About

Easy "clone and go" repository for a libopencm3 + FreeRTOS based project.

Prerequisites

1. Install GNU Make

sudo apt install make

2. Install GCC ARM Toolchains

Download the toolchans from https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/downloads

Choose AArch32 bare-metal target (arm-none-eabi) under your host system.

Extract the compressed file, move it to /opt and set the proper permissions.

tar xvf gcc-arm-none-eabi-10.3-2021.10-x86_64-linux.tar.bz2 
cd /opt/gcc-arm/
sudo mv ~/Backup/linux/gcc-arm-none-eabi-10.3-2021.10/ .
sudo chown -R root:root gcc-arm-none-eabi-10.3-2021.10/

Check the version

/opt/gcc-arm/gcc-arm-none-eabi-10.3-2021.10/bin/arm-none-eabi-gcc --version

Instructions

Checkout, if you have an older git, or got ahead of yourself and skipped the --recurse-submodules you can fix things by running git submodule update --init (This is only needed once)

git clone --recurse-submodules https://github.com/IOsetting/libopencm3-freertos-template.git your-project

In case anything goes wrong when cloning the submodules

cd your-project
git submodule update --init --recursive

Build libopencm3, replace PREFIX=.. with your toolchains path

cd your-project
PREFIX=/opt/gcc-arm/gcc-arm-none-eabi-10.3-2021.10/bin/arm-none-eabi- make -C libopencm3

Build user project, replace PREFIX=.. with your toolchains path

PREFIX=/opt/gcc-arm/gcc-arm-none-eabi-10.3-2021.10/bin/arm-none-eabi- make -C user

Examples

There are some example codes under examples folder, categoried by none-os and rtos. To try the code, just copy them to user and compile. Compile argument FREERTOS=1 is required when compiling rtos examples, e.g.

PREFIX=/opt/gcc-arm/gcc-arm-none-eabi-10.3-2021.10/bin/arm-none-eabi- FREERTOS=1 make -C user

Directories

• user/
  contains your application
• freertos/
  contains FreeRTOS kernel source code
• libopencm3/
  contains libopencm3 source code
• examples/
  non-os and rtos demo codes

License

This template should be considered released into the public domain. This only applies to the template code. libopencm3 and FreeRTOS themselves has their own licenses. You should replace this license with the license of your own project if you are using this as a template.