From aabd3e9e196ccbe04f94a26cd25e4d3508c262f9 Mon Sep 17 00:00:00 2001
From: ellensp <530024+ellensp@users.noreply.github.com>
Date: Wed, 14 Sep 2022 05:27:16 +1200
Subject: [PATCH] =?UTF-8?q?=E2=9C=A8=20BTT=20SKR=20Mini=20E3=20V3.0.1=20(#?=
=?UTF-8?q?24722)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
---
Marlin/src/core/boards.h | 79 ++--
Marlin/src/pins/pins.h | 2 +
.../stm32f1/pins_BTT_SKR_MINI_E3_common.h | 62 ++--
Marlin/src/pins/stm32f4/pins_ARMED.h | 5 +-
.../stm32f4/pins_BTT_SKR_MINI_E3_V3_0_1.h | 350 ++++++++++++++++++
.../PlatformIO/boards/marlin_STM32F401RC.json | 38 ++
.../variants/MARLIN_F401RC/PeripheralPins.c | 256 +++++++++++++
.../variants/MARLIN_F401RC/PinNamesVar.h | 52 +++
.../variants/MARLIN_F401RC/ldscript.ld | 177 +++++++++
.../variant_MARLIN_STM32F401RC.cpp | 223 +++++++++++
.../variant_MARLIN_STM32F401RC.h | 186 ++++++++++
ini/stm32f4.ini | 18 +
12 files changed, 1378 insertions(+), 70 deletions(-)
create mode 100644 Marlin/src/pins/stm32f4/pins_BTT_SKR_MINI_E3_V3_0_1.h
create mode 100644 buildroot/share/PlatformIO/boards/marlin_STM32F401RC.json
create mode 100644 buildroot/share/PlatformIO/variants/MARLIN_F401RC/PeripheralPins.c
create mode 100644 buildroot/share/PlatformIO/variants/MARLIN_F401RC/PinNamesVar.h
create mode 100644 buildroot/share/PlatformIO/variants/MARLIN_F401RC/ldscript.ld
create mode 100644 buildroot/share/PlatformIO/variants/MARLIN_F401RC/variant_MARLIN_STM32F401RC.cpp
create mode 100644 buildroot/share/PlatformIO/variants/MARLIN_F401RC/variant_MARLIN_STM32F401RC.h
diff --git a/Marlin/src/core/boards.h b/Marlin/src/core/boards.h
index 272a82f3b7..f3f5c01d2d 100644
--- a/Marlin/src/core/boards.h
+++ b/Marlin/src/core/boards.h
@@ -329,45 +329,46 @@
#define BOARD_BTT_SKR_MINI_E3_V1_2 4025 // BigTreeTech SKR Mini E3 V1.2 (STM32F103RC)
#define BOARD_BTT_SKR_MINI_E3_V2_0 4026 // BigTreeTech SKR Mini E3 V2.0 (STM32F103RC / STM32F103RE)
#define BOARD_BTT_SKR_MINI_E3_V3_0 4027 // BigTreeTech SKR Mini E3 V3.0 (STM32G0B1RE)
-#define BOARD_BTT_SKR_MINI_MZ_V1_0 4028 // BigTreeTech SKR Mini MZ V1.0 (STM32F103RC)
-#define BOARD_BTT_SKR_E3_DIP 4029 // BigTreeTech SKR E3 DIP V1.0 (STM32F103RC / STM32F103RE)
-#define BOARD_BTT_SKR_CR6 4030 // BigTreeTech SKR CR6 v1.0 (STM32F103RE)
-#define BOARD_JGAURORA_A5S_A1 4031 // JGAurora A5S A1 (STM32F103ZE)
-#define BOARD_FYSETC_AIO_II 4032 // FYSETC AIO_II (STM32F103RC)
-#define BOARD_FYSETC_CHEETAH 4033 // FYSETC Cheetah (STM32F103RC)
-#define BOARD_FYSETC_CHEETAH_V12 4034 // FYSETC Cheetah V1.2 (STM32F103RC)
-#define BOARD_LONGER3D_LK 4035 // Longer3D LK1/2 - Alfawise U20/U20+/U30 (STM32F103VE)
-#define BOARD_CCROBOT_MEEB_3DP 4036 // ccrobot-online.com MEEB_3DP (STM32F103RC)
-#define BOARD_CHITU3D_V5 4037 // Chitu3D TronXY X5SA V5 Board (STM32F103ZE)
-#define BOARD_CHITU3D_V6 4038 // Chitu3D TronXY X5SA V6 Board (STM32F103ZE)
-#define BOARD_CHITU3D_V9 4039 // Chitu3D TronXY X5SA V9 Board (STM32F103ZE)
-#define BOARD_CREALITY_V4 4040 // Creality v4.x (STM32F103RC / STM32F103RE)
-#define BOARD_CREALITY_V422 4041 // Creality v4.2.2 (STM32F103RC / STM32F103RE)
-#define BOARD_CREALITY_V423 4042 // Creality v4.2.3 (STM32F103RC / STM32F103RE)
-#define BOARD_CREALITY_V425 4043 // Creality v4.2.5 (STM32F103RC / STM32F103RE)
-#define BOARD_CREALITY_V427 4044 // Creality v4.2.7 (STM32F103RC / STM32F103RE)
-#define BOARD_CREALITY_V4210 4045 // Creality v4.2.10 (STM32F103RC / STM32F103RE) as found in the CR-30
-#define BOARD_CREALITY_V431 4046 // Creality v4.3.1 (STM32F103RC / STM32F103RE)
-#define BOARD_CREALITY_V431_A 4047 // Creality v4.3.1a (STM32F103RC / STM32F103RE)
-#define BOARD_CREALITY_V431_B 4048 // Creality v4.3.1b (STM32F103RC / STM32F103RE)
-#define BOARD_CREALITY_V431_C 4049 // Creality v4.3.1c (STM32F103RC / STM32F103RE)
-#define BOARD_CREALITY_V431_D 4050 // Creality v4.3.1d (STM32F103RC / STM32F103RE)
-#define BOARD_CREALITY_V452 4051 // Creality v4.5.2 (STM32F103RC / STM32F103RE)
-#define BOARD_CREALITY_V453 4052 // Creality v4.5.3 (STM32F103RC / STM32F103RE)
-#define BOARD_CREALITY_V24S1 4053 // Creality v2.4.S1 (STM32F103RC / STM32F103RE) v101 as found in the Ender-7
-#define BOARD_CREALITY_V24S1_301 4054 // Creality v2.4.S1_301 (STM32F103RC / STM32F103RE) v301 as found in the Ender-3 S1
-#define BOARD_CREALITY_V25S1 4055 // Creality v2.5.S1 (STM32F103RE) as found in the CR-10 Smart Pro
-#define BOARD_TRIGORILLA_PRO 4056 // Trigorilla Pro (STM32F103ZE)
-#define BOARD_FLY_MINI 4057 // FLYmaker FLY MINI (STM32F103RC)
-#define BOARD_FLSUN_HISPEED 4058 // FLSUN HiSpeedV1 (STM32F103VE)
-#define BOARD_BEAST 4059 // STM32F103RE Libmaple-based controller
-#define BOARD_MINGDA_MPX_ARM_MINI 4060 // STM32F103ZE Mingda MD-16
-#define BOARD_GTM32_PRO_VD 4061 // STM32F103VE controller
-#define BOARD_ZONESTAR_ZM3E2 4062 // Zonestar ZM3E2 (STM32F103RC)
-#define BOARD_ZONESTAR_ZM3E4 4063 // Zonestar ZM3E4 V1 (STM32F103VC)
-#define BOARD_ZONESTAR_ZM3E4V2 4064 // Zonestar ZM3E4 V2 (STM32F103VC)
-#define BOARD_ERYONE_ERY32_MINI 4065 // Eryone Ery32 mini (STM32F103VE)
-#define BOARD_PANDA_PI_V29 4066 // Panda Pi V2.9 - Standalone (STM32F103RC)
+#define BOARD_BTT_SKR_MINI_E3_V3_0_1 4028 // BigTreeTech SKR Mini E3 V3.0.1 (STM32F401RC)
+#define BOARD_BTT_SKR_MINI_MZ_V1_0 4029 // BigTreeTech SKR Mini MZ V1.0 (STM32F103RC)
+#define BOARD_BTT_SKR_E3_DIP 4030 // BigTreeTech SKR E3 DIP V1.0 (STM32F103RC / STM32F103RE)
+#define BOARD_BTT_SKR_CR6 4031 // BigTreeTech SKR CR6 v1.0 (STM32F103RE)
+#define BOARD_JGAURORA_A5S_A1 4032 // JGAurora A5S A1 (STM32F103ZE)
+#define BOARD_FYSETC_AIO_II 4033 // FYSETC AIO_II (STM32F103RC)
