Build and Clean Selected Files in Eclipse CDT

Sometimes it is very useful to clean or build a selected set of files. For this I select the file(s) in the Eclipse Project Explorer and use the context menu:

Build Selected Files

Build Selected Files

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Tutorial: Blinky with NXP Kinetis SDK V2.0 and Processor Expert

In “Mother of Components: Processor Expert with NXP Kinetis SDK V2.0 Projects” I presented an approach how to use Processor Expert components with the NXP Kinetis SDK. This article is a tutorial how to create a blinking LED project with that approach, using McuOnEclipse Processor Expert components and the Kinetis SDK V2.0. As board the FRDM-K22F is used:

Blinky on a FRDM-K22F with SDK V2.0 and Processor Expert

Blinky on a FRDM-K22F with SDK V2.0 and Processor Expert

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Build Configurations in Eclipse

Eclipse based IDE’s have a powerful feature to make ‘variants’ of the same projects: Build Configurations. Build configurations are a powerful thing in Eclipse: they allow me to make ‘variants’ of a project. The project will share the common things, and I can simply tweak things one way or the other for example to produce a ‘release’ or a ‘debug’ binary of my application without duplicate the project.

Build configurations are manged through either the context menu on the project or with the top menu:

Eclipse Project Build Configuration

Eclipse Project Build Configuration

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Mother of Components: Processor Expert with NXP Kinetis SDK V2.0 Projects

Unfortunately, now the NXP Kinetis SDK V2.0 does not include Processor Expert support (see “First NXP Kinetis SDK Release: SDK V2.0 with Online On-Demand Package Builder“). But at the Lucerne University we are using more than 150 different custom Processor Expert components we would like to use with that new SDK. So how to make them working with the Kinetis SDK V2.0? Using a Processor Expert as “the mother of all components”:

NXP Kinetis SDK V2.0 and Processor Expert Side-by-Side under Eclipse

NXP Kinetis SDK V2.0 and Processor Expert Side-by-Side under Eclipse

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Assembly Files in Eclipse CDT Projects

My embedded applications are implemented mostly in C, a few in C/C++. But all of them have one or few assembly files included too: Assembly programming is the needed to do low-level things so it is a natural part of a true embedded application. For example I use often an assembly file for the application startup code.

I have run into a nasty Eclipse CDT issue which deals with assembly files projects. Here is a quizz for you: can you spot the problem in my project below?

Startup Assembly Code

Startup Assembly Code

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Changing Heap and Stack Size for NXP Kinetis SDK V2.0 gcc Projects

With Processor Expert projects it is very easy to change the heap and stack size: There is a setting for this in the Cpu component settings, under the ‘Build options’ tab:

Heap and Stack Size with Processor Expert

Heap and Stack Size with Processor Expert

As there is no Processor Expert in the NXP Kinetis SDK V2.0 (see “First NXP Kinetis SDK Release: SDK V2.0 with Online On-Demand Package Builder“), how to do the same in a SDK V2.0 project?

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Semihosting with Eclipse and the NXP Kinetis SDK V2.0

The world is changing, and the say is “change is good” :-). In the software and API world, change very often means that a change results into something broken. So I had battled with semihosting working on the NXP Kinetis parts, only to find out that it does not work any more with using the latest version 2.0. The semihosting output e.g. with P&E debug connection remains empty:

No Semihosting output

No Semihosting output

So how to fix this?

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Tutorial: Blinky with the FRDM-KL27Z and Kinetis SDK v2

I’m using the FRDM-KL25Z in my classes, and that board is very popular: low price (<$15), reasonable features (48 MHz ARM Cortex M0+, 128 KByte of FLASH, 16 KByte of RAM), and many tutorials elsewhere and on McuOnEclipse :-).

For the next (Fall) semester I’m looking for alternative boards, and one is the Freescale (now NXP) FRDM-KL27Z:

FRDM-KL27Z with Box

FRDM-KL27Z with Box

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Merging S19 Files

If using a bootloader with an application, one thing is to to merge the bootloader with the application into a single file. I do this with the ‘SRecord’ tool like this:

srec_cat bootloader.s19 application.s19 -o merged.s19
Combining S19 Files

Combining S19 Files

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Are ARM CMSIS-Pack the Future of Software Components?

