Installation

The driver is header-only. CMake generates fdo2_version.h and exposes an INTERFACE target hf::fdo2 for consumers.

Requirements

• C++17 (std::string_view, if constexpr, <cmath> helpers).
• CMake ≥ 3.16 for the root CMakeLists.txt.
• A byte-level UART (3.0 V signalling per FDO2-G2 data sheet; host IO must respect 3.3 V max on the module side).
• ESP-IDF ≥ 5.4 recommended; CI targets release/v5.5 (see examples/esp32/app_config.yml).

Repository layout

hf-fdo2-driver/
├── inc/                         ← public headers (`fdo2.hpp`, …)
├── cmake/
│   ├── hf_fdo2_build_settings.cmake
│   └── hf_fdo2Config.cmake.in
├── examples/esp32/              ← ESP-IDF example + `hf_fdo2` component wrapper
├── docs/                        ← this documentation (Jekyll + Doxygen input)
├── _config/                     ← Doxygen, Jekyll, clang-format, lychee, …
├── .github/workflows/          ← CI (build, lint, docs)
├── CMakeLists.txt
├── LICENSE
└── README.md

Submodule (recommended)

git submodule add https://github.com/N3b3x/hf-fdo2-driver.git third_party/hf-fdo2-driver
git submodule update --init --recursive third_party/hf-fdo2-driver

add_subdirectory(third_party/hf-fdo2-driver)
target_link_libraries(my_app PRIVATE hf::fdo2)

ESP-IDF component

See Examples for the shipped wrapper under examples/esp32/components/hf_fdo2/.

Doxygen (optional)

From the repository root:

doxygen _config/Doxyfile

HTML output is written under docs/html/ (ignored by Git).

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