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libraries/M5GFX/docs/UnitGLASS.md

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+# 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);
+}
+```