✨ Prusa Buddy / Buddy XL boards

.github/workflows/ci-build-tests.yml

@@ -125,6 +125,8 @@ jobs:
         - rumba32
         - STM32F401RC_creality
         - STM32F407VE_black
+        - STM32F407VG_prusa_buddy
+        - STM32F427ZI_prusa_xbuddy
         - I3DBEEZ9_V1
 
         # STM32F7

Marlin/src/core/boards.h

@@ -496,6 +496,8 @@
 #define BOARD_ZNP_ROBIN_NANO_V1_3           5260  // Elegoo Neptune 2 v1.3 board
 #define BOARD_MKS_NEPTUNE_X                 5261  // Elegoo Neptune X
 #define BOARD_MKS_NEPTUNE_3                 5262  // Elegoo Neptune 3
+#define BOARD_PRUSA_BUDDY                   5263  // Prusa Buddy Board Mini (STM32F407VGT6)
+#define BOARD_PRUSA_XBUDDY                  5264  // Prusa xBuddy Board (STM32F427ZIT6)
 
 //
 // Other ARM Cortex-M4

Marlin/src/pins/pins.h

@@ -828,6 +828,10 @@
   #include "stm32f4/pins_MKS_NEPTUNE_X.h"           // STM32F4                              env:mks_neptune_x
 #elif MB(MKS_NEPTUNE_3)
   #include "stm32f4/pins_MKS_NEPTUNE_3.h"           // STM32F4                              env:mks_neptune_3
+#elif MB(PRUSA_BUDDY)
+  #include "stm32f4/pins_PRUSA_BUDDY.h"             // STM32F4                              env:STM32F407VG_prusa_buddy env:STM32F407VG_prusa_buddy_USB
+#elif MB(PRUSA_XBUDDY)
+  #include "stm32f4/pins_PRUSA_XBUDDY.h"            // STM32F4                              env:STM32F427ZI_prusa_xbuddy env:STM32F427ZI_prusa_xbuddy_USB
 
