From 833c2e54a135c38feb438cee397eb83eaec3710a Mon Sep 17 00:00:00 2001
From: Scott Lahteine <github@thinkyhead.com>
Date: Mon, 25 Feb 2019 13:47:55 -0600
Subject: [PATCH] Add an empty flushTX to MarlinSerialUSB_Due

---
 Marlin/src/HAL/HAL_DUE/MarlinSerialUSB_Due.cpp | 4 ++--
 Marlin/src/HAL/HAL_DUE/MarlinSerialUSB_Due.h   | 1 +
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/Marlin/src/HAL/HAL_DUE/MarlinSerialUSB_Due.cpp b/Marlin/src/HAL/HAL_DUE/MarlinSerialUSB_Due.cpp
index 4f6b4915f..7b1100dd9 100644
--- a/Marlin/src/HAL/HAL_DUE/MarlinSerialUSB_Due.cpp
+++ b/Marlin/src/HAL/HAL_DUE/MarlinSerialUSB_Due.cpp
@@ -114,8 +114,8 @@ bool MarlinSerialUSB::available(void) {
       (usb_task_cdc_isenabled() && udi_cdc_is_rx_ready());
 }
 
-void MarlinSerialUSB::flush(void) {
-}
+void MarlinSerialUSB::flush(void) { }
+void MarlinSerialUSB::flushTX(void) { }
 
 void MarlinSerialUSB::write(const uint8_t c) {
 
diff --git a/Marlin/src/HAL/HAL_DUE/MarlinSerialUSB_Due.h b/Marlin/src/HAL/HAL_DUE/MarlinSerialUSB_Due.h
index 65f829e2a..5025b8228 100644
--- a/Marlin/src/HAL/HAL_DUE/MarlinSerialUSB_Due.h
+++ b/Marlin/src/HAL/HAL_DUE/MarlinSerialUSB_Due.h
@@ -46,6 +46,7 @@ public:
   static int peek(void);
   static int read(void);
   static void flush(void);
+  static void flushTX(void);
   static bool available(void);
   static void write(const uint8_t c);