Tiny4kOLED

This is a library for an ATTiny85 to use an SSD1306 powered, double buffered, 128x32 pixel OLED, over I²C.

The SSD1306 has enough RAM to support a 128 by 64 pixel display, and most SSD1306 controlled OLEDs are 128 by 64 pixels. However there are also other display sizes available. With a 128 by 32 pixel display, only half of the SSD1306's RAM is used, and the other half can be used as a frame buffer. This results in being able to have a slow ATTiny85 gradually update the display, then switch it into view when it is ready.

This library is an adaption of DigisparkOLED which in turn is a modification of the Tinusaur project's SSD1306xLED library. I have extensively re-written it, with the following changes:

• Replaced Wire with TinyWireM (Digispark's Wire is a rename of TinyWireM, but Adafruit's includes a necessary bug fix.)
• Fixed the sending of multiple bytes per I²C transmission
• Changed the initialization to be two I²C transmissions, instead of using a transmission per command byte.
• Left the display off in the initialization, so that the display could be cleared before being shown.
• Altered the library to be for a 128x32 display.
• Added double buffering control code.
• Exposed all of the SSD1306 features.
• Optimised font usage, enabling custom fonts.

_{The 4k in the project name is because 128 multiplied by 32 is 4096. This library is for a display with only 4096 pixels, not for UHD displays.}