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diff --git a/Marlin/src/lcd/dwin/e3v2/rotary_encoder.h b/Marlin/src/lcd/dwin/e3v2/rotary_encoder.h
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+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+/*****************************************************************************
+  * @file     rotary_encoder.h
+  * @author   LEO / Creality3D
+  * @date     2019/07/06
+  * @version  2.0.1
+  * @brief    Rotary encoder functions
+  ****************************************************************************/
+
+#include "../../../inc/MarlinConfig.h"
+
+/*********************** Encoder Set ***********************/
+
+typedef struct {
+  bool enabled = false;
+  int encoderMoveValue = 0;
+  millis_t lastEncoderTime = 0;
+} ENCODER_Rate;
+
+extern ENCODER_Rate EncoderRate;
+
+typedef enum {
+  ENCODER_DIFF_NO    = 0,  // no state
+  ENCODER_DIFF_CW    = 1,  // clockwise rotation
+  ENCODER_DIFF_CCW   = 2,  // counterclockwise rotation
+  ENCODER_DIFF_ENTER = 3   // click
+} ENCODER_DiffState;
+
+// Encoder initialization
+void Encoder_Configuration();
+
+// Analyze encoder value and return state
+ENCODER_DiffState Encoder_ReceiveAnalyze();
+
+/*********************** Encoder LED ***********************/
+
+#if PIN_EXISTS(LCD_LED)
+
+  #define LED_NUM  4
+  #define LED_DATA_HIGH  WRITE(LCD_LED_PIN, 1)
+  #define LED_DATA_LOW   WRITE(LCD_LED_PIN, 0)
+
+  #define RGB_SCALE_R10_G7_B5  1
+  #define RGB_SCALE_R10_G7_B4  2
+  #define RGB_SCALE_R10_G8_B7  3
+  #define RGB_SCALE_NEUTRAL_WHITE RGB_SCALE_R10_G7_B5
+  #define RGB_SCALE_WARM_WHITE    RGB_SCALE_R10_G7_B4
+  #define RGB_SCALE_COOL_WHITE    RGB_SCALE_R10_G8_B7
+
+  extern unsigned int LED_DataArray[LED_NUM];
+
+  // LED light operation
+  void LED_Action();
+
+  // LED initialization
+  void LED_Configuration();
+
+  // LED write data
+  void LED_WriteData();
+
+  // LED control
+  //  RGB_Scale: RGB color ratio
+  //  luminance: brightness (0~0xFF)
+  void LED_Control(const uint8_t RGB_Scale, const uint8_t luminance);
+
+  // LED gradient control
+  //  RGB_Scale: RGB color ratio
+  //  luminance: brightness (0~0xFF)
+  //  change_Time: gradient time (ms)
+  void LED_GraduallyControl(const uint8_t RGB_Scale, const uint8_t luminance, const uint16_t change_Interval);
+
+#endif // LCD_LED