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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
+
+/**
+ * Arduino DUE Shield Kit (ADSK) pin assignments
+ */
+
+#define BOARD_INFO_NAME "ADSK"
+
+#if NOT_TARGET(__SAM3X8E__, __AVR_ATmega1280__, __AVR_ATmega2560__)
+  #error "Oops! Select 'Arduino Due or Mega' in 'Tools > Board.'"
+#endif
+
+/* CNC shield modifications:
+FROM THE BOTTOM CUT THE 5V PIN THAT GOES TO ARDUINO!!!
+On the top put jumper between 5V and 3V3 pins,
+    jumper between D12 and A.STEP, jumper between D13 and A.DIR
+*/
+
+/* CNC shield 3D printer connections:
+X,Y,Z steppers as normal
+A stepper for E0 extruder
+(X-)&(GND) - X limit
+(Y-)&(GND) - Y limit
+(Z-)&(GND) - Z limit
+(Abort)&(GND) - Extruder thermistor (also require pullup resistor 4.7K between "Abort" and
+                                      Vcc (now "5V" on the board but actual 3.3V because of jumper))
+(Hold)&(GND) - Bed thermistor (also require pullup resistor 4.7K between "Hold" and
+                                 Vcc (now "5V" on the board but actual 3.3V because of jumper))
+(CoolEn) - 3.3v signal to controll extruder heater MOSFET
+(Resume) - 3.3v signal to control heatbed MOSFET
+(SDA) - 3.3v signal to controll extruder fan
+(SCL) - 3.3v signal to controll extruder cooling fan
+*/
+
+/* CNC Shield pinout
+"Name on the board": DUE pin
+"Abort":    Analog pin 0 or Digital pin 54
+"Hold":     Analog pin 1 or Digital pin 55
+"Resume":   Analog pin 2 or Digital pin 56
+"CoolEn":   Analog pin 3 or Digital pin 57
+"SDA":      Analog pin 4 or Digital pin 58
+"SCL":      Analog pin 5 or Digital pin 59
+"E-STOP":   Reset pin
+"RX":       Digital pin 0
+"TX":       Digital pin 1
+"X.STEP":   Digital pin 2
+"Y.STEP":   Digital pin 3
+"Z.STEP":   Digital pin 4
+"X.DIR":    Digital pin 5
+"Y.DIR":    Digital pin 6
+"Z.DIR":    Digital pin 7
+"EN":       Digital pin 8
+"X+","X-":  Digital pin 9
+"Y+","Y-":  Digital pin 10
+"Z+","Z-":  Digital pin 11
+"SpinEn":   Digital pin 12 -> will be connected to A.STEP with jumper
+"SpinDir":  Digital pin 13 -> will be connected to A.DIR with jumper
+*/
+
+//
+// Servos
+//
+#define SERVO0_PIN                            61  // Analog pin 7, Digital pin 61
+
+//
+// Limit Switches
+//
+#define X_MIN_PIN                              9
+#define Y_MIN_PIN                             10
+#define Z_MIN_PIN                             11
+
+#define Z_MIN_PROBE_PIN                       62  // Analog pin 8, Digital pin 62
+
+//
+// Steppers
+//
+#define X_STEP_PIN                             2
+#define X_DIR_PIN                              5
+#define X_ENABLE_PIN                           8
+
+#define Y_STEP_PIN                             3
+#define Y_DIR_PIN                              6
+#define Y_ENABLE_PIN                           8
+
+#define Z_STEP_PIN                             4
+#define Z_DIR_PIN                              7
+#define Z_ENABLE_PIN                           8
+
+#define E0_STEP_PIN                           12
+#define E0_DIR_PIN                            13
+#define E0_ENABLE_PIN                          8
+
+//
+// Heaters / Fans
+//
+#define HEATER_0_PIN                          55  // "Hold":   Analog pin 1, Digital pin 55
+#define HEATER_BED_PIN                        57  // "CoolEn": Analog pin 3, Digital pin 57
+#define FAN_PIN                               54  // "Abort":  Analog pin 0, Digital pin 54
+#undef E0_AUTO_FAN_PIN
+#define E0_AUTO_FAN_PIN                       56  // "Resume": Analog pin 2, Digital pin 56
+
+//
+// Temperature Sensors
+//
+#define TEMP_0_PIN                             4  // "SDA":    Analog pin 4, Digital pin 58
+#define TEMP_BED_PIN                           5  // "SCL":    Analog pin 5, Digital pin 59
+
+//
+// Misc. Functions
+//
+#define SDSS                                  52
+
+#if ENABLED(ZONESTAR_LCD)
+
+  /**
+   * The 2004 LCD should be powered with 5V.
