# Unit GLASS library

<img src="https://static-cdn.m5stack.com/resource/docs/products/unit/Glass%20Unit/img-4384183e-b663-4dfc-bc3f-5070166c6e2b.webp">


Sample Code:
```
#include <M5UnitGLASS.h>

M5UnitGLASS display;

void setup(void)
{
// initialize
// 初期化
//                     SDA,         SCL,    Freq, I2C PortNumber
  display.init(GPIO_NUM_21, GPIO_NUM_22, 400000u);


// Set the display orientation
// ディスプレイの向きを設定
// 0 = 270 deg / 1 = normal / 2 = 90 deg / 3 = 180 deg / 4~7 = upside down
  display.setRotation(1);

  display.startWrite();
  for (int y = 0; y < display.height(); ++y)
  {
    for (int x = 0; x < display.width(); ++x)
    {
      display.drawPixel(x, y, display.color888(x*2, x*2+y*2, y*2));
    }
  }
  display.endWrite();

  for (int i = 0; i < 16; ++i)
  {
    int x = rand() % display.width();
    int y = rand() % display.height();
    display.drawCircle(x, y, 16, rand());
  }
}

bool buz_en = false;

void loop(void)
{
  static constexpr const char hello_str[] = "Hello Unit GLASS !";
  int i_end = -display.textWidth(hello_str);
  for (int i = display.width(); i > i_end; --i)
  {
    // get key A status : 0==pressed / 0!=released
    if (display.getKey(0) == 0) {
      buz_en = !buz_en;
      display.setBuzzerEnable(buz_en);
    }

    // get key B status : 0==pressed / 0!=released
    if (display.getKey(1) == 0) {
      display.setBuzzer((i - i_end) << 4, 128);
    }

    display.drawString(hello_str, i, (display.height() - display.fontHeight()) >> 1);
  }
  delay(5);
}
```