占用资源有点大，一个 dmeo 用掉 uno 60% 的内存

制作图标， 我试了无效
https://icode.best/i/71467042039792

Image2Lcd2.9

   Adafruit_SSD1306* pLcd = nullptr; // 显示器控制器

// https://github.com/adafruit/Adafruit_SSD1306/blob/master/examples/ssd1306_128x64_i2c/ssd1306_128x64_i2c.ino
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

void testscrolltext(Adafruit_SSD1306 &display);

void testdrawbitmap(Adafruit_SSD1306 &display);

void testInvertDisplay(Adafruit_SSD1306 &display);

void testdrawchar(Adafruit_SSD1306 &display);

void testdrawstyles(Adafruit_SSD1306 &display);

Oled12864::Oled12864()
{
    //  -1 为忽略重置按钮
    pLcd = new Adafruit_SSD1306(128, 64, &Wire, -1);
}

Oled12864::~Oled12864()
{
    Log.infoln("lcd 类释放");

    if (pLcd != nullptr)
    {
        delete pLcd;
        pLcd = nullptr;
    }
}

// 初始时调用
void Oled12864::Setup()
{
    // 0x3C 是我的显示器的地址,
    if (!pLcd->begin(SSD1306_SWITCHCAPVCC, 0x3C))
    {
        Log.infoln("12864 初始化失败");
        this->inited = false;
        return;
    }

    Log.infoln("12864 初始化成功");
    this->inited = true;

    // 显示缓存区内容
    pLcd->display();
    delay(500);

    // 清空缓存区
    pLcd->clearDisplay();

    // 画一个点
    pLcd->drawPixel(10, 10, SSD1306_WHITE);
    delay(2000);

    testscrolltext(*pLcd);
    delay(1000);

    testdrawbitmap(*pLcd);
    delay(1000);

    testInvertDisplay(*pLcd);
    delay(1000);

    testdrawchar(*pLcd);
    delay(1000);

    testdrawstyles(*pLcd);
    delay(1000);
}

// 循环调用
void Oled12864::Loop()
{
    if (!this->inited)
    {
        return;
    }
}

// 滚屏显示
void testscrolltext(Adafruit_SSD1306 &display)
{

    display.clearDisplay();

    display.setTextSize(2); // Draw 2X-scale text
    display.setTextColor(SSD1306_WHITE);
    display.setCursor(10, 0);
    display.println(F("scroll"));
    display.display(); // Show initial text
    delay(100);

    // Scroll in various directions, pausing in-between:
    display.startscrollright(0x00, 0x0F);
    delay(1000);
    display.stopscroll();
    //   delay(2000);
    //   display.stopscroll();
    //   delay(1000);
    //   display.startscrollleft(0x00, 0x0F);
    //   delay(2000);
    //   display.stopscroll();
    //   delay(1000);
    //   display.startscrolldiagright(0x00, 0x07);
    //   delay(2000);
    //   display.startscrolldiagleft(0x00, 0x07);
    //   delay(2000);
    //   display.stopscroll();
    //   delay(1000);
}

// 画出点阵图
void testdrawbitmap(Adafruit_SSD1306 &display)
{
    display.clearDisplay();

    int LOGO_HEIGHT = 16;
    int LOGO_WIDTH = 16;
    static const unsigned char PROGMEM logo_bmp[] =
        {0b00000000, 0b11000000,
         0b00000001, 0b11000000,
         0b00000001, 0b11000000,
         0b00000011, 0b11100000,
         0b11110011, 0b11100000,
         0b11111110, 0b11111000,
         0b01111110, 0b11111111,
         0b00110011, 0b10011111,
         0b00011111, 0b11111100,
         0b00001101, 0b01110000,
         0b00011011, 0b10100000,
         0b00111111, 0b11100000,
         0b00111111, 0b11110000,
         0b01111100, 0b11110000,
         0b01110000, 0b01110000,
         0b00000000, 0b00110000};

    display.drawBitmap(
        (display.width() - LOGO_WIDTH) / 2,
        (display.height() - LOGO_HEIGHT) / 2,
        logo_bmp, LOGO_WIDTH, LOGO_HEIGHT, 1);
    display.display();
}

// 反向显示
void testInvertDisplay(Adafruit_SSD1306 &display)
{
    for (int i = 0; i < 5; i++)
    {
        display.invertDisplay(true);
        delay(1000);
        display.invertDisplay(false);
        delay(1000);
    }
}

// 输出文字
void testdrawchar(Adafruit_SSD1306 &display)
{

    display.clearDisplay();

    display.setTextSize(1);              // Normal 1:1 pixel scale
    display.setTextColor(SSD1306_WHITE); // Draw white text
    display.setCursor(0, 0);             // Start at top-left corner
    display.cp437(true);                 // Use full 256 char 'Code Page 437' font

    // Not all the characters will fit on the display. This is normal.
    // Library will draw what it can and the rest will be clipped.
    for (int16_t i = 0; i < 256; i++)
    {
        if (i == '\n')
            display.write(' ');
        else
            display.write(i);
    }

    display.display();
}

void testdrawstyles(Adafruit_SSD1306 &display)
{
    display.clearDisplay();

    display.setTextSize(1);              // Normal 1:1 pixel scale
    display.setTextColor(SSD1306_WHITE); // Draw white text
    display.setCursor(0, 0);             // Start at top-left corner
    display.println(F("Hello, world!"));

    display.setTextColor(SSD1306_BLACK, SSD1306_WHITE); // Draw 'inverse' text
    display.println(3.141592);

    display.setTextSize(2); // Draw 2X-scale text
    display.setTextColor(SSD1306_WHITE);
    display.print(F("0x"));
    display.println(0xDEADBEEF, HEX);

    display.display();
    delay(2000);
}