Badger 2040 2 Factor Authanticator TOTP/HOTP

TOTP/HOTP implementation for Badger 2040.

Prerequisite

I have gathered all the required dependencies for developing C++ programs for Badger 2040 and created a bootstrap script to do the heavy lifting. However, the prerequisites are as listed below.

• Common dependencies
  • git
  • cmake
  • make
  • ninja-build
• Build dependencies for Fedora
  • gcc-arm-linux-gnu
  • arm-none-eabi-gcc-cs-c++
  • arm-none-eabi-gcc-cs
  • arm-none-eabi-binutils
  • arm-none-eabi-newlib
• Build dependencies for Ubuntu
  • gcc-arm-none-eabi
  • build-essential
  • gcc-arm-none-eabi
• Project dependencies
  • pimoroni-pico
  • pico-extras
  • pico-sdk

Project Related FAQs

How to create a new Badger 2040 program?

This part explains how to properly arrange source code for a Badger 2040 program for easy compiling and maintenance.

1. Clone the unmodified programexample directory and rename it (let it be example-too).

2. Add your source code files to the directory.

3. Modify the CMakeLists.txt in the new program directory to add source files and required options.

4. Add the following line at the end of this project's CMakeLists.txt

   add_subdirectory(example-too)
   

How to build the program?

If you have used the supplied bootstrap script, you should be able to see the build folder, please follow from steps in that case.

1. Install all the build dependencies for your distro and initialize all the submodules. Run the following command in the project root and then inside all three submodules pico-sdk, pico-extras, pimoroni-pico.

   git submodule update --init
   

2. Create a build directory.

   mkdir build && cd build
   

3. Generate CMake project. (Note: using Ninja for speedy compilation.)

   cmake .. -DPICO_BOARD=pimoroni_badger2040 -GNinja
   

4. Compile your project. Do not compile the whole project, only compile the project you need by specifying the name.

   ninja <program-name>
   

How to flash the programs to Badger 2040?

The Badger 2040 uses .ef2 files to flash any program. You can upload MicroPython, CircuitPython or custom-built images. Follow these steps to use your custom build images. You can add only one file at a time.

1. Hold boot/usr button on your badger and connect to your system. It will get mounted as RPI-RP2. There will be two files already, do not touch them.
2. Go to the build directory and find the corresponding <project-name>.ef2 file for your project.
3. Copy this file to the mounted RPI-RP2.
4. Your badger screen will flash and the program will load.
5. You can now test your program.

References

Where to buy Badger 2040?

• India
• WorldWide

Important Repositories

• Raspberry Pi Pico SDK
• Pimoroni Pico Libraries and Examples
• Raspberry Pi Pico Additional Library

Acknowledgments

• Original Pico C++ Boilerplate Project
• Compiling Raspberry Pi Pico C/C++ programs on Fedora by John Walicki
• The Badger Set - small C++ programs for the Badger2040 by Michael Bell

License

I've added the BSD 3-Clause License to match the license used in the project dependencies. You should review this and check it's appropriate for your project before publishing your code.