Add Unit RGB example

Author: Tinyu-Zhao

examples/Unit/Unit_RGB_U003/Unit_RGB_U003.ino

@@ -0,0 +1,52 @@
+/*
+*******************************************************************************
+* Copyright (c) 2023 by M5Stack
+*                  Equipped with M5CoreS3 sample source code
+*                          配套  M5CoreS3 示例源代码
+* Visit for more information: https://docs.m5stack.com/en/unit/rgb
+* 获取更多资料请访问: https://docs.m5stack.com/zh_CN/unit/rgb
+*
+* Describe: RGB.  多彩灯
+* Date: 2023/8/24
+*******************************************************************************
+Please connect to Port B(8,9),Control RGB Unit to scroll through three
+colors of red, green and blue.
+请连接端口B(8,9),控制RGB单元滚动红、绿、蓝三种颜色.
+*/
+
+#include <M5CoreS3.h>
+#include <Adafruit_NeoPixel.h>
+
+#define PIN       9  //定义NeoPixel的控制引脚
+#define NUMPIXELS 3  //定义NeoPixel控制灯灯数量
+
+Adafruit_NeoPixel pixels = Adafruit_NeoPixel(
+    NUMPIXELS, PIN,
+    NEO_GRB + NEO_KHZ800);  // set number of LEDs, pin number, LED type.
+                            // 设置灯的数量,控制引脚编号,灯灯类型
+
+void setup() {
+    M5.begin();  // Init M5CoreS3.  初始化M5CoreS3
+    M5.Axp.powerModeSet(POWER_MODE_USB_IN_BUS_OUT);
+    pixels.begin();  // Init the NeoPixel.  初始化NeoPixel
+    M5.Lcd.setTextSize(2);
+    M5.Lcd.setCursor(90, 0);
+    M5.Lcd.println(("RGB Example"));
+}
+
+int i = 0, j = 1, k = 2;
+
+void loop() {
+    pixels.setPixelColor(i++, pixels.Color(100, 0, 0));  // Bright red
+    pixels.setPixelColor(j++, pixels.Color(0, 100, 0));  // Bright green
+    pixels.setPixelColor(k++, pixels.Color(0, 0, 100));  // Bright blue
+    pixels.show();  // sends the updated color to the hardware.
+                    // 将更新后的颜色发送到硬件。
+    delay(100);
+    if (i == 3)
+        i = 0;
+    else if (j == 3)
+        j = 0;
+    else if (k == 3)
+        k = 0;
+}

src/M5CoreS3.cpp

@@ -22,8 +22,8 @@ void M5CoreS3::begin(bool LCDEnable, bool USBSerialEnable, bool I2CEnable) {
 
     if (LCDEnable) {
         Axp.coreS3_init();
-        Lcd.clear();
         Lcd.begin();
+        Lcd.clear();
     }
 
     if (I2CEnable) {