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Tag Archives: design
Introduction to the ARM® Cortex®-M7 Cache – Part 2 Cache Replacement Policy
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.
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.
Latest posts by Niall Cooling (see all)
- Disassembling a Cortex-M raw binary file with Ghidra - December 20, 2022
- Using final in C++ to improve performance - November 14, 2022
- Understanding Arm Cortex-M Intel-Hex (ihex) files - October 12, 2022
Part 1 Cache Basics
Instruction Cache Replacement Policy
Starting with the simpler instruction cache case; when we encounter a cache miss the normal policy is to evict the current cache line and replace it with the new cache line. This is known as a read-allocate policy and is the default on all instruction caches.
Cold start (first read)
It should also be noted that on system power-up the initial state of the cache is unknown. On the ARMv7-M all caches are disabled at reset. […]
Great Expectations
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.
He specialises in C++, UML, software modelling, Systems Engineering and process development.
Latest posts by Glennan Carnie (see all)
- Practice makes perfect, part 3 – Idiomatic kata - February 27, 2020
- Practice makes perfect, part 2– foundation kata - February 13, 2020
- Practice makes perfect, part 1 – Code kata - January 30, 2020
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 C++0x, C++11, C++1y, copy policy, design, functions, Modern C++, move policy, move semantics
2 Comments
Software Duct Tape – Binding the C++ Universe Together
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.
He specialises in C++, UML, software modelling, Systems Engineering and process development.
Latest posts by Glennan Carnie (see all)
- Practice makes perfect, part 3 – Idiomatic kata - February 27, 2020
- Practice makes perfect, part 2– foundation kata - February 13, 2020
- Practice makes perfect, part 1 – Code kata - January 30, 2020
One of the cornerstones of object-oriented design is the concept of objects interacting by sending messages to form mechanisms – units of higher-order (or ‘emergent’) behaviour.
In order to send a message (in this case, invoke a member function) an object must have a ‘link’ to the target object. That link is formed by building in an association between the two classes as part of the type’s definition.
In this article we look at building associations between classes and forming run-time links […]
Sailing the Seven C’s of design*
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.
He specialises in C++, UML, software modelling, Systems Engineering and process development.
Latest posts by Glennan Carnie (see all)
- Practice makes perfect, part 3 – Idiomatic kata - February 27, 2020
- Practice makes perfect, part 2– foundation kata - February 13, 2020
- Practice makes perfect, part 1 – Code kata - January 30, 2020
I’m always looking for nice little mnemonics to help out remember the important concepts in design. Here’s one for model-driven development I call the “Seven C’s”. It basically enumerates the seven stages a design goes through, from initial idea to code.
CONCEPT The Concept phase is about understanding the problem. In other words: requirements analysis. When you’re in Concept mode your main focus is on validation – am I solving the right problem for my […]
Posted in Design Issues
Tagged design, MDA, MDD, methodologies, modelling, techniques, UML
2 Comments
Elizabethan guidance on Object-Oriented software design
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.
He specialises in C++, UML, software modelling, Systems Engineering and process development.
Latest posts by Glennan Carnie (see all)
- Practice makes perfect, part 3 – Idiomatic kata - February 27, 2020
- Practice makes perfect, part 2– foundation kata - February 13, 2020
- Practice makes perfect, part 1 – Code kata - January 30, 2020
So what did the Elizabethans know about software development? Well, in truth, nothing whatsoever. But what they had begun to do is codify and systematise the knowledge and experience of masters in manuals, treatises and books. Some of the earliest documents of this form refer to the martial arts or, as it was known at the time the ‘Arts of Defence’
In martial arts one learns practical skills (in this case how to defend oneself against any enemy) through practice and […]
Posted in Design Issues
Tagged abstraction, cohesion, coupling, design, encapsulation, quality
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