+#define BOARD_FYSETC_CHEETAH 4034 // FYSETC Cheetah (STM32F103RC)
+#define BOARD_FYSETC_CHEETAH_V12 4035 // FYSETC Cheetah V1.2 (STM32F103RC)
+#define BOARD_LONGER3D_LK 4036 // Longer3D LK1/2 - Alfawise U20/U20+/U30 (STM32F103VE)
+#define BOARD_CCROBOT_MEEB_3DP 4037 // ccrobot-online.com MEEB_3DP (STM32F103RC)
+#define BOARD_CHITU3D_V5 4038 // Chitu3D TronXY X5SA V5 Board (STM32F103ZE)
+#define BOARD_CHITU3D_V6 4039 // Chitu3D TronXY X5SA V6 Board (STM32F103ZE)
+#define BOARD_CHITU3D_V9 4040 // Chitu3D TronXY X5SA V9 Board (STM32F103ZE)
+#define BOARD_CREALITY_V4 4041 // Creality v4.x (STM32F103RC / STM32F103RE)
+#define BOARD_CREALITY_V422 4042 // Creality v4.2.2 (STM32F103RC / STM32F103RE)
+#define BOARD_CREALITY_V423 4043 // Creality v4.2.3 (STM32F103RC / STM32F103RE)
+#define BOARD_CREALITY_V425 4044 // Creality v4.2.5 (STM32F103RC / STM32F103RE)
+#define BOARD_CREALITY_V427 4045 // Creality v4.2.7 (STM32F103RC / STM32F103RE)
+#define BOARD_CREALITY_V4210 4046 // Creality v4.2.10 (STM32F103RC / STM32F103RE) as found in the CR-30
+#define BOARD_CREALITY_V431 4047 // Creality v4.3.1 (STM32F103RC / STM32F103RE)
+#define BOARD_CREALITY_V431_A 4048 // Creality v4.3.1a (STM32F103RC / STM32F103RE)
+#define BOARD_CREALITY_V431_B 4049 // Creality v4.3.1b (STM32F103RC / STM32F103RE)
+#define BOARD_CREALITY_V431_C 4050 // Creality v4.3.1c (STM32F103RC / STM32F103RE)
+#define BOARD_CREALITY_V431_D 4051 // Creality v4.3.1d (STM32F103RC / STM32F103RE)
+#define BOARD_CREALITY_V452 4052 // Creality v4.5.2 (STM32F103RC / STM32F103RE)
+#define BOARD_CREALITY_V453 4053 // Creality v4.5.3 (STM32F103RC / STM32F103RE)
+#define BOARD_CREALITY_V24S1 4054 // Creality v2.4.S1 (STM32F103RC / STM32F103RE) v101 as found in the Ender-7
+#define BOARD_CREALITY_V24S1_301 4055 // Creality v2.4.S1_301 (STM32F103RC / STM32F103RE) v301 as found in the Ender-3 S1
+#define BOARD_CREALITY_V25S1 4056 // Creality v2.5.S1 (STM32F103RE) as found in the CR-10 Smart Pro
+#define BOARD_TRIGORILLA_PRO 4057 // Trigorilla Pro (STM32F103ZE)
+#define BOARD_FLY_MINI 4058 // FLYmaker FLY MINI (STM32F103RC)
+#define BOARD_FLSUN_HISPEED 4059 // FLSUN HiSpeedV1 (STM32F103VE)
+#define BOARD_BEAST 4060 // STM32F103RE Libmaple-based controller
+#define BOARD_MINGDA_MPX_ARM_MINI 4061 // STM32F103ZE Mingda MD-16
+#define BOARD_GTM32_PRO_VD 4062 // STM32F103VE controller
+#define BOARD_ZONESTAR_ZM3E2 4063 // Zonestar ZM3E2 (STM32F103RC)
+#define BOARD_ZONESTAR_ZM3E4 4064 // Zonestar ZM3E4 V1 (STM32F103VC)
+#define BOARD_ZONESTAR_ZM3E4V2 4065 // Zonestar ZM3E4 V2 (STM32F103VC)
+#define BOARD_ERYONE_ERY32_MINI 4066 // Eryone Ery32 mini (STM32F103VE)
+#define BOARD_PANDA_PI_V29 4067 // Panda Pi V2.9 - Standalone (STM32F103RC)
//
// ARM Cortex-M4F
diff --git a/Marlin/src/pins/pins.h b/Marlin/src/pins/pins.h
index e2f6ea2924..384f06ecfd 100644
--- a/Marlin/src/pins/pins.h
+++ b/Marlin/src/pins/pins.h
@@ -541,6 +541,8 @@
#include "stm32f1/pins_BTT_SKR_MINI_E3_V2_0.h" // STM32F1 env:STM32F103RC_btt env:STM32F103RC_btt_USB env:STM32F103RE_btt env:STM32F103RE_btt_USB env:STM32F103RC_btt_maple env:STM32F103RC_btt_USB_maple env:STM32F103RE_btt_maple env:STM32F103RE_btt_USB_maple
#elif MB(BTT_SKR_MINI_E3_V3_0)
#include "stm32g0/pins_BTT_SKR_MINI_E3_V3_0.h" // STM32G0 env:STM32G0B1RE_btt env:STM32G0B1RE_btt_xfer
+#elif MB(BTT_SKR_MINI_E3_V3_0_1)
+ #include "stm32f4/pins_BTT_SKR_MINI_E3_V3_0_1.h"// STM32F4 env:STM32F401RC_btt
#elif MB(BTT_SKR_MINI_MZ_V1_0)
#include "stm32f1/pins_BTT_SKR_MINI_MZ_V1_0.h" // STM32F1 env:STM32F103RC_btt env:STM32F103RC_btt_USB env:STM32F103RC_btt_maple env:STM32F103RC_btt_USB_maple
#elif MB(BTT_SKR_E3_DIP)
diff --git a/Marlin/src/pins/stm32f1/pins_BTT_SKR_MINI_E3_common.h b/Marlin/src/pins/stm32f1/pins_BTT_SKR_MINI_E3_common.h
index 537e905e21..c4a8971265 100644
--- a/Marlin/src/pins/stm32f1/pins_BTT_SKR_MINI_E3_common.h
+++ b/Marlin/src/pins/stm32f1/pins_BTT_SKR_MINI_E3_common.h
@@ -135,6 +135,12 @@
#define EXP1_02_PIN PB6
#define EXP1_08_PIN PB7
#endif
+#define EXP1_01_PIN PB5
+#define EXP1_03_PIN PA9
+#define EXP1_04_PIN -1 // RESET
+#define EXP1_05_PIN PA10
+#define EXP1_06_PIN PB9
+#define EXP1_07_PIN PB8
#if HAS_DWIN_E3V2 || IS_DWIN_MARLINUI
/**
@@ -156,22 +162,22 @@
#define BEEPER_PIN EXP1_02_PIN
#define BTN_EN1 EXP1_08_PIN
- #define BTN_EN2 PB8
- #define BTN_ENC PB5
+ #define BTN_EN2 EXP1_07_PIN
+ #define BTN_ENC EXP1_01_PIN
#elif HAS_WIRED_LCD
#if ENABLED(CR10_STOCKDISPLAY)
- #define BEEPER_PIN PB5
+ #define BEEPER_PIN EXP1_01_PIN
#define BTN_ENC EXP1_02_PIN
- #define BTN_EN1 PA9
- #define BTN_EN2 PA10
+ #define BTN_EN1 EXP1_03_PIN
+ #define BTN_EN2 EXP1_05_PIN
- #define LCD_PINS_RS PB8
+ #define LCD_PINS_RS EXP1_07_PIN
#define LCD_PINS_ENABLE EXP1_08_PIN
- #define LCD_PINS_D4 PB9
+ #define LCD_PINS_D4 EXP1_06_PIN
#elif ENABLED(ZONESTAR_LCD) // ANET A8 LCD Controller - Must convert to 3.3V - CONNECTING TO 5V WILL DAMAGE THE BOARD!
@@ -179,23 +185,23 @@
#error "CAUTION! ZONESTAR_LCD requires wiring modifications. See 'pins_BTT_SKR_MINI_E3_common.h' for details. (Define NO_CONTROLLER_CUSTOM_WIRING_WARNING to suppress this warning.)"
#endif
- #define LCD_PINS_RS PB9
+ #define LCD_PINS_RS EXP1_06_PIN
#define LCD_PINS_ENABLE EXP1_02_PIN
- #define LCD_PINS_D4 PB8
- #define LCD_PINS_D5 PA10
- #define LCD_PINS_D6 PA9
- #define LCD_PINS_D7 PB5
+ #define LCD_PINS_D4 EXP1_07_PIN
+ #define LCD_PINS_D5 EXP1_05_PIN
+ #define LCD_PINS_D6 EXP1_03_PIN
+ #define LCD_PINS_D7 EXP1_01_PIN
#define ADC_KEYPAD_PIN PA1 // Repurpose servo pin for ADC - CONNECTING TO 5V WILL DAMAGE THE BOARD!
