From 5d6473c3a80a4352a1e301e22d32830a8a0a51f5 Mon Sep 17 00:00:00 2001
From: Sakib Ahmed Sumdany <ahmadSum1@users.noreply.github.com>
Date: Mon, 24 Jul 2017 09:21:59 +0600
Subject: [PATCH] compatibility issue with the ESP8266 Arduino core because it
 uses a busy loop.

---
 src/Keypad.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/Keypad.cpp b/src/Keypad.cpp
index f146a6d..1ae8b56 100644
--- a/src/Keypad.cpp
+++ b/src/Keypad.cpp
@@ -210,8 +210,10 @@ int Keypad::findInList (int keyCode) {
 // New in 2.0
 char Keypad::waitForKey() {
 	char waitKey = NO_KEY;
-	while( (waitKey = getKey()) == NO_KEY );	// Block everything while waiting for a keypress.
-	return waitKey;
+	while( (waitKey = getKey()) == NO_KEY ){	// Block everything while waiting for a keypress.
+		delay(0);
+		return waitKey;
+	}
 }
 
 // Backwards compatibility function.