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CMSIS++ is a portable, vendor-independent hardware abstraction layer intended for embedded applications, but designed with special consideration for the industry standard ARM Cortex-M processor series.
The original ARM Keil name stands for Cortex Microcontroller Software Interface Standard, and the CMSIS++ design inherits the good things from ARM CMSIS but goes one step further into the world of C++; it is not a C++ wrapper on top of ARM CMSIS, but a completely new design in C++, with several C APIs as wrappers on top of the native C++ APIs.
The CMSIS++ components are:
Although designed with both the 32-bits Cortex-M architectures and the
arm-none-eabi-gcc compiler in mind, most CMSIS++ components are highly portable and can be compiled with any ISO C++ 11 compiler for other platforms too, for example the CMSIS++ RTOS can run on 64-bits Intel based POSIX desktops, greatly improving components testability.
CMSIS++ was created both as a proposal for a future CMSIS, and to overcome the limitations/problems of the current CMSIS design, among them the lack of proper C++ support.
CMSIS++ is provided free of charge under the terms of the MIT License.
This means you can use CMSIS++ in any commercial or open source projects without any limitations except preserving the included copyright notice.