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diff --git a/Marlin/src/lcd/dwin/dwin_lcd.cpp b/Marlin/src/lcd/dwin/dwin_lcd.cpp
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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/>.
+ *
+ */
+
+/********************************************************************************
+ * @file     dwin_lcd.cpp
+ * @author   LEO / Creality3D
+ * @date     2019/07/18
+ * @version  2.0.1
+ * @brief    DWIN screen control functions
+ ********************************************************************************/
+
+#include "../../inc/MarlinConfigPre.h"
+
+#if ENABLED(DWIN_CREALITY_LCD)
+
+#include "../../inc/MarlinConfig.h"
+
+#include "dwin_lcd.h"
+#include <string.h> // for memset
+
+//#define DEBUG_OUT 1
+#include "../../core/debug_out.h"
+
+// Make sure DWIN_SendBuf is large enough to hold the largest string plus draw command and tail.
+// Assume the narrowest (6 pixel) font and 2-byte gb2312-encoded characters.
+uint8_t DWIN_SendBuf[11 + DWIN_WIDTH / 6 * 2] = { 0xAA };
+uint8_t DWIN_BufTail[4] = { 0xCC, 0x33, 0xC3, 0x3C };
+uint8_t databuf[26] = { 0 };
+uint8_t receivedType;
+
+int recnum = 0;
+
+inline void DWIN_Byte(size_t &i, const uint16_t bval) {
+  DWIN_SendBuf[++i] = bval;
+}
+
+inline void DWIN_Word(size_t &i, const uint16_t wval) {
+  DWIN_SendBuf[++i] = wval >> 8;
+  DWIN_SendBuf[++i] = wval & 0xFF;
+}
+
+inline void DWIN_Long(size_t &i, const uint32_t lval) {
+  DWIN_SendBuf[++i] = (lval >> 24) & 0xFF;
+  DWIN_SendBuf[++i] = (lval >> 16) & 0xFF;
+  DWIN_SendBuf[++i] = (lval >>  8) & 0xFF;
+  DWIN_SendBuf[++i] = lval & 0xFF;
+}
+
+inline void DWIN_String(size_t &i, char * const string) {
+  const size_t len = _MIN(sizeof(DWIN_SendBuf) - i, strlen(string));
+  memcpy(&DWIN_SendBuf[i+1], string, len);
+  i += len;
+}
+
+inline void DWIN_String(size_t &i, const __FlashStringHelper * string) {
+  if (!string) return;
+  const size_t len = strlen_P((PGM_P)string); // cast it to PGM_P, which is basically const char *, and measure it using the _P version of strlen.
+  if (len == 0) return;
+  memcpy(&DWIN_SendBuf[i+1], string, len);
+  i += len;
+}
+
+// Send the data in the buffer and the packet end
+inline void DWIN_Send(size_t &i) {
+  ++i;
+  LOOP_L_N(n, i) { LCD_SERIAL.write(DWIN_SendBuf[n]); delayMicroseconds(1); }
+  LOOP_L_N(n, 4) { LCD_SERIAL.write(DWIN_BufTail[n]); delayMicroseconds(1); }
+}
+
+/*-------------------------------------- System variable function --------------------------------------*/
+
+// Handshake (1: Success, 0: Fail)
+bool DWIN_Handshake(void) {
+  #ifndef LCD_BAUDRATE
+    #define LCD_BAUDRATE 115200
+  #endif
+  LCD_SERIAL.begin(LCD_BAUDRATE);
+  const millis_t serial_connect_timeout = millis() + 1000UL;
+  while (!LCD_SERIAL && PENDING(millis(), serial_connect_timeout)) { /*nada*/ }
+
+  size_t i = 0;
+  DWIN_Byte(i, 0x00);
+  DWIN_Send(i);
+
+  while (LCD_SERIAL.available() > 0 && recnum < (signed)sizeof(databuf)) {
+    databuf[recnum] = LCD_SERIAL.read();
+    // ignore the invalid data
+    if (databuf[0] != FHONE) { // prevent the program from running.