#elif EITHER(MKS_MINI_12864, ENDER2_STOCKDISPLAY)
#define BTN_ENC EXP1_02_PIN
- #define BTN_EN1 PA9
- #define BTN_EN2 PA10
+ #define BTN_EN1 EXP1_03_PIN
+ #define BTN_EN2 EXP1_05_PIN
- #define DOGLCD_CS PB8
- #define DOGLCD_A0 PB9
- #define DOGLCD_SCK PB5
+ #define DOGLCD_CS EXP1_07_PIN
+ #define DOGLCD_A0 EXP1_06_PIN
+ #define DOGLCD_SCK EXP1_01_PIN
#define DOGLCD_MOSI EXP1_08_PIN
#define FORCE_SOFT_SPI
@@ -238,7 +244,7 @@
* EXP1-1 ----------- EXP1-7 SD_DET
*/
- #define TFTGLCD_CS PA9
+ #define TFTGLCD_CS EXP1_03_PIN
#endif
@@ -291,20 +297,20 @@
* for backlight configuration see steps 2 (V2.1) and 3 in https://wiki.fysetc.com/Mini12864_Panel/
*/
- #define LCD_PINS_RS PA9 // CS
+ #define LCD_PINS_RS EXP1_03_PIN // CS
#define LCD_PINS_ENABLE PA3 // MOSI
#define LCD_BACKLIGHT_PIN -1
- #define NEOPIXEL_PIN PB8
+ #define NEOPIXEL_PIN EXP1_07_PIN
#define LCD_CONTRAST 255
- #define LCD_RESET_PIN PA10
+ #define LCD_RESET_PIN EXP1_05_PIN
- #define DOGLCD_CS PA9
- #define DOGLCD_A0 PB5
+ #define DOGLCD_CS EXP1_03_PIN
+ #define DOGLCD_A0 EXP1_01_PIN
#define DOGLCD_SCK PA2
#define DOGLCD_MOSI PA3
#define BTN_ENC PA15
- #define BTN_EN1 PB9
+ #define BTN_EN1 EXP1_06_PIN
#define BTN_EN2 PB15
#define FORCE_SOFT_SPI
@@ -354,8 +360,8 @@
#define BEEPER_PIN EXP1_02_PIN
- #define CLCD_MOD_RESET PA9
- #define CLCD_SPI_CS PB8
+ #define CLCD_MOD_RESET EXP1_03_PIN
+ #define CLCD_SPI_CS EXP1_07_PIN
#endif // TOUCH_UI_FTDI_EVE && LCD_FYSETC_TFT81050
@@ -370,8 +376,8 @@
#if SD_CONNECTION_IS(ONBOARD)
#define SD_DETECT_PIN PC4
#elif SD_CONNECTION_IS(LCD) && (BOTH(TOUCH_UI_FTDI_EVE, LCD_FYSETC_TFT81050) || IS_TFTGLCD_PANEL)
- #define SD_DETECT_PIN PB5
- #define SD_SS_PIN PA10
+ #define SD_DETECT_PIN EXP1_01_PIN
+ #define SD_SS_PIN EXP1_05_PIN
#elif SD_CONNECTION_IS(CUSTOM_CABLE)
#error "SD CUSTOM_CABLE is not compatible with SKR Mini E3."
#endif
diff --git a/Marlin/src/pins/stm32f4/pins_ARMED.h b/Marlin/src/pins/stm32f4/pins_ARMED.h
index d08d3fb66c..2abcc21da5 100644
--- a/Marlin/src/pins/stm32f4/pins_ARMED.h
+++ b/Marlin/src/pins/stm32f4/pins_ARMED.h
@@ -19,11 +19,10 @@
* along with this program. If not, see .
*
*/
-
-// https://github.com/ktand/Armed
-
#pragma once
+// https://github.com/ktand/Armed
+
#include "env_validate.h"
#if HOTENDS > 2 || E_STEPPERS > 2
diff --git a/Marlin/src/pins/stm32f4/pins_BTT_SKR_MINI_E3_V3_0_1.h b/Marlin/src/pins/stm32f4/pins_BTT_SKR_MINI_E3_V3_0_1.h
new file mode 100644
index 0000000000..1e278cd4ba
--- /dev/null
+++ b/Marlin/src/pins/stm32f4/pins_BTT_SKR_MINI_E3_V3_0_1.h
@@ -0,0 +1,350 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2022 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 .
+ *
+ */
+#pragma once
+
+//#define BOARD_CUSTOM_BUILD_FLAGS -DTONE_CHANNEL=4 -DTONE_TIMER=4 -DTIMER_TONE=4
+
+#include "env_validate.h"
+
+#if HOTENDS > 1 || E_STEPPERS > 1
+ #error "BTT SKR Mini E3 V3.0.1 supports up to 1 hotend / E stepper."
+#endif
+
+#ifndef BOARD_INFO_NAME
+ #define BOARD_INFO_NAME "BTT SKR Mini E3 V3.0.1"
+#endif
+
+#define USES_DIAG_JUMPERS
+
+// Ignore temp readings during development.
+//#define BOGUS_TEMPERATURE_GRACE_PERIOD 2000
+
+#ifndef NEOPIXEL_LED
+ #define LED_PIN PA14
+#endif
+
+// Onboard I2C EEPROM
+#if EITHER(NO_EEPROM_SELECTED, I2C_EEPROM)
+ #undef NO_EEPROM_SELECTED
+ #define I2C_EEPROM
+ #define SOFT_I2C_EEPROM // Force the use of Software I2C
+ #define I2C_SCL_PIN PB8
+ #define I2C_SDA_PIN PB9
+ #define MARLIN_EEPROM_SIZE 0x1000 // 4KB
+#endif
+
+//
+// Servos
+//
+#define SERVO0_PIN PA0 // SERVOS
+
+//
+// Limit Switches
+//
+#define X_STOP_PIN PB5 // X-STOP
+#define Y_STOP_PIN PB6 // Y-STOP
+#define Z_STOP_PIN PB7 // Z-STOP
+
+//
+// Z Probe must be this pin
+//
+#define Z_MIN_PROBE_PIN PA1 // PROBE
+
+//
+// Filament Runout Sensor
+//
+#ifndef FIL_RUNOUT_PIN
+ #define FIL_RUNOUT_PIN PC15 // E0-STOP
+#endif
+
+//
+// Power-loss Detection
+//
+#ifndef POWER_LOSS_PIN
+ #define POWER_LOSS_PIN PC13 // Power Loss Detection: PWR-DET
+#endif
+
+#ifndef NEOPIXEL_PIN
+ #define NEOPIXEL_PIN PA14 // LED driving pin
+#endif
+
+#ifndef PS_ON_PIN
+ #define PS_ON_PIN PC14 // Power Supply Control
+#endif
+
+//
+// Steppers
+//
+#define X_ENABLE_PIN PC10
+#define X_STEP_PIN PC11
+#define X_DIR_PIN PC12
+
+#define Y_ENABLE_PIN PB13
+#define Y_STEP_PIN PB12
+#define Y_DIR_PIN PB10
+
+#define Z_ENABLE_PIN PB2
+#define Z_STEP_PIN PB1
+#define Z_DIR_PIN PB0
+
+#define E0_ENABLE_PIN PC3
+#define E0_STEP_PIN PC2
+#define E0_DIR_PIN PC1
+
+#if HAS_TMC_UART
+ /**
+ * TMC220x stepper drivers
+ * Hardware serial communication ports
+ */
+ #define X_HARDWARE_SERIAL MSerial6
+ #define Y_HARDWARE_SERIAL MSerial6
+ #define Z_HARDWARE_SERIAL MSerial6
+ #define E0_HARDWARE_SERIAL MSerial6
+
+ // Default TMC slave addresses
+ #ifndef X_SLAVE_ADDRESS
+ #define X_SLAVE_ADDRESS 0
+ #endif
+ #ifndef Y_SLAVE_ADDRESS
+ #define Y_SLAVE_ADDRESS 2
+ #endif
+ #ifndef Z_SLAVE_ADDRESS
+ #define Z_SLAVE_ADDRESS 1
+ #endif
+ #ifndef E0_SLAVE_ADDRESS
+ #define E0_SLAVE_ADDRESS 3
+ #endif
+#endif
+
+//
+// Temperature Sensors
+//
+#define TEMP_0_PIN PC5 // Analog Input "TH0"
+#define TEMP_BED_PIN PC4 // Analog Input "TB0"
+
+//
+// Heaters / Fans
+//
+#define HEATER_0_PIN PA15 // "HE"
+#define HEATER_BED_PIN PB3 // "HB"
+#define FAN_PIN PC9 // "FAN0"
+#define FAN1_PIN PA8 // "FAN1"
+#define FAN2_PIN PC8 // "FAN2"
+
+/**
+ * SKR Mini E3 V3.0.1
+ * ------
+ * (BEEPER) PB15 | 1 2 | PB14 (BTN_ENC)
+ * (BTN_EN1) PA9 | 3 4 | RESET
+ * (BTN_EN2) PA10 5 6 | PB4 (LCD_D4)
+ * (LCD_RS) PD2 | 7 8 | PC0 (LCD_EN)
+ * GND | 9 10 | 5V
+ * ------
+ * EXP1
+ */
+#define EXP1_01_PIN PB15
+#define EXP1_02_PIN PB14
+#define EXP1_03_PIN PA9
+#define EXP1_04_PIN -1 // RESET
+#define EXP1_05_PIN PA10
+#define EXP1_06_PIN PB4
+#define EXP1_07_PIN PD2
+#define EXP1_08_PIN PC0
+
+#if HAS_DWIN_E3V2 || IS_DWIN_MARLINUI
+ /**
+ * ------ ------ ------
+ * (ENT) | 1 2 | (BEEP) |10 9 | |10 9 |
+ * (RX) | 3 4 | (RX) | 8 7 | (TX) RX | 8 7 | TX
+ * (TX) 5 6 | (ENT) 6 5 | (BEEP) ENT | 6 5 | BEEP
+ * (B) | 7 8 | (A) (B) | 4 3 | (A) B | 4 3 | A
+ * GND | 9 10 | (VCC) GND | 2 1 | VCC GND | 2 1 | VCC
+ * ------ ------ ------
+ * EXP1 DWIN DWIN (plug)
+ *
+ * All pins are labeled as printed on DWIN PCB. Connect TX-TX, A-A and so on.
+ */
+
+ #error "DWIN_CREALITY_LCD requires a custom cable, see diagram above this line. Comment out this line to continue."
