Application example using LoRaWAN-lib MAC layer implementation

Dependencies:   mbed LoRaWAN-lib SX1272Lib

LoRaWAN-demo is a ClassA device example project using LoRaWAN-lib and SX1272Lib libraries.

This demo application sends a frame every 4 to 6 seconds (randomly) and displays its current status using a serial port as display(VT100).

The serial port settings are as shown in below image. To access the serial port settings please click on "Setup" menu and then "Serial port..."

/media/uploads/mluis/serial_port_settings.png

The terminal window should be setup as shown in below image. To access the terminal window settings please click on "Setup" menu and then "Terminal..."

/media/uploads/mluis/terminal_window_settings.png

The image below shows the VT100 application status.

Application main screen

The application gives the possibility to either activate the device using

  • Over The Air Activation (OTAA)
  • Personalization activation (PA)

The activation mode can be adjusted in Comissioning.h by changing the following parameter:

/*!
 * When set to 1 the application uses the Over-the-Air activation procedure
 * When set to 0 the application uses the Personalization activation procedure
 */
#define OVER_THE_AIR_ACTIVATION                     1


The application gives the possibility to select which kind of network we are connecting to.

  • Public Network (true)
  • Private Network (false)

The netork type can be changed as follows:

/*!
 * Indicates if the end-device is to be connected to a private or public network
 */
#define LORAWAN_PUBLIC_NETWORK                      true


OTAA
When OTAA is selected the user must porvide a device EUI, an application EUI and an application key.
These can be adjusted by changing the following parameters:

/*!
 * Mote device IEEE EUI (big endian)
 */
#define LORAWAN_DEVICE_EUI                          { 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88 }

/*!
 * Application IEEE EUI (big endian)
 */
#define LORAWAN_APPLICATION_EUI                     { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }

/*!
 * AES encryption/decryption cipher application key
 */
#define LORAWAN_APPLICATION_KEY                     { 0x2B, 0x7E, 0x15, 0x16, 0x28, 0xAE, 0xD2, 0xA6, 0xAB, 0xF7, 0x15, 0x88, 0x09, 0xCF, 0x4F, 0x3C }


PA
When PA is selected the user must porvide a network ID, a device address, a network session key and an application session key.
These can be adjusted by changing the following parameters:

/*!
 * Current network ID
 */
#define LORAWAN_NETWORK_ID                          ( uint32_t )0

/*!
 * Device address on the network (big endian)
 */
#define LORAWAN_DEVICE_ADDRESS                      ( uint32_t )0x12345678

/*!
 * AES encryption/decryption cipher network session key
 */
#define LORAWAN_NWKSKEY                             { 0x2B, 0x7E, 0x15, 0x16, 0x28, 0xAE, 0xD2, 0xA6, 0xAB, 0xF7, 0x15, 0x88, 0x09, 0xCF, 0x4F, 0x3C }

/*!
 * AES encryption/decryption cipher application session key
 */
#define LORAWAN_APPSKEY                             { 0x2B, 0x7E, 0x15, 0x16, 0x28, 0xAE, 0xD2, 0xA6, 0xAB, 0xF7, 0x15, 0x88, 0x09, 0xCF, 0x4F, 0x3C }


On top of main.c the user has the possibility to tweak some application settings such as:

  • Join requests transmission frequency
  • Frames transmission frequency
  • Application default datarate
  • Confirmed or Unconfirmed frames transmission
  • ADR (Adaptive Datarate) ON/OFF
  • Application port to be used by the transmitted frames

The join requests transmission frequency can be adjusted by changing the follwoing parameter:

/*!
 * Join requests trials duty cycle.
 */
#define OVER_THE_AIR_ACTIVATION_DUTYCYCLE           10000000  // 10 [s] value in us


The frame transmission frequency can be adjusted by changing the follwoing parameters:

/*!
 * Defines the application data transmission duty cycle. 5s, value in [us].
 */
#define APP_TX_DUTYCYCLE                            5000000

/*!
 * Defines a random delay for application data transmission duty cycle. 1s,
 * value in [us].
 */
#define APP_TX_DUTYCYCLE_RND                        1000000


The frame transmission scheduling is then executed as follows:

        if( ScheduleNextTx == true )
        {
            ScheduleNextTx = false;
            // Schedule next packet transmission
            TxDutyCycleTime = APP_TX_DUTYCYCLE + randr( -APP_TX_DUTYCYCLE_RND, APP_TX_DUTYCYCLE_RND );
            TimerSetValue( &TxNextPacketTimer, TxDutyCycleTime );
            TimerStart( &TxNextPacketTimer );
        }


The application default datarate can be adjusted by changing the following parameter:

Quote:

When ADR is off this setting is the fixed datarate that will be used by the application.
When ADR is on this setting is the initial datarate used by the application.

