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✨ Prusa Buddy
Completes #28439
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‎Marlin/src/core/boards.h‎

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#define BOARD_ZNP_ROBIN_NANO_V1_3 5260 // Elegoo Neptune 2 v1.3 board
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#define BOARD_MKS_NEPTUNE_X 5261 // Elegoo Neptune X
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#define BOARD_MKS_NEPTUNE_3 5262 // Elegoo Neptune 3
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#define BOARD_PRUSA_BUDDY 5263 // Prusa Buddy Board Mini (STM32F407VGT6)
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#define BOARD_PRUSA_BUDDY_XL 5264 // Prusa xBuddy Board (STM32F407VGT6)
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//
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// Other ARM Cortex-M4

‎Marlin/src/pins/pins.h‎

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#include "stm32f4/pins_MKS_NEPTUNE_X.h" // STM32F4 env:mks_neptune_x
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#elif MB(MKS_NEPTUNE_3)
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#include "stm32f4/pins_MKS_NEPTUNE_3.h" // STM32F4 env:mks_neptune_3
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#elif MB(PRUSA_BUDDY)
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#include "stm32f4/pins_PRUSA_BUDDY.h" // STM32F4 env:STM32F407VG_prusa_buddy env:STM32F407VG_prusa_buddy_USB
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#elif MB(PRUSA_BUDDY_XL)
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#include "stm32f4/pins_PRUSA_BUDDY_XL.h" // STM32F4 env:STM32F407VG_prusa_buddy env:STM32F407VG_prusa_buddy_USB
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//
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// Other ARM Cortex-M4

‎Marlin/src/pins/stm32f4/pins_PRUSA_BUDDY.h‎

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/**
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* Marlin 3D Printer Firmware
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* Copyright (c) 2026 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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/**
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* pins_PRUSA_BUDDY.h
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* Prusa Buddy Board Mini pin definitions
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*
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* Prusa Buddy Board Mini (Prusa Mini / Mini+)
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* MCU: STM32F407VGT6 (STM32F407VG, 100-pin LQFP)
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*
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* Schematic: https://github.com/prusa3d/Buddy-board-MINI-PCB
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*/
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#pragma once
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#define BOARD_INFO_NAME "Prusa Buddy"
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#define DEFAULT_MACHINE_NAME "Prusa Mini"
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#include "pins_PRUSA_BUDDY_common.h"

‎Marlin/src/pins/stm32f4/pins_PRUSA_BUDDY_XL.h‎

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/**
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* Marlin 3D Printer Firmware
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* Copyright (c) 2026 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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/**
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* pins_PRUSA_BUDDY_XL.h
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* Prusa xBuddy Board pin definitions
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*
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* Board: Prusa xBuddy Board
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* MCU: STM32F407VGT6 (STM32F407VG, 100-pin LQFP)
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*
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* The xBuddy shares the base pinout with the Buddy Mini.
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* This file includes the common definitions and adds xBuddy-specific overrides.
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*
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* Schematic: https://github.com/prusa3d/Buddy-board-MINI-PCB
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*/
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#pragma once
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#define BOARD_INFO_NAME "Prusa xBuddy"
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#define DEFAULT_MACHINE_NAME "Prusa xBuddy"
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// xBuddy uses the same base pinout as Buddy Mini
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#include "pins_PRUSA_BUDDY_common.h"
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//
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// xBuddy-specific overrides (if any) go below
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//
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// Note: If xBuddy has differences such as a different display connector,
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// additional stepper drivers, or different peripheral routing, define
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// them here to override the common definitions.

