Unit LCD Arduino チュートリアル

#include <M5Unified.h>
#include <M5UnitLCD.h>

M5UnitLCD unit_lcd;
M5Canvas lcd_canvas(&unit_lcd);

void draw_function(LovyanGFX* gfx)
{
    int x      = rand() % gfx->width();
    int y      = rand() % gfx->height();
    int r      = (gfx->width() >> 4) + 2;
    uint16_t c = rand();
    gfx->fillRect(x - r, y - r, r * 2, r * 2, c);
}

void setup()
{
    auto cfg = M5.config();
    M5.begin(cfg);
    const int sda = M5.getPin(m5::pin_name_t::port_a_sda);
    const int scl = M5.getPin(m5::pin_name_t::port_a_scl);
    if (!unit_lcd.init(sda, scl, 400000)) {
        M5.Display.fillScreen(TFT_RED);
        M5.Display.setTextSize(2);
        M5.Display.setCursor(12, 32);
        M5.Display.println("Unit LCD init failed");
        while (true) {
            delay(1000);
        }
    }

    unit_lcd.setRotation(3);
    lcd_canvas.setColorDepth(16);
    lcd_canvas.createSprite(unit_lcd.width(), unit_lcd.height());
    lcd_canvas.fillScreen(TFT_BLACK);
    int textsize = lcd_canvas.height() / 60;
    if (textsize == 0) {
        textsize = 1;
    }
    lcd_canvas.setTextSize(textsize);
}

void loop()
{
    int x      = rand() % lcd_canvas.width();
    int y      = rand() % lcd_canvas.height();
    int r      = (lcd_canvas.width() >> 4) + 2;
    uint16_t c = rand();
    lcd_canvas.fillCircle(x, y, r, c);
    draw_function(&lcd_canvas);
    lcd_canvas.pushSprite(0, 0);
    unit_lcd.waitDisplay();
    delay(50);
}