Hardware abstraction layer

This directory contain platform specific implementation of hardware abstraction layer.

• arduino dir: for all Arduino platforms (if you use Arduino IDE)
• avr dir: for plain avr-gcc environment
• esp dir: for plain esp8266/esp32 environment
• linux dir: for linux platforms including raspberry pi
• mingw dir: for running under windows
• stm32 dir: for plain stm32 support (not implemented)

Edit UserSettings.h header file, if you want to disable some parts of ssd1306 library to reduce memory consumption in your project