‎Marlin/src/pins/stm32f4/pins_PRUSA_BUDDY_common.h‎

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/**
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* Marlin 3D Printer Firmware
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* Copyright (c) 2026 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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/**
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* pins_PRUSA_BUDDY_common.h
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* Prusa Buddy Board common pin definitions
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*
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* This common file is shared by Buddy Mini and xBuddy board variants.
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*
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* MCU: STM32F407VGT6 (STM32F407VG, 100-pin LQFP)
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* Schematic: https://github.com/prusa3d/Buddy-board-MINI-PCB
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*/
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#pragma once
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#include "env_validate.h"
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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 FLASH_EEPROM_EMULATION
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#endif
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#if ENABLED(FLASH_EEPROM_EMULATION)
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#define FLASH_EEPROM_LEVELING
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#endif
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//
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// Servo pin
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//
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#define SERVO0_PIN PE14
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//
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// Trinamic Stallguard / Diag pins
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// (Using the UART-based TMC2209 on this board, so diag pins used for endstops)
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//
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#define X_STOP_PIN PG3
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#define Y_STOP_PIN PG4
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#define Z_STOP_PIN PG5
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//
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// Z Probe (when not Z_MIN_PIN)
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//
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#ifndef Z_MIN_PROBE_PIN
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#define Z_MIN_PROBE_PIN PG6
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#endif
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//
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// Filament Runout
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//
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#define FIL_RUNOUT_PIN PE5
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#define FIL_RUNOUT2_PIN PE6
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//
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// Steppers
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//
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#define X_STEP_PIN PG1
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#define X_DIR_PIN PB10
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#define X_ENABLE_PIN PG0
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#define Y_STEP_PIN PF14
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#define Y_DIR_PIN PF15
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#define Y_ENABLE_PIN PF13
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#define Z_STEP_PIN PF11
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#define Z_DIR_PIN PF12
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#define Z_ENABLE_PIN PC5
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#define E0_STEP_PIN PC14
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#define E0_DIR_PIN PC13
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#define E0_ENABLE_PIN PC15
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//
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// TMC2209 UART Stepper Drivers
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//
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#if HAS_TMC_UART
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#ifndef X_SERIAL_TX_PIN
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#define X_SERIAL_TX_PIN PB2
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#endif
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#ifndef Y_SERIAL_TX_PIN
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#define Y_SERIAL_TX_PIN PE2
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#endif
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#ifndef Z_SERIAL_TX_PIN
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#define Z_SERIAL_TX_PIN PE3
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#endif
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#ifndef E0_SERIAL_TX_PIN
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#define E0_SERIAL_TX_PIN PE4
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#endif
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// Reduce baud rate to improve software serial reliability
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#ifndef TMC_BAUD_RATE
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#define TMC_BAUD_RATE 19200
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#endif
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#endif
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//
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// UART connector (J7) - USART3 via alternate pins
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// PB10 is already used for X_DIR_PIN, so use alternate USART3 pins
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//
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#define BOARD_UART_TX_PIN PD8 // USART3_TX (alternate)
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#define BOARD_UART_RX_PIN PD9 // USART3_RX (alternate)
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//
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// Temperature Sensors
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//
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// TODO: Upstream Prusa firmware marks these as "Dummy, measured by puppy"
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// — indicating external measurement via a separate controller/daughter-board.
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// Verify whether local ADC reads are valid or if values come over I2C/CAN.
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//
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#define TEMP_0_PIN PC1 // Analog Input - THERM0 (Nozzle)
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#define TEMP_1_PIN PC2 // Analog Input - THERM1
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#define TEMP_BED_PIN PC0 // Analog Input - BED_THERM
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//
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// Heaters / Fans
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//
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// TODO: Upstream Prusa firmware marks HEATER_0 and HEATER_BED as
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// "Dummy, measured by puppy" — heater PWM may be driven externally.
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//
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#define HEATER_0_PIN PA1
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#define HEATER_BED_PIN PA2
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// TODO: Upstream Prusa firmware has "#undef E0_AUTO_FAN_PIN" with the note
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// "no auto fan pin - handled by dwarf". The "dwarf" appears to be a
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// daughter-board or CANbus peripheral that manages fan control.
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// Investigate dwarf interface before enabling AUTO_FAN here.
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//
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#ifndef FAN0_PIN
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#define FAN0_PIN PF7
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#endif
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#define FAN1_PIN PF6
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//
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// Misc. Functions
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//
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#define PS_ON_PIN PA4
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#define POWER_LOSS_PIN PA4 // Power-loss / nAC_FAULT
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//
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// SD Card - SDIO
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//
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#define ONBOARD_SDIO
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#define SD_DETECT_PIN PA8
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//
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// NeoPixel / LED
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//
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#define LED_PIN PA15 // Status LED
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//
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// I2C (ESP32 WiFi module on level converter)
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//
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#define I2C_SCL_PIN PB6
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#define I2C_SDA_PIN PB7
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//
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// SPI Flash (onboard W25Q128 via SPI1)
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//
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#define SPI_FLASH
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#if ENABLED(SPI_FLASH)
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#define SPI_DEVICE 1 // SPI1
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#define SPI_FLASH_SIZE 0x1000000 // 16MB
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// SPI1 pins: PA5=SCK, PA6=MISO, PA7=MOSI
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#if !PIN_EXISTS(PS_ON)
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#define SPI_FLASH_CS_PIN PA4 // Flash CS (shares PS_ON_PIN - mutually exclusive)
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#endif
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#define SPI_FLASH_SCK_PIN PA5
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#define SPI_FLASH_MISO_PIN PA6
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#define SPI_FLASH_MOSI_PIN PA7
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#endif
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//
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// Ethernet (LAN8742A RMII)
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//
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#if HAS_ETHERNET
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#ifndef ETH_PHY_TYPE
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#define ETH_PHY_TYPE LAN8742A
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#define ETH_PHY_ADDR 1
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#endif
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// EPHY_RST via level converter - use PF2 (free GPIO, not conflicting with TMC serial)
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#define ETH_RESET_PIN PF2
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#endif
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//
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// LCD / Controller (EXP1/EXP2 connectors)
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//
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#if IS_NEWPANEL
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#define BEEPER_PIN PC7
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#define BTN_EN1 PG11
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#define BTN_EN2 PG10
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#define BTN_ENC PG9
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#ifndef ENCODER_STEPS_PER_MENU_ITEM
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#define ENCODER_STEPS_PER_MENU_ITEM 2
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#endif
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#endif