I’m using Processor Expert components for nearly every Freescale (now NXP) projects: for S08, S12, ColdFire, DSC and especially all the different NXP Kinetis devices. Not only because it makes software development fast and easy and allows re-use of software, but as well because Processor Expert has a good way to pack and distribute software components. Unfortunately Processor Expert is not any more included for the new Kinetis devices (see “First NXP Kinetis SDK Release: SDK V2.0 with Online On-Demand Package Builder“). So I have looked into an alternative and hopefully vendor neutral way to build and distribute software packages using CMSIS-Pack.

CMSIS-PACK in Eclipse

CMSIS-Pack in Eclipse

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Renaming Eclipse CDT Projects

When I create a project in Eclipse (e.g. in Kinetis Design Studio with the GNU ARM Eclipse plugins), I have to specify the name of the project during creation time:

Project Name in Eclipse

Project Name in Eclipse

But what if I change my mind later on and want to use a different name? How to rename the project?

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Preprocessor Listing for GNU gcc with GNU ARM Eclipse Plugins

In case there are problems with the C/C++ preprocessor, it is useful to generate the compiler preprocessor listing. Here is how to create a preprocessor listing with GNU gcc compiler and the GNU ARM Eclipse plugins in Eclipse:

Preprocessor Listing in Eclipse

Preprocessor Listing in Eclipse

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GNU gcc printf() and BuiltIn Optimizations

Readers of my blog know: I’m not a fan of printf(), and I think for many good reasons. Still printf() is widely used, and the GNU gcc tries to optimize things. This is observed with a simple example: If I’m writing

printf("a");

Then the code produced (ARM Cortex-M0+ with GNU ARM Embedded 4.9 2015q2 gives:

movs r0, #97    ; 0x61
bl 0xa98

Instead of calling printf(), it is calling putchar()! Why is that?

PutChar instead of Printf

PutChar instead of Printf

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Segger SystemView: Realtime Analysis and Visualization for FreeRTOS

One of the most important aspects for developing complex realtime applications is get insights into what is going on the target. Segger just has released a free tool which gives an incredible useful insight view and visualization:

Segger System View for FreeRTOS

Segger System View for FreeRTOS

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An Introduction to Kinetis Design Studio for Mac OS X

I don’t own a Mac computer, and I try to keep my tutorials as multi-host-platform as possible. So it is always cool to see if someone else posts a nice tutorial on a different host machine: For all Mac (and as well non Mac) users, have a look at this tutorial Nash Reilly has posted: “An Introduction to Freescale’s Kinetis Design Studio.”

added_C_cross_compile_includes

It nicely explains downloading and installing KDS with the Kinetis SDK and then run a ‘hello world’ program on the hardware.

And very worthwhile to check out Nash’s other articles here too: http://www.allaboutcircuits.com/author/nash-reilly

Happy Nashing 🙂

Linking additional Object Files with GNU Linker

Sometimes I need to link an object file (e.g. bootloader.o) to my application, and I do not want to build it, or I do not have the sources to build it. There is a simple way with the GNU ARM Eclipse plugins to link extra object files:

Other Objects for GNU Linker

Other Objects for GNU Linker

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Aligning S19 Records to 64-bit Boundaries

Many tool chains and linker are able to produce S19 files, such as with the GNU tools it is the ‘objcopy‘ which does this job (see “Binary (and S19) Files for the mbed Bootloader with Eclipse and GNU ARM Eclipse Plugins“). But these tools usually cannot handle the special cases. For example on the Freescale Kinetis K64F my serial bootloader (see “Serial Bootloader for the Freedom Board with Processor Expert“) had a problem with these lines in the S19 file:

Not aligned S19 file entries

Not aligned S19 file entries

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Using Precompiled Headers with GNU gcc in Eclipse

Some of my robotics projects take a rather long time do a full build. When I developed applications with Visual C++ on the host, using precompiled headers gave me a big boost in compilation speed. I was looking for the same in similar with GNU and gcc, and as expected: gcc does support precompiled headers too. And indeed, I was able to cut down compilation time by 30% :-). So this post is about how to use gcc with precompiled headers in Eclipse/CDT to give my builds a boost.

using precompiled header

using precompiled header

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