Update LoRaMacInitializationTime type to SysTime_t.

It allows to handle much longer periods of time.
With TimerTime_t 32 bits values the time overflowed after around 49 days.
With SysTime_t values the time will only overflow after around 136 years.

#460

Author: mluis1

src/mac/LoRaMac.c

@@ -265,7 +265,7 @@ typedef struct sLoRaMacCtx
     *
     * \remark Used for the BACKOFF_DC computation.
     */
-    TimerTime_t InitializationTime;
+    SysTime_t InitializationTime;
     SysTime_t LastTxSysTime;
     /*
     * LoRaMac internal state
@@ -2349,7 +2349,7 @@ static void CalculateBackOff( uint8_t channel )
     }
     calcBackOff.DutyCycleEnabled = MacCtx.NvmCtx->DutyCycleOn;
     calcBackOff.Channel = channel;
-    calcBackOff.ElapsedTime = TimerGetElapsedTime( MacCtx.InitializationTime );
+    calcBackOff.ElapsedTime = SysTimeSub( SysTimeGetMcuTime( ), MacCtx.InitializationTime );
     calcBackOff.TxTimeOnAir = MacCtx.TxTimeOnAir;
     calcBackOff.LastTxIsJoinRequest = MacCtx.LastTxIsJoinRequest;
 
@@ -3037,7 +3037,7 @@ LoRaMacStatus_t LoRaMacInitialization( LoRaMacPrimitives_t* primitives, LoRaMacC
     TimerInit( &MacCtx.AckTimeoutTimer, OnAckTimeoutTimerEvent );
 
     // Store the current initialization time
-    MacCtx.InitializationTime = TimerGetCurrentTime( );
+    MacCtx.InitializationTime = SysTimeGetMcuTime( );
 
     // Initialize Radio driver
     MacCtx.RadioEvents.TxDone = OnRadioTxDone;

src/mac/region/Region.h

@@ -1185,7 +1185,7 @@ typedef struct sCalcBackOffParams
     /*!
      * Elapsed time since the start of the node.
      */
-    TimerTime_t ElapsedTime;
+    SysTime_t ElapsedTime;
     /*!
      * Time-on-air of the last transmission.
      */

src/mac/region/RegionCommon.c

@@ -51,15 +51,15 @@ static uint8_t CountChannels( uint16_t mask, uint8_t nbBits )
     return nbActiveBits;
 }
 
-uint16_t RegionCommonGetJoinDc( TimerTime_t elapsedTime )
+uint16_t RegionCommonGetJoinDc( SysTime_t elapsedTime )
 {
     uint16_t dutyCycle = 0;
 
-    if( elapsedTime < 3600000 )
+    if( elapsedTime.Seconds < 3600 )
     {
         dutyCycle = BACKOFF_DC_1_HOUR;
     }
-    else if( elapsedTime < ( 3600000 + 36000000 ) )
+    else if( elapsedTime.Seconds < ( 3600 + 36000 ) )
     {
         dutyCycle = BACKOFF_DC_10_HOURS;
     }

src/mac/region/RegionCommon.h

@@ -161,7 +161,7 @@ typedef struct sRegionCommonCalcBackOffParams
     /*!
      * The elapsed time since initialization.
      */
-    TimerTime_t ElapsedTime;
+    SysTime_t ElapsedTime;
     /*!
      * The time on air of the last Tx frame.
      */
@@ -208,7 +208,7 @@ typedef struct sRegionCommonRxBeaconSetupParams
  *
  * \retval Duty cycle restriction.
  */
-uint16_t RegionCommonGetJoinDc( TimerTime_t elapsedTime );
+uint16_t RegionCommonGetJoinDc( SysTime_t elapsedTime );
 
 /*!
  * \brief Verifies, if a value is in a given range.