Diff: sx1272/sx1272.cpp

Revision:

4:90bd79f1b458

Parent:

3:5baff45eb3c5

Child:

5:e90cbf646eb1

diff -r 5baff45eb3c5 -r 90bd79f1b458 sx1272/sx1272.cpp
--- a/sx1272/sx1272.cpp	Thu Mar 10 10:20:44 2016 +0000
+++ b/sx1272/sx1272.cpp	Fri May 13 14:49:34 2016 +0000
@@ -98,19 +98,19 @@
 bool SX1272::IsChannelFree( RadioModems_t modem, uint32_t freq, int16_t rssiThresh )
 {
     int16_t rssi = 0;
-    
+
     SetModem( modem );
 
     SetChannel( freq );
-    
+
     SetOpMode( RF_OPMODE_RECEIVER );
 
     wait_ms( 1 );
-    
+
     rssi = GetRssi( modem );
-    
+
     Sleep( );
-    
+
     if( rssi > rssiThresh )
     {
         return false;
@@ -124,7 +124,7 @@
     uint32_t rnd = 0;
 
     /*
-     * Radio setup for random number generation 
+     * Radio setup for random number generation
      */
     // Set LoRa modem ON
     SetModem( MODEM_LORA );
@@ -198,7 +198,7 @@
             this->settings.Fsk.IqInverted = iqInverted;
             this->settings.Fsk.RxContinuous = rxContinuous;
             this->settings.Fsk.PreambleLen = preambleLen;
-            
+
             datarate = ( uint16_t )( ( double )XTAL_FREQ / ( double )datarate );
             Write( REG_BITRATEMSB, ( uint8_t )( datarate >> 8 ) );
             Write( REG_BITRATELSB, ( uint8_t )( datarate & 0xFF ) );
@@ -208,18 +208,18 @@
 
             Write( REG_PREAMBLEMSB, ( uint8_t )( ( preambleLen >> 8 ) & 0xFF ) );
             Write( REG_PREAMBLELSB, ( uint8_t )( preambleLen & 0xFF ) );
-            
+
             if( fixLen == 1 )
             {
                 Write( REG_PAYLOADLENGTH, payloadLen );
             }
             else
             {
-                Write( REG_PAYLOADLENGTH, 0xFF ); // Set payload length to the maximum 
+                Write( REG_PAYLOADLENGTH, 0xFF ); // Set payload length to the maximum
             }
             
             Write( REG_PACKETCONFIG1,
-                         ( Read( REG_PACKETCONFIG1 ) & 
+                         ( Read( REG_PACKETCONFIG1 ) &
                            RF_PACKETCONFIG1_CRC_MASK &
                            RF_PACKETCONFIG1_PACKETFORMAT_MASK ) |
                            ( ( fixLen == 1 ) ? RF_PACKETCONFIG1_PACKETFORMAT_FIXED : RF_PACKETCONFIG1_PACKETFORMAT_VARIABLE ) |
@@ -248,7 +248,7 @@
             {
                 datarate = 6;
             }
-        
+
             if( ( ( bandwidth == 0 ) && ( ( datarate == 11 ) || ( datarate == 12 ) ) ) ||
                 ( ( bandwidth == 1 ) && ( datarate == 12 ) ) )
             {
@@ -259,14 +259,14 @@
                 this->settings.LoRa.LowDatarateOptimize = 0x00;
             }
 
-            Write( REG_LR_MODEMCONFIG1, 
+            Write( REG_LR_MODEMCONFIG1,
                          ( Read( REG_LR_MODEMCONFIG1 ) &
                            RFLR_MODEMCONFIG1_BW_MASK &
                            RFLR_MODEMCONFIG1_CODINGRATE_MASK &
                            RFLR_MODEMCONFIG1_IMPLICITHEADER_MASK &
                            RFLR_MODEMCONFIG1_RXPAYLOADCRC_MASK &
                            RFLR_MODEMCONFIG1_LOWDATARATEOPTIMIZE_MASK ) |
-                           ( bandwidth << 6 ) | ( coderate << 3 ) | 
+                           ( bandwidth << 6 ) | ( coderate << 3 ) |
                            ( fixLen << 2 ) | ( crcOn << 1 ) |
                            this->settings.LoRa.LowDatarateOptimize );
 
