From f0b7959425623e3229aadadd4145560b4064aa79 Mon Sep 17 00:00:00 2001
From: me-no-dev <hristo@espressif.com>
Date: Sun, 13 Nov 2016 17:01:44 +0200
Subject: [PATCH] add default pins for UART1 and UART2

NOTE: UART1's default pins can be used only when SPI Flash is DIO

thanks @ladyada
---
 cores/esp32/HardwareSerial.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/cores/esp32/HardwareSerial.cpp b/cores/esp32/HardwareSerial.cpp
index c198b74d..1b03d2a3 100644
--- a/cores/esp32/HardwareSerial.cpp
+++ b/cores/esp32/HardwareSerial.cpp
@@ -15,6 +15,14 @@ void HardwareSerial::begin(unsigned long baud, uint32_t config, int8_t rxPin, in
         rxPin = 3;
         txPin = 1;
     }
+    if(_uart_nr == 1 && rxPin < 0 && txPin < 0) {
+        rxPin = 9;
+        txPin = 10;
+    }
+    if(_uart_nr == 2 && rxPin < 0 && txPin < 0) {
+        rxPin = 16;
+        txPin = 17;
+    }
     _uart = uartBegin(_uart_nr, baud, config, rxPin, txPin, 256, false);
 }