+
+ #define BEEPER_PIN EXP1_02_PIN
+ #define BTN_EN1 EXP1_08_PIN
+ #define BTN_EN2 EXP1_07_PIN
+ #define BTN_ENC EXP1_01_PIN
+
+#elif HAS_WIRED_LCD
+
+ #if ENABLED(CR10_STOCKDISPLAY)
+
+ #define BEEPER_PIN EXP1_01_PIN
+ #define BTN_ENC EXP1_02_PIN
+
+ #define BTN_EN1 EXP1_03_PIN
+ #define BTN_EN2 EXP1_05_PIN
+
+ #define LCD_PINS_RS EXP1_07_PIN
+ #define LCD_PINS_ENABLE EXP1_08_PIN
+ #define LCD_PINS_D4 EXP1_06_PIN
+
+ #elif ENABLED(ZONESTAR_LCD) // ANET A8 LCD Controller - Must convert to 3.3V - CONNECTING TO 5V WILL DAMAGE THE BOARD!
+
+ #ifndef NO_CONTROLLER_CUSTOM_WIRING_WARNING
+ #error "CAUTION! ZONESTAR_LCD requires wiring modifications. See 'pins_BTT_SKR_MINI_E3_common.h' for details. (Define NO_CONTROLLER_CUSTOM_WIRING_WARNING to suppress this warning.)"
+ #endif
+
+ #define LCD_PINS_RS EXP1_06_PIN
+ #define LCD_PINS_ENABLE EXP1_02_PIN
+ #define LCD_PINS_D4 EXP1_07_PIN
+ #define LCD_PINS_D5 EXP1_05_PIN
+ #define LCD_PINS_D6 EXP1_03_PIN
+ #define LCD_PINS_D7 EXP1_01_PIN
+ #define ADC_KEYPAD_PIN PA1 // Repurpose servo pin for ADC - CONNECTING TO 5V WILL DAMAGE THE BOARD!
+
+ #elif EITHER(MKS_MINI_12864, ENDER2_STOCKDISPLAY)
+
+ #define BTN_ENC EXP1_02_PIN
+ #define BTN_EN1 EXP1_03_PIN
+ #define BTN_EN2 EXP1_05_PIN
+
+ #define DOGLCD_CS EXP1_07_PIN
+ #define DOGLCD_A0 EXP1_06_PIN
+ #define DOGLCD_SCK EXP1_01_PIN
+ #define DOGLCD_MOSI EXP1_08_PIN
+
+ #define FORCE_SOFT_SPI
+ #define LCD_BACKLIGHT_PIN -1
+
+ #elif IS_TFTGLCD_PANEL
+
+ #if ENABLED(TFTGLCD_PANEL_SPI)
+
+ #ifndef NO_CONTROLLER_CUSTOM_WIRING_WARNING
+ #error "CAUTION! TFTGLCD_PANEL_SPI requires wiring modifications. See 'pins_BTT_SKR_MINI_E3_common.h' for details. (Define NO_CONTROLLER_CUSTOM_WIRING_WARNING to suppress this warning.)"
+ #endif
+
+ /**
+ * TFTGLCD_PANEL_SPI display pinout
+ *
+ * Board Display
+ * ------ ------
+ * (BEEPER) PB6 | 1 2 | PB15 (SD_DET) 5V |10 9 | GND
+ * RESET | 3 4 | PA9 (MOD_RESET) -- | 8 7 | (SD_DET)
+ * PB4 5 6 | PA10 (SD_CS) (MOSI) | 6 5 | --
+ * PB7 | 7 8 | PD2 (LCD_CS) (SD_CS) | 4 3 | (LCD_CS)
+ * GND | 9 10 | 5V (SCK) | 2 1 | (MISO)
+ * ------ ------
+ * EXP1 EXP1
+ *
+ * Needs custom cable:
+ *
+ * Board Display
+ *
+ * EXP1-10 ---------- EXP1-10
+ * EXP1-9 ----------- EXP1-9
+ * SPI1-4 ----------- EXP1-6
+ * EXP1-7 ----------- FREE
+ * SPI1-3 ----------- EXP1-2
+ * EXP1-5 ----------- EXP1-4
+ * EXP1-4 ----------- FREE
+ * EXP1-3 ----------- EXP1-3
+ * SPI1-1 ----------- EXP1-1
+ * EXP1-1 ----------- EXP1-7
+ */
+
+ #define TFTGLCD_CS EXP1_03_PIN
+
+ #endif
+
+ #else
+ #error "Only CR10_STOCKDISPLAY, ZONESTAR_LCD, ENDER2_STOCKDISPLAY, MKS_MINI_12864, and TFTGLCD_PANEL_(SPI|I2C) are currently supported on the BIGTREE_SKR_MINI_E3."
+ #endif
+
+#endif // HAS_WIRED_LCD
+
+#if BOTH(TOUCH_UI_FTDI_EVE, LCD_FYSETC_TFT81050)
+
+ #ifndef NO_CONTROLLER_CUSTOM_WIRING_WARNING
+ #error "CAUTION! LCD_FYSETC_TFT81050 requires wiring modifications. See 'pins_BTT_SKR_MINI_E3_common.h' for details. (Define NO_CONTROLLER_CUSTOM_WIRING_WARNING to suppress this warning.)"
+ #endif
+
+ /**
+ * FYSETC TFT TFT81050 display pinout
+ *
+ * Board Display
+ * ------ ------
+ * (SD_DET) PB15 | 1 2 | PB6 (BEEPER) 5V |10 9 | GND
+ * (MOD_RESET) PA9 | 3 4 | RESET (RESET) | 8 7 | (SD_DET)
+ * (SD_CS) PA10 5 6 | PB4 (FREE) (MOSI) | 6 5 | (LCD_CS)
+ * (LCD_CS) PD2 | 7 8 | PB7 (FREE) (SD_CS) | 4 3 | (MOD_RESET)
+ * 5V | 9 10 | GND (SCK) | 2 1 | (MISO)
+ * ------ ------
+ * EXP1 EXP1
+ *
+ * Needs custom cable:
+ *
+ * Board Adapter Display
+ * _________
+ * EXP1-10 ---------- EXP1-10
+ * EXP1-9 ----------- EXP1-9
+ * SPI1-4 ----------- EXP1-6
+ * EXP1-7 ----------- EXP1-5
+ * SPI1-3 ----------- EXP1-2
+ * EXP1-5 ----------- EXP1-4
+ * EXP1-4 ----------- EXP1-8
+ * EXP1-3 ----------- EXP1-3
+ * SPI1-1 ----------- EXP1-1
+ * EXP1-1 ----------- EXP1-7
+ */
+
+ #define CLCD_SPI_BUS 1 // SPI1 connector
+
+ #define BEEPER_PIN EXP1_02_PIN
+
+ #define CLCD_MOD_RESET EXP1_03_PIN
+ #define CLCD_SPI_CS EXP1_07_PIN
+
+#endif // TOUCH_UI_FTDI_EVE && LCD_FYSETC_TFT81050
+
+//
+// SD Support
+//
+
+#ifndef SDCARD_CONNECTION
+ #define SDCARD_CONNECTION ONBOARD
+#endif
+
+#if SD_CONNECTION_IS(LCD) && (BOTH(TOUCH_UI_FTDI_EVE, LCD_FYSETC_TFT81050) || IS_TFTGLCD_PANEL)
+ #define SD_DETECT_PIN EXP1_01_PIN
+ #define SD_SS_PIN EXP1_05_PIN
+#elif SD_CONNECTION_IS(CUSTOM_CABLE)
+ #error "SD CUSTOM_CABLE is not compatible with SKR Mini E3."
+#endif
+
+#define ONBOARD_SPI_DEVICE 1 // SPI1 -> used only by HAL/STM32F1...
+#define ONBOARD_SD_CS_PIN PA4 // Chip select for "System" SD card
+
+#define ENABLE_SPI1
+#define SDSS ONBOARD_SD_CS_PIN
+#define SD_SS_PIN ONBOARD_SD_CS_PIN
+#define SD_SCK_PIN PA5
+#define SD_MISO_PIN PA6
+#define SD_MOSI_PIN PA7
diff --git a/buildroot/share/PlatformIO/boards/marlin_STM32F401RC.json b/buildroot/share/PlatformIO/boards/marlin_STM32F401RC.json
new file mode 100644
index 0000000000..f4242ccc00
--- /dev/null
+++ b/buildroot/share/PlatformIO/boards/marlin_STM32F401RC.json
@@ -0,0 +1,38 @@
+{
+ "build": {
+ "core": "stm32",
+ "cpu": "cortex-m4",
+ "extra_flags": "-DSTM32F401xC -DSTM32F4xx",
+ "f_cpu": "84000000L",
+ "mcu": "stm32f401rct6",
+ "product_line": "STM32F401xC",
+ "variant": "MARLIN_F401RC"
+ },
+ "debug": {
+ "jlink_device": "STM32F401RC",
+ "openocd_target": "stm32f4x",
+ "svd_path": "STM32F401x.svd"
+ },
+ "frameworks": [
+ "arduino",
+ "cmsis",
+ "spl",
+ "stm32cube",
+ "libopencm3"
+ ],
+ "name": "STM32F401RC (64k RAM. 256k Flash)",
+ "upload": {
+ "maximum_ram_size": 65536,
+ "maximum_size": 262144,
+ "protocol": "serial",
+ "protocols": [
+ "blackmagic",
+ "dfu",
+ "jlink",
+ "serial",
+ "stlink"
+ ]
+ },
+ "url": "https://www.st.com/en/microcontrollers-microprocessors/stm32f401rc.html",
+ "vendor": "Generic"
+}
diff --git a/buildroot/share/PlatformIO/variants/MARLIN_F401RC/PeripheralPins.c b/buildroot/share/PlatformIO/variants/MARLIN_F401RC/PeripheralPins.c
new file mode 100644
index 0000000000..b30ccf606b
--- /dev/null
+++ b/buildroot/share/PlatformIO/variants/MARLIN_F401RC/PeripheralPins.c
@@ -0,0 +1,256 @@
+/*
+ *******************************************************************************
+ * Copyright (c) 2020-2021, STMicroelectronics
+ * All rights reserved.
