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diff --git a/Marlin/src/lcd/buttons.h b/Marlin/src/lcd/buttons.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
+
+#include "../inc/MarlinConfig.h"
+
+#if ((!HAS_ADC_BUTTONS && IS_NEWPANEL) || BUTTONS_EXIST(EN1, EN2)) && !IS_TFTGLCD_PANEL
+  #define HAS_ENCODER_WHEEL 1
+#endif
+#if HAS_ENCODER_WHEEL || ANY_BUTTON(ENC, BACK, UP, DWN, LFT, RT)
+  #define HAS_DIGITAL_BUTTONS 1
+#endif
+#if !HAS_ADC_BUTTONS && (IS_RRW_KEYPAD || (HAS_WIRED_LCD && !IS_NEWPANEL))
+  #define HAS_SHIFT_ENCODER 1
+#endif
+
+// I2C buttons must be read in the main thread
+#if ANY(LCD_I2C_VIKI, LCD_I2C_PANELOLU2, IS_TFTGLCD_PANEL)
+  #define HAS_SLOW_BUTTONS 1
+#endif
+
+#if HAS_ENCODER_WHEEL
+  #define ENCODER_PHASE_0 0
+  #define ENCODER_PHASE_1 2
+  #define ENCODER_PHASE_2 3
+  #define ENCODER_PHASE_3 1
+#endif
+
+#if EITHER(HAS_DIGITAL_BUTTONS, DWIN_CREALITY_LCD)
+
+  // Wheel spin pins where BA is 00, 10, 11, 01 (1 bit always changes)
+  #define BLEN_A 0
+  #define BLEN_B 1
+
+  #define EN_A _BV(BLEN_A)
+  #define EN_B _BV(BLEN_B)
+
+  #define _BUTTON_PRESSED(BN) !READ(BTN_##BN)
+
+  #if BUTTON_EXISTS(ENC) || HAS_TOUCH_BUTTONS
+    #define BLEN_C 2
+    #define EN_C _BV(BLEN_C)
+  #endif
+
+  #if ENABLED(LCD_I2C_VIKI)
+
+    #include <LiquidTWI2.h>
+
+    #define B_I2C_BTN_OFFSET 3 // (the first three bit positions reserved for EN_A, EN_B, EN_C)
+
+    // button and encoder bit positions within 'buttons'
+    #define B_LE (BUTTON_LEFT   << B_I2C_BTN_OFFSET)      // The remaining normalized buttons are all read via I2C
+    #define B_UP (BUTTON_UP     << B_I2C_BTN_OFFSET)
+    #define B_MI (BUTTON_SELECT << B_I2C_BTN_OFFSET)
+    #define B_DW (BUTTON_DOWN   << B_I2C_BTN_OFFSET)
+    #define B_RI (BUTTON_RIGHT  << B_I2C_BTN_OFFSET)
+
+    #if BUTTON_EXISTS(ENC)                                // The pause/stop/restart button is connected to BTN_ENC when used
+      #define B_ST (EN_C)                                 // Map the pause/stop/resume button into its normalized functional name
+      #define BUTTON_CLICK() (buttons & (B_MI|B_RI|B_ST)) // Pause/stop also acts as click until a proper pause/stop is implemented.
+    #else
+      #define BUTTON_CLICK() (buttons & (B_MI|B_RI))
+    #endif
+
+    // I2C buttons take too long to read inside an interrupt context and so we read them during lcd_update
+
+  #elif ENABLED(LCD_I2C_PANELOLU2)
+
+    #if !BUTTON_EXISTS(ENC) // Use I2C if not directly connected to a pin
+
+      #define B_I2C_BTN_OFFSET 3 // (the first three bit positions reserved for EN_A, EN_B, EN_C)
+
+      #define B_MI (PANELOLU2_ENCODER_C << B_I2C_BTN_OFFSET) // requires LiquidTWI2 library v1.2.3 or later
+
+      #define BUTTON_CLICK() (buttons & B_MI)
+
+    #endif
+
+  #endif
+
+#else
+
+  #undef BUTTON_EXISTS
+  #define BUTTON_EXISTS(...) false
+
+  // Dummy button, never pressed
+  #define _BUTTON_PRESSED(BN) false
+
+  // Shift register bits correspond to buttons:
+  #define BL_LE 7   // Left
+  #define BL_UP 6   // Up
+  #define BL_MI 5   // Middle
+  #define BL_DW 4   // Down
+  #define BL_RI 3   // Right
