xpcc: C++ microcontroller framework Build Status#

The xpcc framework consists of powerful hardware abstraction layers for many different microcontrollers, a set of drivers for various external targets and a general purpose toolbox for building hardware orientated applications.

The main goal of xpcc is to provide a usable API for barebone microcontroller programming, which is efficient enough to be deployed on a small ATtiny, yet powerful enough to make use of advanced capabilities found on the 32bit ARM Cortex-M.

xpcc is battle-tested in the real-world, highly competitive environment of Eurobot. It is the foundation of all of @RCA_eV's robot code, and is the culmination of many years worth of effort, experience and improvements.

This project also has guide for developers as well as a technical blog to document larger design concepts.

The source code is freely available under a 3-clause BSD license, so feel free to fork this project and adapt it to your needs. The only thing we ask of you is to contribute your changes back. That way everyone can profit.

Features#

  • Efficient and fast object-oriented C++11 API.
  • Support of AVR and ARM Cortex-M based microcontrollers from Atmel, ST and NXP.
  • Build system based on SCons and extendable using Python.
  • Data-driven HAL generation using Jinja2 template engine.
  • No memory allocations in HAL with very low overall RAM consumption.
  • Cross platform peripheral interfaces incl. bit banging:
    • GPIO & GPIO expanders
    • ADC
    • UART, I2C, SPI
    • CAN
  • Interfaces for external I2C and SPI device drivers.
  • Debug/logging system with IOStream interface.
  • Lightweight, stackless threads and resumable functions using cooperative multitasking.
  • Useful mathematical and geometric algorithms optimized for microcontrollers.
  • Lightweight unit testing system (suitable for AVRs).
  • Graphical user interface for small binary displays.

Supported hardware#

Here is a list of supported and tested microcontrollers and development boards:

Controller Development Board Support
AT90can custom ★★★
ATtiny44a custom ★★★
ATtiny85 custom ★★★
ATmega328p Arduino Uno ★★★
STM32F072 STM32F072 Discovery ★★★★
STM32F100 STM32F1 Discovery ★★★★
STM32F103 STM32F103 Nucleo ★★★★
STM32F303 STM32F3 Discovery ★★★★★
STM32F407 STM32F4 Discovery ★★★★★
STM32F429 STM32F429 Discovery ★★★★★
STM32F469 STM32F469 Discovery ★★★★
STM32F746 STM32F7 Discovery ★★★★
LPC11C24 LPCxpresso ★★

All of these targets are compiling and booting correctly (★) and have GPIO and UART working (★★). Most targets have support for basic peripherals, like I2C, SPI and ADC (★★★) as well as complicated peripherals, like Timers, CAN and external memory (★★★★). We also use a few targets in everyday development, which are very well tested (★★★★★).

Please see our examples for a complete list of tested projects.

Your target#

While the xpcc API is designed to be portable, we are only a small team of developers and are limited in the amount of platforms we can support and test in hardware. The following microcontrollers should be able to compile, but have not been tested extensively in hardware:

  • All AT90 targets
  • All ATtiny targets
  • All ATmega targets
  • All STM32F0 targets
  • All STM32F1 targets
  • All STM32F3 targets
  • All STM32F4 targets
  • All STM32F7 targets

There are more platforms which we have prepared, but currently not finished support for (Xmega, STM32F2, STM32L). Drop us an email to ask if your specific target is supported out-of-the-box and what you can do if it's not.

Who we are#

During the last decade the Roboterclub Aachen e.V. has developed a software library for communication among components that are distributed on PCs and microcontrollers. This library was used in autonomous robots for the Eurobot competition.

In 2009, xpcc became a separate project and since then focussed on a new approach to cross target microcontroller libraries. Over the years xpcc grew from a communication library to a general purpose framework suitable for all kinds of embedded applications.

The xpcc project is maintained by Niklas Hauser (@salkinium) and Kevin Läufer (@ekiwi) with significant contributions from Fabian Greif (@dergraaf), Daniel Krebs (@daniel-k), @georgi-g and @thundernail.

Have a look at the quarter finals of the Eurobot 2015 competition. Both our robots are running xpcc and starting from the right: