From 705febfc9c9a7ce97d385c3553c107856d431ded Mon Sep 17 00:00:00 2001
From: sysshad <stig.brannlund@gmail.com>
Date: Wed, 22 Aug 2018 22:22:21 +0200
Subject: [PATCH] Added possibility to check whether it was the WDT interrupt
 which woke the MCU

Added possibility to check whether it was the WDT interrupt which
 woke the MCU.
Quite useful if you have multiple wakeup sources and wants to know which one it was.
---
 LowPower.cpp | 23 ++++++++++++++++++++++-
 LowPower.h   |  6 ++++--
 2 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/LowPower.cpp b/LowPower.cpp
index 4e14e1a..94f26fb 100644
--- a/LowPower.cpp
+++ b/LowPower.cpp
@@ -1,6 +1,6 @@
 /*******************************************************************************
 * LowPower Library
-* Version: 1.60
+* Version: 1.70
 * Date: 01-04-2016
 * Author: Lim Phang Moh
 * Company: Rocket Scream Electronics
@@ -13,6 +13,8 @@
 *
 * Revision  Description
 * ========  ===========
+* 1.70      Added possibility to check whether it was the WDT interrupt which 
+*           woke the MCU. Contributed by Sysshad.
 * 1.60      Added support for ATmega256RFR2. Contributed by Rodmg. 
 * 1.50      Fixed compiler optimization (Arduino IDE 1.6.x branch) on BOD enable
 *           function that causes the function to be over optimized.
@@ -1119,6 +1121,22 @@ void	LowPowerClass::powerExtStandby(period_t period, adc_t adc, bod_t bod,
 	#endif
 }
 
+/*******************************************************************************
+ * Function to call to know if it was the WDT interrupt that woke the MCU
+ * Good if you have multiple wakeup sources like BOD, IO INT, etc... and
+ * wants to know which one occured.
+ * Note: Clears the event (sets it to false) so next call will return false
+ *       unless another WDT event occured meanwhile.
+ *******************************************************************************/
+bool LowPowerClass::getWDTEventStatus()
+{
+	bool ret = LowPower._wdtEvent;
+	
+	LowPower._wdtEvent = false;
+
+	return ret;
+}
+
 /*******************************************************************************
 * Name: ISR (WDT_vect)
 * Description: Watchdog Timer interrupt service routine. This routine is 
@@ -1130,6 +1148,9 @@ ISR (WDT_vect)
 {
 	// WDIE & WDIF is cleared in hardware upon entering this ISR
 	wdt_disable();
+
+	// Inform that an WDT event occured!
+	LowPower._wdtEvent = true;
 }
 
 #elif defined (__arm__)
diff --git a/LowPower.h b/LowPower.h
index ac4054c..5d10fdc 100644
--- a/LowPower.h
+++ b/LowPower.h
@@ -119,7 +119,8 @@ class LowPowerClass
 {
 	public:
 		#if defined (__AVR__)
-		
+		volatile bool _wdtEvent = false;
+
 			#if defined (__AVR_ATmega328P__) || defined (__AVR_ATmega168__) 
 				void	idle(period_t period, adc_t adc, timer2_t timer2, 
 						     timer1_t timer1, timer0_t timer0, spi_t spi,
@@ -152,7 +153,8 @@ class LowPowerClass
 			void	powerSave(period_t period, adc_t adc, bod_t bod, timer2_t timer2) __attribute__((optimize("-O1")));
 			void	powerStandby(period_t period, adc_t adc, bod_t bod) __attribute__((optimize("-O1")));
 			void	powerExtStandby(period_t period, adc_t adc, bod_t bod, timer2_t timer2) __attribute__((optimize("-O1")));
-		
+			bool  getWDTEventStatus();
+
 		#elif defined (__arm__)
 			
 			#if defined (__SAMD21G18A__)