+ *
+ * This software component is licensed by ST under BSD 3-Clause license,
+ * the "License"; You may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at:
+ * opensource.org/licenses/BSD-3-Clause
+ *
+ *******************************************************************************
+ */
+/*
+ * Automatically generated from STM32F401R(B-C)Tx.xml, STM32F401R(D-E)Tx.xml
+ * CubeMX DB release 6.0.30
+ */
+#if !defined(CUSTOM_PERIPHERAL_PINS)
+#include "Arduino.h"
+#include "PeripheralPins.h"
+
+/* =====
+ * Notes:
+ * - The pins mentioned Px_y_ALTz are alternative possibilities which use other
+ * HW peripheral instances. You can use them the same way as any other "normal"
+ * pin (i.e. analogWrite(PA7_ALT1, 128);).
+ *
+ * - Commented lines are alternative possibilities which are not used per default.
+ * If you change them, you will have to know what you do
+ * =====
+ */
+
+//*** ADC ***
+
+#ifdef HAL_ADC_MODULE_ENABLED
+WEAK const PinMap PinMap_ADC[] = {
+ {PA_0, ADC1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 0, 0)}, // ADC1_IN0
+ {PA_1, ADC1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 1, 0)}, // ADC1_IN1
+ {PA_2, ADC1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 2, 0)}, // ADC1_IN2
+ {PA_3, ADC1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 3, 0)}, // ADC1_IN3
+ {PA_4, ADC1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 4, 0)}, // ADC1_IN4
+ {PA_5, ADC1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 5, 0)}, // ADC1_IN5
+ {PA_6, ADC1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 6, 0)}, // ADC1_IN6
+ {PA_7, ADC1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 7, 0)}, // ADC1_IN7
+ {PB_0, ADC1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 8, 0)}, // ADC1_IN8
+ {PB_1, ADC1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 9, 0)}, // ADC1_IN9
+ {PC_0, ADC1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 10, 0)}, // ADC1_IN10
+ {PC_1, ADC1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 11, 0)}, // ADC1_IN11
+ {PC_2, ADC1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 12, 0)}, // ADC1_IN12
+ {PC_3, ADC1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 13, 0)}, // ADC1_IN13
+ {PC_4, ADC1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 14, 0)}, // ADC1_IN14
+ {PC_5, ADC1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 15, 0)}, // ADC1_IN15
+ {NC, NP, 0}
+};
+#endif
+
+//*** No DAC ***
+
+//*** I2C ***
+
+#ifdef HAL_I2C_MODULE_ENABLED
+WEAK const PinMap PinMap_I2C_SDA[] = {
+ {PB_3, I2C2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF9_I2C2)},
+ {PB_4, I2C3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF9_I2C3)},
+ {PB_7, I2C1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
+ {PB_9, I2C1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
+ {PC_9, I2C3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)},
+ {NC, NP, 0}
+};
+#endif
+
+#ifdef HAL_I2C_MODULE_ENABLED
+WEAK const PinMap PinMap_I2C_SCL[] = {
+ {PA_8, I2C3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)},
+ {PB_6, I2C1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
+ {PB_8, I2C1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
+ {PB_10, I2C2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
+ {NC, NP, 0}
+};
+#endif
+
+//*** TIM ***
+
+#ifdef HAL_TIM_MODULE_ENABLED
+WEAK const PinMap PinMap_TIM[] = {
+ {PA_0, TIM2, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 1, 0)}, // TIM2_CH1
+ {PA_0_ALT1, TIM5, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM5, 1, 0)}, // TIM5_CH1
+ {PA_1, TIM2, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 2, 0)}, // TIM2_CH2
+ {PA_1_ALT1, TIM5, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM5, 2, 0)}, // TIM5_CH2
+ {PA_2, TIM2, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 3, 0)}, // TIM2_CH3
+ {PA_2_ALT1, TIM5, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM5, 3, 0)}, // TIM5_CH3
+ {PA_2_ALT2, TIM9, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM9, 1, 0)}, // TIM9_CH1
+ {PA_3, TIM2, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 4, 0)}, // TIM2_CH4
+ {PA_3_ALT1, TIM5, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM5, 4, 0)}, // TIM5_CH4
+ {PA_3_ALT2, TIM9, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM9, 2, 0)}, // TIM9_CH2
+ {PA_5, TIM2, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 1, 0)}, // TIM2_CH1
+ {PA_6, TIM3, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM3, 1, 0)}, // TIM3_CH1
+ {PA_7, TIM1, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM1, 1, 1)}, // TIM1_CH1N
+ {PA_7_ALT1, TIM3, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM3, 2, 0)}, // TIM3_CH2
+ {PA_8, TIM1, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM1, 1, 0)}, // TIM1_CH1
+ {PA_9, TIM1, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM1, 2, 0)}, // TIM1_CH2
+ {PA_10, TIM1, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM1, 3, 0)}, // TIM1_CH3
+ {PA_11, TIM1, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM1, 4, 0)}, // TIM1_CH4
+ {PA_15, TIM2, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 1, 0)}, // TIM2_CH1
+ {PB_0, TIM1, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM1, 2, 1)}, // TIM1_CH2N
+ {PB_0_ALT1, TIM3, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM3, 3, 0)}, // TIM3_CH3
+ {PB_1, TIM1, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM1, 3, 1)}, // TIM1_CH3N
+ {PB_1_ALT1, TIM3, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM3, 4, 0)}, // TIM3_CH4
+ {PB_3, TIM2, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 2, 0)}, // TIM2_CH2
+ {PB_4, TIM3, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM3, 1, 0)}, // TIM3_CH1
+ {PB_5, TIM3, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM3, 2, 0)}, // TIM3_CH2
+ {PB_6, TIM4, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM4, 1, 0)}, // TIM4_CH1
+ {PB_7, TIM4, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM4, 2, 0)}, // TIM4_CH2
+ {PB_8, TIM4, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM4, 3, 0)}, // TIM4_CH3
+ {PB_8_ALT1, TIM10, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM10, 1, 0)}, // TIM10_CH1
+ {PB_9, TIM4, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM4, 4, 0)}, // TIM4_CH4
+ {PB_9_ALT1, TIM11, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM11, 1, 0)}, // TIM11_CH1
+ {PB_10, TIM2, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 3, 0)}, // TIM2_CH3
+ {PB_13, TIM1, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM1, 1, 1)}, // TIM1_CH1N
+ {PB_14, TIM1, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM1, 2, 1)}, // TIM1_CH2N
+ {PB_15, TIM1, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM1, 3, 1)}, // TIM1_CH3N
+ {PC_6, TIM3, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM3, 1, 0)}, // TIM3_CH1
+ {PC_7, TIM3, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM3, 2, 0)}, // TIM3_CH2
+ {PC_8, TIM3, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM3, 3, 0)}, // TIM3_CH3
+ {PC_9, TIM3, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM3, 4, 0)}, // TIM3_CH4
+ {NC, NP, 0}
+};
+#endif
+
+//*** UART ***
+
+#ifdef HAL_UART_MODULE_ENABLED
+WEAK const PinMap PinMap_UART_TX[] = {
+ {PA_2, USART2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART2)},
+ {PA_9, USART1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)},
+ {PA_11, USART6, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_USART6)},
+ {PB_6, USART1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)},
+ {PC_6, USART6, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_USART6)},
+ {NC, NP, 0}
+};
+#endif
+
+#ifdef HAL_UART_MODULE_ENABLED
+WEAK const PinMap PinMap_UART_RX[] = {
+ {PA_3, USART2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART2)},
+ {PA_10, USART1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)},
+ {PA_12, USART6, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_USART6)},
+ {PB_7, USART1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)},
+ {PC_7, USART6, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_USART6)},
+ {NC, NP, 0}
+};
+#endif
+
+#ifdef HAL_UART_MODULE_ENABLED
+WEAK const PinMap PinMap_UART_RTS[] = {
+ {PA_1, USART2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART2)},
+ {PA_12, USART1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)},
+ {NC, NP, 0}
+};
+#endif
+
+#ifdef HAL_UART_MODULE_ENABLED
+WEAK const PinMap PinMap_UART_CTS[] = {
+ {PA_0, USART2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART2)},
+ {PA_11, USART1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)},
+ {NC, NP, 0}
+};
+#endif
+
+//*** SPI ***
+
+#ifdef HAL_SPI_MODULE_ENABLED
+WEAK const PinMap PinMap_SPI_MOSI[] = {
+ {PA_7, SPI1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
+ {PB_5, SPI1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
+ {PB_5_ALT1, SPI3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