+      if (recnum > 0) {
+        recnum = 0;
+        ZERO(databuf);
+      }
+      continue;
+    }
+    delay(10);
+    recnum++;
+  }
+
+  return ( recnum >= 3
+        && databuf[0] == FHONE
+        && databuf[1] == '\0'
+        && databuf[2] == 'O'
+        && databuf[3] == 'K' );
+}
+
+// Set the backlight luminance
+//  luminance: (0x00-0xFF)
+void DWIN_Backlight_SetLuminance(const uint8_t luminance) {
+  size_t i = 0;
+  DWIN_Byte(i, 0x30);
+  DWIN_Byte(i, _MAX(luminance, 0x1F));
+  DWIN_Send(i);
+}
+
+// Set screen display direction
+//  dir: 0=0°, 1=90°, 2=180°, 3=270°
+void DWIN_Frame_SetDir(uint8_t dir) {
+  size_t i = 0;
+  DWIN_Byte(i, 0x34);
+  DWIN_Byte(i, 0x5A);
+  DWIN_Byte(i, 0xA5);
+  DWIN_Byte(i, dir);
+  DWIN_Send(i);
+}
+
+// Update display
+void DWIN_UpdateLCD(void) {
+  size_t i = 0;
+  DWIN_Byte(i, 0x3D);
+  DWIN_Send(i);
+}
+
+/*---------------------------------------- Drawing functions ----------------------------------------*/
+
+// Clear screen
+//  color: Clear screen color
+void DWIN_Frame_Clear(const uint16_t color) {
+  size_t i = 0;
+  DWIN_Byte(i, 0x01);
+  DWIN_Word(i, color);
+  DWIN_Send(i);
+}
+
+// Draw a point
+//  width: point width   0x01-0x0F
+//  height: point height 0x01-0x0F
+//  x,y: upper left point
+void DWIN_Draw_Point(uint8_t width, uint8_t height, uint16_t x, uint16_t y) {
+  size_t i = 0;
+  DWIN_Byte(i, 0x02);
+  DWIN_Byte(i, width);
+  DWIN_Byte(i, height);
+  DWIN_Word(i, x);
+  DWIN_Word(i, y);
+  DWIN_Send(i);
+}
+
+// Draw a line
+//  color: Line segment color
+//  xStart/yStart: Start point
+//  xEnd/yEnd: End point
+void DWIN_Draw_Line(uint16_t color, uint16_t xStart, uint16_t yStart, uint16_t xEnd, uint16_t yEnd) {
+  size_t i = 0;
+  DWIN_Byte(i, 0x03);
+  DWIN_Word(i, color);
+  DWIN_Word(i, xStart);
+  DWIN_Word(i, yStart);
+  DWIN_Word(i, xEnd);
+  DWIN_Word(i, yEnd);
+  DWIN_Send(i);
+}
+
+// Draw a rectangle
+//  mode: 0=frame, 1=fill, 2=XOR fill
+//  color: Rectangle color
+//  xStart/yStart: upper left point
+//  xEnd/yEnd: lower right point
+void DWIN_Draw_Rectangle(uint8_t mode, uint16_t color,
+                         uint16_t xStart, uint16_t yStart, uint16_t xEnd, uint16_t yEnd) {
+  size_t i = 0;
+  DWIN_Byte(i, 0x05);
+  DWIN_Byte(i, mode);
+  DWIN_Word(i, color);
+  DWIN_Word(i, xStart);
+  DWIN_Word(i, yStart);
+  DWIN_Word(i, xEnd);
+  DWIN_Word(i, yEnd);
+  DWIN_Send(i);
+}
+
+// Move a screen area
+//  mode: 0, circle shift; 1, translation
+//  dir: 0=left, 1=right, 2=up, 3=down
+//  dis: Distance
+//  color: Fill color
+//  xStart/yStart: upper left point
+//  xEnd/yEnd: bottom right point
+void DWIN_Frame_AreaMove(uint8_t mode, uint8_t dir, uint16_t dis,
+                         uint16_t color, uint16_t xStart, uint16_t yStart, uint16_t xEnd, uint16_t yEnd) {
+  size_t i = 0;
+  DWIN_Byte(i, 0x09);
+  DWIN_Byte(i, (mode << 7) | dir);
+  DWIN_Word(i, dis);
+  DWIN_Word(i, color);
+  DWIN_Word(i, xStart);
+  DWIN_Word(i, yStart);
+  DWIN_Word(i, xEnd);
+  DWIN_Word(i, yEnd);
+  DWIN_Send(i);
+}
+
+/*---------------------------------------- Text related functions ----------------------------------------*/
+
+// Draw a string
+//  widthAdjust: true=self-adjust character width; false=no adjustment
+//  bShow: true=display background color; false=don't display background color
+//  size: Font size
+//  color: Character color
+//  bColor: Background color
+//  x/y: Upper-left coordinate of the string
