Category Archives: C/C++ Programming

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

Latest posts by Glennan Carnie (see all)

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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Making things do stuff – Part 4

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

Latest posts by Glennan Carnie (see all)

In the last article we explored the design of a class to encapsulate a physical hardware device.  In that article I deliberately ignored how the class would actually interact with the hardware.

In this article we explore the options available to us for accessing hardware and the consequences of those

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Making things do stuff – Part 3

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

Latest posts by Glennan Carnie (see all)

Previously, we’ve looked at the basics of hardware manipulation in C++ and applied that to a simple GPIO implementation.

In this article we’re going to have a look at encapsulating our code in a class and look at some of the design choices we have to make.

If you’re not familiar with hardware manipulation in C++ I’d highly recommend reading the previous articles in this series before continuing.

Even if you’re familiar with the concepts of hardware manipulation, if you haven’t read the […]

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Making things do stuff – Part 2

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

Latest posts by Glennan Carnie (see all)

Last time we looked at the basics of hardware manipulation in C++.   This time we’ll apply this to some real hardware and have a look at the code

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Making things do stuff – Part 1

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

Latest posts by Glennan Carnie (see all)

C has long been the language of choice for smaller, microcontroller-based embedded systems; particularly for close-to-the-metal hardware manipulation.

C++ was originally conceived with a bias towards systems programming; performance and efficiency being key design highlights.  Traditionally, many of the advancements in compiler technology, optimisation, etc., had centred around generating code for PC-like platforms (Linux, Windows, etc).  In the last few years C++ compiler support for microcontroller targets has advanced dramatically, to the point where Modern C++ is a increasingly attractive language […]

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‘Abusing’ the C switch statement – beauty is in the eye of the beholder

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.

The C Language

Before we start, let’s get something straight; for over 30 years now I have had a love-hate relationship with the C programming language. The ‘engineer’ in me[1] sometimes just cannot believe we are still using C as the dominant embedded programming languages after all these years, and yet, I also see the simplicity and elegance the C code can bring. After all it’s just a tool, and even a good tool in the wrong hands; well we have plenty […]

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A convenient untruth

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

Latest posts by Glennan Carnie (see all)

Array notation in C is a lie!

Sorry, dear reader*, but I cannot participate in this conspiracy any longer.  You have been lied to, manipulated and coerced into thinking arrays are a construct of the C language.  I feel it is my solemn duty to blow the whistle on this charade and expose the dirty secrets of C’s so-called arrays.

(* It is statistically possible that more than one person might read this, of

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Death and (virtual) destruction*

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

Latest posts by Glennan Carnie (see all)

This time, we’ll have a more detailed look at one of those everybody-knows-that elements of C++ – virtual destructors.

More specifically, I want to reinforce under what circumstances you should make your destructor virtual; and when you don’t need to (despite what your compiler might say)

(*there’s no

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Getting your head around auto’s type-deduction rules

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

Latest posts by Glennan Carnie (see all)

Automatic type-deduction is perhaps one of the more divisive features of Modern C++.  At its core it’s a straightforward concept:  let the compiler deduce the type of an object from its initialiser.   Used in the right way this can improve the readability and maintainability of your code.

However, because auto is based on template type-deduction rules there are some subtleties that can catch the unwary programmer.

In this article we’ll have a look at auto in the context of the template type-deduction […]

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Great Expectations

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

Latest posts by Glennan Carnie (see all)

Previously, we’ve looked at the basic concepts of function parameter passing, and we’ve looked at the mechanics of how parameters are passed at the Application Binary Interface (ABI) level.

Far too often we focus on the mechanisms and efficiency of parameter passing, with the goal: if it’s efficient then it’s good; that’s all there is to it.  In this article I want to move past simple mechanics and start to explore function parameter design intent – that is, what can I […]

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