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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STM32, ChibiOS and a 8×8 LED Matrix

STM32, ChibiOS and 8x8 LED Matrix

The MAX7219 is a compact, serial input/parallel output common-cathode display driver. Included on-chip there are a BCD code-B decoder, the multiplex scan circuitry, segment and digit drivers, and an 8×8 static RAM that stores each digit. Only one external resistor is required to set the segments current.

This chip is often used to drive 7-segment display having up to 8 digits or up to 64 individual LEDs. It is not unusual find this chip in DIY kits to be mounted on a small PCBs like that used in this article (See Fig. 1).

This chip could be found in different packages continue reading...

Port a ChibiOS based application to another platform

Port a ChibiOS based application to another platform

We already talked about ChibiOS/HAL design and its multiple architectures support. This is very important for regular developers: imagine a scenario in which you design an application using a certain MCU and after a first stage you decide to upgrade your application. Imagine also that hardware resources on the MCU you decided to use are not enough to make that upgrade. At that point you have to port application on another MCU and this could cost a big effort in terms of time/money. If your application is ChibiOS based and you followed some guidelines already introduced in continue reading...

A Radio Frequency transceiver library: nRF24L01 and ChibiOS/RT

A Radio Frequency transceiver library nRF24L01 and ChibiOS/RT

The nRF24L01 is one of the most popular RF transceiver as it is very cheap and it could be found already configured on small PCBs with needed passive components. This means that only a MCU is needed to design a radio system with the nRF24L01.

The nRF24L01 is a highly integrated, ultra low power 2Mbps RF transceiver IC for the 2.4GHz ISM band. It provides an hardware protocol accelerator, the Enhanced ShockBurst, enabling the implementation of advanced and robust wireless connectivity with low cost MCUs.

By this article we want to provide a full library for nRF24L01 continue reading...

How to use an HD44780 based Liquid Crystal Display

How to use an HD44780 based Liquid Crystal Display

The HD44780 is a controller for display developed by Hitachi commonly used to manage alphanumeric dot matrix LCD. This controller is a standard de-facto for this kind of display. It is often used in industrial test equipment, networking equipment, vending machine and in embedded projects.

Compatible LCD screens are manufactured in several standard configurations. Common sizes are one row of eight characters (1×8), as well as 16×2, 20×2 and 20×4 formats. Larger custom sizes are made with 32, 40 and 80 characters and with 1, 2, 4 or 8 lines. The most commonly manufactured continue reading...

Using DHT11 with ChibiOS/RT

Using DHT11 with ChibiOS/RT

The DHT11 is a basic, low-cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, and spits out a digital signal on the data pin (no analog input pins needed).

The communication on data pin occurs according to a non-standard protocol known as One-Wire protocol.

In this article we want to provide a demonstration for DHT11 compatible with ChibiOS/HAL 3.0, but also explain concepts inside that demo. Following that purpose we need for the DHT11 datasheet.

DHT11 Datasheet

Typical circuit requires a continue reading...