@@ -278,7 +278,7 @@
                            ( ( symbTimeout >> 8 ) & ~RFLR_MODEMCONFIG2_SYMBTIMEOUTMSB_MASK ) );
 
             Write( REG_LR_SYMBTIMEOUTLSB, ( uint8_t )( symbTimeout & 0xFF ) );
-            
+
             Write( REG_LR_PREAMBLEMSB, ( uint8_t )( ( preambleLen >> 8 ) & 0xFF ) );
             Write( REG_LR_PREAMBLELSB, ( uint8_t )( preambleLen & 0xFF ) );
 
@@ -295,11 +295,11 @@
 
             if( datarate == 6 )
             {
-                Write( REG_LR_DETECTOPTIMIZE, 
+                Write( REG_LR_DETECTOPTIMIZE,
                              ( Read( REG_LR_DETECTOPTIMIZE ) &
                                RFLR_DETECTIONOPTIMIZE_MASK ) |
                                RFLR_DETECTIONOPTIMIZE_SF6 );
-                Write( REG_LR_DETECTIONTHRESHOLD, 
+                Write( REG_LR_DETECTIONTHRESHOLD,
                              RFLR_DETECTIONTHRESH_SF6 );
             }
             else
@@ -308,7 +308,7 @@
                              ( Read( REG_LR_DETECTOPTIMIZE ) &
                              RFLR_DETECTIONOPTIMIZE_MASK ) |
                              RFLR_DETECTIONOPTIMIZE_SF7_TO_SF12 );
-                Write( REG_LR_DETECTIONTHRESHOLD, 
+                Write( REG_LR_DETECTIONTHRESHOLD,
                              RFLR_DETECTIONTHRESH_SF7_TO_SF12 );
             }
         }
@@ -342,17 +342,17 @@
 static const uint8_t RfoTable[11] = { 1, 1, 1, 2, 2, 3, 4, 5, 6, 8, 9 };
 #endif
 
-void SX1272::SetTxConfig( RadioModems_t modem, int8_t power, uint32_t fdev, 
+void SX1272::SetTxConfig( RadioModems_t modem, int8_t power, uint32_t fdev,
                         uint32_t bandwidth, uint32_t datarate,
                         uint8_t coderate, uint16_t preambleLen,
-                        bool fixLen, bool crcOn, bool freqHopOn, 
+                        bool fixLen, bool crcOn, bool freqHopOn,
                         uint8_t hopPeriod, bool iqInverted, uint32_t timeout )
 {
     uint8_t paConfig = 0;
     uint8_t paDac = 0;
 
     SetModem( modem );
-    
+
     paConfig = Read( REG_PACONFIG );
     paDac = Read( REG_PADAC );
 
@@ -418,7 +418,6 @@
         paConfig = ( paConfig & RFLR_PACONFIG_OUTPUTPOWER_MASK ) | ( uint8_t )( ( uint16_t )( power + 1 ) & 0x0F );
     }
 #endif
-
     Write( REG_PACONFIG, paConfig );
     Write( REG_PADAC, paDac );
 
@@ -435,7 +434,7 @@
             this->settings.Fsk.CrcOn = crcOn;
             this->settings.Fsk.IqInverted = iqInverted;
             this->settings.Fsk.TxTimeout = timeout;
-            
+
             fdev = ( uint16_t )( ( double )fdev / ( double )FREQ_STEP );
             Write( REG_FDEVMSB, ( uint8_t )( fdev >> 8 ) );
             Write( REG_FDEVLSB, ( uint8_t )( fdev & 0xFF ) );
@@ -448,12 +447,12 @@
             Write( REG_PREAMBLELSB, preambleLen & 0xFF );
 
