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Chapter 1
1-5 μC/OS, μC/OS-II AND μC/OS-III FEATURES COMPARISON
Table 1-1 shows the evolution of μC/OS over the years, comparing the features available in
each version.
Feature
Year introduced
Book
Source code available
μC/OS
1992
Yes
Yes
μC/OS-II
1998
Yes
Yes
μC/OS-III
2009
Yes
Yes
(Licensees only)
Preemptive Multitasking
Maximum number of tasks
Number of tasks at each priority level
Round Robin Scheduling
Semaphores
Mutual Exclusion Semaphores
Event Flags
Message Mailboxes
Message Queues
Fixed Sized Memory Management
Signal a task without requiring a semaphore
Send messages to a task without requiring a
Yes
64
1
No
Yes
No
No
Yes
Yes
No
No
No
Yes
255
1
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Yes
Unlimited
Unlimited
Yes
Yes
Yes (Nestable)
Yes
No (not needed)
Yes
Yes
Yes
Yes
message queue
Software Timers
Task suspend/resume
Deadlock prevention
Scalable
Code Footprint
Data Footprint
ROMable
No
No
Yes
Yes
3K to 8K
1K+
Yes
Yes
Yes
Yes
Yes
6K to 26K
1K+
Yes
Yes
Yes (Nestable)
Yes
Yes
6K to 20K
1K+
Yes
24
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