Introduction to uCOS II v2 6 m1

• Materials in this course is the property of Amr Ali Abdel-Naby.. • Reproduction or transmission of the materials in any manner without the copyright owner permission is a law violation

Introduction to uCOS-II V2.6

About SwiftACT

• A Technology services startup company

o Under establishment

• Areas of specialties:

o Mobile telecommunication services development

o Embedded systems development

About Me

• Graduated 2004

o ECE, ASU: 5 yrs distinction

• 5+ years in embedded systems development

• Materials in this course is the property of Amr Ali Abdel-Naby

• Reproduction or transmission of the materials in any manner without the copyright owner permission is a law violation

Course References

• MicroC/OS-II The Real-Time Kernel, 2nd Edition, by Jean J Labrosse

• Mutual Exclusion Semaphores

• Event Flag Management

• Message Mailbox Management

• Message Queue Management

• Memory Management

• Mutual Exclusion Semaphores

• Event Flag Management

• Message Mailbox Management

• Message Queue Management

• Memory Management

• 1000s applications are using it all over the world.

• A good starting point to experience real-time OS

• Simple but yet very powerful

µC/OS-II in Literature

• Four books were published to explain the internals:

o “μC/OS The Real-Time Kernel”, in 1992

o “μC/OS-II The Real-Time Kernel”, in 1998

o “μC/OS-II The Real-Time Kernel”, Second Edition in 2002

o “μC/OS-III The Real-Time Kernel”, in 2009

µC/OS-II History

µC/OS-II V2.86

µC/OS-II V2.52

µC/OS-II V2.00

µC/OS

µC/OS V1.08

+ Memory Manager

+ Stack Checking

+ CPU Load Checking

µC/OS-II V2.00

+ Safety Critical

+ Mutexes + Semaphores

+ Event Flags

µC/OS-II V2.52

+ Timers +

250 Tasks + MMU & MPU

µC/OS-II V2.86

+

RR Scheduling

+ Infinite # of Tasks

&

Services

• Highly portable ANSI C

• Assembly is kept minimum

• Supports 8-, 16-, 32-, 64- bit processors

• Ported over 100 different processors

• All ports are freely available

• Use the service you only need

o Very few services  Complete services available

o A group of #defines determines scalability.

• Minimum footprint = 2 KB

• Fully preemptive

• Always runs the highest priority task that is ready to run

• Comparable with other preemptive kernels

Task Y ISR

• Manages up to 64 tasks

• 8 tasks are used by µC/OS-II

• 56 tasks are left to applications

• A unique task/priority

• RR and FIFO are not supported

• The only exceptions are OSTimeTick & some event flag services.

Task Stacks

• Each task has its stack

• μC/OS-II allows different stack sizes

• Stack checking utility

• You can determine & decide how much stack is needed for each task

Interrupt Management

• An interrupt can suspend a task execution

• The highest priority ready task runs after serving the interrupt

• Nested interrupts

o Up to 255 level

ISR

Robust & Reliable

• Used by many products

• Support

• Tested & certified in safety critical systems

µC/OS-II Market

• Distributors all over the word

• Huge customer list

o If µC/OS will be distributed with your product as a binary

• Not royalty free