+ {PB_15, SPI2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
+ {PC_3, SPI2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
+ {PC_12, SPI3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
+ {NC, NP, 0}
+};
+#endif
+
+#ifdef HAL_SPI_MODULE_ENABLED
+WEAK const PinMap PinMap_SPI_MISO[] = {
+ {PA_6, SPI1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
+ {PB_4, SPI1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
+ {PB_4_ALT1, SPI3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
+ {PB_14, SPI2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
+ {PC_2, SPI2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
+ {PC_11, SPI3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
+ {NC, NP, 0}
+};
+#endif
+
+#ifdef HAL_SPI_MODULE_ENABLED
+WEAK const PinMap PinMap_SPI_SCLK[] = {
+ {PA_5, SPI1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
+ {PB_3, SPI1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
+ {PB_3_ALT1, SPI3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
+ {PB_10, SPI2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
+ {PB_13, SPI2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
+ {PC_10, SPI3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
+ {NC, NP, 0}
+};
+#endif
+
+#ifdef HAL_SPI_MODULE_ENABLED
+WEAK const PinMap PinMap_SPI_SSEL[] = {
+ {PA_4, SPI1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
+ {PA_4_ALT1, SPI3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
+ {PA_15, SPI1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
+ {PA_15_ALT1, SPI3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
+ {PB_9, SPI2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
+ {PB_12, SPI2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
+ {NC, NP, 0}
+};
+#endif
+
+//*** No CAN ***
+
+//*** No ETHERNET ***
+
+//*** No QUADSPI ***
+
+//*** USB ***
+
+#if defined(HAL_PCD_MODULE_ENABLED) || defined(HAL_HCD_MODULE_ENABLED)
+WEAK const PinMap PinMap_USB_OTG_FS[] = {
+ {PA_8, USB_OTG_FS, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF10_OTG_FS)}, // USB_OTG_FS_SOF
+ {PA_9, USB_OTG_FS, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, GPIO_AF_NONE)}, // USB_OTG_FS_VBUS
+ {PA_10, USB_OTG_FS, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_PULLUP, GPIO_AF10_OTG_FS)}, // USB_OTG_FS_ID
+ {PA_11, USB_OTG_FS, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF10_OTG_FS)}, // USB_OTG_FS_DM
+ {PA_12, USB_OTG_FS, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF10_OTG_FS)}, // USB_OTG_FS_DP
+ {NC, NP, 0}
+};
+#endif
+
+//*** SD ***
+
+#ifdef HAL_SD_MODULE_ENABLED
+WEAK const PinMap PinMap_SD[] = {
+ {PB_8, SDIO, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF12_SDIO)}, // SDIO_D4
+ {PB_9, SDIO, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF12_SDIO)}, // SDIO_D5
+ {PC_6, SDIO, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF12_SDIO)}, // SDIO_D6
+ {PC_7, SDIO, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF12_SDIO)}, // SDIO_D7
+ {PC_8, SDIO, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF12_SDIO)}, // SDIO_D0
+ {PC_9, SDIO, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF12_SDIO)}, // SDIO_D1
+ {PC_10, SDIO, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF12_SDIO)}, // SDIO_D2
+ {PC_11, SDIO, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF12_SDIO)}, // SDIO_D3
+ {PC_12, SDIO, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_NOPULL, GPIO_AF12_SDIO)}, // SDIO_CK
+ {PD_2, SDIO, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_NOPULL, GPIO_AF12_SDIO)}, // SDIO_CMD
+ {NC, NP, 0}
+};
+#endif
+
+#endif /* !CUSTOM_PERIPHERAL_PINS */
diff --git a/buildroot/share/PlatformIO/variants/MARLIN_F401RC/PinNamesVar.h b/buildroot/share/PlatformIO/variants/MARLIN_F401RC/PinNamesVar.h
new file mode 100644
index 0000000000..766cc2ca26
--- /dev/null
+++ b/buildroot/share/PlatformIO/variants/MARLIN_F401RC/PinNamesVar.h
@@ -0,0 +1,52 @@
+/* Alternate pin name */
+PA_0_ALT1 = PA_0 | ALT1,
+PA_1_ALT1 = PA_1 | ALT1,
+PA_2_ALT1 = PA_2 | ALT1,
+PA_2_ALT2 = PA_2 | ALT2,
+PA_3_ALT1 = PA_3 | ALT1,
+PA_3_ALT2 = PA_3 | ALT2,
+PA_4_ALT1 = PA_4 | ALT1,
+PA_7_ALT1 = PA_7 | ALT1,
+PA_15_ALT1 = PA_15 | ALT1,
+PB_0_ALT1 = PB_0 | ALT1,
+PB_1_ALT1 = PB_1 | ALT1,
+PB_3_ALT1 = PB_3 | ALT1,
+PB_4_ALT1 = PB_4 | ALT1,
+PB_5_ALT1 = PB_5 | ALT1,
+PB_8_ALT1 = PB_8 | ALT1,
+PB_9_ALT1 = PB_9 | ALT1,
+
+/* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+ SYS_WKUP1 = PA_0,
+#endif
+#ifdef PWR_WAKEUP_PIN2
+ SYS_WKUP2 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN3
+ SYS_WKUP3 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN4
+ SYS_WKUP4 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+ SYS_WKUP5 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN6
+ SYS_WKUP6 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+ SYS_WKUP7 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+ SYS_WKUP8 = NC,
+#endif
+
+/* USB */
+#ifdef USBCON
+ USB_OTG_FS_DM = PA_11,
+ USB_OTG_FS_DP = PA_12,
+ USB_OTG_FS_ID = PA_10,
+ USB_OTG_FS_SOF = PA_8,
+ USB_OTG_FS_VBUS = PA_9,
+#endif
diff --git a/buildroot/share/PlatformIO/variants/MARLIN_F401RC/ldscript.ld b/buildroot/share/PlatformIO/variants/MARLIN_F401RC/ldscript.ld
new file mode 100644
index 0000000000..a0ab41f631
--- /dev/null
+++ b/buildroot/share/PlatformIO/variants/MARLIN_F401RC/ldscript.ld
@@ -0,0 +1,177 @@
+/**
+ ******************************************************************************
+ * @file LinkerScript.ld
+ * @author Auto-generated by STM32CubeIDE
+ * @brief Linker script for STM32F401RBTx Device from STM32F4 series
+ * 128Kbytes FLASH
+ * 64Kbytes RAM
+ *
+ * Set heap size, stack size and stack location according
+ * to application requirements.
+ *
+ * Set memory bank area and size if external memory is used
+ ******************************************************************************
+ * @attention
+ *
+ * © Copyright (c) 2020 STMicroelectronics.
+ * All rights reserved.
+ *
+ * This software component is licensed by ST under BSD 3-Clause license,
+ * the "License"; You may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at:
+ * opensource.org/licenses/BSD-3-Clause
+ *
+ ******************************************************************************
+ */
+
+/* Entry Point */
+ENTRY(Reset_Handler)
+
+/* Highest address of the user mode stack */
+_estack = ORIGIN(RAM) + LENGTH(RAM); /* end of "RAM" Ram type memory */
+
+_Min_Heap_Size = 0x200; /* required amount of heap */
+_Min_Stack_Size = 0x400; /* required amount of stack */
+
+/* Memories definition */
+MEMORY
+{
+ RAM (xrw) : ORIGIN = 0x20000000, LENGTH = LD_MAX_DATA_SIZE
+ FLASH (rx) : ORIGIN = 0x8000000 + LD_FLASH_OFFSET, LENGTH = LD_MAX_SIZE - LD_FLASH_OFFSET
+}
+
+/* Sections */
+SECTIONS
+{
+ /* The startup code into "FLASH" Rom type memory */
+ .isr_vector :
+ {
+ . = ALIGN(4);
+ KEEP(*(.isr_vector)) /* Startup code */
+ . = ALIGN(4);
+ } >FLASH
+
+ /* The program code and other data into "FLASH" Rom type memory */
+ .text :
+ {
+ . = ALIGN(4);
+ *(.text) /* .text sections (code) */
+ *(.text*) /* .text* sections (code) */
+ *(.glue_7) /* glue arm to thumb code */
+ *(.glue_7t) /* glue thumb to arm code */
+ *(.eh_frame)
+
+ KEEP (*(.init))
+ KEEP (*(.fini))
+
+ . = ALIGN(4);
+ _etext = .; /* define a global symbols at end of code */
+ } >FLASH
+
+ /* Constant data into "FLASH" Rom type memory */
+ .rodata :
+ {
+ . = ALIGN(4);
+ *(.rodata) /* .rodata sections (constants, strings, etc.) */
+ *(.rodata*) /* .rodata* sections (constants, strings, etc.) */
+ . = ALIGN(4);
+ } >FLASH
+
+ .ARM.extab : {
+ . = ALIGN(4);
+ *(.ARM.extab* .gnu.linkonce.armextab.*)
+ . = ALIGN(4);
+ } >FLASH
+
+ .ARM : {
+ . = ALIGN(4);
+ __exidx_start = .;
+ *(.ARM.exidx*)
+ __exidx_end = .;
+ . = ALIGN(4);
+ } >FLASH
+
+ .preinit_array :
+ {
+ . = ALIGN(4);
+ PROVIDE_HIDDEN (__preinit_array_start = .);
+ KEEP (*(.preinit_array*))
+ PROVIDE_HIDDEN (__preinit_array_end = .);
+ . = ALIGN(4);
+ } >FLASH
+
+ .init_array :
+ {
+ . = ALIGN(4);
+ PROVIDE_HIDDEN (__init_array_start = .);
+ KEEP (*(SORT(.init_array.*)))
+ KEEP (*(.init_array*))
+ PROVIDE_HIDDEN (__init_array_end = .);
+ . = ALIGN(4);
+ } >FLASH
+
+ .fini_array :
+ {
+ . = ALIGN(4);
+ PROVIDE_HIDDEN (__fini_array_start = .);
+ KEEP (*(SORT(.fini_array.*)))
+ KEEP (*(.fini_array*))
+ PROVIDE_HIDDEN (__fini_array_end = .);
+ . = ALIGN(4);
+ } >FLASH
+
+ /* Used by the startup to initialize data */
+ _sidata = LOADADDR(.data);
+
+ /* Initialized data sections into "RAM" Ram type memory */
+ .data :
+ {
+ . = ALIGN(4);
+ _sdata = .; /* create a global symbol at data start */
+ *(.data) /* .data sections */
+ *(.data*) /* .data* sections */
+ *(.RamFunc) /* .RamFunc sections */
+ *(.RamFunc*) /* .RamFunc* sections */
+
+ . = ALIGN(4);
+ _edata = .; /* define a global symbol at data end */
+
+ } >RAM AT> FLASH
+
+ /* Uninitialized data section into "RAM" Ram type memory */
