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Copy pathSSD1306_SWI2C.cpp
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SSD1306_SWI2C.cpp
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/*
SSD1306_SWI2C.cpp - Display driver for SSD1306 display, icnludes TWI & Display Buffer
Copyright 2018, SytheZN, All rights reserved.
*/
#include "Arduino.h"
#include "SSD1306_SWI2C.h"
#include "Wire.h"
int _sda;
int _scl;
SSD1306::SSD1306(int sda, int scl)
{
_sda = sda;
_scl = scl;
twi_init();
display_init();
blank();
refresh();
}
static byte buf[32][16] = {
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
{0x00, 0x00, 0x00, 0x00, 0x00, 0x1F, 0xE0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
{0x00, 0x00, 0x00, 0x00, 0x00, 0x7F, 0xF8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
{0x00, 0x00, 0x00, 0x00, 0x01, 0xFF, 0xFE, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00},
{0x00, 0x00, 0x00, 0x00, 0x07, 0xF0, 0x3F, 0x80, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x38, 0x00},
{0x00, 0x00, 0x00, 0x00, 0x0F, 0x80, 0x07, 0xC0, 0x00, 0xE0, 0x10, 0x00, 0x00, 0x00, 0x38, 0x00},
{0x00, 0x00, 0x00, 0x00, 0x1F, 0x00, 0x03, 0xE0, 0x00, 0xF0, 0x38, 0x00, 0x00, 0x00, 0x38, 0x00},
{0x00, 0x00, 0x00, 0x00, 0x1E, 0x00, 0x01, 0xE0, 0x00, 0x70, 0x38, 0x00, 0x00, 0x00, 0x38, 0x00},
{0x00, 0x00, 0x00, 0x00, 0x3C, 0x00, 0x00, 0xF0, 0x00, 0x70, 0x78, 0x00, 0x00, 0x00, 0x78, 0x00},
{0x00, 0x00, 0x00, 0x00, 0x38, 0x00, 0x00, 0x78, 0x00, 0x70, 0xF0, 0x00, 0x00, 0x00, 0x78, 0x00},
{0x00, 0x00, 0x00, 0x00, 0x70, 0x70, 0x38, 0x38, 0x00, 0x78, 0xF0, 0x00, 0x00, 0x00, 0x70, 0x00},
{0x00, 0x00, 0x00, 0x00, 0x70, 0xF8, 0x7C, 0x38, 0x00, 0x39, 0xE0, 0x00, 0x00, 0x00, 0x70, 0x00},
{0x00, 0x00, 0x00, 0x00, 0xF0, 0xF8, 0x7C, 0x3C, 0x00, 0x3D, 0xC0, 0xF8, 0x10, 0x40, 0x70, 0x00},
{0x00, 0x00, 0x00, 0x00, 0xE0, 0x78, 0x78, 0x1C, 0x00, 0x1F, 0xC1, 0xFC, 0x38, 0xE0, 0x70, 0x00},
{0x00, 0x00, 0x00, 0x00, 0xE0, 0x00, 0x00, 0x1C, 0x00, 0x07, 0x83, 0xFC, 0x38, 0xE0, 0x70, 0x00},
{0x00, 0x00, 0x00, 0x00, 0xE0, 0x00, 0x00, 0x1C, 0x00, 0x07, 0x07, 0xDC, 0x79, 0xE0, 0x70, 0x00},
{0x00, 0x00, 0x00, 0x00, 0xE0, 0x00, 0x00, 0x1C, 0x00, 0x07, 0x07, 0x9C, 0x79, 0xE0, 0x30, 0x00},
{0x00, 0x00, 0x00, 0x00, 0xE0, 0x00, 0x00, 0x1C, 0x00, 0x0F, 0x0F, 0x3C, 0x73, 0xE0, 0x00, 0x00},
{0x00, 0x00, 0x00, 0x00, 0xE0, 0x00, 0x00, 0x1C, 0x00, 0x0F, 0x0F, 0x3E, 0x7F, 0xE0, 0x00, 0x00},
{0x00, 0x00, 0x00, 0x00, 0xF0, 0xC0, 0x0C, 0x3C, 0x00, 0x0E, 0x1E, 0x7E, 0x3F, 0xF0, 0x30, 0x00},
{0x00, 0x00, 0x00, 0x00, 0x70, 0xE0, 0x1C, 0x38, 0x00, 0x1E, 0x1F, 0xFE, 0x1F, 0x70, 0x78, 0x00},
{0x00, 0x00, 0x00, 0x00, 0x70, 0x70, 0x38, 0x38, 0x00, 0x1C, 0x1F, 0xFE, 0x00, 0x70, 0xF8, 0x00},
{0x00, 0x00, 0x00, 0x00, 0x38, 0x3F, 0xF0, 0x78, 0x00, 0x0C, 0x0F, 0xEE, 0x00, 0x70, 0xFC, 0x00},
{0x00, 0x00, 0x00, 0x00, 0x3C, 0x0F, 0xC0, 0xF0, 0x00, 0x00, 0x00, 0x06, 0x00, 0x70, 0x7C, 0x00},
