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(February 2016) () MicroC/OS Micrium, Inc., Silicon Labs OS family Working state Current Source model, source available Initial release 1991; 27 years ago ( 1991) OS-III / 2016; 2 years ago ( 2016) Marketing target English Platforms,,; type Default μC/, education use Official website Micro-Controller Operating Systems ( MicroC/OS, stylized as µC/OS) is a (RTOS) designed by embedded software developer, Jean J. Labrosse in 1991.
It is a priority-based kernel for, written mostly in the programming language. It is intended for use in. MicroC/OS allows defining several functions in C, each of which can execute as an independent thread or task. Each task runs at a different priority, and runs as if it owns the (CPU). Lower priority tasks can be preempted by higher priority tasks at any time. Higher priority tasks use operating system (OS) services (such as a delay or event) to allow lower priority tasks to execute.
OS services are provided for managing tasks and memory, communicating between tasks, and timing. Contents • • • • • • • • • • • • • • • • • • • • • • • • History [ ] The MicroC/OS kernel was published originally in a three-part article in Embedded Systems Programming magazine and the book µC/OS The Real-Time Kernel by Jean J. Labrosse ( ). The author intended at first to simply describe the internals of a operating system he had developed for his own use, but later developed the OS as a commercial product in versions II and III.
Writing applications for it [ ] Tasks running on a multitasking kernel should be written in one of two ways: • A non-returning • A task that deletes itself after running µC/OS-II [ ] Based on the source code written for µC/OS, and introduced as a commercial product in 1998, µC/OS-II is a, ROM-able,, preemptive, real-time, deterministic, multitasking for, and (DSPs). It manages up to 255 application tasks. Its size can be scaled (between 5 to 24 Kbytes) to only contain the features needed for a given use.
Most of µC/OS-II is written in highly portable, with target microprocessor-specific code written in. Use of the latter is minimized to ease to other processors.
Uses in embedded systems [ ] µC/OS-II was designed for embedded uses. If the producer has the proper tool chain (i.e., C compiler, assembler, and linker-locator), µC/OS-II can be embedded as part of a product. ΜC/OS-II is used in many embedded systems, including: • • and devices • • White goods () •, (PDAs), MIDs • Industrial controls • • Task states [ ] µC/OS-II is a operating system. Each task is an infinite loop and can be in any one of the following five states (see figure below additionally) • Dormant • Ready • Running • Waiting (for an event) • Interrupted ( (ISR)) Further, it can manage up to 255 tasks. However, it is recommended that eight of these tasks be reserved for µC/OS-II, leaving an application up to 247 tasks. Kernels [ ] The is the name given to the program that does most of the housekeeping tasks for the operating system.