Breathing with Oxygen: DIY ARM Cortex-M C/C++ IDE and Toolchain with Eclipse Oxygen

Last month (June 2017), the latest version of Eclipse “Oxygen” has been released, and I have successfully used it in several embedded projects. Time to write a tutorial how to use it to build a custom Do-It-Yourself IDE for ARM Cortex-M development: simple, easy, unlimited and free of charge. While the DIY approach takes a few minutes more to install, it has the advantage that I have full control and I actually know what I have.

Eclipse Oxygen

Eclipse Oxygen


Eclipse Oxygen (4.7) is the latest and most advanced version of Eclipse as of today. It comes with many new and useful features, see This article describes how to build a custom DIY (Do-It-Yourself) IDE for development for any ARM Cortex-M based device.

Vendor provided Eclipse IDEs are maybe easier to install for a Newby and can have great extension features. But on the other end the licensing terms put some usage limites (e.g. I can use the IDE only for devices from that vendor, or other kind of limitations). As at the university we building up a new curriculum with a course which uses microcontroller from multiple vendors, we are going to use a custom DIY Eclipse version we can have installed on every students machine without any strings attached.

To install a custom DIY Eclipse based IDE for C/C++ development for any ARM Cortex-M devices is pretty simple and requires about 20-30 minutes including download time. I need

  • Eclipse Oxygen for C/C++
  • GNU ARM MCU plugins
  • ARM Cortex Build tools
  • Debug probe interface (P&E and Segger), depending on the debug interface used

My screenshots show things for a Windows 10 64-bit machine, but everything applies to Linux or Mac machines as well.

In the installation instructions below I prefer to download the zip/archive packages: that way I can build up an Eclipse installation with no need for an installer: everything is included in a directory tree I easily can zip for a backup or pass to someone else. The only exception are the debug probe support files as they run an installer to install the necessary USB device drivers.

Eclipse Oxygen Installation

This step includes the core of everything: the Eclipse IDE and framework.

Go to and choose your package to download and install. The default is to download a small installer which then downloads the other files while installing. I prefer the ‘Download Packages’ method as with this I get everything on my disk as a zip file which then I can pass to students or install on multiple machines without downloading things multiple times.

Eclipse Doxygen download

Eclipse OXYGEN download

So I select the ‘Download Packages‘ link and use the “Eclipse IDE for C/C++ Developers” (around 200 MByte):

Eclipse for C and C++ Developers

Eclipse for C and C++ Developers

The package is an archive/zip file. Extract the files to a folder, e.g. C:\Eclipse\Oxygen:

Eclipse package extracted

Eclipse package extracted

GNU MCU Eclipse

Here again I prefer the local archive way. Download the latest version from

GNU MCU Eclipse Installation package

GNU MCU Eclipse Installation package

To install the plugins in Eclipse, use the menu Help > Install New Software and use the archive file from the previous step:

Installing GNU MCU Eclipse Plugins

Installing GNU MCU Eclipse Plugins

A restart of Eclipse is asked at the end of the installation process.

ARM Toolchain

This step installs the needed compiler and build tools to develop for ARM Cortex.

Go to and go to the downloads ( I prefer the zip file (not the installer) as I don’t want the installer to make any environment or path changes.

GNU ARM Embedded Toolchain

GNU ARM Embedded Toolchain

Then I have unpacked the toolchain files into my Eclipse directory (c:\eclipse\oxygen\toolchain):

GNU ARM Embedded Toolchain

GNU ARM Embedded Toolchain

💡 We need that path later to tell Eclipse where to find the compiler/linker/etc.

GNU MCU Eclipse Build Tools

To run the build tools (echo, make, mkdir, rm), I need extra utilities on Windows.

Go to and download the latest build tools zip file:

GNU MCU Eclipse Windows Build Tools

GNU MCU Eclipse Windows Build Tools

Place the folder inside the Eclipse Oxygen folder:

GNU Eclipse Build tools

GNU Eclipse Build tools

Eclipse Paths: Global Build Tools and ARM Toolchain

We need to tell Eclipse where to find the tools. I do not prefer using environment variables (see for a detailed discussion), instead I like to point to the tools bundled with the IDE (that’s why I have installed it inside the IDE folder). The setting for the Global Build Tools Path is in Eclipse (menu Window > Preferences):

Global Build Tools Path

Global Build Tools Path

I’m using the ${eclipse_home} variable to keep things relative to my Eclipse IDE:

${eclipse_home}\GNU MCU Eclipse\Build Tools\2.9-20170629-1013\bin

💡 if using a different version of the GNU MCU Eclipse plugins, you have to update the above path. Another solution is to have a ${eclipse_home}\GNU MCU Eclipse\bin folder for all the binary tools.

Same for the setting pointing to the ARM toolchain:

${eclipse_home}\GNU Tools ARM Embedded\6 2017-q2-update\bin
Global ARM Toolchains Paths

Global ARM Toolchains Paths


This step is only needed if you plan to use the SEGGER J-Link debug probe. The Segger probes are of course not free of charge, but many vendor boards (NXP Freedom/Tower boards, STM Nucleo boards, …) can be loaded with a Segger firmware.


J-Link EDU with a NXP/Freescale Tower Board

The J-Link software is available for download from Because it installs USB drivers, it is a setup executable which installs the drivers.

💡 To have a ‘self-containing’ IDE, I can install the J-Link inside my Eclipse IDE folder (e.g. c:\Eclipse\Oxygen\Segger) and run the <install>USBDriver\InstDrivers.exe re-install the USB drivers if needed.

In the settings (Window > Preferences > MCU > Workspace) specify the file and path to the Segger GDB Executable:

Global Segger J-Link Path

Global Segger J-Link Path

With this I can use the Segger J-Link debug connection.

If you have a STM board with the ST-Link on it, you can convert it into a Segger J-Link probe, see

If you have the popular NXP LPC-Link2 debug probe, the same is described here:

P&E Multilink

This step is only needed if working with the P&E debug probes. Similar to the one from Segger, many boards can be loaded with a P&E debug firmware to debug it.

Debugging FreeRTOS on NXP FRDM-K64F with P&E Multilink Universal

Debugging FreeRTOS on NXP FRDM-K64F with P&E Multilink Universal

The P&E drivers can be downloaded from (user account/login required):



Download and run the setup to have the USB drivers installed. The Eclipse plugins are available from the following Eclipse update site:
PEMicro Eclipse Update

PEMicro Eclipse Update

💡 If you need to have that update site available for offline installation, it is possible to download the update site, see

With this I can use the P&E Multilink debug connection.


To use ST-Link2 debug probes, download and install the drivers from

STM32F303 Nucleo-32

STM32F303 Nucleo-32

The easiest way for me to use any ST-Link2 is to convert it into a Segger J-Link (see

The other option is to use OpenOCD (if you insist), but OpenOCD always has been problematic for me and not very stable. The best option is to use the hassle free distribution of OpenOCD by GNU MCU Eclipse: Download the latest version from (I prefer again the .zip file which I can extract into the Eclipse IDE folder).

There is more…

The cool thing with Eclipse is that there are thousands of plugins. Here are a few pointers what to add:

There are many more plugins you can use.


It does not take much to  have a custom DIY IDE and toolchain around Eclipse Oxygen. Of course it requires me to download and install several packages, but at the end I have a fully featured IDE: simple to use, unlimited and free of charge.

Happy Oxygening 🙂


9 thoughts on “Breathing with Oxygen: DIY ARM Cortex-M C/C++ IDE and Toolchain with Eclipse Oxygen

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