INTEGRATING ARDUINO LIBRARY IN ESP-IDF

Make sure to use latest ESP-IDF & Arduino released version
We are going to integrate SparkFun_u-blox_GNSS_Arduino_Library as a component to our sample ESP-IDF project.
This Sparkfun library is taken as an example so you could use any other library you need.

Detailed Steps below

1. Clone my ESP-IDF C++ template git clone https://github.com/sukesh-ak/ESP-IDF-CPP-Template.git
2. Set device target idf.py set-target esp32 (or esp32s2 / esp32c3 / esp32s3)
3. Change firmware/project name in CMakeLists.txt file in the root CMakeLists.txt
4. Create components folder mkdir components && cd components
5. Add Arduino as submodule with folder name arduino

git submodule add https://github.com/espressif/arduino-esp32.git arduino 

6. Add SparkFun_u-blox_GNSS_Arduino_Library as submodule with folder name SparkFun_u-blox_GNSS

git submodule add https://github.com/sparkfun/SparkFun_u-blox_GNSS_Arduino_Library.git SparkFun_u-blox_GNSS

7. Create CMakeLists.txt file inside the SparkFun_u-blox_GNSS library folder

# CMakeFiles.txt inside "SparkFun_u-blox_GNSS" folder
cmake_minimum_required(VERSION 3.5)
idf_component_register(SRCS "src/SparkFun_u-blox_GNSS_Arduino_Library.cpp"
                    INCLUDE_DIRS "src/."
                    REQUIRES "arduino" # Library requires Arduino
                    )

project(SparkFun_u-blox_GNSS)

8. Update CMakeLists.txt file in the main folder
   See the file content here CMakeLists.txt

# Application requires SparkFun_u-blox_GNSS
set(COMPONENT_REQUIRES "SparkFun_u-blox_GNSS")
idf_component_register(SRCS "main.cpp"
                    INCLUDE_DIRS ".")

9. Run idf.py menuconfig
10. Build idf.py build
11. Flash idf.py -p <serial-port> flash

Folder contents

The project contains one source file in C++ language main.cpp. The file is located in folder main.

ESP-IDF projects are built using CMake. The project build configuration is contained in CMakeLists.txt files that provide set of directives and instructions describing the project's source files and targets (executable, library, or both).

Below is short explanation of remaining files in the project folder.

├── CMakeLists.txt
├── components [step 4]
│   ├── arduino [submodules - step 5]
│   └── SparkFun_u-blox_GNSS [submodules - step 6]
│       └── CMakeLists.txt [created in Step 7]
├── main
│   ├── CMakeLists.txt
│   └── main.cpp
└── README.md                  This is the file you are currently reading

Credits

Sparkfun U-Blox GNSS Library