From 1b76e9bf72c05933ed912d2603bfa2d057db800e Mon Sep 17 00:00:00 2001
From: Develo <deveyes@gmail.com>
Date: Mon, 20 Nov 2017 14:39:27 -0300
Subject: [PATCH] Clear dirty flag in begin and reallocate only if necessary,
 add getConstDataPtr method (#2217) (#3849)

---
 libraries/EEPROM/EEPROM.cpp | 13 +++++++++++--
 libraries/EEPROM/EEPROM.h   |  1 +
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/libraries/EEPROM/EEPROM.cpp b/libraries/EEPROM/EEPROM.cpp
index b7909d0c3..b5b8bfc15 100644
--- a/libraries/EEPROM/EEPROM.cpp
+++ b/libraries/EEPROM/EEPROM.cpp
@@ -56,16 +56,21 @@ void EEPROMClass::begin(size_t size) {
 
   size = (size + 3) & (~3);
 
-  if (_data) {
+  //In case begin() is called a 2nd+ time, don't reallocate if size is the same
+  if(_data && size != _size) {
     delete[] _data;
+    _data = new uint8_t[size];
+  } else if(!_data) {
+    _data = new uint8_t[size];
   }
 
-  _data = new uint8_t[size];
   _size = size;
 
   noInterrupts();
   spi_flash_read(_sector * SPI_FLASH_SEC_SIZE, reinterpret_cast<uint32_t*>(_data), _size);
   interrupts();
+
+  _dirty = false; //make sure dirty is cleared in case begin() is called 2nd+ time
 }
 
 void EEPROMClass::end() {
@@ -131,6 +136,10 @@ uint8_t * EEPROMClass::getDataPtr() {
   return &_data[0];
 }
 
+uint8_t const * EEPROMClass::getConstDataPtr() {
+  return &_data[0];
+}
+
 #if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_EEPROM)
 EEPROMClass EEPROM;
 #endif
diff --git a/libraries/EEPROM/EEPROM.h b/libraries/EEPROM/EEPROM.h
index 3a26d02e6..934a995a0 100644
--- a/libraries/EEPROM/EEPROM.h
+++ b/libraries/EEPROM/EEPROM.h
@@ -38,6 +38,7 @@ public:
   void end();
 
   uint8_t * getDataPtr();
+  uint8_t const * getConstDataPtr();
 
   template<typename T> 
   T &get(int address, T &t) {