+  #define BL_ST 2   // Red Button
+  #define B_LE _BV(BL_LE)
+  #define B_UP _BV(BL_UP)
+  #define B_MI _BV(BL_MI)
+  #define B_DW _BV(BL_DW)
+  #define B_RI _BV(BL_RI)
+  #define B_ST _BV(BL_ST)
+
+  #ifndef BUTTON_CLICK
+    #define BUTTON_CLICK() (buttons & (B_MI|B_ST))
+  #endif
+
+#endif
+
+#if IS_RRW_KEYPAD
+  #define BTN_OFFSET          0 // Bit offset into buttons for shift register values
+
+  #define BLEN_KEYPAD_F3      0
+  #define BLEN_KEYPAD_F2      1
+  #define BLEN_KEYPAD_F1      2
+  #define BLEN_KEYPAD_DOWN    3
+  #define BLEN_KEYPAD_RIGHT   4
+  #define BLEN_KEYPAD_MIDDLE  5
+  #define BLEN_KEYPAD_UP      6
+  #define BLEN_KEYPAD_LEFT    7
+
+  #define EN_KEYPAD_F1      _BV(BTN_OFFSET + BLEN_KEYPAD_F1)
+  #define EN_KEYPAD_F2      _BV(BTN_OFFSET + BLEN_KEYPAD_F2)
+  #define EN_KEYPAD_F3      _BV(BTN_OFFSET + BLEN_KEYPAD_F3)
+  #define EN_KEYPAD_DOWN    _BV(BTN_OFFSET + BLEN_KEYPAD_DOWN)
+  #define EN_KEYPAD_RIGHT   _BV(BTN_OFFSET + BLEN_KEYPAD_RIGHT)
+  #define EN_KEYPAD_MIDDLE  _BV(BTN_OFFSET + BLEN_KEYPAD_MIDDLE)
+  #define EN_KEYPAD_UP      _BV(BTN_OFFSET + BLEN_KEYPAD_UP)
+  #define EN_KEYPAD_LEFT    _BV(BTN_OFFSET + BLEN_KEYPAD_LEFT)
+
+  #define RRK(B) (keypad_buttons & (B))
+
+  #ifdef EN_C
+    #define BUTTON_CLICK() ((buttons & EN_C) || RRK(EN_KEYPAD_MIDDLE))
+  #else
+    #define BUTTON_CLICK() RRK(EN_KEYPAD_MIDDLE)
+  #endif
+#endif
+
+#ifndef EN_A
+  #define EN_A 0
+#endif
+#ifndef EN_B
+  #define EN_B 0
+#endif
+#ifndef EN_C
+  #define EN_C 0
+#endif
+#if BUTTON_EXISTS(BACK) || EITHER(HAS_TOUCH_BUTTONS, IS_TFTGLCD_PANEL)
+  #define BLEN_D 3
+  #define EN_D _BV(BLEN_D)
+#else
+  #define EN_D 0
+#endif
+
+#define BUTTON_PRESSED(BN) (_BUTTON_PRESSED_##BN)
+
+#if BUTTON_EXISTS(EN1)
+  #define _BUTTON_PRESSED_EN1 _BUTTON_PRESSED(EN1)
+#else
+  #define _BUTTON_PRESSED_EN1 false
+#endif
+#if BUTTON_EXISTS(EN2)
+  #define _BUTTON_PRESSED_EN2 _BUTTON_PRESSED(EN2)
+#else
+  #define _BUTTON_PRESSED_EN2 false
+#endif
+#if BUTTON_EXISTS(ENC_EN)
+  #define _BUTTON_PRESSED_ENC_EN _BUTTON_PRESSED(ENC_EN)
+#else
+  #define _BUTTON_PRESSED_ENC_EN false
+#endif
+#if BUTTON_EXISTS(ENC)
+  #define _BUTTON_PRESSED_ENC _BUTTON_PRESSED(ENC)
+#else
+  #define _BUTTON_PRESSED_ENC false
+#endif
+#if BUTTON_EXISTS(UP)
+  #define _BUTTON_PRESSED_UP _BUTTON_PRESSED(UP)
+#else
+  #define _BUTTON_PRESSED_UP false
+#endif
+#if BUTTON_EXISTS(DWN)
+  #define _BUTTON_PRESSED_DWN _BUTTON_PRESSED(DWN)
+#else
+  #define _BUTTON_PRESSED_DWN false
+#endif
+#if BUTTON_EXISTS(LFT)
+  #define _BUTTON_PRESSED_LFT _BUTTON_PRESSED(LFT)
+#else
+  #define _BUTTON_PRESSED_LFT false
+#endif
+#if BUTTON_EXISTS(RT)
+  #define _BUTTON_PRESSED_RT _BUTTON_PRESSED(RT)
+#else
+  #define _BUTTON_PRESSED_RT false
+#endif
+#if BUTTON_EXISTS(BACK)
+  #define _BUTTON_PRESSED_BACK _BUTTON_PRESSED(BACK)
+#else
+  #define _BUTTON_PRESSED_BACK false
+#endif
+
+#ifndef BUTTON_CLICK
+  #if EN_C > 0
+    #define BUTTON_CLICK() (buttons & EN_C)
+  #else
+    #define BUTTON_CLICK() false
+  #endif
+#endif
+
+#if EN_D > 0
+  #define LCD_BACK_CLICKED() (buttons & EN_D)
+#else
+  #define LCD_BACK_CLICKED() false
+#endif