             Write( REG_PACKETCONFIG1,
-                         ( Read( REG_PACKETCONFIG1 ) & 
+                         ( Read( REG_PACKETCONFIG1 ) &
                            RF_PACKETCONFIG1_CRC_MASK &
                            RF_PACKETCONFIG1_PACKETFORMAT_MASK ) |
                            ( ( fixLen == 1 ) ? RF_PACKETCONFIG1_PACKETFORMAT_FIXED : RF_PACKETCONFIG1_PACKETFORMAT_VARIABLE ) |
                            ( crcOn << 4 ) );
-        
+
         }
         break;
     case MODEM_LORA:
@@ -494,14 +493,14 @@
                 Write( REG_LR_HOPPERIOD, this->settings.LoRa.HopPeriod );
             }
 
-            Write( REG_LR_MODEMCONFIG1, 
+            Write( REG_LR_MODEMCONFIG1,
                          ( Read( REG_LR_MODEMCONFIG1 ) &
                            RFLR_MODEMCONFIG1_BW_MASK &
                            RFLR_MODEMCONFIG1_CODINGRATE_MASK &
                            RFLR_MODEMCONFIG1_IMPLICITHEADER_MASK &
                            RFLR_MODEMCONFIG1_RXPAYLOADCRC_MASK &
                            RFLR_MODEMCONFIG1_LOWDATARATEOPTIMIZE_MASK ) |
-                           ( bandwidth << 6 ) | ( coderate << 3 ) | 
+                           ( bandwidth << 6 ) | ( coderate << 3 ) |
                            ( fixLen << 2 ) | ( crcOn << 1 ) |
                            this->settings.LoRa.LowDatarateOptimize );
 
@@ -510,17 +509,17 @@
                           RFLR_MODEMCONFIG2_SF_MASK ) |
                           ( datarate << 4 ) );
 
-        
+
             Write( REG_LR_PREAMBLEMSB, ( preambleLen >> 8 ) & 0x00FF );
             Write( REG_LR_PREAMBLELSB, preambleLen & 0xFF );
-            
+
             if( datarate == 6 )
             {
-                Write( REG_LR_DETECTOPTIMIZE, 
+                Write( REG_LR_DETECTOPTIMIZE,
                              ( Read( REG_LR_DETECTOPTIMIZE ) &
                                RFLR_DETECTIONOPTIMIZE_MASK ) |
                                RFLR_DETECTIONOPTIMIZE_SF6 );
-                Write( REG_LR_DETECTIONTHRESHOLD, 
+                Write( REG_LR_DETECTIONTHRESHOLD,
                              RFLR_DETECTIONTHRESH_SF6 );
             }
             else
@@ -529,7 +528,7 @@
                              ( Read( REG_LR_DETECTOPTIMIZE ) &
                              RFLR_DETECTIONOPTIMIZE_MASK ) |
                              RFLR_DETECTIONOPTIMIZE_SF7_TO_SF12 );
-                Write( REG_LR_DETECTIONTHRESHOLD, 
+                Write( REG_LR_DETECTIONTHRESHOLD,
                              RFLR_DETECTIONTHRESH_SF7_TO_SF12 );
             }
         }
@@ -584,7 +583,7 @@
                                  ( this->settings.LoRa.Coderate + 4 );
             double nPayload = 8 + ( ( tmp > 0 ) ? tmp : 0 );
             double tPayload = nPayload * ts;
-            // Time on air 
+            // Time on air
             double tOnAir = tPreamble + tPayload;
             // return us secs
             airTime = floor( tOnAir * 1e6 + 0.999 );
@@ -612,8 +611,8 @@
             else
             {
                 Write( REG_PAYLOADLENGTH, size );
-            }            
-            
+            }
+
             if( ( size > 0 ) && ( size <= 64 ) )
             {
                 this->settings.FskPacketHandler.ChunkSize = size;
@@ -641,14 +640,14 @@
             {
                 Write( REG_LR_INVERTIQ, ( ( Read( REG_LR_INVERTIQ ) & RFLR_INVERTIQ_TX_MASK & RFLR_INVERTIQ_RX_MASK ) | RFLR_INVERTIQ_RX_OFF | RFLR_INVERTIQ_TX_OFF ) );
                 Write( REG_LR_INVERTIQ2, RFLR_INVERTIQ2_OFF );
-            }      
-        
+            }
+
             this->settings.LoRaPacketHandler.Size = size;
 
