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+/**
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+ * Marlin 3D Printer Firmware
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+ * Copyright (c) 2023 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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+ *
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+ * Based on Sprinter and grbl.
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+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
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+ *
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+ * This program is free software: you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation, either version 3 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
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+ *
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+ */
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+#pragma once
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+
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+/**
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+ * Sovol 1.3.1 (GD32F103RET6) board pin assignments
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+ */
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+
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+#include "env_validate.h"
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+
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+#if HOTENDS > 1 || E_STEPPERS > 1
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+ #error "SOVOL V131 only supports 1 hotend / E-stepper."
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+#endif
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+
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+#ifndef BOARD_INFO_NAME
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+ #define BOARD_INFO_NAME "Sovol V131"
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+#endif
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+#ifndef DEFAULT_MACHINE_NAME
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+ #define DEFAULT_MACHINE_NAME "Sovol SV06"
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+#endif
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+
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+//#define BOARD_NO_NATIVE_USB
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+
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+//
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+// Release PB4 (Y_ENABLE_PIN) from JTAG NRST role
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+//
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+#ifndef DISABLE_DEBUG
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+ #define DISABLE_DEBUG
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+#endif
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+
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+//
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+// EEPROM
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+//
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+#if NO_EEPROM_SELECTED
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+ #define IIC_BL24CXX_EEPROM // EEPROM on I2C-0
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+ //#define SDCARD_EEPROM_EMULATION
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+ #undef NO_EEPROM_SELECTED
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+#endif
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+
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+#if ENABLED(IIC_BL24CXX_EEPROM)
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+ #define IIC_EEPROM_SDA PA11
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+ #define IIC_EEPROM_SCL PA12
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+ #define MARLIN_EEPROM_SIZE 0x800 // 2K (24C16)
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+#elif ENABLED(SDCARD_EEPROM_EMULATION)
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+ #define MARLIN_EEPROM_SIZE 0x800 // 2K
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+#endif
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+
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+//
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+// Servos
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+//
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+#ifndef SERVO0_PIN
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+ #ifndef HAS_PIN_27_BOARD
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+ #define SERVO0_PIN PB0 // BLTouch OUT
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+ #else
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+ #define SERVO0_PIN PC6
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+ #endif
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+#endif
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+
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+//
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+// Limit Switches
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+//
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+#ifndef X_STOP_PIN
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+ #define X_STOP_PIN PA5
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+#endif
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+#ifndef Y_STOP_PIN
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+ #define Y_STOP_PIN PA6
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+#endif
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+#ifndef Z_STOP_PIN
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+ #define Z_STOP_PIN PA7
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+#endif
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+
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+#ifndef Z_MIN_PROBE_PIN
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+ #define Z_MIN_PROBE_PIN PB1 // BLTouch IN
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+#endif
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+
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+//
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+// Filament Runout Sensor
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+//
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+#ifndef FIL_RUNOUT_PIN
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+ #define FIL_RUNOUT_PIN PA4 // "Pulled-high"
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+#endif
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+
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+//
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+// Steppers
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+//
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+#ifndef X_STEP_PIN
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+ #define X_STEP_PIN PC2
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+#endif
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+#ifndef X_DIR_PIN
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+ #define X_DIR_PIN PB9
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+#endif
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+#define X_ENABLE_PIN PC3 // Shared
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+
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+#ifndef Y_STEP_PIN
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+ #define Y_STEP_PIN PB8
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+#endif
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+#ifndef Y_DIR_PIN
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+ #define Y_DIR_PIN PB7
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+#endif
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+#define Y_ENABLE_PIN X_ENABLE_PIN
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+
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+#ifndef Z_STEP_PIN
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+ #define Z_STEP_PIN PB6
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+#endif
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+#ifndef Z_DIR_PIN
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+ #define Z_DIR_PIN PB5
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+#endif
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+#define Z_ENABLE_PIN X_ENABLE_PIN
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+
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+#ifndef E0_STEP_PIN
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+ #define E0_STEP_PIN PB4
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+#endif
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+#ifndef E0_DIR_PIN
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+ #define E0_DIR_PIN PB3
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+#endif
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+#define E0_ENABLE_PIN X_ENABLE_PIN
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+
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+#if HAS_TMC_UART
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+
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+ /**
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+ * TMC2208/TMC2209 stepper drivers
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+ *
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+ * Hardware serial communication ports.
