ChibiOS and STM32

ChibiOS is a compact and fast real-time operating system supporting multiple architectures. It offers a multi-threading scheduler and related APIs to manage threads scheduling and priorities, events and inter-thread communication. It also provide an Hardware Abstraction Layer.

STM32 is a broad family of 32-bit microcontrollers based on ARM Cortex-M architecture. With hundreds of different chips, STM32 covers a broad range of applications. Thanks to cheap and valuable development kits it is quite easy to evaluate them or create an prototype.

No matter what they say, you will not be able to appreciate the performance of these MCUs without a good scheduler. Here we will provide resources to getting started with STM32 development board using ChibiOS/RT as kernel and ChibiOS/HAL as drivers. Pick one and read it! If you like it don’t forget to Share the knowledge.

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Detecting obstacles using an ultrasonic sensor HC-SR04

Detecting obstacles using an ultrasonic sensor HC-SR04

HC-SR04 is a commonly used ultrasonic sensor which is capable to detect obstacles in a range of 2-300cm. The sensor looks like a small PCB having two metal cylinders on the front-side and a small circuit on the back-side (see Fig.1).

In this article we will provide a simple demo to use HC-SR04. This requires a preliminary read of the sensor user manual: HC-SR04 User Manual

The sensor has 4 PIN:

VCC, which must be connected to 5V; Trig, which is an input PIN to trigger the measurement; Echo, which is an output PIN which sent out a square wave; GND, which must be continue reading...

How to drive a HD44780 with I2C backpack with a STM32

How to drive a HD44780 with I2C backpack with a STM32

The HD44780 is a de-facto standard controller for display. We have already use it providing a source code to use a 16×2 LCD with a STM32. In this article we will step over introducing an I2C backpack for that display. Of course we will explain how to edit old code in order to get it work with this new hardware configuration.

Even if it is still popular, this controller was made commercially available in the late eighties. At that time serial communications were not so widespread because their were costly and involved constraint about clock speed. Because of that, the continue reading...

How to switch to the development version of ChibiOS

How to switch to the development version of ChibiOS

First time I started to deal with a software a little bit more complicated than the one used to print “Hello World”, I have encountered some words like “versioning”, “revision”, “diff”, “branch”, “trunk”, “checkout” and I heard about certain software like “svn”, “git”, “mercurial”.

Do you keep in mind when your friends knows something you don’t know and they continuously talk about that making you feel like a complete dumbass? Well that was my feeling! It is much simpler than how it seems: there are certain programs which purpose is to keep trace of every single character continue reading...

Getting started with mikroe BUZZ Click using ChibiOS/HAL

Getting started with mikroe BUZZ Click using ChibiOS/HAL

BUZZ Click is a click board with a mikroBus form factor. It is substantially composed of a piezoelectric speaker having a resonant frequency at 3.8 kHz: this means we should expect best performances at this frequency. Let’s take a look to the principle of operation of DC and AC buzzer.

A piezoelectric loudspeaker also known as buzzer uses the inverse piezoelectric effect for generating sound. The piezoelectricity is a phenomena where mechanical stress produces the accumulation of electrical charges and then a voltage across the material. The inverse principle is true continue reading...

Mikroe Clicker 2 for STM32 and STLink v2

Mikroe Clicker 2 for STM32 and STLink v2

In this tutorial we are going to see how to connect a STLink v2 debugger to a Clicker 2 for STM32 enabling users to do debugging which could be very useful in development phases. A debugger is a computer program which is used to test and debug another program usually named Target.

In embedded things are slightly different since the code is executed on an external MCU and it is required an interface Computer-MCU. In this case the Target is the MCU and a debugger is composed by the ensemble of a hardware and a software tool. Nonetheless, when the majority of people is continue reading...