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Yocto: How to add packages to the SDK?
Normally a Yocto SDK includes all dependencies that are needed to build everything on your target image. But how can you add something to your SDK specifically? That might be useful if you want to build software components that are not included in your final image or you might want to provide developers with some development tools.
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Yocto: Recipe flavors
If you have done some Yocto development you might already have encounter them in the wild…
nativeandnativesdkrecipes… Recipes cannot only be built for the target, but also for your build host or your SDK host. This post gives a short summary about what the different recipe “flavors” are used for and how to add them to your recipes. -
C++ Design Patterns: Low effort observers
Another classic Gang of Four Pattern is the Observer Pattern. In this pattern, observers want to be notified about state changes of a subject. In this post we will look how to easily implement this with
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C++ Design Patterns: A Modern Command Pattern
Don’t worry. This is not yet another take on the classic Gang of Four Command Pattern. Instead we look at how we can use modern C++ features to solve the same problem in a different way. Namely we want to send commands to a (possibly) remote application, whilst choosing a testable and maintainable design.
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C++ Design Patterns: Template Method - no templates involved
Assume you have something that has an overall structure, but some parts of it need to be customized depending on the use case. The idea of the Template Method pattern is to define the overall structure in a base class and let the derived classes override the specific behavior.
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Back to basics: C++ Inheritance in a nutshell
C++ is an object-oriented language and inheritance can be used to define relationships between objects in the form of class hierarchies. It provides a mean to structure and organize your code. Assuming that you already know the basics of inheritance, we will look at how and when to best use it. Especially we look at how to use it for runtime and compile time polymorphism.
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C++ Design Patterns: Singleton - the Classic
The singleton is one of the simplest object-oriented C++ patterns. Probably due to its simplicity, it is also an often misused one. It is easy to implement your own, and therefore one might tend to use it a bit too often as a design choice. When should you use a singleton then? The answer is quite obvious, when you need a unique global object. However remember, global variables are usually frowned upon and you shouldn’t treat a singleton any other way. Avoid global variables as much as you can, but in some cases they are valid design decisions.
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Back to basics: How to organize your C/C++ project
Back to basics. When I started C++ programming I had a hard time figuring out how to organize my projects. Most text books or lectures were more focused on teaching either programming principles or language features. So in this post I would like to share what is in my opinion the best project structure.
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Yocto: Build your own linux distribution
In this post we are going to create our own yocto layer. The Yocto Project is an open source project that lets you create your own embedded linux distribution. You create recipes that are bundled into layers (which are usually called
meta-something). The recipes consist themselves of tasks (do_compile,do_install…) and let you specify dependencies between tasks. These recipes are then baked into an image with yocto’s build system calledbitbake. The generated outputs of a recipe are called packages (one recipe can provide several packages).
