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diff --git a/Marlin/src/libs/BL24CXX.h b/Marlin/src/libs/BL24CXX.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     BL24CXX.h
+ * @brief    i2c EEPROM for Ender 3 v2 board (4.2.2)
+ ********************************************************************************/
+
+/******************** IIC ********************/
+
+class BL24CXX;
+
+// All operation functions of IIC
+class IIC {
+friend class BL24CXX;
+protected:
+  static void init();                // Initialize the IO port of IIC
+  static void start();               // Send IIC start signal
+  static void stop();                // Send IIC stop signal
+  static void send_byte(uint8_t txd); // IIC sends a byte
+  static uint8_t read_byte(unsigned char ack); // IIC reads a byte
+  static uint8_t wait_ack();         // IIC waits for ACK signal
+  static void ack();                 // IIC sends ACK signal
+  static void nAck();                // IIC does not send ACK signal
+};
+
+/******************** EEPROM ********************/
+
+#define BL24C01     127
+#define BL24C02     255
+#define BL24C04     511
+#define BL24C08    1023
+#define BL24C16    2047
+#define BL24C32    4095
+#define BL24C64    8191
+#define BL24C128  16383
+#define BL24C256  32767
+#define EE_TYPE BL24C16
+
+class BL24CXX {
+private:
+  static bool _check();                                                             // Check the device
+public:
+  static void init();                                                               // Initialize IIC
+  static bool check();                                                              // Check / recheck the device
+  static uint8_t readOneByte(uint16_t ReadAddr);                                    // Read a byte at the specified address
+  static void writeOneByte(uint16_t WriteAddr, uint8_t DataToWrite);                // Write a byte at the specified address
+  static void writeLenByte(uint16_t WriteAddr, uint32_t DataToWrite, uint8_t Len);  // The specified address begins to write the data of the specified length
+  static uint32_t readLenByte(uint16_t ReadAddr, uint8_t Len);                      // The specified address starts to read the data of the specified length
+  static void write(uint16_t WriteAddr, uint8_t *pBuffer, uint16_t NumToWrite);     // Write the specified length of data from the specified address
+  static void read(uint16_t ReadAddr, uint8_t *pBuffer, uint16_t NumToRead);        // Read the data of the specified length from the specified address
+};