+ . = ALIGN(4);
+ .bss :
+ {
+ /* This is used by the startup in order to initialize the .bss section */
+ _sbss = .; /* define a global symbol at bss start */
+ __bss_start__ = _sbss;
+ *(.bss)
+ *(.bss*)
+ *(COMMON)
+
+ . = ALIGN(4);
+ _ebss = .; /* define a global symbol at bss end */
+ __bss_end__ = _ebss;
+ } >RAM
+
+ /* User_heap_stack section, used to check that there is enough "RAM" Ram type memory left */
+ ._user_heap_stack :
+ {
+ . = ALIGN(8);
+ PROVIDE ( end = . );
+ PROVIDE ( _end = . );
+ . = . + _Min_Heap_Size;
+ . = . + _Min_Stack_Size;
+ . = ALIGN(8);
+ } >RAM
+
+ /* Remove information from the compiler libraries */
+ /DISCARD/ :
+ {
+ libc.a ( * )
+ libm.a ( * )
+ libgcc.a ( * )
+ }
+
+ .ARM.attributes 0 : { *(.ARM.attributes) }
+}
diff --git a/buildroot/share/PlatformIO/variants/MARLIN_F401RC/variant_MARLIN_STM32F401RC.cpp b/buildroot/share/PlatformIO/variants/MARLIN_F401RC/variant_MARLIN_STM32F401RC.cpp
new file mode 100644
index 0000000000..aac11b0b66
--- /dev/null
+++ b/buildroot/share/PlatformIO/variants/MARLIN_F401RC/variant_MARLIN_STM32F401RC.cpp
@@ -0,0 +1,223 @@
+/*
+ *******************************************************************************
+ * Copyright (c) 2020-2021, STMicroelectronics
+ * All rights reserved.
+ *
+ * This software component is licensed by ST under BSD 3-Clause license,
+ * the "License"; You may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at:
+ * opensource.org/licenses/BSD-3-Clause
+ *
+ *******************************************************************************
+ */
+
+#if defined(STM32F401xC)
+#include "pins_arduino.h"
+
+// Digital PinName array
+const PinName digitalPin[] = {
+ PA_0, // D0/A0
+ PA_1, // D1/A1
+ PA_2, // D2/A2
+ PA_3, // D3/A3
+ PA_4, // D4/A4
+ PA_5, // D5/A5
+ PA_6, // D6/A6
+ PA_7, // D7/A7
+ PA_8, // D8
+ PA_9, // D9
+ PA_10, // D10
+ PA_11, // D11
+ PA_12, // D12
+ PA_13, // D13
+ PA_14, // D14
+ PA_15, // D15
+ PB_0, // D16/A8
+ PB_1, // D17/A9
+ PB_2, // D18
+ PB_3, // D19
+ PB_4, // D20
+ PB_5, // D21
+ PB_6, // D22
+ PB_7, // D23
+ PB_8, // D24
+ PB_9, // D25
+ PB_10, // D26
+ PB_12, // D27
+ PB_13, // D28
+ PB_14, // D29
+ PB_15, // D30
+ PC_0, // D31/A10
+ PC_1, // D32/A11
+ PC_2, // D33/A12
+ PC_3, // D34/A13
+ PC_4, // D35/A14
+ PC_5, // D36/A15
+ PC_6, // D37
+ PC_7, // D38
+ PC_8, // D39
+ PC_9, // D40
+ PC_10, // D41
+ PC_11, // D42
+ PC_12, // D43
+ PC_13, // D44
+ PC_14, // D45
+ PC_15, // D46
+ PD_2, // D47
+ PH_0, // D48
+ PH_1 // D49
+};
+
+// Analog (Ax) pin number array
+const uint32_t analogInputPin[] = {
+ 0, // A0, PA0
+ 1, // A1, PA1
+ 2, // A2, PA2
+ 3, // A3, PA3
+ 4, // A4, PA4
+ 5, // A5, PA5
+ 6, // A6, PA6
+ 7, // A7, PA7
+ 16, // A8, PB0
+ 17, // A9, PB1
+ 31, // A10, PC0
+ 32, // A11, PC1
+ 33, // A12, PC2
+ 34, // A13, PC3
+ 35, // A14, PC4
+ 36 // A15, PC5
+};
+
+// ----------------------------------------------------------------------------
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * @brief Configures the System clock source, PLL Multiplier and Divider factors,
+ * AHB/APBx prescalers and Flash settings
+ * @note This function should be called only once the RCC clock configuration
+ * is reset to the default reset state (done in SystemInit() function).
+ * @param None
+ * @retval None
+ */
+
+/******************************************************************************/
+/* PLL (clocked by HSE) used as System clock source */
+/******************************************************************************/
+static uint8_t SetSysClock_PLL_HSE(uint8_t bypass)
+{
+ RCC_OscInitTypeDef RCC_OscInitStruct;
+ RCC_ClkInitTypeDef RCC_ClkInitStruct;
+
+ /* The voltage scaling allows optimizing the power consumption when the device is
+ clocked below the maximum system frequency, to update the voltage scaling value
+ regarding system frequency refer to product datasheet. */
+ __HAL_RCC_PWR_CLK_ENABLE();
+ __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);
+
+ // Enable HSE oscillator and activate PLL with HSE as source
+ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
+ if (bypass == 0) {
+ RCC_OscInitStruct.HSEState = RCC_HSE_ON; // External 8 MHz xtal on OSC_IN/OSC_OUT
+ } else {
+ RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS; // External 8 MHz clock on OSC_IN
+ }
+
+ RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+ RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+ RCC_OscInitStruct.PLL.PLLM = HSE_VALUE / 1000000L; // Expects an 8 MHz external clock by default. Redefine HSE_VALUE if not
+ RCC_OscInitStruct.PLL.PLLN = 336; // VCO output clock = 336 MHz (1 MHz * 336)
+ RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4; // PLLCLK = 84 MHz (336 MHz / 4)
+ RCC_OscInitStruct.PLL.PLLQ = 7; // USB clock = 48 MHz (336 MHz / 7) --> OK for USB
+ if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
+ return 0; // FAIL
+ }
+
+ // Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers
+ RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
+ RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; // 84 MHz
+ RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; // 84 MHz
+ RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2; // 42 MHz
+ RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; // 84 MHz
+ if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK) {
+ return 0; // FAIL
+ }
+
+ /* Output clock on MCO1 pin(PA8) for debugging purpose */
+ /*
+ if (bypass == 0)
+ HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_HSE, RCC_MCODIV_2); // 4 MHz
+ else
+ HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_HSE, RCC_MCODIV_1); // 8 MHz
+ */
+
+ return 1; // OK
+}
+
+/******************************************************************************/
+/* PLL (clocked by HSI) used as System clock source */
+/******************************************************************************/
+uint8_t SetSysClock_PLL_HSI(void)
+{
+ RCC_OscInitTypeDef RCC_OscInitStruct;
+ RCC_ClkInitTypeDef RCC_ClkInitStruct;
+
+ /* The voltage scaling allows optimizing the power consumption when the device is
+ clocked below the maximum system frequency, to update the voltage scaling value
+ regarding system frequency refer to product datasheet. */
+ __HAL_RCC_PWR_CLK_ENABLE();
+ __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);
+
+ // Enable HSI oscillator and activate PLL with HSI as source
+ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI | RCC_OSCILLATORTYPE_HSE;
+ RCC_OscInitStruct.HSIState = RCC_HSI_ON;
+ RCC_OscInitStruct.HSEState = RCC_HSE_OFF;
+ RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
+ RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+ RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
+ RCC_OscInitStruct.PLL.PLLM = 16; // VCO input clock = 1 MHz (16 MHz / 16)
+ RCC_OscInitStruct.PLL.PLLN = 336; // VCO output clock = 336 MHz (1 MHz * 336)
+ RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4; // PLLCLK = 84 MHz (336 MHz / 4)
+ RCC_OscInitStruct.PLL.PLLQ = 7; // USB clock = 48 MHz (336 MHz / 7) --> freq is ok but not precise enough
+ if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
+ return 0; // FAIL
+ }
+
+ /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
+ RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+ RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; // 84 MHz
+ RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; // 84 MHz
+ RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2; // 42 MHz
+ RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; // 84 MHz
+ if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK) {
+ return 0; // FAIL
+ }
+
+ /* Output clock on MCO1 pin(PA8) for debugging purpose */
+ //HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_HSI, RCC_MCODIV_1); // 16 MHz
+
+ return 1; // OK
+}
+
+WEAK void SystemClock_Config(void)
+{
+ /* 1- If fail try to start with HSE and external xtal */
+ if (SetSysClock_PLL_HSE(0) == 0) {
+ /* 2- Try to start with HSE and external clock */
+ if (SetSysClock_PLL_HSE(1) == 0) {
+ /* 3- If fail start with HSI clock */
+ if (SetSysClock_PLL_HSI() == 0) {
+ Error_Handler();
+ }
+ }
+ }
+ /* Output clock on MCO2 pin(PC9) for debugging purpose */
+ //HAL_RCC_MCOConfig(RCC_MCO2, RCC_MCO2SOURCE_SYSCLK, RCC_MCODIV_4);
+}
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* STM32F401xC */
\ No newline at end of file
diff --git a/buildroot/share/PlatformIO/variants/MARLIN_F401RC/variant_MARLIN_STM32F401RC.h b/buildroot/share/PlatformIO/variants/MARLIN_F401RC/variant_MARLIN_STM32F401RC.h
new file mode 100644
index 0000000000..37d60d9306
--- /dev/null
+++ b/buildroot/share/PlatformIO/variants/MARLIN_F401RC/variant_MARLIN_STM32F401RC.h
@@ -0,0 +1,186 @@
+/*
+ *******************************************************************************
+ * Copyright (c) 2020-2021, STMicroelectronics
+ * All rights reserved.
