MKS Robin Nano board support (#14363)

Marlin/src/core/boards.h

@@ -249,6 +249,7 @@
 #define BOARD_MORPHEUS                1806  // STM32F103C8/STM32F103CB Libmaple based stm32f1 controller
 #define BOARD_MKS_ROBIN               1808  // MKS Robin / STM32F103ZET6
 #define BOARD_MKS_ROBIN_MINI          1813  // MKS Robin Mini / STM32F103VET6
+#define BOARD_MKS_ROBIN_NANO          1812  // MKS Robin Nano / STM32F103VET6
 #define BOARD_BIGTREE_SKR_MINI_V1_1   1814  // STM32F103RC
 #define BOARD_JGAURORA_A5S_A1         1820  // JGAurora A5S A1 / STM32F103ZET6
 #define BOARD_FYSETC_AIO_II           1890  // FYSETC AIO_II

Marlin/src/pins/pins.h

@@ -434,6 +434,8 @@
   #include "pins_MKS_ROBIN.h"         // STM32F1                                    env:mks_robin
 #elif MB(MKS_ROBIN_MINI)
   #include "pins_MKS_ROBIN_MINI.h"    // STM32F1                                    env:mks_robin_mini
+#elif MB(MKS_ROBIN_NANO)
+  #include "pins_MKS_ROBIN_NANO.h"    // STM32F1                                    env:mks_robin_nano
 #elif MB(JGAURORA_A5S_A1)
   #include "pins_JGAURORA_A5S_A1.h"   // STM32F1                                    env:JGAURORA_A5S_A1
 #elif MB(FYSETC_AIO_II)

Marlin/src/pins/pins_MKS_ROBIN_NANO.h

@@ -0,0 +1,118 @@
+/**
+ * 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/>.
+ *
+ */
+
+/**
+ * MKS Robin nano (STM32F130VET6) board pin assignments
+ */
+
+#ifndef __STM32F1__
+  #error "Oops! Select an STM32F1 board in 'Tools > Board.'"
+#endif
+
+#if HOTENDS > 2 || E_STEPPERS > 2
+  #error "MKS Robin nano supports up to 2 hotends / E-steppers. Comment out this line to continue."
+#endif
+
+#define BOARD_NAME "MKS Robin nano"
+
+//
+// Release PB4 (Y_ENABLE_PIN) from JTAG NRST role
+//
+#define DISABLE_DEBUG
+
+//
+// Note: MKS Robin board is using SPI2 interface.
+//
+#define SPI_MODULE 2
+
+//
+// Limit Switches
+//
+#define X_STOP_PIN        PA15
+#define Y_STOP_PIN        PA12
+#define Z_MIN_PIN         PA11
+#define Z_MAX_PIN         PC4
+
+//
+// Steppers
+//
+#define X_ENABLE_PIN       PE4
+#define X_STEP_PIN         PE3
+#define X_DIR_PIN          PE2
+
+#define Y_ENABLE_PIN       PE1
+#define Y_STEP_PIN         PE0
+#define Y_DIR_PIN          PB9
+
+#define Z_ENABLE_PIN       PB8
+#define Z_STEP_PIN         PB5
+#define Z_DIR_PIN          PB4
+
+#define E0_ENABLE_PIN      PB3
+#define E0_STEP_PIN        PD6
+#define E0_DIR_PIN         PD3
+
+#define E1_ENABLE_PIN      PA3
+#define E1_STEP_PIN        PA6
+#define E1_DIR_PIN         PA1
+
+//
+// Temperature Sensors
+//
+#define TEMP_0_PIN         PC1   // TH1
+#define TEMP_1_PIN         PC2   // TH2
+#define TEMP_BED_PIN       PC0   // TB1
+
+//
+// Heaters / Fans
+//
+#define HEATER_0_PIN       PC3   // HEATER1
+#define HEATER_1_PIN       PB0   // HEATER2
+#define HEATER_BED_PIN     PA0   // HOT BED
+
+#define FAN_PIN            PA1   // FAN
+
+#define BTN_ENC            PC13  // Pin is not connected. Real pin is needed to enable encoder's push button functionality used by touch screen
+
+//#define MAX6675_SS_PIN     PE5  // TC1 - CS1
+//#define MAX6675_SS_PIN     PE6  // TC2 - CS2
+
+#define POWER_LOSS_PIN     PA2   // PW_DET
+#define PS_ON_PIN          PA3   // PW_OFF
+#define FIL_RUNOUT_PIN     PA4   // MT_DET
+
+#define BEEPER_PIN         PC5
+#define LED_PIN            PB2
+
+/**
+ * Note: MKS Robin TFT screens may have different TFT controllers
+ * If the screen stays white, disable 'LCD_RESET_PIN' to rely on the bootloader to do screen initialization.
+ */
+#define LCD_RESET_PIN      PF6
+#define NO_LCD_REINIT             // Suppress LCD re-initialization
+
+#define LCD_BACKLIGHT_PIN  PD13
+#define FSMC_CS_PIN        PD7   // NE4
+#define FSMC_RS_PIN        PD11  // A0
+#define TOUCH_CS           PA7
+
+#define SD_DETECT_PIN      PD12