+//  *string: The string
+void DWIN_Draw_String(bool widthAdjust, bool bShow, uint8_t size,
+                      uint16_t color, uint16_t bColor, uint16_t x, uint16_t y, char *string) {
+  size_t i = 0;
+  DWIN_Byte(i, 0x11);
+  // Bit 7: widthAdjust
+  // Bit 6: bShow
+  // Bit 5-4: Unused (0)
+  // Bit 3-0: size
+  DWIN_Byte(i, (widthAdjust * 0x80) | (bShow * 0x40) | size);
+  DWIN_Word(i, color);
+  DWIN_Word(i, bColor);
+  DWIN_Word(i, x);
+  DWIN_Word(i, y);
+  DWIN_String(i, string);
+  DWIN_Send(i);
+}
+
+// Draw a positive integer
+//  bShow: true=display background color; false=don't display background color
+//  zeroFill: true=zero fill; false=no zero fill
+//  zeroMode: 1=leading 0 displayed as 0; 0=leading 0 displayed as a space
+//  size: Font size
+//  color: Character color
+//  bColor: Background color
+//  iNum: Number of digits
+//  x/y: Upper-left coordinate
+//  value: Integer value
+void DWIN_Draw_IntValue(uint8_t bShow, bool zeroFill, uint8_t zeroMode, uint8_t size, uint16_t color,
+                          uint16_t bColor, uint8_t iNum, uint16_t x, uint16_t y, uint16_t value) {
+  size_t i = 0;
+  DWIN_Byte(i, 0x14);
+  // Bit 7: bshow
+  // Bit 6: 1 = signed; 0 = unsigned number;
+  // Bit 5: zeroFill
+  // Bit 4: zeroMode
+  // Bit 3-0: size
+  DWIN_Byte(i, (bShow * 0x80) | (zeroFill * 0x20) | (zeroMode * 0x10) | size);
+  DWIN_Word(i, color);
+  DWIN_Word(i, bColor);
+  DWIN_Byte(i, iNum);
+  DWIN_Byte(i, 0); // fNum
+  DWIN_Word(i, x);
+  DWIN_Word(i, y);
+  #if 0
+    for (char count = 0; count < 8; count++) {
+      DWIN_Byte(i, value);
+      value >>= 8;
+      if (!(value & 0xFF)) break;
+    }
+  #else
+    // Write a big-endian 64 bit integer
+    const size_t p = i + 1;
+    for (char count = 8; count--;) { // 7..0
+      ++i;
+      DWIN_SendBuf[p + count] = value;
+      value >>= 8;
+    }
+  #endif
+
+  DWIN_Send(i);
+}
+
+// Draw a floating point number
+//  bShow: true=display background color; false=don't display background color
+//  zeroFill: true=zero fill; false=no zero fill
+//  zeroMode: 1=leading 0 displayed as 0; 0=leading 0 displayed as a space
+//  size: Font size
+//  color: Character color
+//  bColor: Background color
+//  iNum: Number of whole digits
+//  fNum: Number of decimal digits
+//  x/y: Upper-left point
+//  value: Float value
+void DWIN_Draw_FloatValue(uint8_t bShow, bool zeroFill, uint8_t zeroMode, uint8_t size, uint16_t color,
+                            uint16_t bColor, uint8_t iNum, uint8_t fNum, uint16_t x, uint16_t y, long value) {
+  //uint8_t *fvalue = (uint8_t*)&value;
+  size_t i = 0;
+  DWIN_Byte(i, 0x14);
+  DWIN_Byte(i, (bShow * 0x80) | (zeroFill * 0x20) | (zeroMode * 0x10) | size);
+  DWIN_Word(i, color);
+  DWIN_Word(i, bColor);
+  DWIN_Byte(i, iNum);
+  DWIN_Byte(i, fNum);
+  DWIN_Word(i, x);
+  DWIN_Word(i, y);
+  DWIN_Long(i, value);
+  /*
+  DWIN_Byte(i, fvalue[3]);
+  DWIN_Byte(i, fvalue[2]);
+  DWIN_Byte(i, fvalue[1]);
+  DWIN_Byte(i, fvalue[0]);
+  */
+  DWIN_Send(i);
+}
+
+/*---------------------------------------- Picture related functions ----------------------------------------*/
+
+// Draw JPG and cached in #0 virtual display area
+// id: Picture ID
+void DWIN_JPG_ShowAndCache(const uint8_t id) {
+  size_t i = 0;
+  DWIN_Word(i, 0x2200);
+  DWIN_Byte(i, id);
+  DWIN_Send(i);     // AA 23 00 00 00 00 08 00 01 02 03 CC 33 C3 3C
+}
+
+// Draw an Icon