+ *
+ * This software component is licensed by ST under BSD 3-Clause license,
+ * the "License"; You may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at:
+ * opensource.org/licenses/BSD-3-Clause
+ *
+ *******************************************************************************
+ */
+#pragma once
+
+/*----------------------------------------------------------------------------
+ * STM32 pins number
+ *----------------------------------------------------------------------------*/
+#define PA0 PIN_A0
+#define PA1 PIN_A1
+#define PA2 PIN_A2
+#define PA3 PIN_A3
+#define PA4 PIN_A4
+#define PA5 PIN_A5
+#define PA6 PIN_A6
+#define PA7 PIN_A7
+#define PA8 8
+#define PA9 9
+#define PA10 10
+#define PA11 11
+#define PA12 12
+#define PA13 13
+#define PA14 14
+#define PA15 15
+#define PB0 PIN_A8
+#define PB1 PIN_A9
+#define PB2 18
+#define PB3 19
+#define PB4 20
+#define PB5 21
+#define PB6 22
+#define PB7 23
+#define PB8 24
+#define PB9 25
+#define PB10 26
+#define PB12 27
+#define PB13 28
+#define PB14 29
+#define PB15 30
+#define PC0 PIN_A10
+#define PC1 PIN_A11
+#define PC2 PIN_A12
+#define PC3 PIN_A13
+#define PC4 PIN_A14
+#define PC5 PIN_A15
+#define PC6 37
+#define PC7 38
+#define PC8 39
+#define PC9 40
+#define PC10 41
+#define PC11 42
+#define PC12 43
+#define PC13 44
+#define PC14 45
+#define PC15 46
+#define PD2 47
+#define PH0 48
+#define PH1 49
+
+// Alternate pins number
+#define PA0_ALT1 (PA0 | ALT1)
+#define PA1_ALT1 (PA1 | ALT1)
+#define PA2_ALT1 (PA2 | ALT1)
+#define PA2_ALT2 (PA2 | ALT2)
+#define PA3_ALT1 (PA3 | ALT1)
+#define PA3_ALT2 (PA3 | ALT2)
+#define PA4_ALT1 (PA4 | ALT1)
+#define PA7_ALT1 (PA7 | ALT1)
+#define PA15_ALT1 (PA15 | ALT1)
+#define PB0_ALT1 (PB0 | ALT1)
+#define PB1_ALT1 (PB1 | ALT1)
+#define PB3_ALT1 (PB3 | ALT1)
+#define PB4_ALT1 (PB4 | ALT1)
+#define PB5_ALT1 (PB5 | ALT1)
+#define PB8_ALT1 (PB8 | ALT1)
+#define PB9_ALT1 (PB9 | ALT1)
+
+#define NUM_DIGITAL_PINS 50
+#define NUM_ANALOG_INPUTS 16
+#define NUM_ANALOG_FIRST 192
+
+// On-board LED pin number
+#ifndef LED_BUILTIN
+ #define LED_BUILTIN PNUM_NOT_DEFINED
+#endif
+
+// On-board user button
+#ifndef USER_BTN
+ #define USER_BTN PNUM_NOT_DEFINED
+#endif
+
+// SPI definitions
+#ifndef PIN_SPI_SS
+ #define PIN_SPI_SS PA4
+#endif
+#ifndef PIN_SPI_SS1
+ #define PIN_SPI_SS1 PA15
+#endif
+#ifndef PIN_SPI_SS2
+ #define PIN_SPI_SS2 PNUM_NOT_DEFINED
+#endif
+#ifndef PIN_SPI_SS3
+ #define PIN_SPI_SS3 PNUM_NOT_DEFINED
+#endif
+#ifndef PIN_SPI_MOSI
+ #define PIN_SPI_MOSI PA7
+#endif
+#ifndef PIN_SPI_MISO
+ #define PIN_SPI_MISO PA6
+#endif
+#ifndef PIN_SPI_SCK
+ #define PIN_SPI_SCK PA5
+#endif
+
+// I2C definitions
+#ifndef PIN_WIRE_SDA
+ #define PIN_WIRE_SDA PB3
+#endif
+#ifndef PIN_WIRE_SCL
+ #define PIN_WIRE_SCL PB10
+#endif
+
+// Timer Definitions
+// Use TIM6/TIM7 when possible as servo and tone don't need GPIO output pin
+#ifndef TIMER_TONE
+ #define TIMER_TONE TIM10
+#endif
+#ifndef TIMER_SERVO
+ #define TIMER_SERVO TIM11
+#endif
+
+// UART Definitions
+#ifndef SERIAL_UART_INSTANCE
+ #define SERIAL_UART_INSTANCE 2
+#endif
+
+// Default pin used for generic 'Serial' instance
+// Mandatory for Firmata
+#ifndef PIN_SERIAL_RX
+ #define PIN_SERIAL_RX PA3
+#endif
+#ifndef PIN_SERIAL_TX
+ #define PIN_SERIAL_TX PA2
+#endif
+
+// Extra HAL modules
+#if !defined(HAL_SD_MODULE_DISABLED)
+ #define HAL_SD_MODULE_ENABLED
+#endif
+
+/*----------------------------------------------------------------------------
+ * Arduino objects - C++ only
+ *----------------------------------------------------------------------------*/
+
+#ifdef __cplusplus
+ // These serial port names are intended to allow libraries and architecture-neutral
+ // sketches to automatically default to the correct port name for a particular type
+ // of use. For example, a GPS module would normally connect to SERIAL_PORT_HARDWARE_OPEN,
+ // the first hardware serial port whose RX/TX pins are not dedicated to another use.
+ //
+ // SERIAL_PORT_MONITOR Port which normally prints to the Arduino Serial Monitor
+ //
+ // SERIAL_PORT_USBVIRTUAL Port which is USB virtual serial
+ //
+ // SERIAL_PORT_LINUXBRIDGE Port which connects to a Linux system via Bridge library
+ //
+ // SERIAL_PORT_HARDWARE Hardware serial port, physical RX & TX pins.
+ //
+ // SERIAL_PORT_HARDWARE_OPEN Hardware serial ports which are open for use. Their RX & TX
+ // pins are NOT connected to anything by default.
+ #ifndef SERIAL_PORT_MONITOR
+ #define SERIAL_PORT_MONITOR Serial
+ #endif
+ #ifndef SERIAL_PORT_HARDWARE
+ #define SERIAL_PORT_HARDWARE Serial
+ #endif
+#endif
diff --git a/ini/stm32f4.ini b/ini/stm32f4.ini
index 2c5aedbfe0..39ceb8079d 100644
--- a/ini/stm32f4.ini
+++ b/ini/stm32f4.ini
@@ -656,3 +656,21 @@ upload_protocol = jlink
extends = env:STM32F401RC_creality
debug_tool = stlink
upload_protocol = stlink
+
+#
+# BigTree SKR mini E3 V3.0.1 (STM32F401RCT6 ARM Cortex-M4)
+#
+[env:STM32F401RC_btt]
+extends = stm32_variant
+platform = ststm32@~14.1.0
+platform_packages = framework-arduinoststm32@https://github.com/stm32duino/Arduino_Core_STM32/archive/main.zip
+board = marlin_STM32F401RC
+board_build.offset = 0x4000
+board_upload.offset_address = 0x08004000
+build_flags = ${stm32_variant.build_flags}
+ -DPIN_SERIAL6_RX=PC_7 -DPIN_SERIAL6_TX=PC_6
+ -DSERIAL_RX_BUFFER_SIZE=1024 -DSERIAL_TX_BUFFER_SIZE=1024
+ -DTIMER_SERVO=TIM3 -DTIMER_TONE=TIM4
+ -DSTEP_TIMER_IRQ_PRIO=0
+upload_protocol = stlink
+debug_tool = stlink