             // Initializes the payload size
             Write( REG_LR_PAYLOADLENGTH, size );
 
-            // Full buffer used for Tx            
+            // Full buffer used for Tx
             Write( REG_LR_FIFOTXBASEADDR, 0 );
             Write( REG_LR_FIFOADDRPTR, 0 );
 
@@ -695,7 +694,7 @@
     case MODEM_FSK:
         {
             rxContinuous = this->settings.Fsk.RxContinuous;
-            
+
             // DIO0=PayloadReady
             // DIO1=FifoLevel
             // DIO2=SyncAddr
@@ -706,15 +705,18 @@
                                                                             RF_DIOMAPPING1_DIO1_MASK &
                                                                             RF_DIOMAPPING1_DIO2_MASK ) |
                                                                             RF_DIOMAPPING1_DIO0_00 |
+                                                                            RF_DIOMAPPING1_DIO1_00 |
                                                                             RF_DIOMAPPING1_DIO2_11 );
-            
+
             Write( REG_DIOMAPPING2, ( Read( REG_DIOMAPPING2 ) & RF_DIOMAPPING2_DIO4_MASK &
-                                                                            RF_DIOMAPPING2_MAP_MASK ) | 
+                                                                            RF_DIOMAPPING2_MAP_MASK ) |
                                                                             RF_DIOMAPPING2_DIO4_11 |
                                                                             RF_DIOMAPPING2_MAP_PREAMBLEDETECT );
-            
+
             this->settings.FskPacketHandler.FifoThresh = Read( REG_FIFOTHRESH ) & 0x3F;
-            
+
+            Write( REG_RXCONFIG, RF_RXCONFIG_AFCAUTO_ON | RF_RXCONFIG_AGCAUTO_ON | RF_RXCONFIG_RXTRIGER_PREAMBLEDETECT );
+
             this->settings.FskPacketHandler.PreambleDetected = false;
             this->settings.FskPacketHandler.SyncWordDetected = false;
             this->settings.FskPacketHandler.NbBytes = 0;
@@ -732,10 +734,10 @@
             {
                 Write( REG_LR_INVERTIQ, ( ( Read( REG_LR_INVERTIQ ) & RFLR_INVERTIQ_TX_MASK & RFLR_INVERTIQ_RX_MASK ) | RFLR_INVERTIQ_RX_OFF | RFLR_INVERTIQ_TX_OFF ) );
                 Write( REG_LR_INVERTIQ2, RFLR_INVERTIQ2_OFF );
-            }         
-        
+            }
+
             rxContinuous = this->settings.LoRa.RxContinuous;
-            
+
             if( this->settings.LoRa.FreqHopOn == true )
             {
                 Write( REG_LR_IRQFLAGSMASK, //RFLR_IRQFLAGS_RXTIMEOUT |
@@ -746,7 +748,7 @@
                                                   RFLR_IRQFLAGS_CADDONE |
                                                   //RFLR_IRQFLAGS_FHSSCHANGEDCHANNEL |
                                                   RFLR_IRQFLAGS_CADDETECTED );
-                                              
+
                 // DIO0=RxDone, DIO2=FhssChangeChannel
                 Write( REG_DIOMAPPING1, ( Read( REG_DIOMAPPING1 ) & RFLR_DIOMAPPING1_DIO0_MASK & RFLR_DIOMAPPING1_DIO2_MASK  ) | RFLR_DIOMAPPING1_DIO0_00 | RFLR_DIOMAPPING1_DIO2_00 );
             }
@@ -760,7 +762,7 @@
                                                   RFLR_IRQFLAGS_CADDONE |
                                                   RFLR_IRQFLAGS_FHSSCHANGEDCHANNEL |
                                                   RFLR_IRQFLAGS_CADDETECTED );
-                                              
+
                 // DIO0=RxDone
                 Write( REG_DIOMAPPING1, ( Read( REG_DIOMAPPING1 ) & RFLR_DIOMAPPING1_DIO0_MASK ) | RFLR_DIOMAPPING1_DIO0_00 );
             }
@@ -781,14 +783,14 @@
     if( this->settings.Modem == MODEM_FSK )
     {
         SetOpMode( RF_OPMODE_RECEIVER );
-        
+
         if( rxContinuous == false )
         {
-            rxTimeoutSyncWord.attach_us( this, &SX1272::OnTimeoutIrq, ( 8.0 * ( this->settings.Fsk.PreambleLen +
-                                                         ( ( Read( REG_SYNCCONFIG ) &
-                                                            ~RF_SYNCCONFIG_SYNCSIZE_MASK ) +
-                                                         1.0 ) + 10.0 ) /
-                                                        ( double )this->settings.Fsk.Datarate ) * 1e6 );
+            rxTimeoutSyncWord.attach_us( this, &SX1272::OnTimeoutIrq, ceil( ( 8.0 * ( this->settings.Fsk.PreambleLen +
+                                                             ( ( Read( REG_SYNCCONFIG ) &
+                                                                ~RF_SYNCCONFIG_SYNCSIZE_MASK ) +
+                                                                1.0 ) + 10.0 ) /
+                                                             ( double )this->settings.Fsk.Datarate ) * 1e6 ) + 4000 );
         }
     }
     else
@@ -818,8 +820,9 @@
             // DIO4=LowBat
             // DIO5=ModeReady
             Write( REG_DIOMAPPING1, ( Read( REG_DIOMAPPING1 ) & RF_DIOMAPPING1_DIO0_MASK &
-                                                                RF_DIOMAPPING1_DIO2_MASK ) |
-                                                                RF_DIOMAPPING1_DIO1_01 );
+                                                                            RF_DIOMAPPING1_DIO1_MASK &
+                                                                            RF_DIOMAPPING1_DIO2_MASK ) |
+                                                                            RF_DIOMAPPING1_DIO1_01 );
 
