Support for BTT SKR Mini E3 v1.2 (#15476)

Marlin/src/core/boards.h

@@ -268,11 +268,12 @@
 #define BOARD_BIGTREE_SKR_MINI_V1_1   4010  // BigTreeTech SKR Mini v1.1 (STM32F103RC)
 #define BOARD_BIGTREE_SKR_MINI_E3     4011  // BigTreeTech SKR Mini E3 (STM32F103RC)
 #define BOARD_BIGTREE_SKR_E3_DIP      4012  // BigTreeTech SKR E3 DIP V1.0 (STM32F103RC)
-#define BOARD_JGAURORA_A5S_A1         4013  // JGAurora A5S A1 (STM32F103ZET6)
-#define BOARD_FYSETC_AIO_II           4014  // FYSETC AIO_II
-#define BOARD_FYSETC_CHEETAH          4015  // FYSETC Cheetah
-#define BOARD_FYSETC_CHEETAH_V12      4016  // FYSETC Cheetah V1.2
-#define BOARD_LONGER3D_LK             4017  // Alfawise U20/U20+/U30 (Longer3D LK1/2) / STM32F103VET6
+#define BOARD_BTT_SKR_MINI_E3_V1_2    4013  // BigTreeTech SKR Mini E3 V1.2 (STM32F103RC)
+#define BOARD_JGAURORA_A5S_A1         4014  // JGAurora A5S A1 (STM32F103ZET6)
+#define BOARD_FYSETC_AIO_II           4015  // FYSETC AIO_II
+#define BOARD_FYSETC_CHEETAH          4016  // FYSETC Cheetah
+#define BOARD_FYSETC_CHEETAH_V12      4017  // FYSETC Cheetah V1.2
+#define BOARD_LONGER3D_LK             4018  // Alfawise U20/U20+/U30 (Longer3D LK1/2) / STM32F103VET6
 
 //
 // ARM Cortex-M4F

Marlin/src/pins/pins.h

@@ -464,6 +464,8 @@
   #include "stm32/pins_MKS_ROBIN_LITE.h"        // STM32F1                                env:mks_robin_lite
 #elif MB(BIGTREE_SKR_MINI_V1_1)
   #include "stm32/pins_BIGTREE_SKR_MINI_V1_1.h" // STM32F1                                env:STM32F103RC_bigtree
+#elif MB(BTT_SKR_MINI_E3_V1_2)
+  #include "stm32/pins_BTT_SKR_MINI_E3_V1_2.h"  // STM32F1                                env:STM32F103RC_bigtree
 #elif MB(BIGTREE_SKR_MINI_E3)
   #include "stm32/pins_BIGTREE_SKR_MINI_E3.h"   // STM32F1                                env:STM32F103RC_bigtree
 #elif MB(BIGTREE_SKR_E3_DIP)

