UPDATE: Please check the most recent post about this library at https://tinusaur.org/tag/ssd1306xled
I recently bought an OLED display 128×64 from eBay (http://www.ebay.com/sch/i.html?_nkw=OLED+128) – very inexpensive (about 4 euro) but when I finally received it I was surprised to see how small it was – I was expecting something that looked more like the Nokia 3310 LCD. So I thought – this is perfect for the Tinusaur Project. The 128×64 OLED is controlled by an SSD1306 circuit and could be interfaced over I²C. The first challenge that I faced was that all existing libraries that I found were for Arduino boards … and I wrote my own based, of course, on existing code – the SSD1306xLED library.
SSD1306xLED is a C library for working with the SSD1306 display driver to control dot matrix OLED/PLED 128×64 displays. It is intended to be used with the Tinusaur board but should also work with any other board based on ATtiny85 or similar microcontroller – ATtiny45/ATtiny25, even ATtiny13.
The code could be divided into 3 pieces: (1) communication over I²C with the SSD1306; (2) sending graphical commands to the display; (3) high-level functions such as printing characters.
The I²C communication part is based on modified IIC_wtihout_ACK library that is available on the Internet but its original website (http://www.14blog.com/archives/1358) is no longer functional. Basically, it made it work on ATtiny85 and Tinusaur.
The SSD1306xLED library still needs work and improvements.
The main location for the library is SSD1306xLED page.
The source code along with very simple example is available on Bitbucket at this address: https://bitbucket.org/tinusaur/ssd1306xled
The Tinusaur Project 