‎ini/stm32f4.ini‎

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build_flags = ${env:STM32F407VG_btt_USB.build_flags} -O0
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build_unflags = ${env:STM32F407VG_btt_USB.build_unflags} -Os -DNDEBUG
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#
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# Prusa Buddy Board Mini (STM32F407VGT6 ARM Cortex-M4)
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#
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[env:STM32F407VG_prusa_buddy]
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extends = stm32_variant
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platform_packages = ${stm_flash_drive.platform_packages}
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board = marlin_STM32F407VGT6_CCM
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board_build.variant = MARLIN_F4x7Vx
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board_build.offset = 0x8000
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board_upload.offset_address = 0x08008000
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build_flags = ${stm32_variant.build_flags} ${stm_flash_drive.build_flags} ${USB_HS_IN_FS.build_flags}
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-DHSE_VALUE=8000000U -DHAL_SD_MODULE_ENABLED
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-DPIN_SERIAL3_RX=PD_9 -DPIN_SERIAL3_TX=PD_8
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upload_protocol = stlink
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#
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# Prusa Buddy Board Mini (STM32F407VGT6 ARM Cortex-M4) with USB Media Share Support
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#
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[env:STM32F407VG_prusa_buddy_USB]
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extends = env:STM32F407VG_prusa_buddy
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build_flags = ${env:STM32F407VG_prusa_buddy.build_flags} -DUSBD_USE_CDC_MSC
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build_unflags = ${env:STM32F407VG_prusa_buddy.build_unflags} -DUSBD_USE_CDC
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#
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# Bigtreetech SKR V2.0 (STM32F429VGT6 ARM Cortex-M4) with USB Flash Drive Support
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#

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