From a621eff2494319f76f6aa11fdeb509110006d2cb Mon Sep 17 00:00:00 2001
From: Hashem Zavvari <hashemzawary@gmail.com>
Date: Thu, 20 May 2021 21:15:22 +0430
Subject: [PATCH] Update NeoSWSerial.cpp

1- In line 138, rxPin input mode changed to INPUT_PULLUP for cancel noise.
2- In lin 268, peek method added.
---
 src/NeoSWSerial.cpp | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/NeoSWSerial.cpp b/src/NeoSWSerial.cpp
index ce8edfe..a1e5bf7 100644
--- a/src/NeoSWSerial.cpp
+++ b/src/NeoSWSerial.cpp
@@ -135,7 +135,7 @@ void NeoSWSerial::listen()
   if (listener)
     listener->ignore();
 
-  pinMode(rxPin, INPUT);
+  pinMode(rxPin, INPUT_PULLUP);
   rxBitMask = digitalPinToBitMask( rxPin );
   rxPort    = portInputRegister( digitalPinToPort( rxPin ) );
 
@@ -268,6 +268,17 @@ int NeoSWSerial::available()
 
 //----------------------------------------------------------------------------
 
+int NeoSWSerial::peek(void)
+{
+  if (rxHead == rxTail) {
+    return -1;
+  } else {
+    return rxBuffer[rxTail];
+  }
+} // peek
+
+//----------------------------------------------------------------------------
+
 int NeoSWSerial::read()
 {
   if (rxHead == rxTail) return -1;