/*!
 * Default mote datarate
 */
#define LORAWAN_DEFAULT_DATARATE                    DR_0


The transmitted frame contents will depend on LORAWAN_CONFIRMED_MSG_ON value.

/*!
 * LoRaWAN confirmed messages
 */
#define LORAWAN_CONFIRMED_MSG_ON                    true
  • If LORAWAN_CONFIRMED_MSG_ON equals false then the application payload is one byte corresponding to the AppLed state.
  • If LORAWAN_CONFIRMED_MSG_ON equals true then the application payload is six bytes corresponding to the AppLed state, Downlink counter (unsigned 16 bits), received RSSI (signed 16 bits) and received SNR (signed 8 bits).

/*!
 * \brief   Prepares the payload of the frame
 */
static void PrepareTxFrame( uint8_t port )
{

    switch( port )
    {
    case 15:
        {
            AppData[0] = AppLedStateOn;
            if( IsTxConfirmed == true )
            {
                AppData[1] = LoRaMacDownlinkStatus.DownlinkCounter >> 8;
                AppData[2] = LoRaMacDownlinkStatus.DownlinkCounter;
                AppData[3] = LoRaMacDownlinkStatus.Rssi >> 8;
                AppData[4] = LoRaMacDownlinkStatus.Rssi;
                AppData[5] = LoRaMacDownlinkStatus.Snr;
            }
        }
        break;
    case 224:
...
}


The ADR enabling/disabling can be adjusted by changing the following parameter:

/*!
 * LoRaWAN Adaptive Data Rate
 *
 * \remark Please note that when ADR is enabled the end-device should be static
 */
#define LORAWAN_ADR_ON                              1


The application port can be adjusted by changing the following parameter:

/*!
 * LoRaWAN application port
 */
#define LORAWAN_APP_PORT                            15

Files at this revision

API Documentation at this revision

Comitter:
mluis
Date:
Fri May 13 15:14:44 2016 +0000
Parent:
2:2eeaeae2c725
Child:
4:78bf111a5f6a
Commit message:
Updated mbed, LoRaWAN-lib and SX1272Lib libraries.

Changed in this revision

app/Comissioning.h Show annotated file Show diff for this revision Revisions of this file
app/main.cpp Show annotated file Show diff for this revision Revisions of this file
mac/LoRaWAN-lib.lib Show annotated file Show diff for this revision Revisions of this file
mbed.bld Show annotated file Show diff for this revision Revisions of this file
radio/SX1272Lib.lib Show annotated file Show diff for this revision Revisions of this file
system/crypto/aes.cpp Show annotated file Show diff for this revision Revisions of this file
system/crypto/cmac.cpp Show annotated file Show diff for this revision Revisions of this file
system/timer.cpp Show annotated file Show diff for this revision Revisions of this file
system/timer.h Show annotated file Show diff for this revision Revisions of this file
--- a/app/Comissioning.h	Mon Mar 14 09:17:05 2016 +0000
+++ b/app/Comissioning.h	Fri May 13 15:14:44 2016 +0000
@@ -29,9 +29,14 @@
 #if( OVER_THE_AIR_ACTIVATION != 0 )
 
 /*!
+ * IEEE Organizationally Unique Identifier ( OUI ) (big endian)
+ */
+#define IEEE_OUI                                    0x11, 0x22, 0x33
+
+/*!
  * Mote device IEEE EUI (big endian)
  */
-#define LORAWAN_DEVICE_EUI                          { 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88 }
+#define LORAWAN_DEVICE_EUI                          { IEEE_OUI, 0x44, 0x55, 0x66, 0x77, 0x88 }
 