{0x00, 0x00, 0x00, 0x00, 0x1E, 0x00, 0x01, 0xE0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x70, 0x00, 0x00},
{0x00, 0x00, 0x00, 0x00, 0x1F, 0x00, 0x03, 0xE0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x70, 0x00, 0x00},
{0x00, 0x00, 0x00, 0x00, 0x0F, 0x80, 0x07, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x10, 0xF0, 0x00, 0x00},
{0x00, 0x00, 0x00, 0x00, 0x07, 0xF0, 0x3F, 0x80, 0x00, 0x00, 0x00, 0x00, 0x3F, 0xF0, 0x00, 0x00},
{0x00, 0x00, 0x00, 0x00, 0x01, 0xFF, 0xFE, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3F, 0xE0, 0x00, 0x00},
{0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFC, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1F, 0xC0, 0x00, 0x00},
{0x00, 0x00, 0x00, 0x00, 0x00, 0x1F, 0xE0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}};
void SSD1306::display_init()
{
twi_start();
twi_send(CB_CTRL);
twi_send(CMD_DISP_OFF);
twi_send(CB_CTRL);
twi_send(CMD_CHARGE_PUMP);
twi_send(DATA_CHARGE_PUMP_ON);
twi_send(CB_CTRL);
twi_send(CMD_DISP_ON);
twi_send(CB_CTRL);
twi_send(CMD_CONTRAST);
twi_send(0x00);
twi_send(CB_CTRL);
twi_send(CMD_ADDRMODE);
twi_send(CMD_ADDRMODE_V);
twi_send(CB_CTRL);
twi_send(CMD_ADDR_HVCOL);
twi_send(0x00); //start address
twi_send(0x7F); //stop address
twi_send(CB_CTRL);
twi_send(CMD_ADDR_HVPAGE);
twi_send(0x00); //start page
twi_send(0x07); //stop page
twi_stop();
}
void SSD1306::set_pixel(const uint8_t x, const uint8_t y, const bool state)
{
const auto xb = x / 8, xbn = 7 - (x % 8);
if (xb >= 16 || y >= 32)
return;
if (state)
{
buf[y][xb] |= (0x01 << xbn);
}
else
{
buf[y][xb] &= ~(0x01 << xbn);
}
}
void SSD1306::blank()
{
twi_start();
twi_send(CB_DATA);
for (int i = 0; i < 1024; i++)
{
twi_send(0x80);
}
twi_stop();
}
void SSD1306::clear_buffer()
{
for (uint8_t y = 0; y < 32; y++)
{
for (uint8_t x = 0; x < 16; x++)
{
buf[y][x] = 0x00;
}
}
}
void SSD1306::refresh()
{
twi_start();
twi_send(CB_DATA);
for (uint8_t x = 0; x < 128; x++)
{
uint8_t xb = x / 8, xbn = 7 - (x % 8);
for (uint8_t y = 0; y < 32; y += 4)
{
twi_send(0b10101010 | (1 & (buf[y][xb] >> xbn)) | (1 & (buf[y + 1][xb] >> xbn)) << 2 | (1 & (buf[y + 2][xb] >> xbn)) << 4 | (1 & (buf[y + 3][xb] >> xbn)) << 6);
}
}
twi_stop();
}
void SSD1306::reinitialise()
{
display_init();
}
void SSD1306::resynchronize()
{
twi_start();
twi_send(CB_CTRL);
twi_send(CMD_ADDR_HVCOL);
twi_send(0x00); //start address
twi_send(0x7F); //stop address
twi_send(CB_CTRL);
twi_send(CMD_ADDR_HVPAGE);
twi_send(0x00); //start page
twi_send(0x07); //stop page
twi_stop();
}
void SSD1306::display_off()
{
twi_start();
twi_send(CB_CTRL);
twi_send(CMD_DISP_OFF);
twi_stop();
}
void SSD1306::twi_init()
{
Wire.begin(_sda, _scl);
Wire.setClock(400000);
}
int sendcount = 0;
void SSD1306::twi_start()
{
Wire.beginTransmission(ADDR_W);
sendcount = 0;
}
void SSD1306::twi_stop()
{
Wire.endTransmission();
}
void SSD1306::twi_send(byte val)
{
Wire.write(val);
sendcount++;
if (sendcount == 128)
{
twi_stop();
twi_start();
twi_send(CB_DATA);
}
}