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avr-gcc-toolchain.cmake

A kit for building AVR microcontroller software with CMake and AVR GCC toolchain.

• Overview
• What will be required
• Get started
• Examples
• Licences

Overview

• An easy start. Just a few new commands with intuitive options.
• Ability to create libraries.

Firmware upload to the microcontroller is not supported and there are no plans to implement it yet.

What will be required

CMake at least version 3.10. However, to use the CMakePresets.json presets file, version 3.20 or higher is required.

Get started

It's easy:

• Copy the cmake folder to a convenient location, for example to the root of your project.

• In the main CMakeLists.txt add the find_package and the avr_configure_mcu commands with the required parameters, like this:

  cmake_minimum_required(VERSION 3.10)
  project(nixie LANGUAGES C CXX)
  find_package(AVR REQUIRED binutils libc)
  avr_configure_mcu(
          atmega168
          NAME         MY_MCU
          DEFINES      F_CPU=16000000UL
          OPTIONS      -Os -ffunction-sections -fdata-sections
          LINK_OPTIONS -Wl,--gc-sections
  )

• By using target_link_libraries add the MY_MCU target to all targets that contain code for the microcontroller.

• When calling cmake to configure the project, add the option -DCMAKE_TOOLCHAIN_FILE=path/to/avr-gcc-toolchain.cmake.

See documentation for details.

Examples

As an example, see the use of this toolchain in the nixie-in18 project.

Licences

The source code of the scripts for CMake is distributed under the MIT license. For licensing of examples, see the relevant documentation.