 /*!
  * Application IEEE EUI (big endian)
--- a/app/main.cpp	Mon Mar 14 09:17:05 2016 +0000
+++ b/app/main.cpp	Fri May 13 15:14:44 2016 +0000
@@ -23,7 +23,7 @@
 /*!
  * Join requests trials duty cycle.
  */
-#define OVER_THE_AIR_ACTIVATION_DUTYCYCLE           10000000  // 10 [s] value in us
+#define OVER_THE_AIR_ACTIVATION_DUTYCYCLE           10000000 // 10 [s] value in us
 
 /*!
  * Defines the application data transmission duty cycle. 5s, value in [us].
@@ -37,7 +37,7 @@
 #define APP_TX_DUTYCYCLE_RND                        1000000
 
 /*!
- * Default mote datarate
+ * Default datarate
  */
 #define LORAWAN_DEFAULT_DATARATE                    DR_0
 
@@ -64,6 +64,20 @@
  */
 #define LORAWAN_DUTYCYCLE_ON                        true
 
+#define USE_SEMTECH_DEFAULT_CHANNEL_LINEUP          1
+
+#if( USE_SEMTECH_DEFAULT_CHANNEL_LINEUP == 1 ) 
+
+#define LC4                { 867100000, { ( ( DR_5 << 4 ) | DR_0 ) }, 0 }
+#define LC5                { 867300000, { ( ( DR_5 << 4 ) | DR_0 ) }, 0 }
+#define LC6                { 867500000, { ( ( DR_5 << 4 ) | DR_0 ) }, 0 }
+#define LC7                { 867700000, { ( ( DR_5 << 4 ) | DR_0 ) }, 0 }
+#define LC8                { 867900000, { ( ( DR_5 << 4 ) | DR_0 ) }, 0 }
+#define LC9                { 868800000, { ( ( DR_7 << 4 ) | DR_7 ) }, 2 }
+#define LC10               { 868300000, { ( ( DR_6 << 4 ) | DR_6 ) }, 1 }
+
+#endif
+
 #endif
 
 /*!
@@ -342,7 +356,7 @@
         mcpsReq.Req.Unconfirmed.fBuffer = NULL;
         mcpsReq.Req.Unconfirmed.fBufferSize = 0;
         mcpsReq.Req.Unconfirmed.Datarate = LORAWAN_DEFAULT_DATARATE;
-        
+
         LoRaMacUplinkStatus.Acked = false;
         LoRaMacUplinkStatus.Port = 0;
         LoRaMacUplinkStatus.Buffer = NULL;
@@ -435,14 +449,14 @@
 /*!
  * \brief   MCPS-Confirm event function
  *
- * \param   [IN] McpsConfirm - Pointer to the confirm structure,
+ * \param   [IN] mcpsConfirm - Pointer to the confirm structure,
  *               containing confirm attributes.
  */
-static void McpsConfirm( McpsConfirm_t *McpsConfirm )
+static void McpsConfirm( McpsConfirm_t *mcpsConfirm )
 {
-    if( McpsConfirm->Status == LORAMAC_EVENT_INFO_STATUS_OK )
+    if( mcpsConfirm->Status == LORAMAC_EVENT_INFO_STATUS_OK )
     {
-        switch( McpsConfirm->McpsRequest )
+        switch( mcpsConfirm->McpsRequest )
         {
             case MCPS_UNCONFIRMED:
             {
@@ -455,8 +469,8 @@
                 // Check Datarate
                 // Check TxPower
                 // Check AckReceived
-                // Check NbRetries
-                LoRaMacUplinkStatus.Acked = McpsConfirm->AckReceived;
+                // Check NbTrials
+                LoRaMacUplinkStatus.Acked = mcpsConfirm->AckReceived;
                 break;
             }
             case MCPS_PROPRIETARY:
@@ -466,9 +480,9 @@
             default:
                 break;
         }
-        LoRaMacUplinkStatus.Datarate = McpsConfirm->Datarate;
-        LoRaMacUplinkStatus.UplinkCounter = McpsConfirm->UpLinkCounter;
-    
+        LoRaMacUplinkStatus.Datarate = mcpsConfirm->Datarate;
+        LoRaMacUplinkStatus.UplinkCounter = mcpsConfirm->UpLinkCounter;
+
         UplinkStatusUpdated = true;
     }
     NextTx = true;
@@ -477,17 +491,17 @@
 /*!
  * \brief   MCPS-Indication event function
  *
- * \param   [IN] McpsIndication - Pointer to the indication structure,
+ * \param   [IN] mcpsIndication - Pointer to the indication structure,
  *               containing indication attributes.
  */
-static void McpsIndication( McpsIndication_t *McpsIndication )
+static void McpsIndication( McpsIndication_t *mcpsIndication )
 {
-    if( McpsIndication->Status != LORAMAC_EVENT_INFO_STATUS_OK )
+    if( mcpsIndication->Status != LORAMAC_EVENT_INFO_STATUS_OK )
     {
         return;
     }
 
