CoreMatrix Display ドットマトリクス表示

#include <M5Unified.h>

static constexpr int kSquareSize = 2;
static constexpr int kMinX = 1;
static constexpr int kMaxX = 13;

static int squareX = kMinX;
static int direction = 1;
static bool reachedRight = false;

static void drawFrame()
{
  M5.Display.startWrite();
  M5.Display.fillScreen(TFT_BLACK);
  M5.Display.drawRect(0, 0, 16, 16, TFT_WHITE);
  M5.Display.fillRect(squareX, 7, kSquareSize, kSquareSize, TFT_WHITE);
  M5.Display.endWrite();
  M5.Display.display();
}

static void drawOk()
{
  M5.Display.startWrite();
  M5.Display.fillScreen(TFT_BLACK);
  M5.Display.drawRect(0, 0, 16, 16, TFT_WHITE);
  M5.Display.setTextColor(TFT_WHITE, TFT_BLACK);
  M5.Display.setTextDatum(textdatum_t::middle_center);
  M5.Display.drawString("OK", 8, 8);
  M5.Display.endWrite();
  M5.Display.display();
}

void setup()
{
  auto cfg = M5.config();
  cfg.serial_baudrate = 115200;
  M5.begin(cfg);

  M5.Display.setColorDepth(8);
  M5.Display.setRotation(1);
  M5.Display.setBrightness(128);

  Serial.printf("CoreMatrix display: %d x %d\n",
                static_cast<int>(M5.Display.width()),
                static_cast<int>(M5.Display.height()));
  drawFrame();
}

void loop()
{
  squareX += direction;

  if (squareX >= kMaxX) {
    squareX = kMaxX;
    direction = -1;
    reachedRight = true;
  } else if (squareX <= kMinX) {
    squareX = kMinX;

    if (reachedRight) {
      drawFrame();
      delay(200);

      drawOk();
      delay(1000);

      reachedRight = false;
      direction = 1;
    }
  }

  drawFrame();
  delay(120);
}