From 9b291b876868c84d05da2deeb47b03d5e6dd2c2f Mon Sep 17 00:00:00 2001
From: Matthijs Kooijman <matthijs@stdin.nl>
Date: Tue, 4 Jun 2013 10:58:56 +0200
Subject: [PATCH] Let SoftwareSerial::listen() fail on invalid rx baud rates

In this case, SoftwareSerial::begin will not have enabled the
interrupts, so better not allow the SoftwareSerial instance to enter the
listening state either.
---
 libraries/SoftwareSerial/SoftwareSerial.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libraries/SoftwareSerial/SoftwareSerial.cpp b/libraries/SoftwareSerial/SoftwareSerial.cpp
index 8476deb..605c788 100644
--- a/libraries/SoftwareSerial/SoftwareSerial.cpp
+++ b/libraries/SoftwareSerial/SoftwareSerial.cpp
@@ -178,6 +178,9 @@ inline void SoftwareSerial::tunedDelay(uint16_t delay) {
 // one and returns true if it replaces another 
 bool SoftwareSerial::listen()
 {
+  if (!_rx_delay_stopbit)
+    return false;
+
   if (active_object != this)
   {
     _buffer_overflow = false;