-    switch( McpsIndication->McpsIndication )
+    switch( mcpsIndication->McpsIndication )
     {
         case MCPS_UNCONFIRMED:
         {
@@ -518,38 +532,38 @@
     // Check Rssi
     // Check Snr
     // Check RxSlot
-    LoRaMacDownlinkStatus.Rssi = McpsIndication->Rssi;
-    if( McpsIndication->Snr & 0x80 ) // The SNR sign bit is 1
+    LoRaMacDownlinkStatus.Rssi = mcpsIndication->Rssi;
+    if( mcpsIndication->Snr & 0x80 ) // The SNR sign bit is 1
     {
         // Invert and divide by 4
-        LoRaMacDownlinkStatus.Snr = ( ( ~McpsIndication->Snr + 1 ) & 0xFF ) >> 2;
+        LoRaMacDownlinkStatus.Snr = ( ( ~mcpsIndication->Snr + 1 ) & 0xFF ) >> 2;
         LoRaMacDownlinkStatus.Snr = -LoRaMacDownlinkStatus.Snr;
     }
     else
     {
         // Divide by 4
-        LoRaMacDownlinkStatus.Snr = ( McpsIndication->Snr & 0xFF ) >> 2;
+        LoRaMacDownlinkStatus.Snr = ( mcpsIndication->Snr & 0xFF ) >> 2;
     }
     LoRaMacDownlinkStatus.DownlinkCounter++;
-    LoRaMacDownlinkStatus.RxData = McpsIndication->RxData;
-    LoRaMacDownlinkStatus.Port = McpsIndication->Port;
-    LoRaMacDownlinkStatus.Buffer = McpsIndication->Buffer;
-    LoRaMacDownlinkStatus.BufferSize = McpsIndication->BufferSize;
+    LoRaMacDownlinkStatus.RxData = mcpsIndication->RxData;
+    LoRaMacDownlinkStatus.Port = mcpsIndication->Port;
+    LoRaMacDownlinkStatus.Buffer = mcpsIndication->Buffer;
+    LoRaMacDownlinkStatus.BufferSize = mcpsIndication->BufferSize;
 
     if( ComplianceTest.Running == true )
     {
         ComplianceTest.DownLinkCounter++;
     }
 
-    if( McpsIndication->RxData == true )
+    if( mcpsIndication->RxData == true )
     {
-        switch( McpsIndication->Port )
+        switch( mcpsIndication->Port )
         {
         case 1: // The application LED can be controlled on port 1 or 2
         case 2:
-            if( McpsIndication->BufferSize == 1 )
+            if( mcpsIndication->BufferSize == 1 )
             {
-                AppLedStateOn = McpsIndication->Buffer[0] & 0x01;
+                AppLedStateOn = mcpsIndication->Buffer[0] & 0x01;
                 Led3StateChanged = true;
             }
             break;
@@ -557,11 +571,11 @@
             if( ComplianceTest.Running == false )
             {
                 // Check compliance test enable command (i)
-                if( ( McpsIndication->BufferSize == 4 ) && 
-                    ( McpsIndication->Buffer[0] == 0x01 ) &&
-                    ( McpsIndication->Buffer[1] == 0x01 ) &&
-                    ( McpsIndication->Buffer[2] == 0x01 ) &&
-                    ( McpsIndication->Buffer[3] == 0x01 ) )
+                if( ( mcpsIndication->BufferSize == 4 ) &&
+                    ( mcpsIndication->Buffer[0] == 0x01 ) &&
+                    ( mcpsIndication->Buffer[1] == 0x01 ) &&
+                    ( mcpsIndication->Buffer[2] == 0x01 ) &&
+                    ( mcpsIndication->Buffer[3] == 0x01 ) )
                 {
                     IsTxConfirmed = false;
                     AppPort = 224;
@@ -585,7 +599,7 @@
             }
             else
             {
-                ComplianceTest.State = McpsIndication->Buffer[0];
+                ComplianceTest.State = mcpsIndication->Buffer[0];
                 switch( ComplianceTest.State )
                 {
                 case 0: // Check compliance test disable command (ii)
@@ -615,12 +629,12 @@
                     ComplianceTest.State = 1;
                     break;
                 case 4: // (vii)
-                    AppDataSize = McpsIndication->BufferSize;
+                    AppDataSize = mcpsIndication->BufferSize;
 
