Code error with a ex arduino library

[ScruffR]

Your project structure isn't quite correct
It should rather look like shown here

Undefined Reference Error on Compile

The structure of the library is not correct IMO and it is missing a library.properties file. This would be how a valid project structure should look like >. │ project.properties │ README.md │ ├───.vscode │ launch.json │ settings.json │ ├───lib │ └───yourLib │ │ library.properties │ │ LICENSE.txt │ │ README.md │ │ │ └───src │ yourLib.h │ yourLib.cpp │ ├───src yourProject.cpp yourProject.ino

To get started with developing/porting a library in Particle workbench you can follow the steps as outlined here (obviously with some adaptations for your own library)

Adafruit_ST7789.h: No such file or directory

Welcome to the community This repository is not providing a library as such but only a project that can work with that display. That’s most noticeable by the fact that there is a project.properties file and not a library.properties file. If you want to use this as a library, you’d run Particle: Create New Project Particle: Launch CLI therein run mkdir lib lib/Adafruit_ST7789 && cd lib/Adafruit_ST7789 && particle library create --name Adafruit_ST7789 --version 0.0.1 --author "Adafruit …