             Write( REG_DIOMAPPING2, ( Read( REG_DIOMAPPING2 ) & RF_DIOMAPPING2_DIO4_MASK &
                                                                             RF_DIOMAPPING2_MAP_MASK ) );
@@ -838,7 +841,7 @@
                                                   RFLR_IRQFLAGS_CADDONE |
                                                   //RFLR_IRQFLAGS_FHSSCHANGEDCHANNEL |
                                                   RFLR_IRQFLAGS_CADDETECTED );
-                                              
+
                 // DIO0=TxDone, DIO2=FhssChangeChannel
                 Write( REG_DIOMAPPING1, ( Read( REG_DIOMAPPING1 ) & RFLR_DIOMAPPING1_DIO0_MASK & RFLR_DIOMAPPING1_DIO2_MASK ) | RFLR_DIOMAPPING1_DIO0_01 | RFLR_DIOMAPPING1_DIO2_00 );
             }
@@ -871,7 +874,7 @@
     {
     case MODEM_FSK:
         {
-           
+
         }
         break;
     case MODEM_LORA:
@@ -883,12 +886,12 @@
                                         RFLR_IRQFLAGS_TXDONE |
                                         //RFLR_IRQFLAGS_CADDONE |
                                         RFLR_IRQFLAGS_FHSSCHANGEDCHANNEL // |
-                                        //RFLR_IRQFLAGS_CADDETECTED 
+                                        //RFLR_IRQFLAGS_CADDETECTED
                                         );
-                                          
+
             // DIO3=CADDone
             Write( REG_DIOMAPPING1, ( Read( REG_DIOMAPPING1 ) & RFLR_DIOMAPPING1_DIO0_MASK ) | RFLR_DIOMAPPING1_DIO0_00 );
-            
+
             this->settings.State = RF_CAD;
             SetOpMode( RFLR_OPMODE_CAD );
         }
@@ -919,27 +922,23 @@
 