+//  libID: Icon library ID
+//  picID: Icon ID
+//  x/y: Upper-left point
+void DWIN_ICON_Show(uint8_t libID, uint8_t picID, uint16_t x, uint16_t y) {
+  NOMORE(x, DWIN_WIDTH - 1);
+  NOMORE(y, DWIN_HEIGHT - 1); // -- ozy -- srl
+  size_t i = 0;
+  DWIN_Byte(i, 0x23);
+  DWIN_Word(i, x);
+  DWIN_Word(i, y);
+  DWIN_Byte(i, 0x80 | libID);
+  DWIN_Byte(i, picID);
+  DWIN_Send(i);
+}
+
+// Unzip the JPG picture to a virtual display area
+//  n: Cache index
+//  id: Picture ID
+void DWIN_JPG_CacheToN(uint8_t n, uint8_t id) {
+  size_t i = 0;
+  DWIN_Byte(i, 0x25);
+  DWIN_Byte(i, n);
+  DWIN_Byte(i, id);
+  DWIN_Send(i);
+}
+
+// Copy area from virtual display area to current screen
+//  cacheID: virtual area number
+//  xStart/yStart: Upper-left of virtual area
+//  xEnd/yEnd: Lower-right of virtual area
+//  x/y: Screen paste point
+void DWIN_Frame_AreaCopy(uint8_t cacheID, uint16_t xStart, uint16_t yStart,
+                         uint16_t xEnd, uint16_t yEnd, uint16_t x, uint16_t y) {
+  size_t i = 0;
+  DWIN_Byte(i, 0x27);
+  DWIN_Byte(i, 0x80 | cacheID);
+  DWIN_Word(i, xStart);
+  DWIN_Word(i, yStart);
+  DWIN_Word(i, xEnd);
+  DWIN_Word(i, yEnd);
+  DWIN_Word(i, x);
+  DWIN_Word(i, y);
+  DWIN_Send(i);
+}
+
+// Animate a series of icons
+//  animID: Animation ID; 0x00-0x0F
+//  animate: true on; false off;
+//  libID: Icon library ID
+//  picIDs: Icon starting ID
+//  picIDe: Icon ending ID
+//  x/y: Upper-left point
+//  interval: Display time interval, unit 10mS
+void DWIN_ICON_Animation(uint8_t animID, bool animate, uint8_t libID, uint8_t picIDs, uint8_t picIDe, uint16_t x, uint16_t y, uint16_t interval) {
+  NOMORE(x, DWIN_WIDTH - 1);
+  NOMORE(y, DWIN_HEIGHT - 1); // -- ozy -- srl
+  size_t i = 0;
+  DWIN_Byte(i, 0x28);
+  DWIN_Word(i, x);
+  DWIN_Word(i, y);
+  // Bit 7: animation on or off
+  // Bit 6: start from begin or end
+  // Bit 5-4: unused (0)
+  // Bit 3-0: animID
+  DWIN_Byte(i, (animate * 0x80) | 0x40 | animID);
+  DWIN_Byte(i, libID);
+  DWIN_Byte(i, picIDs);
+  DWIN_Byte(i, picIDe);
+  DWIN_Byte(i, interval);
+  DWIN_Send(i);
+}
+
+// Animation Control
+//  state: 16 bits, each bit is the state of an animation id
+void DWIN_ICON_AnimationControl(uint16_t state) {
+  size_t i = 0;
+  DWIN_Byte(i, 0x28);
+  DWIN_Word(i, state);
+  DWIN_Send(i);
+}
+
+/*---------------------------------------- Memory functions ----------------------------------------*/
+// The LCD has an additional 32KB SRAM and 16KB Flash
+
+// Data can be written to the sram and save to one of the jpeg page files
+
+// Write Data Memory
+//  command 0x31
+//  Type: Write memory selection; 0x5A=SRAM; 0xA5=Flash
+//  Address: Write data memory address; 0x000-0x7FFF for SRAM; 0x000-0x3FFF for Flash
+//  Data: data
+//
+//  Flash writing returns 0xA5 0x4F 0x4B
+
+// Read Data Memory
+//  command 0x32
+//  Type: Read memory selection; 0x5A=SRAM; 0xA5=Flash
+//  Address: Read data memory address; 0x000-0x7FFF for SRAM; 0x000-0x3FFF for Flash
+//  Length: leangth of data to read; 0x01-0xF0
+//
+//  Response:
+//    Type, Address, Length, Data
+
+// Write Picture Memory
+//  Write the contents of the 32KB SRAM data memory into the designated image memory space
+//  Issued: 0x5A, 0xA5, PIC_ID
+//  Response: 0xA5 0x4F 0x4B
+//
+//  command 0x33
+//  0x5A, 0xA5
+//  PicId: Picture Memory location, 0x00-0x0F
+//
+//  Flash writing returns 0xA5 0x4F 0x4B
+
+#endif // DWIN_CREALITY_LCD