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+ * If undefined software serial is used according to the pins below
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+ */
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+
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+ #define X_SERIAL_TX_PIN PC1
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+ #define X_SERIAL_RX_PIN PC1
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+
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+ #define Y_SERIAL_TX_PIN PC0
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+ #define Y_SERIAL_RX_PIN PC0
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+
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+ #define Z_SERIAL_TX_PIN PA15
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+ #define Z_SERIAL_RX_PIN PA15
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+
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+ #define E0_SERIAL_TX_PIN PC14
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+ #define E0_SERIAL_RX_PIN PC14
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+
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+ // Reduce baud rate to improve software serial reliability
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+ #define TMC_BAUD_RATE 19200
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+
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+#endif // HAS_TMC_UART
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+
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+//
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+// Temperature Sensors
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+//
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+#define TEMP_0_PIN PC5 // TH1
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+#define TEMP_BED_PIN PC4 // TB1
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+
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+//
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+// Heaters / Fans
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+//
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+#ifndef HEATER_0_PIN
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+ #define HEATER_0_PIN PA1 // HEATER1
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+#endif
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+#ifndef HEATER_BED_PIN
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+ #define HEATER_BED_PIN PA2 // HOT BED
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+#endif
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+#ifndef FAN_PIN
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+ #define FAN_PIN PA0 // FAN
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+#endif
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+#define FAN_SOFT_PWM_REQUIRED
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+
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+//
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+// SD Card
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+//
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+#define SD_DETECT_PIN PC7
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+#define SDCARD_CONNECTION ONBOARD
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+#define ONBOARD_SPI_DEVICE 1
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+#define ONBOARD_SD_CS_PIN PA4 // SDSS
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+#define SDIO_SUPPORT
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+#define NO_SD_HOST_DRIVE // This board's SD is only seen by the printer
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+
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+#if ANY(RET6_12864_LCD, HAS_DWIN_E3V2, IS_DWIN_MARLINUI)
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+ /**
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+ * RET6 12864 LCD
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+ * ------
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+ * PC6 | 1 2 | PB2
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+ * PB10 | 3 4 | PB11
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+ * PB14 5 6 | PB13
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+ * PB12 | 7 8 | PB15
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+ * GND | 9 10 | 5V
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+ * ------
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+ */
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+ #define EXP3_01_PIN PC6
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+ #define EXP3_02_PIN PB2
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+ #define EXP3_03_PIN PB10
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+ #define EXP3_04_PIN PB11
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+ #define EXP3_05_PIN PB14
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+ #define EXP3_06_PIN PB13
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+ #define EXP3_07_PIN PB12
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+ #define EXP3_08_PIN PB15
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+#endif
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+
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+#if ENABLED(CR10_STOCKDISPLAY)
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+
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+ #if ENABLED(RET6_12864_LCD)
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+
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+ #define LCD_PINS_RS EXP3_07_PIN
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+ #define LCD_PINS_ENABLE EXP3_08_PIN
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+ #define LCD_PINS_D4 EXP3_06_PIN
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+
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+ #define BTN_ENC EXP3_02_PIN
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+ #define BTN_EN1 EXP3_03_PIN
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+ #define BTN_EN2 EXP3_05_PIN
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+
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+ #ifndef HAS_PIN_27_BOARD
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+ #define BEEPER_PIN EXP3_01_PIN
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+ #endif
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+
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+ #else
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+
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+ #error "Only the RET6_12864_LCD variant of CR10_STOCKDISPLAY is supported."
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+
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+ #endif
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+
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+#endif
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Michael Hill