 void SX1272::SetOpMode( uint8_t opMode )
 {
-    if( opMode != currentOpMode )
+    if( opMode == RF_OPMODE_SLEEP )
     {
-        currentOpMode = opMode;
-        if( opMode == RF_OPMODE_SLEEP )
+        SetAntSwLowPower( true );
+    }
+    else
+    {
+        SetAntSwLowPower( false );
+        if( opMode == RF_OPMODE_TRANSMITTER )
         {
-            SetAntSwLowPower( true );
+            SetAntSw( 1 );
         }
         else
         {
-            SetAntSwLowPower( false );
-            if( opMode == RF_OPMODE_TRANSMITTER )
-            {
-                 SetAntSw( 1 );
-            }
-            else
-            {
-                 SetAntSw( 0 );
-            }
+            SetAntSw( 0 );
         }
-        Write( REG_OPMODE, ( Read( REG_OPMODE ) & RF_OPMODE_MASK ) | opMode );
     }
+    Write( REG_OPMODE, ( Read( REG_OPMODE ) & RF_OPMODE_MASK ) | opMode );
 }
 
 void SX1272::SetModem( RadioModems_t modem )
@@ -1001,7 +1000,7 @@
             this->settings.FskPacketHandler.Size = 0;
 
             // Clear Irqs
-            Write( REG_IRQFLAGS1, RF_IRQFLAGS1_RSSI | 
+            Write( REG_IRQFLAGS1, RF_IRQFLAGS1_RSSI |
                                         RF_IRQFLAGS1_PREAMBLEDETECT |
                                         RF_IRQFLAGS1_SYNCADDRESSMATCH );
             Write( REG_IRQFLAGS2, RF_IRQFLAGS2_FIFOOVERRUN );
@@ -1010,6 +1009,11 @@
             {
                 // Continuous mode restart Rx chain
                 Write( REG_RXCONFIG, Read( REG_RXCONFIG ) | RF_RXCONFIG_RESTARTRXWITHOUTPLLLOCK );
+                rxTimeoutSyncWord.attach_us( this, &SX1272::OnTimeoutIrq, ceil( ( 8.0 * ( this->settings.Fsk.PreambleLen +
+                                                             ( ( Read( REG_SYNCCONFIG ) &
+                                                                ~RF_SYNCCONFIG_SYNCSIZE_MASK ) +
+                                                             1.0 ) + 10.0 ) /
+                                                            ( double )this->settings.Fsk.Datarate ) * 1e6 ) + 4000 );
             }
             else
             {
@@ -1039,7 +1043,7 @@
     volatile uint8_t irqFlags = 0;
 
     switch( this->settings.State )
-    {                
+    {
         case RF_RX_RUNNING:
             //TimerStop( &RxTimeoutTimer );
             // RxDone interrupt
@@ -1052,27 +1056,30 @@
                     if( ( irqFlags & RF_IRQFLAGS2_CRCOK ) != RF_IRQFLAGS2_CRCOK )
                     {
                         // Clear Irqs
-                        Write( REG_IRQFLAGS1, RF_IRQFLAGS1_RSSI | 
+                        Write( REG_IRQFLAGS1, RF_IRQFLAGS1_RSSI |
                                                     RF_IRQFLAGS1_PREAMBLEDETECT |
                                                     RF_IRQFLAGS1_SYNCADDRESSMATCH );
                         Write( REG_IRQFLAGS2, RF_IRQFLAGS2_FIFOOVERRUN );
-    
+
+                        rxTimeoutTimer.detach( );
+
                         if( this->settings.Fsk.RxContinuous == false )
                         {
+                            rxTimeoutSyncWord.detach( );
                             this->settings.State = RF_IDLE;
-                            rxTimeoutSyncWord.attach_us( this, &SX1272::OnTimeoutIrq, (  8.0 * ( this->settings.Fsk.PreambleLen +
-                                                             ( ( Read( REG_SYNCCONFIG ) &
-                                                                ~RF_SYNCCONFIG_SYNCSIZE_MASK ) +
-                                                             1.0 ) + 10.0 ) /
-                                                            ( double )this->settings.Fsk.Datarate ) * 1e6 ) ;
                         }
                         else
                         {
                             // Continuous mode restart Rx chain
                             Write( REG_RXCONFIG, Read( REG_RXCONFIG ) | RF_RXCONFIG_RESTARTRXWITHOUTPLLLOCK );
+                            rxTimeoutSyncWord.attach_us( this, &SX1272::OnTimeoutIrq, ceil( ( 8.0 * ( this->settings.Fsk.PreambleLen +
+                                                                         ( ( Read( REG_SYNCCONFIG ) &
+                                                                            ~RF_SYNCCONFIG_SYNCSIZE_MASK ) +
+                                                                         1.0 ) + 10.0 ) /
+                                                                        ( double )this->settings.Fsk.Datarate ) * 1e6 ) + 4000 );
                         }
-                        rxTimeoutTimer.detach( );
-    
+
+
                         if( ( this->RadioEvents != NULL ) && ( this->RadioEvents->RxError != NULL ) )
                         {
                             this->RadioEvents->RxError( );
@@ -1105,26 +1112,28 @@
                     this->settings.FskPacketHandler.NbBytes += ( this->settings.FskPacketHandler.Size - this->settings.FskPacketHandler.NbBytes );
                 }
 
