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/*
* Copyright 2021 Birte Kristina Friesel
*
* SPDX-License-Identifier: BSD-2-Clause
*
* Driver for Solomon Systech SSD1306 OLED controller. Tested with
* 128x64 and 128x32 Displays.
*/
#ifndef SSD1306_H
#define SSD1306_H
#define SSD1306_SET_CONTRAST 0x81
#define SSD1306_SET_ENTIRE_ON 0xa4
#define SSD1306_SET_NORM_INV 0xa6
#define SSD1306_SET_DISP 0xae
#define SSD1306_SET_MEM_ADDR 0x20
#define SSD1306_SET_COL_ADDR 0x21
#define SSD1306_SET_PAGE_ADDR 0x22
#define SSD1306_SET_DISP_START_LINE 0x40
#define SSD1306_SET_SEG_REMAP 0xa0
#define SSD1306_SET_MUX_RATIO 0xa8
#define SSD1306_SET_COM_OUT_DIR 0xc0
#define SSD1306_SET_DISP_OFFSET 0xd3
#define SSD1306_SET_COM_PIN_CFG 0xda
#define SSD1306_SET_DISP_CLK_DIV 0xd5
#define SSD1306_SET_PRECHARGE 0xd9
#define SSD1306_SET_VCOM_DESEL 0xdb
#define SSD1306_SET_CHARGE_PUMP 0x8d
#include <stdint.h>
#include <stddef.h>
class SSD1306 {
private:
const uint8_t width = SSD1306_WIDTH;
const uint8_t height = SSD1306_HEIGHT;
SSD1306(const SSD1306 ©);
unsigned char const address = 0x3c;
unsigned char txbuf[130];
unsigned char rxbuf[2];
/*
* Adjust both SSD1306_SET_SEG_REMAP and SSD1306_SET_COM_OUT_DIR for
* 180° rotation.
*/
const unsigned char init1[6] = {
// Turn off power for configuration
SSD1306_SET_DISP | 0x00,
#ifdef CONFIG_driver_ssd1306_mode_horizontal
/*
* Enable Horizontal Addressing Mode. Assuming image data is {A, B, C,
* ..., a, b, c, ...}, each byte corresponds to a 1x8 column, starting
* at the top left corner and proceeding to the right and then down:
*
* A7 B7 C7 ...
* .. .. .. ...
* A0 B0 C0 ...
* a7 b7 c7 ...
* .. .. .. ...
* a0 b0 c0 ...
*/
SSD1306_SET_MEM_ADDR, 0x00,
#endif
#ifdef CONFIG_driver_ssd1306_mode_vertical
/*
* Enable Vertical Addressing Mode. Assuming image data is {A, B, C,
* ..., a, b, c, ...}, each byte corresponds to a 1x8 column, starting
* at the top left corner and proceeding down and then to the right:
*
* A7 a7 ...
* .. .. ...
* A0 a0 ...
* B7 b7 ...
* .. .. ...
* B0 b0 ...
* .. .. ...
*/
SSD1306_SET_MEM_ADDR, 0x01,
#endif
// RAM line 0 == display line 0
SSD1306_SET_DISP_START_LINE | 0x00,
/*
* Horizontal Layout: Column 127 is SEG0.
* This depends on the connection between SSD1306 and OLED.
* Use 0x00 if your content is horizontally mirrored.
*/
SSD1306_SET_SEG_REMAP | 0x01,
/*
* Multiplex ratio is the number of display lines
* (i.e., the display height)
*/
SSD1306_SET_MUX_RATIO
};
// height-1 sent by init()
const unsigned char init2[4] = {
/*
* Vertical Layout: Scan from COM63 to COM0.
* This depends on the connection between SSD1306 and OLED.
* Use 0x00 if your content is vertically mirrored.
*/
SSD1306_SET_COM_OUT_DIR | 0x08,
// No vertical display offset
SSD1306_SET_DISP_OFFSET, 0x00,
/*
* COM PIN layout depends on display height and type. See
* datasheet and init().
*/
SSD1306_SET_COM_PIN_CFG
};
// height == 32? 0x02 : 0x12
const unsigned char init3[19] = {
/*
* Set clock to recommended values: 370 kHz (bits 7..4),
* no divider (bits 3..0). Increase divider for glitchy effects.
* The datasheet is unclear on the clock frequency range.
*/
SSD1306_SET_DISP_CLK_DIV, 0x80,
/*
* Set line (multiplex) precharge times.
* phase 1 (discharge pixels to avoid effects from the previous line): 8 cycles
* phase 2 (charge pixels for next line): 8 cycles
* decrease phase 1 time for glitchy effects.
*/
SSD1306_SET_PRECHARGE, 0x88,
/*
* VCOM deselect level. Unknown.
* 0x00: ~0.65 VCC
* 0x20: ~0.77 VCC
* 0x30: ~0.85 VCC
*/
SSD1306_SET_VCOM_DESEL, 0x30,
// start with medium contrast
SSD1306_SET_CONTRAST, 0x80,
// display content == RAM content
SSD1306_SET_ENTIRE_ON,
// regular (uninverted) display
SSD1306_SET_NORM_INV | 0x00,
// Enable charge pump (provide power to the display)
SSD1306_SET_CHARGE_PUMP, 0x14,
// turn on display
SSD1306_SET_DISP | 0x01,
// reset column pointer
SSD1306_SET_COL_ADDR, 0, 127,
// reset page pointer
SSD1306_SET_PAGE_ADDR, 0, 7
};
void writeCommand(uint8_t command);
void writeData(unsigned char* data);
public:
SSD1306() {}
void init();
void setContrast(unsigned char contrast);
void setInvert(bool invert);
void showImage(unsigned char* data, uint16_t length);
};
extern SSD1306 ssd1306;
#endif
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