C Library for SSD1306 0.96" OLED display

SSD1306 Description

Detailed information are described in Datasheet SSD1306.

Library

C library is aimed for driving SSD1306 0.96" OLED display 128x64 through TWI's Atmega328p.

Versions

• 1.0 - basic functions.
• 2.0 - change whole logic -> rebuild to cacheMemLcd array. It means that every request is stored in cache array and then is depicted on the display by function SSD1306_UpdateScreen (uint8_t). Added new function -> SSD1306_DrawLine (uint8_t, uint8_t, uint8_t, uint8_t).

Dependencies

• font.c
• font.h
• twi.c
• twi.h

Font.c can be modified according to application requirements with form defined in font.c. Maximal permissible horizontal dimension is 8 bits.

Usage

Prior defined for MCU Atmega328p / Atmega8 / Atmega16. Need to be carefull with TWI ports definition.

PORT	Atmega16	Atmega8 / Atmega328
SCL	PC0	PC5
SDA	PC1	PC4

Tested

Library was tested and proved on a SSD1306 0.96″ OLED Dispay with Atmega328p.

Init OLED Sequence

Init sequence OLED display was defined according to page 64 (next to last page) of Datasheet SSD1306.

// +---------------------------+
// |      Set MUX Ratio        |
// +---------------------------+
// |        0xA8, 0x3F         |
// +---------------------------+
//              |
// +---------------------------+
// |    Set Display Offset     |
// +---------------------------+
// |        0xD3, 0x00         |
// +---------------------------+
//              |
// +---------------------------+
// |  Set Display Start Line   |
// +---------------------------+
// |          0x40             |
// +---------------------------+
//              |
// +---------------------------+
// |     Set Segment Remap     |
// +---------------------------+
// |       0xA0 / 0xA1         |
// +---------------------------+
//              |
// +---------------------------+
// |   Set COM Output Scan     |
// |        Direction          |
// +---------------------------+
// |       0xC0 / 0xC8         |
// +---------------------------+
//              |
// +---------------------------+
// |   Set COM Pins hardware   |
// |       configuration       |
// +---------------------------+
// |        0xDA, 0x02         |
// +---------------------------+
//              |
// +---------------------------+
// |   Set Contrast Control    |
// +---------------------------+
// |        0x81, 0x7F         |
// +---------------------------+
//              |
// +---------------------------+
// | Disable Entire Display On |
// +---------------------------+
// |          0xA4             |
// +---------------------------+
//              |
// +---------------------------+
// |    Set Normal Display     |
// +---------------------------+
// |          0xA6             |
// +---------------------------+
//              |
// +---------------------------+
// |    Set Osc Frequency      |
// +---------------------------+
// |       0xD5, 0x80          |
// +---------------------------+
//              |
// +---------------------------+
// |    Enable charge pump     |
// |        regulator          |
// +---------------------------+
// |       0x8D, 0x14          |
// +---------------------------+
//              |
// +---------------------------+
// |        Display On         |
// +---------------------------+
// |          0xAF             |
// +---------------------------+

Functions

• SSD1306_Init (uint8_t) - Init display
• SSD1306_ClearScreen (void) - Clear screen
• SSD1306_NormalScreen (uint8_t) - Normal screen
• SSD1306_InverseScreen (uint8_t) - Inverse screen
• SSD1306_SetPosition (uint8_t, uint8_t) - Set position
• SSD1306_DrawChar (char) - Draw specific character
• SSD1306_DrawString (char*) - Draw specific string
• SSD1306_UpdateScreen (uint8_t) - Update content on display
• SSD1306_DrawLine (uint8_t, uint8_t, uint8_t, uint8_t) - Draw line

Demonstration

Links

• Datasheet SSD1306