OLED屏幕SSD1306芯片（杂文）

https://wiki.dfrobot.com.cn/_SKU_DFR0486_Gravity_I2C_OLED-2864%E6%98%BE%E7%A4%BA%E5%B1%8F

https://github.com/olikraus/u8g2

https://github.com/olikraus/u8g2/wiki/u8x8setupcpp

#include <Arduino.h>
#include <SPI.h>
#include <U8x8lib.h>

/* Constructor */
U8X8_SSD1306_128X64_NONAME_4W_SW_SPI u8x8(/* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);

/* u8x8.begin() is required and will sent the setup/init sequence to the display */
void setup(void)
{
  u8x8.begin();
}

void loop(void)
{
  u8x8.setFont(u8x8_font_chroma48medium8_r);
  u8x8.drawString(0,0,"Hello World!");
  delay(1000);
}

https://github.com/olikraus/u8glib/wiki/device#ssd1306-128x64

#include "U8glib.h"

// setup u8g object, please remove comment from one of the following constructor calls
// IMPORTANT NOTE: The following list is incomplete. The complete list of supported
// devices with all constructor calls is here: https://github.com/olikraus/u8glib/wiki/device

U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NONE | U8G_I2C_OPT_DEV_0); // I2C / TWI

void drawColorBox(void)
{
    u8g_uint_t w, h;
    u8g_uint_t r, g, b;

    w = u8g.getWidth() / 32;
    h = u8g.getHeight() / 8;
    for (b = 0; b < 4; b++)
        for (g = 0; g < 8; g++)
            for (r = 0; r < 8; r++)
            {
                u8g.setColorIndex((r << 5) | (g << 2) | b);
                u8g.drawBox(g * w + b * w * 8, r * h, w, h);
            }
}

void drawLogo(uint8_t d)
{
#ifdef MINI_LOGO
    u8g.setFont(u8g_font_gdr17r);
    u8g.drawStr(0 + d, 22 + d, "U");
    u8g.setFont(u8g_font_gdr20n);
    u8g.drawStr90(17 + d, 8 + d, "8");
    u8g.setFont(u8g_font_gdr17r);
    u8g.drawStr(39 + d, 22 + d, "g");

    u8g.drawHLine(2 + d, 25 + d, 34);
    u8g.drawVLine(32 + d, 22 + d, 12);
#else
    u8g.setFont(u8g_font_gdr25r);
    u8g.drawStr(0 + d, 30 + d, "U");
    u8g.setFont(u8g_font_gdr30n);
    u8g.drawStr90(23 + d, 10 + d, "8");
    u8g.setFont(u8g_font_gdr25r);
    u8g.drawStr(53 + d, 30 + d, "g");

    u8g.drawHLine(2 + d, 35 + d, 47);
    u8g.drawVLine(45 + d, 32 + d, 12);
#endif
}

void drawURL(void)
{
#ifndef MINI_LOGO
    u8g.setFont(u8g_font_4x6);
    if (u8g.getHeight() < 59)
    {
        u8g.drawStr(53, 9, "code.google.com");
        u8g.drawStr(77, 18, "/p/u8glib");
    }
    else
    {
        u8g.drawStr(1, 54, "code.google.com/p/u8glib");
    }
#endif
}

void draw(void)
{
    if (u8g.getMode() == U8G_MODE_R3G3B2)
    {
        drawColorBox();
    }
    u8g.setColorIndex(1);
    if (U8G_MODE_GET_BITS_PER_PIXEL(u8g.getMode()) > 1)
    {
        drawLogo(2);
        u8g.setColorIndex(2);
        drawLogo(1);
        u8g.setColorIndex(3);
    }
    drawLogo(0);
    drawURL();
}

void setup(void)
{
    // flip screen, if required
    //u8g.setRot180();
}

void loop(void)
{

    // picture loop
    u8g.firstPage();
    do
    {
        draw();
        u8g.setColorIndex(1);
    } while (u8g.nextPage());

    // rebuild the picture after some delay
    delay(200);
}

https://www.jianshu.com/p/35e185051aa7