Task message queue	Yes (optional)
	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
	Per-Task maximum interrupt disable time	Yes
	Per-Task maximum scheduler lock time	Yes
	Per-Task CPU usage (%)	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	In progress
	Medical, FDA 510(k)	In progress
	Industrial, IEC61508
Debugger kernel awareness support	µC/Probe	Yes (Graphical Live Watch™)
	IAR	Yes
	Atollic	Yes

Supported Devices

Supported CPU

μC/OS-III 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-III 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	ColdFire, HCS12
Microchip	PIC24, PIC32
Renesas	78K0R, RL78, RX200, RX600, SuperH 2A, V850E/2/S
Texas Instruments	MSP430
Xilinx	MicroBlaze

Video

Video1	Video2	Video3
www.youtube.com/watch	www.youtube.com/watch	www.youtube.com/watch

Video1

Video2

Video3

www.youtube.com/watch

Technical Documents

Learning Center

Type	Description
Product Brief	Micrium: μC/OS-III Real-Time Operating System Product Brief
White Paper	Micrium: μC/OS-III Features
Training Video	Micrium: Multitasking with Only Five API Calls with μC/OS-III (Part 1/3)
Training Video	Micrium: Multitasking with Only Five API Calls with μC/OS-III (Part 2/3)
Training Video	Micrium: Multitasking with Only Five API Calls with μC/OS-III (Part 3/3)
Training Video	Micrium: TI Stellaris Robotic Evaluation Board With Micrium's μC/OS-III

Design Element

Type	Description
Application Library	Micrium: μC/OS-III Kernel Source Code
Application Library	Micrium: μC/OS-III Project for NXP Cortex-M3 LPC1768
Application Library	Micrium: μC/OS-III Project for STMicro Cortex-M3 STM32F107
Application Library	Micrium: μC/OS-III Project for Freescale Kinetis TWR-K53N512
Application Library	Micrium: μC/OS-III Project for Luminary Micro LM3S9B92
Application Library	Micrium: μC/OS-III project for the Atmel AVR32UC3A on the EVK1100

Ordering Information

The user can download and evaluate Micrium μC/OS-III source code for 45 days free of charge. μC/OS-III 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.