From ed331a817a1f14f0a6bfe60d24f5bdc73843eafe Mon Sep 17 00:00:00 2001
From: chromhelm <chromhelm@users.noreply.github.com>
Date: Thu, 21 May 2015 21:42:40 +0200
Subject: [PATCH] Fixed bug with flushing

---
 hardware/arduino/avr/cores/arduino/HardwareSerial.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hardware/arduino/avr/cores/arduino/HardwareSerial.cpp b/hardware/arduino/avr/cores/arduino/HardwareSerial.cpp
index 41935e320..402269893 100644
--- a/hardware/arduino/avr/cores/arduino/HardwareSerial.cpp
+++ b/hardware/arduino/avr/cores/arduino/HardwareSerial.cpp
@@ -220,6 +220,7 @@ size_t HardwareSerial::write(uint8_t c)
   if (_tx_buffer_head == _tx_buffer_tail && bit_is_set(*_ucsra, UDRE0)) {
     *_udr = c;
     sbi(*_ucsra, TXC0);
+     _written = true;
     return 1;
   }
   tx_buffer_index_t i = (_tx_buffer_head + 1) % SERIAL_TX_BUFFER_SIZE;