 //
 // Other ARM Cortex-M4

Marlin/src/pins/stm32f4/pins_PRUSA_BUDDY.h

@@ -0,0 +1,219 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2026 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/>.
+ *
+ */
+
+/**
+ * pins_PRUSA_BUDDY.h
+ * Prusa Buddy Board Mini pin definitions
+ *
+ * Prusa Buddy Board Mini (Prusa Mini / Mini+)
+ * MCU:    STM32F407VGT6 (STM32F407VG, 100-pin LQFP)
+ *
+ * Schematic: https://github.com/prusa3d/Buddy-board-MINI-PCB
+ */
+
+#pragma once
+
+#define BOARD_INFO_NAME              "Prusa Buddy"
+#define DEFAULT_MACHINE_NAME         "Prusa Mini"
+
+#include "env_validate.h"
+
+//
+// EEPROM
+//
+#if NO_EEPROM_SELECTED
+  #define FLASH_EEPROM_EMULATION
+#endif
+#if ENABLED(FLASH_EEPROM_EMULATION)
+  #define FLASH_EEPROM_LEVELING
+#endif
+
+//
+// Servo pin
+//
+#define SERVO0_PIN                          PE14
+
+//
+// Trinamic Stallguard / Diag pins
+// (Using the UART-based TMC2209 on this board, so diag pins used for endstops)
+//
+#define X_STOP_PIN                          PG3
+#define Y_STOP_PIN                          PG4
+#define Z_STOP_PIN                          PG5
+
+//
+// Z Probe (when not Z_MIN_PIN)
+//
+#ifndef Z_MIN_PROBE_PIN
+  #define Z_MIN_PROBE_PIN                   PG6
+#endif
+
+//
+// Filament Runout
+//
+#define FIL_RUNOUT_PIN                      PE5
+#define FIL_RUNOUT2_PIN                     PE6
+
+//
+// Steppers
+//
+#define X_STEP_PIN                          PG1
+#define X_DIR_PIN                           PB10
+#define X_ENABLE_PIN                        PG0
+
+#define Y_STEP_PIN                          PF14
+#define Y_DIR_PIN                           PF15
+#define Y_ENABLE_PIN                        PF13
+
+#define Z_STEP_PIN                          PF11
+#define Z_DIR_PIN                           PF12
+#define Z_ENABLE_PIN                        PC5
+
+#define E0_STEP_PIN                         PC14
+#define E0_DIR_PIN                          PC13
+#define E0_ENABLE_PIN                       PC15
+
+//
+// TMC2209 UART Stepper Drivers
+//
+#if HAS_TMC_UART
+  #ifndef X_SERIAL_TX_PIN
+    #define X_SERIAL_TX_PIN                 PB2
+  #endif
+  #ifndef Y_SERIAL_TX_PIN
+    #define Y_SERIAL_TX_PIN                 PE2
+  #endif
+  #ifndef Z_SERIAL_TX_PIN
+    #define Z_SERIAL_TX_PIN                 PE3
+  #endif
+  #ifndef E0_SERIAL_TX_PIN
+    #define E0_SERIAL_TX_PIN                PE4
+  #endif
+
+  // Reduce baud rate to improve software serial reliability
+  #ifndef TMC_BAUD_RATE
+    #define TMC_BAUD_RATE            19200
+  #endif
+#endif
+
+//
+// UART connector (J7) - USART3 via alternate pins
+// PB10 is already used for X_DIR_PIN, so use alternate USART3 pins
+//
+#define BOARD_UART_TX_PIN                   PD8   // USART3_TX (alternate)
+#define BOARD_UART_RX_PIN                   PD9   // USART3_RX (alternate)
+
+//
+// Temperature Sensors
+//
+// TODO: Upstream Prusa firmware marks these as "Dummy, measured by puppy"
+//   — indicating external measurement via a separate controller/daughter-board.
+//   Verify whether local ADC reads are valid or if values come over I2C/CAN.
+//
+#define TEMP_0_PIN                          PC1   // Analog Input - THERM0 (Nozzle)
+#define TEMP_1_PIN                          PC2   // Analog Input - THERM1
+#define TEMP_BED_PIN                        PC0   // Analog Input - BED_THERM
+
+//
+// Heaters / Fans
+//
+// TODO: Upstream Prusa firmware marks HEATER_0 and HEATER_BED as
+//   "Dummy, measured by puppy" — heater PWM may be driven externally.
+//
+#define HEATER_0_PIN                        PA1
+#define HEATER_BED_PIN                      PA2
+
+// TODO: Upstream Prusa firmware has "#undef E0_AUTO_FAN_PIN" with the note
+//   "no auto fan pin - handled by dwarf". The "dwarf" appears to be a
+//   daughter-board or CANbus peripheral that manages fan control.
+//   Investigate dwarf interface before enabling AUTO_FAN here.
+//
+#ifndef FAN0_PIN
+  #define FAN0_PIN                          PF7
+#endif
+#define FAN1_PIN                            PF6
+
+//
+// Misc. Functions
+//
+#if ENABLED(PSU_CONTROL)
+  #define PS_ON_PIN                         PA4
+#endif
+#define POWER_LOSS_PIN                      PA4   // Power-loss / nAC_FAULT
+
+//
+// SD Card - SDIO
+//
+#define ONBOARD_SDIO
+#define SD_DETECT_PIN                       PA8
+
+//
+// NeoPixel / LED
+//
+#define LED_PIN                             PA15  // Status LED
+
+//
+// I2C (ESP32 WiFi module on level converter)
+//
+#define I2C_SCL_PIN                         PB6
+#define I2C_SDA_PIN                         PB7
+
+//
+// SPI Flash (onboard W25Q128 via SPI1)
+//
+#define SPI_FLASH
+#if ENABLED(SPI_FLASH)
+  #define SPI_DEVICE                 1     // SPI1
+  #define SPI_FLASH_SIZE             0x1000000 // 16MB
+  // SPI1 pins: PA5=SCK, PA6=MISO, PA7=MOSI
+  #if !PIN_EXISTS(PS_ON)
+    #define SPI_FLASH_CS_PIN                PA4   // Flash CS (shares PS_ON_PIN - mutually exclusive)
+  #endif
+  #define SPI_FLASH_SCK_PIN                 PA5
+  #define SPI_FLASH_MISO_PIN                PA6
+  #define SPI_FLASH_MOSI_PIN                PA7
+#endif
+
+//
+// Ethernet (LAN8742A RMII)
+//
+#if HAS_ETHERNET
+  #ifndef ETH_PHY_TYPE
+    #define ETH_PHY_TYPE                LAN8742A
+    #define ETH_PHY_ADDR             1
+  #endif
+  // EPHY_RST via level converter - use PF2 (free GPIO, not conflicting with TMC serial)
+  #define ETH_RESET_PIN                     PF2
+#endif
+
+//
+// LCD / Controller (EXP1/EXP2 connectors)
+//
+#if IS_NEWPANEL
+  #define BEEPER_PIN                        PC7
+  #define BTN_EN1                           PG11
+  #define BTN_EN2                           PG10
+  #define BTN_ENC                           PG9
+  #ifndef ENCODER_STEPS_PER_MENU_ITEM
+    #define ENCODER_STEPS_PER_MENU_ITEM 2
+  #endif
+#endif