                     AppData[0] = 4;
                     for( uint8_t i = 1; i < AppDataSize; i++ )
                     {
-                        AppData[i] = McpsIndication->Buffer[i] + 1;
+                        AppData[i] = mcpsIndication->Buffer[i] + 1;
                     }
                     break;
                 case 5: // (viii)
@@ -650,14 +664,14 @@
 /*!
  * \brief   MLME-Confirm event function
  *
- * \param   [IN] MlmeConfirm - Pointer to the confirm structure,
+ * \param   [IN] mlmeConfirm - Pointer to the confirm structure,
  *               containing confirm attributes.
  */
-static void MlmeConfirm( MlmeConfirm_t *MlmeConfirm )
+static void MlmeConfirm( MlmeConfirm_t *mlmeConfirm )
 {
-    if( MlmeConfirm->Status == LORAMAC_EVENT_INFO_STATUS_OK )
+    if( mlmeConfirm->Status == LORAMAC_EVENT_INFO_STATUS_OK )
     {
-        switch( MlmeConfirm->MlmeRequest )
+        switch( mlmeConfirm->MlmeRequest )
         {
             case MLME_JOIN:
             {
@@ -672,8 +686,8 @@
                 if( ComplianceTest.Running == true )
                 {
                     ComplianceTest.LinkCheck = true;
-                    ComplianceTest.DemodMargin = MlmeConfirm->DemodMargin;
-                    ComplianceTest.NbGateways = MlmeConfirm->NbGateways;
+                    ComplianceTest.DemodMargin = mlmeConfirm->DemodMargin;
+                    ComplianceTest.NbGateways = mlmeConfirm->NbGateways;
                 }
                 break;
             }
@@ -765,6 +779,17 @@
 #if defined( USE_BAND_868 )
                 LoRaMacTestSetDutyCycleOn( LORAWAN_DUTYCYCLE_ON );
                 SerialDisplayUpdateDutyCycle( LORAWAN_DUTYCYCLE_ON );
+
+#if( USE_SEMTECH_DEFAULT_CHANNEL_LINEUP == 1 ) 
+                LoRaMacChannelAdd( 3, ( ChannelParams_t )LC4 );
+                LoRaMacChannelAdd( 4, ( ChannelParams_t )LC5 );
+                LoRaMacChannelAdd( 5, ( ChannelParams_t )LC6 );
+                LoRaMacChannelAdd( 6, ( ChannelParams_t )LC7 );
+                LoRaMacChannelAdd( 7, ( ChannelParams_t )LC8 );
+                LoRaMacChannelAdd( 8, ( ChannelParams_t )LC9 );
+                LoRaMacChannelAdd( 9, ( ChannelParams_t )LC10 );
+#endif
+
 #endif
                 SerialDisplayUpdateActivationMode( OVER_THE_AIR_ACTIVATION );
                 SerialDisplayUpdateAdr( LORAWAN_ADR_ON );
@@ -847,8 +872,8 @@
                 }
                 if( ComplianceTest.Running == true )
                 {
-                    // Schedule next packet transmission as soon as possible
-                    TxDutyCycleTime = 1000; // 1 ms
+                    // Schedule next packet transmission
+                    TxDutyCycleTime = 5000000; // 5000000 us
                 }
                 else
                 {
@@ -860,11 +885,11 @@
             }
             case DEVICE_STATE_CYCLE:
             {
+                DeviceState = DEVICE_STATE_SLEEP;
+
                 // Schedule next packet transmission
                 TimerSetValue( &TxNextPacketTimer, TxDutyCycleTime );
                 TimerStart( &TxNextPacketTimer );
-
-                DeviceState = DEVICE_STATE_SLEEP;
                 break;
             }
             case DEVICE_STATE_SLEEP:
--- a/mac/LoRaWAN-lib.lib	Mon Mar 14 09:17:05 2016 +0000
+++ b/mac/LoRaWAN-lib.lib	Fri May 13 15:14:44 2016 +0000
@@ -1,1 +1,1 @@
-http://developer.mbed.org/teams/Semtech/code/LoRaWAN-lib/#b9d87593a8ae
+http://developer.mbed.org/teams/Semtech/code/LoRaWAN-lib/#37c12dbc8dc7
--- a/mbed.bld	Mon Mar 14 09:17:05 2016 +0000
+++ b/mbed.bld	Fri May 13 15:14:44 2016 +0000
@@ -1,1 +1,1 @@
-http://mbed.org/users/mbed_official/code/mbed/builds/252557024ec3
\ No newline at end of file
+http://mbed.org/users/mbed_official/code/mbed/builds/7c328cabac7e
\ No newline at end of file
--- a/radio/SX1272Lib.lib	Mon Mar 14 09:17:05 2016 +0000
+++ b/radio/SX1272Lib.lib	Fri May 13 15:14:44 2016 +0000
@@ -1,1 +1,1 @@
-http://developer.mbed.org/teams/Semtech/code/SX1272Lib/#5baff45eb3c5
+http://developer.mbed.org/teams/Semtech/code/SX1272Lib/#90bd79f1b458
--- a/system/crypto/aes.cpp	Mon Mar 14 09:17:05 2016 +0000
+++ b/system/crypto/aes.cpp	Fri May 13 15:14:44 2016 +0000
@@ -46,7 +46,7 @@
 #include <stdint.h>
 
