uC-OS2 (a.k.a. uC/OS-II or MicroC/OS-II) is a portable, ROMable, scalable, preemptive, real-time deterministic multitasking kernel for microprocessors, microcontrollers and DSPs. Offering unprecedented ease-of-use, uC-OS2 is delivered with complete 100% ANSI C source code and in-depth documentation. uC-OS2 runs on the largest number of processor architectures, with ports available for download from the Micrium Web site.

For the complete documentation, visit https://doc.micrium.com/display/ucos/

uC-OS2 Source Code

The uC-OS2 code ( V2.93.00) has been taken from the following GitHub repository:

https://github.com/SiliconLabs/uC-OS2

NOTE: The uC-OS2 from GitHub has been altered by Quantum Leaps to reduce its size. Specifically, the Ports sub-directory has been cleaned up and only the uC-OS2 ports relevant to the provided examples have been retained.

uC-OS2 Ports

The folder "Ports" contains the generic uC-OS2 Ports to ARM-Cortex-M3 and ARM-Cortex-M4.

NOTE: The ports have been modified by Quantum Leaps to remove the dependencies on the Micrium's uC-CPU and uC-LIB components, and instead to inter-operate with the Cortex Microcontroller Software Interface Standard (CMSIS).

Modifications for CMSIS

Specifically, the names of the standard exception handlers PendSV and SysTick used by the uC/OS-II ports have been renamed to be compliant with the CMSIS naming convention.

Additionally, the Cortex-M4F ports have been modified to include the FPU configuration that is expected by the uC/OS-II port to Cortex-M4F, which was different from the FPU configuration performed by the CMSIS-compliant startup code. Specifically, the explicit FPU configuration has been OSInitHookEnd() function in the file os_cpu_c.c.

Licensing Information

uC-OS2 is provided by Silicon Labs under the Apache License, Version 2.0. Please refer to the file license.txt in the same folder as this README.md file.