Adafruit-SSD1351-library 
This is a library for the Adafruit SSD1351 OLED display products:
Check out the links above for our tutorials and wiring diagrams. These displays use SPI to communicate, 4 or 5 pins are required to interface (RST is optional).
Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit!
Written by Limor Fried/Ladyada for Adafruit Industries. BSD license, check license.txt for more information. All text above must be included in any redistribution.
To download. click the DOWNLOADS button in the top right corner, rename the uncompressed folder Adafruit_SSD1351. Check that the Adafruit_SSD1351 folder contains Adafruit_SSD1351.cpp and Adafruit_SSD1351.
Place the Adafruit_SSD1351 library folder your arduinosketchfolder/libraries/ folder. You may need to create the libraries subfolder if its your first library. Restart the IDE
Also requires the Adafruit_GFX library for Arduino.