From 060d7ade89d963b4073634803fcd58b2be7e172c Mon Sep 17 00:00:00 2001
From: Sameer Puri <11097096+sameer@users.noreply.github.com>
Date: Thu, 19 Mar 2020 13:00:22 -0400
Subject: [PATCH] Fix MKR Vidor 4000 Serial.dtr

This value is incorrect and prevents GPIO0 from being pulled at the right time, so esptool could not detect the board at all.
Now, it works perfectly with the added --no-stub parameter.
See this forum post for further discussion: https://forum.arduino.cc/index.php?topic=596970.0
---
 examples/Tools/SerialNINAPassthrough/SerialNINAPassthrough.ino | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/examples/Tools/SerialNINAPassthrough/SerialNINAPassthrough.ino b/examples/Tools/SerialNINAPassthrough/SerialNINAPassthrough.ino
index acfd078c..4d571f1f 100644
--- a/examples/Tools/SerialNINAPassthrough/SerialNINAPassthrough.ino
+++ b/examples/Tools/SerialNINAPassthrough/SerialNINAPassthrough.ino
@@ -74,7 +74,7 @@ void loop() {
 
   if (dtr != Serial.dtr()) {
 #ifdef ARDUINO_SAMD_MKRVIDOR4000
-    FPGA.digitalWrite(FPGA_NINA_GPIO0, (Serial.dtr() == 1) ? HIGH : LOW);
+    FPGA.digitalWrite(FPGA_NINA_GPIO0, (Serial.dtr() == 0) ? HIGH : LOW);
 #else
     digitalWrite(NINA_GPIO0, (Serial.dtr() == 0) ? HIGH : LOW);
 #endif