Category Archives: C/C++ Programming

Your handy cut-out-and-keep guide to std::forward and std::move

Glennan Carnie

Glennan Carnie

Technical Consultant at Feabhas Ltd
Glennan is an embedded systems and software engineer with over 20 years experience, mostly in high-integrity systems for the defence and aerospace industry.

He specialises in C++, UML, software modelling, Systems Engineering and process development.
Glennan Carnie

I love a good ‘quadrant’ diagram.  It brings me immense joy if I can encapsulate some wisdom, guideline or rule-of-thumb in a simple four-quadrant picture.

This time it’s the when-and-where of std::move and std::forward.  In my experience, when programmers are first introduced to move semantics, their biggest struggle is to know when (or when not) to apply std::move or std::forward.  Usually, it’s a case of “keep apply std::move until it compiles”.  I’ve been there myself.

To that end I’ve put together a […]

Posted in C/C++ Programming | Tagged , , , , , , , | 2 Comments

Setting up Sublime Text to build your project

Glennan Carnie

Glennan Carnie

Technical Consultant at Feabhas Ltd
Glennan is an embedded systems and software engineer with over 20 years experience, mostly in high-integrity systems for the defence and aerospace industry.

He specialises in C++, UML, software modelling, Systems Engineering and process development.
Glennan Carnie

For many years embedded development was dominated by complex integrated development environments (IDEs) that hide away all the nasty, messy details of a typical embedded software project.

Recently, with the rapidly accelerating adoption of agile techniques in embedded systems, there has been a move away from integrated development environments towards smaller, simpler, individual tools.  Tools like CMake, Rake and SCons are used to manage build configurations.  Container facilities like Docker provide lightweight environments for build and test.  And developers are free […]

Posted in Agile, C/C++ Programming, General | Tagged , , , , | 1 Comment

“May Not Meet Developer Expectations” #77

Glennan Carnie

Glennan Carnie

Technical Consultant at Feabhas Ltd
Glennan is an embedded systems and software engineer with over 20 years experience, mostly in high-integrity systems for the defence and aerospace industry.

He specialises in C++, UML, software modelling, Systems Engineering and process development.
Glennan Carnie

Question:  Does the following compile?

int func()
{
  int (func);
  return

Posted in C/C++ Programming | Tagged , , , , , | 3 Comments

Exceptional fun!

Glennan Carnie

Glennan Carnie

Technical Consultant at Feabhas Ltd
Glennan is an embedded systems and software engineer with over 20 years experience, mostly in high-integrity systems for the defence and aerospace industry.

He specialises in C++, UML, software modelling, Systems Engineering and process development.
Glennan Carnie

In this article I want to look at some applications for one of C++’s more obscure mechanisms, the function

Posted in C/C++ Programming | Tagged , , , , , , | 3 Comments

An Introduction to Docker for Embedded Developers – Part 4 Reducing Docker Image Size

Niall Cooling

Director at Feabhas Limited
Co-Founder and Director of Feabhas since 1995.
Niall has been designing and programming embedded systems for over 30 years. He has worked in different sectors, including aerospace, telecomms, government and banking.
His current interest lie in IoT Security and Agile for Embedded Systems.

In Part 3  we managed to build a Docker image containing the tools required to compile and link C/C++ code destined for our embedded Arm target system. However, we’ve paid little attention to the size of the image. Doing a quick Docker image listing we can see its grown to a whopping 2.14GB:

$ docker image ls
REPOSITORY TAG IMAGE ID […]

Posted in Agile, ARM, C/C++ Programming, Cortex, Testing | Tagged , , , | 3 Comments

An Introduction to Docker for Embedded Developers – Part 3 Cross-Compiling for Cortex-M

Niall Cooling

Director at Feabhas Limited
Co-Founder and Director of Feabhas since 1995.
Niall has been designing and programming embedded systems for over 30 years. He has worked in different sectors, including aerospace, telecomms, government and banking.
His current interest lie in IoT Security and Agile for Embedded Systems.

In the previous posting we looked at defining a custom Dockerfile where we can add specific tools (and their dependencies). From that we created a Docker image and this allowed us to build C/C++ code in a Docker container, ensuring a consistent build environment.

So far we have to build all our code using the native GCC toolchain which is part of the base Docker image (gcc:7.2). However, I want to be able to build an image I can download and run […]

Posted in Agile, ARM, C/C++ Programming, Cortex, Testing | Tagged , , | Leave a comment

Making things do stuff – Part 9

Glennan Carnie

Glennan Carnie

Technical Consultant at Feabhas Ltd
Glennan is an embedded systems and software engineer with over 20 years experience, mostly in high-integrity systems for the defence and aerospace industry.

He specialises in C++, UML, software modelling, Systems Engineering and process development.
Glennan Carnie

As a final instalment in this series on hardware manipulation I thought I’d revisit read-only and write-only register types.

Using tag dispatch is not the only way to solve the read- or write-only Register problem.  For completeness let’s explore two other alternatives – SFINAE and constexpr if.

For these examples I’m going to use a simplified version of our Register class.  I’m ignoring the bit proxy class and using a reduced API.  Once understood, the techniques below can be applied to these […]

Posted in C/C++ Programming, Design Issues | Tagged , , , , , , , , , , | 1 Comment

Making things do stuff – Part 7

Glennan Carnie

Glennan Carnie

Technical Consultant at Feabhas Ltd
Glennan is an embedded systems and software engineer with over 20 years experience, mostly in high-integrity systems for the defence and aerospace industry.

He specialises in C++, UML, software modelling, Systems Engineering and process development.
Glennan Carnie

In our previous article we explored using templates to build a generic ‘register’ type to allow programmers to access hardware without all the nasty syntax of integer-to-pointer casting, etc.

At the moment, this class gives us little extra functionality beyond cleaning up the syntax (although, in its favour, it also doesn’t incur any additional run-time cost/performance).

In this article we’re going to extend our design to consider special hardware register types – notably read-only and write-only registers – and see how we can […]

Posted in C/C++ Programming | Tagged , , , , , , | 2 Comments

Making things do stuff – Part 6

Glennan Carnie

Glennan Carnie

Technical Consultant at Feabhas Ltd
Glennan is an embedded systems and software engineer with over 20 years experience, mostly in high-integrity systems for the defence and aerospace industry.

He specialises in C++, UML, software modelling, Systems Engineering and process development.
Glennan Carnie

As code designers we tend to eschew specific ‘stove-pipe’ code in favour of reusable code elements.  Up until now we’ve been coding some very specific examples so it’s probably worth looking at some more generic solutions.

In this article we’ll look at building generic register manipulation classes (or, as one commenter referred to them, ‘register proxy’ classes).  Here, we’re really exploring code design rather than coding ‘mechanics’.  I’m using this to explore some factors like the balance between efficiency, performance and […]

Posted in C/C++ Programming | Tagged , , , , , , , | 3 Comments

Making things do stuff – Part 5

Glennan Carnie

Glennan Carnie

Technical Consultant at Feabhas Ltd
Glennan is an embedded systems and software engineer with over 20 years experience, mostly in high-integrity systems for the defence and aerospace industry.

He specialises in C++, UML, software modelling, Systems Engineering and process development.
Glennan Carnie

We’ve been looking at using C++ to manipulate I/O hardware.   Previously, we’ve looked at the fundamentals of hardware manipulation; and how to encapsulate these mechanisms into classes.  If you’ve not been following along I’d recommend reading the previous articles first before continuing.

This time we’ll explore a lesser-known feature of C++ and its application in hardware manipulation – placement

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