Unlike other boards from Freescale, the FRDM-KL25Z has no potentiometer or analog components on it. But in many applications an ADC conversion is needed, so here we go with a tutorial reading in an external potentiometer with Eclipse, CodeWarrior and Processor Expert. For this tutorial I have a 10k Ohm linear potentiometer connected to the Freedom board:
Linear potentiometer with the FRDM-KL25Z
With the Zumo I have a base platform for cool robotics applications. So why not build a line following robot with this? Especially as Pololu offers a reflectance sensor array for it. The result is: I have a line following robot 🙂
Line Following ZumoBot
It turned out that things were not working out of the box with the FRDM-KL25Z board. So if you want to do the same thing, here are some tips how to make it working with the Freedom board.
In this post I tapped into how to print messages to a console using the Kinetis/Freedom board. I’m not a fan of printf() for multiple reasons: It is simply a bad thing for embedded systems programming. But as many have asked for it, here is how to say “hello” from the Freedom Board using printf():
Hello World on the Terminal
The great thing with Eclipse is that you can configure a lot. In general, I’m happy with most of the defaults in Eclipse and CodeWarrior. Here are my top 10 things I change in Eclipse to make it even better:
I think the most important tool for a firmware engineer is a Logic Analyzer. I always have one on my desk. Working in different locations, sometimes I forget to carry it with me. And for sure I would need it. To buy another one to compensate my laziness? Or maybe there is another solution? And here I stumbled over an article about the Logic Sniffer project recently: it is about an open source logic analyzer hardware and firmware project. What a cool idea! Why not using my FRDM-KL25Z Freedom board as a Logic Analyzer? Heck, that would be awesome 🙂
Logic Analyzer with the KL25Z Freedom Board
Either you hate it, or you love it: Line numbers in the Eclipse Editor:
Line Numbers in Eclipse Editor View
Personally, I love it!
Usually, one of the first things I see if I launch Eclipse is this dialog:
Select a Workspace Dialog
Actually, that ‘workspace’ thing is one of the most important things in Eclipse to understand. To mess around it can cause a lot of pain. So I have collected some ‘lessons learned’ around workspaces.
MCU on Eclipse 