Add default pin definitions

Author: microdev1

ports/esp32s2/boards/microdev_micro_s2/mpconfigboard.h

@@ -25,16 +25,27 @@
  */
 
 //Micropython setup
-
 #define MICROPY_HW_BOARD_NAME       "microS2"
 #define MICROPY_HW_MCU_NAME         "ESP32S2"
 
 #define MICROPY_HW_LED (&pin_GPIO21)
 #define MICROPY_HW_BUTTON (&pin_GPIO0)
 #define MICROPY_HW_NEOPIXEL (&pin_GPIO33)
 
+// Default bus pins
+#define DEFAULT_I2C_BUS_SCL (&pin_GPIO1)
+#define DEFAULT_I2C_BUS_SDA (&pin_GPIO2)
+
+#define DEFAULT_SPI_BUS_SCK (&pin_GPIO36)
+#define DEFAULT_SPI_BUS_MOSI (&pin_GPIO35)
+#define DEFAULT_SPI_BUS_MISO (&pin_GPIO37)
+
+#define DEFAULT_UART_BUS_TX (&pin_GPIO43)
+#define DEFAULT_UART_BUS_RX (&pin_GPIO44)
+
 #define CIRCUITPY_BOOT_BUTTON (&pin_GPIO0)
 
+// Explanation of how a user got into safe mode.
 #define BOARD_USER_SAFE_MODE_ACTION translate("pressing boot button at start up.\n")
 
 #define AUTORESET_DELAY_MS 500