/**
 * 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

/**
 * Melzi (Creality) pin assignments
 *
 * The Creality board needs a bootloader installed before Marlin can be uploaded.
 * If you don't have a chip programmer you can use a spare Arduino plus a few
 * electronic components to write the bootloader.
 *
 * See https://www.instructables.com/id/Burn-Arduino-Bootloader-with-Arduino-MEGA/
 *
 * Schematic: https://bit.ly/2XOnsWb
 */

#define BOARD_INFO_NAME "Melzi (Creality)"

// Alter timing for graphical display
#if HAS_MARLINUI_U8GLIB
  #ifndef BOARD_ST7920_DELAY_1
    #define BOARD_ST7920_DELAY_1 DELAY_NS(125)
  #endif
  #ifndef BOARD_ST7920_DELAY_2
    #define BOARD_ST7920_DELAY_2 DELAY_NS(125)
  #endif
  #ifndef BOARD_ST7920_DELAY_3
    #define BOARD_ST7920_DELAY_3 DELAY_NS(125)
  #endif
#endif

#include "pins_MELZI.h"

//
// For the stock CR-10 enable CR10_STOCKDISPLAY in Configuration.h
//
#undef LCD_SDSS
#undef LED_PIN
#undef LCD_PINS_RS
#undef LCD_PINS_ENABLE
#undef LCD_PINS_D4
#undef LCD_PINS_D5
#undef LCD_PINS_D6
#undef LCD_PINS_D7

#define LCD_SDSS                              31  // Smart Controller SD card reader (rather than the Melzi)
#define LCD_PINS_RS                           28  // ST9720 CS
#define LCD_PINS_ENABLE                       17  // ST9720 DAT
#define LCD_PINS_D4                           30  // ST9720 CLK

#if ENABLED(BLTOUCH)
  #define SERVO0_PIN                          27
  #undef BEEPER_PIN
#elif ENABLED(FILAMENT_RUNOUT_SENSOR)
  #ifndef FIL_RUNOUT_PIN
    #define FIL_RUNOUT_PIN                    27
  #endif
  #if FIL_RUNOUT_PIN == BEEPER_PIN
    #undef BEEPER_PIN
  #endif
#endif

#if ENABLED(MINIPANEL)
  #undef DOGLCD_CS
  #define DOGLCD_CS                  LCD_PINS_RS
#endif

/**
  PIN:   0   Port: B0        E0_DIR_PIN                  protected
  PIN:   1   Port: B1        E0_STEP_PIN                 protected
  PIN:   2   Port: B2        Z_DIR_PIN                   protected
  PIN:   3   Port: B3        Z_STEP_PIN                  protected
  PIN:   4   Port: B4        AVR_SS_PIN                  protected
  .                          FAN_PIN                     protected
  .                       SD_SS_PIN                      protected
  PIN:   5   Port: B5        AVR_MOSI_PIN                Output = 1
  .                       SD_MOSI_PIN                    Output = 1
  PIN:   6   Port: B6        AVR_MISO_PIN                Input  = 0    TIMER3A   PWM:     0    WGM: 1    COM3A: 0    CS: 3    TCCR3A: 1    TCCR3B: 3    TIMSK3: 0
  .                       SD_MISO_PIN                    Input  = 0
  PIN:   7   Port: B7        AVR_SCK_PIN                 Output = 0    TIMER3B   PWM:     0    WGM: 1    COM3B: 0    CS: 3    TCCR3A: 1    TCCR3B: 3    TIMSK3: 0
  .                       SD_SCK_PIN                     Output = 0
  PIN:   8   Port: D0        RXD                         Input  = 1
  PIN:   9   Port: D1        TXD                         Input  = 0
  PIN:  10   Port: D2        BTN_EN2                     Input  = 1
  PIN:  11   Port: D3        BTN_EN1                     Input  = 1
  PIN:  12   Port: D4        HEATER_BED_PIN              protected
  PIN:  13   Port: D5        HEATER_0_PIN                protected
  PIN:  14   Port: D6        E0_ENABLE_PIN               protected
  .                          X_ENABLE_PIN                protected
  .                          Y_ENABLE_PIN                protected
  PIN:  15   Port: D7        X_STEP_PIN                  protected
  PIN:  16   Port: C0        BTN_ENC                     Input  = 1
  .                          SCL                         Input  = 1
  PIN:  17   Port: C1        LCD_PINS_ENABLE             Output = 0
  .                          SDA                         Output = 0
  PIN:  18   Port: C2        X_MIN_PIN                   protected
  .                          X_STOP_PIN                  protected
  PIN:  19   Port: C3        Y_MIN_PIN                   protected
  .                          Y_STOP_PIN                  protected
  PIN:  20   Port: C4        Z_MIN_PIN                   protected
  .                          Z_STOP_PIN                  protected
  PIN:  21   Port: C5        X_DIR_PIN                   protected
  PIN:  22   Port: C6        Y_STEP_PIN                  protected
  PIN:  23   Port: C7        Y_DIR_PIN                   protected
  PIN:  24   Port: A7        TEMP_0_PIN                  protected
  PIN:  25   Port: A6        TEMP_BED_PIN                protected
  PIN:  26   Port: A5        Z_ENABLE_PIN                protected
  PIN:  27   Port: A4        BEEPER_PIN                  Output = 0
  PIN:  28   Port: A3        LCD_PINS_RS                 Output = 0
  PIN:  29   Port: A2        <unused/unknown>            Input  = 0
  PIN:  30   Port: A1        LCD_PINS_D4                 Output = 1
  PIN:  31   Port: A0        SDSS                        Output = 1
*/

/**
 *    EXP1 Connector                      EXP1 as CR10 STOCKDISPLAY
 *        _____                                      _____
 *   PA4 | 6 5 | PC0                     BEEPER_PIN | 6 5 | BTN_ENC
 *   PD3 | 7 4 | RESET                      BTN_EN1 | 7 4 | RESET
 *   PD2   8 3 | PA1                        BTN_EN2   8 3 | LCD_PINS_D4 (ST9720 CLK)
 *   PA3 | 9 2 | PC1        (ST9720 CS) LCD_PINS_RS | 9 2 | LCD_PINS_ENABLE (ST9720 DAT)
 *   GND |10 1 | 5V                             GND |10 1 | 5V
 *        -----                                   -----
 */