Test-driven 7-Segment Decoder

This article is about creating a 7-segment display decoder in software. While this is probably considered a rather trivial task, it will serve as a good example for the discipline of Test-Driven Development (TDD). The motivation for a test-driven approach in this case is simple: being able to refactor later... [Read More]

The bash debugger: an example

Sometimes you may find yourself in a situation where you need to actually debug a shell script you're currently writing. Especially in the initial phase of development, features like single-stepping feel quite handy. I this article we are going to look at two situations where the bash debugger (bashdb) is... [Read More]

AVR sleep mode for fun and profit (part 2)

In the first part of this article we managed to put the AVR into power-down mode and were thereby able to lower the current consumption in idle mode to 0.0 mA. While this is great compared to the 22 mA before any optimization, there is no way to wake up... [Read More]

AVR sleep mode for fun and profit

Today's blog article is about how to optimize the power consumption of an AVR microcontroller running on batteries. We're going to explore one of the ATmega32's sleep modes and how it affects power consumption. We will eventually reach a state where it actually makes sense to power the device from... [Read More]

Passing heavy C++ objects by value

Big objects are traditionally passed to methods by reference. Some weeks ago I talked to a colleague about that and decided to investigate a bit further. As a result of my research I must admit that, starting with C++11, things have indeed changed. Depending on what happens inside the body... [Read More]

Background make execution in Vim 8

Version 8 of the Vim text editor introduced a great new feature for executing processes asynchronously. In this article I'm going to show you a plugin that makes use of these async jobs and how I utilize them to build a C++ project in the background. [Read More]

Test-driving the MCP2515 CAN Controller (Part 2)

It turns out the device driver design established previously has a serious drawback. While the SpiDriver interface enables unit testing, the cost of polymorphism has to be paid also in production code. In this article you are going to see how high that cost is, i.e. how much extra code... [Read More]

Test-driving the MCP2515 CAN Controller (Part 1)

So you are pretty much into Test-Driven Development (TDD)? You love to practice it on your development machine but think it might be quite a hassle when it comes to writing code for small microcontrollers? In this blog article we are going to take a journey to Embedded TDD using... [Read More]