What's New in the Microcontroller Development Kit version 5.40

[MDK-ARM Core Installer]
- The MDK default installation folder has changed from 'C:\Keil_v5\' to '%LOCALAPPDATA%\Keil_v5\' in MDK 5.40. This destination typically provides sufficiently restrictive file permissions that protect against the security vulnerability CVE-2022-43701. It is the user's responsibility to ensure the correct access rights of the installation folder.
[µVision updated to V5.40.0.0]
- Updated menu item "Save.uvprojx|uvmpw to csolution format" to Export Menu and adding support for converting multi-project workspaces.
- Open Project... of a CMSIS Solution project invokes the cbuild setup command using the CMSIS-Toolbox shipped as part of MDK. The results of the command are redirected to the output window. If the command fails, the loading of the project is aborted. Reopen the solution once the reported errors are fixed.
. It is required that the tools cmake version 3.25.2 or higher and ninja 1.10.2 or higher are installed and in the %PATH% before launching µVision.
. The µVision build buttons are now enabled and use the CMSIS-Toolbox to build the contexts specified in the *.cbuild-set.yml.
. All registered Arm Compiler 6 versions are automatically registered when a build is invoked from µVision
- Added support for using STMicroelectronics STM32CubeMX as a Global Generator.
- Updated MDK PackInstaller:
. fixing problems configuring a proxy server.
. added check-box at the top of the tab named "Packs" enabling the display of deprecated packs. By default pack descriptions of deprecated public packs are not read.
[Arm Compiler included]
- Arm Compiler 6 version 6.22 - see Release Notes for further details.
[Software Packs included]
Keil::[email protected]
- All components require the Event Recorder component from ARM::CMSIS-View pack (instead of deprecated ARM_Compiler pack).
- All component configuration files got updated.
- For details see the "Revision History" of the component documentation.
. Network Component Version 7.19.0
. Network Component Version 6.7.7 was deprecated and got removed.
. FileSystem Component Version 6.16.6
. USB Component Version 6.17.0
ARM::[email protected]
- Added support for Arm Cortex-M52.
- Added CoreDebug symbols back for compatibility with CMSIS_5. Use define "CMSIS_DISABLE_DEPRECATED" to hide symbols.
ARM::[email protected]
- Enabled use with Arm Cortex-M52 based devices. For bug fixes refer to the Revision History.
ARM::[email protected]
- Aligned with CMSIS v6.
ARM::[email protected] (unchanged)
ARM::[email protected]
- This is non backward compatible API change, for improved read efficiency in FC for MVE extension. The new api changes are arm_vector_sum_s8, arm_svdf_s8 and arm_svdf_s8_get_buffer_size_mve. Please refer to arm_nnfunctions.h for details.
ARM::[email protected]
- Enabled use with Arm Cortex-M52 based devices.
- Removed the dependency on "Device:Startup" component.
ARM::[email protected]
- Enabled use with Arm Cortex-M52 based devices.
ARM::[email protected]
- Added Arm Cortex-M52 based device "ARMCM52"
[CMSIS-Toolbox]
- Updated the CMSIS-Toolbox to version 2.4.0. See Release Notes for details.
[Cortex-M and Corstone models]
-AVH FVP Modelswere updated to version 11.24.24.
. Added the Corstone SSE-315 (Cortex-M85) model with the Mali-C55 Image Signal Processor (ISP) and the Ethos-U65 machine learning processor (NPU).
. Added the model for Cortex-M52 core (MPS2).
. AVH FVP models can now be run only if MDK is activated with a User-based License (UBL), and do not work with node-lock/flex licenses. If you want to run models under legacy licensing technology, you need to copy the VHT/FVP models from older MDK installations.
- The AVH models were previously located in 'nstall_dir\ARM\VHT' have been now moved to 'nstall_dir\ARM\avh-fvp' and renamed (starting with "FVP_" prefix instead of "VHT_"). This fully aligns the AVH FVP deliverables in MDK installer with other delivery channels (such as Arm tools artifactory).
[Target debugging]
Segger J-Link
- Updated debug driver to version 7.96h.
STMicroelectronics ST-LINK
- Updated ST-LINK driver to version 3.3.0 and ST-Link Upgrade Utility to version 3.15.6.
Nuvoton NU-Link
- Updated NuLink driver to version 3.15.7623r

TheKeil products from ARMinclude C/C++ compilers, debuggers, integrated development and simulation environments, RTOS and middleware libraries, and evaluation boards for ARM, Cortex-M, Cortex-R4, 8051, C166, and 251 processor families. Since the acquisition, ARM has continued the development and support of Keil products for existing 8051, 251, and C166 markets.
Keil MDK - Getting started. Tutorial
You will learn how easy it is to get started with MDK Version 5 to efficiently develop embedded applications for microcontrollers based on ARM Cortex-M processors series.
Keilwas founded in 1985 to market add-on products for the development tools provided by many of the silicon vendors. It soon became evident that there was a void in the marketplace that must be filled by quality software development tools. It was then that Keil implemented the first C compiler designed from the ground-up specifically for the 8051 microcontroller.In October 2005, Keil (Keil Elektronik GmbH in Munich, Germany, and Keil Software, Inc. in Richardson, Texas) was acquired by ARM.