From e7141291a58da23de4ec455f7e7a7cb0c5d1df75 Mon Sep 17 00:00:00 2001
From: Cristian Maglie <c.maglie@bug.st>
Date: Tue, 25 Sep 2012 19:50:35 +0200
Subject: [PATCH] Workaround for spurious port opening after upload (Arduino
 Due)

---
 hardware/arduino/sam/cores/arduino/USB/CDC.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hardware/arduino/sam/cores/arduino/USB/CDC.cpp b/hardware/arduino/sam/cores/arduino/USB/CDC.cpp
index 40714c9ab..615d2a2c3 100644
--- a/hardware/arduino/sam/cores/arduino/USB/CDC.cpp
+++ b/hardware/arduino/sam/cores/arduino/USB/CDC.cpp
@@ -252,6 +252,10 @@ size_t Serial_::write(uint8_t c) {
 // where the port is configured (lineState != 0) but not quite opened.
 Serial_::operator bool()
 {
+	// this is here to avoid spurious opening after upload
+	if (millis() < 500)
+		return false;
+
 	bool result = false;
 
 	if (_usbLineInfo.lineState > 0)