HAL for Espressif ESP32 Wifi

Marlin/src/pins/pins.h

@@ -381,6 +381,13 @@
 #elif MB(THE_BORG)
   #include "pins_THE_BORG.h"          // STM32F7                                    env:STM32F7
 
+//
+// Espressif ESP32
+//
+
+#elif MB(ESP32)
+  #include "pins_ESP32.h"
+
 #else
   #error "Unknown MOTHERBOARD value set in Configuration.h"
 #endif

Marlin/src/pins/pins_ESP32.h

@@ -0,0 +1,72 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (C) 2016 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/>.
+ *
+ */
+
+/**
+ * Espressif ESP32 (Tensilica Xtensa LX6) pin assignments
+ */
+
+#ifndef BOARD_NAME
+  #define BOARD_NAME "Espressif ESP32"
+#endif
+
+//
+// Limit Switches
+//
+#define X_MIN_PIN          34
+#define Y_MIN_PIN          35
+#define Z_MIN_PIN          15
+
+//
+// Steppers
+//
+#define X_STEP_PIN         27
+#define X_DIR_PIN          26
+#define X_ENABLE_PIN       25
+//#define X_CS_PIN            0
+
+#define Y_STEP_PIN         33
+#define Y_DIR_PIN          32
+#define Y_ENABLE_PIN       X_ENABLE_PIN
+//#define Y_CS_PIN           13
+
+#define Z_STEP_PIN         14
+#define Z_DIR_PIN          12
+#define Z_ENABLE_PIN       X_ENABLE_PIN
+//#define Z_CS_PIN            5 // SS_PIN
+
+#define E0_STEP_PIN        16
+#define E0_DIR_PIN         17
+#define E0_ENABLE_PIN      X_ENABLE_PIN
+//#define E0_CS_PIN          21
+
+//
+// Temperature Sensors
+//
+#define TEMP_0_PIN         36   // Analog Input
+#define TEMP_BED_PIN       39   // Analog Input
+
+//
+// Heaters / Fans
+//
+#define HEATER_0_PIN        2
+#define FAN_PIN            13
+#define HEATER_BED_PIN      4