+                rxTimeoutTimer.detach( );
+
                 if( this->settings.Fsk.RxContinuous == false )
                 {
                     this->settings.State = RF_IDLE;
-                    rxTimeoutSyncWord.attach_us( this, &SX1272::OnTimeoutIrq, ( 8.0 * ( this->settings.Fsk.PreambleLen +
-                                                         ( ( Read( REG_SYNCCONFIG ) &
-                                                            ~RF_SYNCCONFIG_SYNCSIZE_MASK ) +
-                                                         1.0 ) + 10.0 ) /
-                                                        ( double )this->settings.Fsk.Datarate ) * 1e6 ) ;
+                    rxTimeoutSyncWord.detach( );
                 }
                 else
                 {
                     // Continuous mode restart Rx chain
                     Write( REG_RXCONFIG, Read( REG_RXCONFIG ) | RF_RXCONFIG_RESTARTRXWITHOUTPLLLOCK );
+                    rxTimeoutSyncWord.attach_us( this, &SX1272::OnTimeoutIrq, ceil( ( 8.0 * ( this->settings.Fsk.PreambleLen +
+                                                                 ( ( Read( REG_SYNCCONFIG ) &
+                                                                    ~RF_SYNCCONFIG_SYNCSIZE_MASK ) +
+                                                                 1.0 ) + 10.0 ) /
+                                                                ( double )this->settings.Fsk.Datarate ) * 1e6 ) + 4000 );
                 }
-                rxTimeoutTimer.detach( );
 
                 if( ( this->RadioEvents != NULL ) && ( this->RadioEvents->RxDone != NULL ) )
                 {
-                    this->RadioEvents->RxDone( rxtxBuffer, this->settings.FskPacketHandler.Size, this->settings.FskPacketHandler.RssiValue, 0 ); 
-                } 
+                    this->RadioEvents->RxDone( rxtxBuffer, this->settings.FskPacketHandler.Size, this->settings.FskPacketHandler.RssiValue, 0 );
+                }
                 this->settings.FskPacketHandler.PreambleDetected = false;
                 this->settings.FskPacketHandler.SyncWordDetected = false;
                 this->settings.FskPacketHandler.NbBytes = 0;
@@ -1176,13 +1185,13 @@
                                                                       snr;
                     }
                     else
-                    {    
+                    {
                         this->settings.LoRaPacketHandler.RssiValue = RSSI_OFFSET + rssi + ( rssi >> 4 );
                     }
 
