From a1bef8b5c3a156e8a0a9c56011849b7f1efd2d3c Mon Sep 17 00:00:00 2001
From: me-no-dev <hristo@espressif.com>
Date: Wed, 2 Aug 2017 00:32:42 +0300
Subject: [PATCH] improve Serial repeated begin/baud change

---
 cores/esp32/HardwareSerial.cpp | 3 +++
 cores/esp32/esp32-hal-uart.c   | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/cores/esp32/HardwareSerial.cpp b/cores/esp32/HardwareSerial.cpp
index 84124bd40..18d44a29a 100644
--- a/cores/esp32/HardwareSerial.cpp
+++ b/cores/esp32/HardwareSerial.cpp
@@ -11,6 +11,9 @@ HardwareSerial::HardwareSerial(int uart_nr) : _uart_nr(uart_nr), _uart(NULL) {}
 
 void HardwareSerial::begin(unsigned long baud, uint32_t config, int8_t rxPin, int8_t txPin)
 {
+    if(_uart) {
+        end();
+    }
     if(_uart_nr == 0 && rxPin < 0 && txPin < 0) {
         rxPin = 3;
         txPin = 1;
diff --git a/cores/esp32/esp32-hal-uart.c b/cores/esp32/esp32-hal-uart.c
index 4730720bd..055e4fc68 100644
--- a/cores/esp32/esp32-hal-uart.c
+++ b/cores/esp32/esp32-hal-uart.c
@@ -223,6 +223,8 @@ void uartEnd(uart_t* uart)
 
     UART_MUTEX_LOCK();
     if(uart->queue != NULL) {
+        uint8_t c;
+        while(xQueueReceive(uart->queue, &c, 0));
         vQueueDelete(uart->queue);
     }
 
-- 
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