 /* define if you have fast 32-bit types on your system */
-#if 1
+#if ( __CORTEX_M != 0 ) // if Cortex is different from M0/M0+
 #  define HAVE_UINT_32T
 #endif
 
@@ -239,7 +239,7 @@
 static uint8_t gf_inv(const uint8_t x)
 {   uint8_t p1 = x, p2 = BPOLY, n1 = hibit(x), n2 = 0x80, v1 = 1, v2 = 0;
 
-    if(x < 2) 
+    if(x < 2)
         return x;
 
     for( ; ; )
@@ -247,20 +247,20 @@
         if(n1)
             while(n2 >= n1)             /* divide polynomial p2 by p1    */
             {
-                n2 /= n1;               /* shift smaller polynomial left */ 
+                n2 /= n1;               /* shift smaller polynomial left */
                 p2 ^= (p1 * n2) & 0xff; /* and remove from larger one    */
-                v2 ^= (v1 * n2);        /* shift accumulated value and   */ 
+                v2 ^= (v1 * n2);        /* shift accumulated value and   */
                 n2 = hibit(p2);         /* add into result               */
             }
         else
             return v1;
 
-        if(n2)                          /* repeat with values swapped    */ 
+        if(n2)                          /* repeat with values swapped    */
             while(n1 >= n2)
             {
-                n1 /= n2; 
-                p1 ^= p2 * n1; 
-                v1 ^= v2 * n1; 
+                n1 /= n2;
+                p1 ^= p2 * n1;
+                v1 ^= v2 * n1;
                 n1 = hibit(p1);
             }
         else
@@ -270,13 +270,13 @@
 
 /* The forward and inverse affine transformations used in the S-box */
 uint8_t fwd_affine(const uint8_t x)
-{   
+{
 #if defined( HAVE_UINT_32T )
     uint32_t w = x;
     w ^= (w << 1) ^ (w << 2) ^ (w << 3) ^ (w << 4);
     return 0x63 ^ ((w ^ (w >> 8)) & 0xff);
 #else
-    return 0x63 ^ x ^ (x << 1) ^ (x << 2) ^ (x << 3) ^ (x << 4) 
+    return 0x63 ^ x ^ (x << 1) ^ (x << 2) ^ (x << 3) ^ (x << 4)
                     ^ (x >> 7) ^ (x >> 6) ^ (x >> 5) ^ (x >> 4);
 #endif
 }
@@ -288,7 +288,7 @@
     w = (w << 1) ^ (w << 3) ^ (w << 6);
     return 0x05 ^ ((w ^ (w >> 8)) & 0xff);
 #else
-    return 0x05 ^ (x << 1) ^ (x << 3) ^ (x << 6) 
+    return 0x05 ^ (x << 1) ^ (x << 3) ^ (x << 6)
                 ^ (x >> 7) ^ (x >> 5) ^ (x >> 2);
 #endif
 }
@@ -520,8 +520,8 @@
     case 24:
     case 32:
         break;
-    default: 
-        ctx->rnd = 0; 
+    default:
+        ctx->rnd = 0;
         return ( uint8_t )-1;
     }
     block_copy_nn(ctx->ksch, key, keylen);
@@ -648,10 +648,10 @@
 
