Detailed information are described in Datasheet SSD1306.
C library is aimed for driving 0.96" OLED display with SSD1306 driver 128x64 or 128x32 version through TWI's (I2C). Settings for particular versions:
- 128x64 version
- command argument SSD1306_SET_MUX_RATIO set to 0x3F (ssd1306.c)
- command argument SSD1306_COM_PIN_CONF set to 0x12 (ssd1306.c)
- END_PAGE_ADDR set to 7 (ssd1306.h)
- 128x32 version
- command argument SSD1306_SET_MUX_RATIO set to 0x1F (ssd1306.c)
- command argument SSD1306_COM_PIN_CONF set to 0x02 (ssd1306.c)
- END_PAGE_ADDR set to 3 (ssd1306.h)
- 1.0.0 - basic functions. The first publication.
- 2.0.0 - more changes:
- rebuild to 'cacheMemLcd' array approach. It means that every request is stored in 'cacheMemLcd' array (RAM) and by the SSD1306_UpdateScreen (uint8_t) function is printed on the display.
- added new function -> SSD1306_DrawLine (uint8_t, uint8_t, uint8_t, uint8_t). Possible depicted any line (horizontal, vertical, with slope).
- possible to use for more than 1 display (not tested).
- !!! ~1kB RAM memory consumption.
- 3.0.0 - simplified alphanumeric version
- displaying alphanumeric characters
- for one display applicable
- only few RAM bytes consumption
- !!! no graphic functions like drawLine
Font.c can be modified according to application requirements with form defined in font.c. Maximal permissible horizontal dimension is 8 bits.
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 |
Library was tested and proved with 0.96″ 128x64 and 128x32 OLED Display (SSD1306 driver) and Atmega328p.
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 |
// +---------------------------+
- 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
