# CMSIS Version 4 (legacy repository)

**IMPORTANT:**
## CMSIS Version 5 is available via https://github.com/ARM-software/CMSIS_5

Cortex Microcontroller Software Interface Standard. Refer to www.arm.com/cmsis for more information.

This GIT repository contains the CMSIS Version 4 release images starting from V4.3.0.
Note that CMSIS Version 5 is available via https://github.com/ARM-software/CMSIS_5.

**Issues** is the location to provide feedback and report problems for the older CMSIS Version 4.  CMSIS Version 5 is developed on https://github.com/ARM-software/CMSIS_5 and suggestions for future revisions or feedback specific to that version should be provided there.

**Releases** provides access to the generated software packs.  These packs are also available via _Download Specifications_ on www.arm.com/cmsis

**License** the CMSIS components (CORE, RTOS, DSP, Driver) that are intended to run on the Cortex-M device are today licensed under BSD or zlib license. The detailed license agreement for CMSIS can be found here: 
https://github.com/ARM-software/CMSIS/blob/master/CMSIS/CMSIS_END_USER_LICENCE_AGREEMENT.pdf (refer to Separate Files)

## Access to CMSIS Development
We are pleased to see so much valueable feedback about the various CMSIS components.  For the upcoming CMSIS version 5 we have changed our approach and make also the development available under https://github.com/ARM-software/CMSIS_5. To accept contributions to the source we did also change the license to Apache 2.0.