 return_type aes_cbc_decrypt( const uint8_t *in, uint8_t *out,
                          int32_t n_block, uint8_t iv[N_BLOCK], const aes_context ctx[1] )
-{   
+{
     while(n_block--)
     {   uint8_t tmp[N_BLOCK];
-        
+
         //memcpy(tmp, in, N_BLOCK);
         block_copy(tmp, in);
         if(aes_decrypt(in, out, ctx) != EXIT_SUCCESS)
--- a/system/crypto/cmac.cpp	Mon Mar 14 09:17:05 2016 +0000
+++ b/system/crypto/cmac.cpp	Fri May 13 15:14:44 2016 +0000
@@ -86,7 +86,7 @@
                     len -= mlen;
             }
             while (len > 16) {      /* not last block */
-         
+
                     XOR(data, ctx->X);
                     //rijndael_encrypt(&ctx->rijndael, ctx->X, ctx->X);
 
@@ -119,7 +119,7 @@
             } else
                     LSHIFT(K, K);
 
-       
+
             if (ctx->M_n == 16) {
                     /* last block was a complete block */
                     XOR(K, ctx->M_last);
@@ -138,13 +138,13 @@
                          ctx->M_last[ctx->M_n] = 0;
    
                   XOR(K, ctx->M_last);
-          
-           
+
+
            }
            XOR(ctx->M_last, ctx->X);
-      
+
            //rijndael_encrypt(&ctx->rijndael, ctx->X, digest);
-    
+
        memcpy1(in, &ctx->X[0], 16); //Bestela ez du ondo iten
        aes_encrypt(in, digest, &ctx->rijndael);
            memset1(K, 0, sizeof K);
--- a/system/timer.cpp	Mon Mar 14 09:17:05 2016 +0000
+++ b/system/timer.cpp	Fri May 13 15:14:44 2016 +0000
@@ -40,6 +40,22 @@
     return ( ( TimerTime_t )CurrentTime );
 }
 
+TimerTime_t TimerGetElapsedTime( TimerTime_t savedTime )
+{
+    CurrentTime += TimeCounter.read_us( );
+    TimeCounter.reset( );
+    TimeCounter.start( );
+    return ( TimerTime_t )( CurrentTime - savedTime );
+}
+
+TimerTime_t TimerGetFutureTime( TimerTime_t eventInFuture )
+{
+    CurrentTime += TimeCounter.read_us( );
+    TimeCounter.reset( );
+    TimeCounter.start( );
+    return ( TimerTime_t )( CurrentTime + eventInFuture );
+}
+
 void TimerInit( TimerEvent_t *obj, void ( *callback )( void ) )
 {
     obj->value = 0;
--- a/system/timer.h	Mon Mar 14 09:17:05 2016 +0000
+++ b/system/timer.h	Fri May 13 15:14:44 2016 +0000
@@ -88,5 +88,20 @@
  */
 TimerTime_t TimerGetCurrentTime( void );
 
+/*!
+ * \brief Return the Time elapsed since a fix moment in Time
+ *
+ * \param [IN] savedTime    fix moment in Time
+ * \retval time             returns elapsed time
+ */
+TimerTime_t TimerGetElapsedTime( TimerTime_t savedTime );
+
+/*!
+ * \brief Return the Time elapsed since a fix moment in Time
+ *
+ * \param [IN] eventInFuture    fix moment in the future
+ * \retval time             returns difference between now and future event
+ */
+TimerTime_t TimerGetFutureTime( TimerTime_t eventInFuture );
 
 #endif // __TIMER_H__