Marlin/src/pins/stm32/pins_BTT_SKR_MINI_E3_V1_2.h

@@ -0,0 +1,167 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2019 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 <http://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+#ifndef TARGET_STM32F1
+  #error "Oops! Select an STM32F1 board in 'Tools > Board.'"
+#endif
+
+#define BOARD_INFO_NAME "BIGTREE SKR Mini E3 V1.2"
+
+// Release PB3/PB4 (E0 STP/DIR) from JTAG pins
+#define DISABLE_JTAG
+
+// Ignore temp readings during development.
+//#define BOGUS_TEMPERATURE_GRACE_PERIOD 2000
+
+#define FLASH_EEPROM_EMULATION
+#define EEPROM_PAGE_SIZE     uint16(0x800) // 2KB
+#define EEPROM_START_ADDRESS uint32(0x8000000 + 256 * 1024 - 2 * EEPROM_PAGE_SIZE)
+#undef E2END
+#define E2END                (EEPROM_PAGE_SIZE - 1) // 2KB
+
+//
+// Servos
+//
+#define SERVO0_PIN         PA1
+
+//
+// Limit Switches
+//
+#define X_STOP_PIN         PC0
+#define Y_STOP_PIN         PC1
+#define Z_STOP_PIN         PC2
+
+//
+// Z Probe must be this pins
+//
+#define Z_MIN_PROBE_PIN    PC14
+
+//
+// Filament Runout Sensor
+//
+#ifndef FIL_RUNOUT_PIN
+  #define FIL_RUNOUT_PIN   PC12
+#endif
+
+//
+// Steppers
+//
+#define X_ENABLE_PIN       PB14
+#define X_STEP_PIN         PB13
+#define X_DIR_PIN          PB12
+
+#define Y_ENABLE_PIN       PB11
+#define Y_STEP_PIN         PB10
+#define Y_DIR_PIN          PB2
+
+#define Z_ENABLE_PIN       PB1
+#define Z_STEP_PIN         PB0
+#define Z_DIR_PIN          PC5
+
+#define E0_ENABLE_PIN      PD2
+#define E0_STEP_PIN        PB3
+#define E0_DIR_PIN         PB4
+
+#if HAS_TMC220x
+  /**
+   * TMC2208/TMC2209 stepper drivers
+   */
+  //
+  // Software serial
+  //
+  #define X_SERIAL_TX_PIN  PB15
+  #define X_SERIAL_RX_PIN  PB15
+
+  #define Y_SERIAL_TX_PIN  PC6
+  #define Y_SERIAL_RX_PIN  PC6
+
+  #define Z_SERIAL_TX_PIN  PC10
+  #define Z_SERIAL_RX_PIN  PC10
+
+  #define E0_SERIAL_TX_PIN PC11
+  #define E0_SERIAL_RX_PIN PC11
+#endif
+
+//
+// Temperature Sensors
+//
+#define TEMP_0_PIN         PA0   // Analog Input
+#define TEMP_BED_PIN       PC3   // Analog Input
+
+//
+// Heaters / Fans
+//
+#define HEATER_0_PIN       PC8   // EXTRUDER
+#define HEATER_BED_PIN     PC9   // BED
+#define FAN_PIN            PA8
+
+//
+// USB connect control
+//
+#define USB_CONNECT_PIN    PC13
+#define USB_CONNECT_INVERTING false
+
+#define NEOPIXEL_PIN       PC7  // LED driving pin
+
+#define SD_DETECT_PIN      PC4
+
+/**
+ *                 _____
+ *             5V | · · | GND
+ *  (LCD_EN) PB7  | · · | PB8  (LCD_RS)
+ *  (LCD_D4) PB9  | · · | PA10 (BTN_EN2)
+ *          RESET | · · | PA9  (BTN_EN1)
+ * (BTN_ENC) PB6  | · · | PB5  (BEEPER)
+ *                 -----
+ *                 EXP1
+ */
+#if HAS_SPI_LCD
+  #define BEEPER_PIN       PB5
+  #define BTN_ENC          PB6
+
+  #if ENABLED(CR10_STOCKDISPLAY)
+    #define LCD_PINS_RS    PB8
+
+    #define BTN_EN1        PA9
+    #define BTN_EN2        PA10
+
+    #define LCD_PINS_ENABLE PB7
+    #define LCD_PINS_D4    PB9
+
+  #else
+    #error "Only CR10_STOCKDISPLAY is currently supported on the BIGTREE_SKR_MINI_E3 V1.2."
+  #endif
+
+#endif // HAS_SPI_LCD
+
+//
+// SD Support
+//
+#define HAS_ONBOARD_SD
+
+#ifndef SDCARD_CONNECTION
+  #define SDCARD_CONNECTION ONBOARD
+#endif
+
+#define ON_BOARD_SPI_DEVICE 1    //SPI1
+#define ONBOARD_SD_CS_PIN  PA4   // Chip select for "System" SD card