+   * The next LCD pins RS,D4,D5,D6,D7 have internal pull-ups to 5V and as result the 5V will be on these pins.
+   * Luckily these internal pull-ups have really high resistance and adding 33K pull-down resistors will create
+   * simple voltage divider that will bring the voltage down just slightly bellow 3.3V.
+   *
+   * This LCD also has buttons that connected to the same ADC pin with different voltage divider combinations.
+   * On the LCD panel there is internal pull-up resistor of the 4.7K connected to 5V.
+   * Connecting another 4.7K pull-down resistor between ADC pin and the GND
+   *   will result in scaled values for voltage dividers and will bring them down to be always below 3.3V.
+   *
+   * For 2004 LCD to work with 3.3V board like Arduino DUE the next required:
+   * Pull-down resistors of 33K between each of LCD pins RS,D4,D5,D6,D7 and the GND.
+   * Pull-down resistor of 4.7K between ADC_KEYPAD_PIN and the GND
+   *
+   * All these modifications will still work with 5V based boards but require proper scaled ADC values
+   */
+
+  #ifdef __SAM3X8E__
+    #define AREF_VOLTS 3.3
+  #else
+    #define AREF_VOLTS 5.0
+  #endif
+
+  //
+  // LCD / Controller
+  //
+  #define LCD_PINS_ENABLE                     14
+  #define LCD_PINS_RS                         15
+  #define LCD_PINS_D4                         16
+  #define LCD_PINS_D5                         17
+  #define LCD_PINS_D6                         18
+  #define LCD_PINS_D7                         19
+  #define ADC_KEYPAD_PIN                       6  //60 // Analog pin 6, Digital pin 60
+
+  /**
+   * The below defines will scale all the values to work properly on both
+   * 5V (Mega) and 3.3V (DUE) boards with all pull-up resistors added for 3.3V
+   */
+
+  #define ADC_BUTTONS_VALUE_SCALE         (5.0/AREF_VOLTS) // The LCD module pullup voltage is 5.0V but ADC reference voltage is 3.3V
+
+  #define ADC_BUTTONS_R_PULLDOWN          4.7     // Moves voltage down to be bellow 3.3V instead of 5V
+  // the resistors values will be scaled because of 4.7K pulldown parallel resistor
+  #define _ADC_BUTTONS_R_SCALED(R)        ((R) * (ADC_BUTTONS_R_PULLDOWN) / ((R) + ADC_BUTTONS_R_PULLDOWN))
+
+  // buttons pullup resistor
+  #define ADC_BUTTONS_R_PULLUP            4.7     // the resistor on the 2004 LCD panel
+  // buttons resistors with scaled values because of parallel pulldown resistor
+  #define ADC_BUTTONS_LEFT_R_PULLDOWN     _ADC_BUTTONS_R_SCALED(0.47)
+  #define ADC_BUTTONS_RIGHT_R_PULLDOWN    _ADC_BUTTONS_R_SCALED(4.7)
+  #define ADC_BUTTONS_UP_R_PULLDOWN       _ADC_BUTTONS_R_SCALED(1.0)
+  #define ADC_BUTTONS_DOWN_R_PULLDOWN     _ADC_BUTTONS_R_SCALED(10.0)
+  #define ADC_BUTTONS_MIDDLE_R_PULLDOWN   _ADC_BUTTONS_R_SCALED(2.2)
+
+#endif // ZONESTAR_LCD
+
+/**
+ * RJ45 8 pins extruder connector
+ *
+ * 1 - GND (Please do not connect to the same GND as extruder heater to prevent ground offset voltage)
+ * 2 - thermistor
+ * 3 - SERVO PWM
+ * 4 - extruder heater
+ * 5 - FAN (print cooling)
+ * 6 - FAN (extruder cooling)
+ * 7 - Probe signal
+ * 8 - 5V
+ *
+ * Standard ethernet pairs: 1&2, 3&6, 4&5, 7&8
+ * Use CAT7 cable to have all pairs shielded
+ */