                     this->settings.LoRaPacketHandler.Size = Read( REG_LR_RXNBBYTES );
                     ReadFifo( rxtxBuffer, this->settings.LoRaPacketHandler.Size );
-                
+
                     if( this->settings.LoRa.RxContinuous == false )
                     {
                         this->settings.State = RF_IDLE;
@@ -1200,7 +1209,7 @@
             }
             break;
         case RF_TX_RUNNING:
-            txTimeoutTimer.detach(  );
+            txTimeoutTimer.detach( );
             // TxDone interrupt
             switch( this->settings.Modem )
             {
@@ -1214,7 +1223,7 @@
                 if( ( this->RadioEvents != NULL ) && ( this->RadioEvents->TxDone != NULL ) )
                 {
                     this->RadioEvents->TxDone( );
-                } 
+                }
                 break;
             }
             break;
@@ -1226,7 +1235,7 @@
 void SX1272::OnDio1Irq( void )
 {
     switch( this->settings.State )
-    {                
+    {
         case RF_RX_RUNNING:
             switch( this->settings.Modem )
             {
@@ -1273,13 +1282,13 @@
             switch( this->settings.Modem )
             {
             case MODEM_FSK:
-                // FifoLevel interrupt
+                // FifoEmpty interrupt
                 if( ( this->settings.FskPacketHandler.Size - this->settings.FskPacketHandler.NbBytes ) > this->settings.FskPacketHandler.ChunkSize )
                 {
                     WriteFifo( ( rxtxBuffer + this->settings.FskPacketHandler.NbBytes ), this->settings.FskPacketHandler.ChunkSize );
                     this->settings.FskPacketHandler.NbBytes += this->settings.FskPacketHandler.ChunkSize;
                 }
-                else 
+                else
                 {
                     // Write the last chunk of data
                     WriteFifo( rxtxBuffer + this->settings.FskPacketHandler.NbBytes, this->settings.FskPacketHandler.Size - this->settings.FskPacketHandler.NbBytes );
@@ -1300,7 +1309,7 @@
 void SX1272::OnDio2Irq( void )
 {
     switch( this->settings.State )
-    {                
+    {
         case RF_RX_RUNNING:
             switch( this->settings.Modem )
             {
@@ -1308,9 +1317,9 @@
                 if( ( this->settings.FskPacketHandler.PreambleDetected == true ) && ( this->settings.FskPacketHandler.SyncWordDetected == false ) )
                 {
                     rxTimeoutSyncWord.detach( );
-                    
+
                     this->settings.FskPacketHandler.SyncWordDetected = true;
-                
+
                     this->settings.FskPacketHandler.RssiValue = -( Read( REG_RSSIVALUE ) >> 1 );
 
                     this->settings.FskPacketHandler.AfcValue = ( int32_t )( double )( ( ( uint16_t )Read( REG_AFCMSB ) << 8 ) |
@@ -1324,7 +1333,7 @@
                 {
                     // Clear Irq
                     Write( REG_LR_IRQFLAGS, RFLR_IRQFLAGS_FHSSCHANGEDCHANNEL );
-                    
+
                     if( ( this->RadioEvents != NULL ) && ( this->RadioEvents->FhssChangeChannel != NULL ) )
                     {
                         this->RadioEvents->FhssChangeChannel( ( Read( REG_LR_HOPCHANNEL ) & RFLR_HOPCHANNEL_CHANNEL_MASK ) );
@@ -1345,7 +1354,7 @@
                 {
                     // Clear Irq
                     Write( REG_LR_IRQFLAGS, RFLR_IRQFLAGS_FHSSCHANGEDCHANNEL );
-                    
+
                     if( ( this->RadioEvents != NULL ) && ( this->RadioEvents->FhssChangeChannel != NULL ) )
                     {
                         this->RadioEvents->FhssChangeChannel( ( Read( REG_LR_HOPCHANNEL ) & RFLR_HOPCHANNEL_CHANNEL_MASK ) );
@@ -1378,7 +1387,7 @@
             }
         }
         else
-        {        
+        {
             // Clear Irq
             Write( REG_LR_IRQFLAGS, RFLR_IRQFLAGS_CADDONE );
             if( ( this->RadioEvents != NULL ) && ( this->RadioEvents->CadDone != NULL ) )
@@ -1401,7 +1410,7 @@
             if( this->settings.FskPacketHandler.PreambleDetected == false )
             {
                 this->settings.FskPacketHandler.PreambleDetected = true;
-            }    
+            }
         }
         break;
     case MODEM_LORA: