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363 lines
11 KiB
363 lines
11 KiB
7 years ago
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/*
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/ _____) _ | |
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( (____ _____ ____ _| |_ _____ ____| |__
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\____ \| ___ | (_ _) ___ |/ ___) _ \
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_____) ) ____| | | || |_| ____( (___| | | |
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(______/|_____)_|_|_| \__)_____)\____)_| |_|
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(C)2013 Semtech
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___ _____ _ ___ _ _____ ___ ___ ___ ___
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/ __|_ _/_\ / __| |/ / __/ _ \| _ \/ __| __|
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\__ \ | |/ _ \ (__| ' <| _| (_) | / (__| _|
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|___/ |_/_/ \_\___|_|\_\_| \___/|_|_\\___|___|
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embedded.connectivity.solutions===============
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Description: LoRa MAC common region implementation
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License: Revised BSD License, see LICENSE.TXT file include in the project
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Maintainer: Miguel Luis ( Semtech ), Gregory Cristian ( Semtech ) and Daniel Jaeckle ( STACKFORCE )
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*/
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#include <stdbool.h>
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#include <string.h>
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#include <stdint.h>
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#include <math.h>
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#include "timer.h"
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#include "utilities.h"
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#include "LoRaMac.h"
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#include "RegionCommon.h"
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#define BACKOFF_DC_1_HOUR 100
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#define BACKOFF_DC_10_HOURS 1000
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#define BACKOFF_DC_24_HOURS 10000
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static uint8_t CountChannels( uint16_t mask, uint8_t nbBits )
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{
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uint8_t nbActiveBits = 0;
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for( uint8_t j = 0; j < nbBits; j++ )
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{
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if( ( mask & ( 1 << j ) ) == ( 1 << j ) )
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{
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nbActiveBits++;
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}
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}
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return nbActiveBits;
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}
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uint16_t RegionCommonGetJoinDc( TimerTime_t elapsedTime )
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{
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uint16_t dutyCycle = 0;
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if( elapsedTime < 3600000 )
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{
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dutyCycle = BACKOFF_DC_1_HOUR;
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}
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else if( elapsedTime < ( 3600000 + 36000000 ) )
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{
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dutyCycle = BACKOFF_DC_10_HOURS;
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}
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else
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{
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dutyCycle = BACKOFF_DC_24_HOURS;
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}
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return dutyCycle;
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}
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bool RegionCommonChanVerifyDr( uint8_t nbChannels, uint16_t* channelsMask, int8_t dr, int8_t minDr, int8_t maxDr, ChannelParams_t* channels )
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{
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if( RegionCommonValueInRange( dr, minDr, maxDr ) == 0 )
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{
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return false;
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}
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for( uint8_t i = 0, k = 0; i < nbChannels; i += 16, k++ )
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{
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for( uint8_t j = 0; j < 16; j++ )
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{
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if( ( ( channelsMask[k] & ( 1 << j ) ) != 0 ) )
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{// Check datarate validity for enabled channels
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if( RegionCommonValueInRange( dr, ( channels[i + j].DrRange.Fields.Min & 0x0F ),
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( channels[i + j].DrRange.Fields.Max & 0x0F ) ) == 1 )
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{
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// At least 1 channel has been found we can return OK.
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return true;
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}
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}
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}
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}
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return false;
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}
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uint8_t RegionCommonValueInRange( int8_t value, int8_t min, int8_t max )
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{
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if( ( value >= min ) && ( value <= max ) )
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{
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return 1;
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}
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return 0;
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}
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bool RegionCommonChanDisable( uint16_t* channelsMask, uint8_t id, uint8_t maxChannels )
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{
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uint8_t index = id / 16;
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if( ( index > ( maxChannels / 16 ) ) || ( id >= maxChannels ) )
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{
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return false;
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}
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// Deactivate channel
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channelsMask[index] &= ~( 1 << ( id % 16 ) );
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return true;
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}
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uint8_t RegionCommonCountChannels( uint16_t* channelsMask, uint8_t startIdx, uint8_t stopIdx )
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{
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uint8_t nbChannels = 0;
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if( channelsMask == NULL )
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{
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return 0;
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}
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for( uint8_t i = startIdx; i < stopIdx; i++ )
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{
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nbChannels += CountChannels( channelsMask[i], 16 );
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}
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return nbChannels;
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}
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void RegionCommonChanMaskCopy( uint16_t* channelsMaskDest, uint16_t* channelsMaskSrc, uint8_t len )
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{
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if( ( channelsMaskDest != NULL ) && ( channelsMaskSrc != NULL ) )
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{
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for( uint8_t i = 0; i < len; i++ )
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{
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channelsMaskDest[i] = channelsMaskSrc[i];
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}
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}
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}
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void RegionCommonSetBandTxDone( bool joined, Band_t* band, TimerTime_t lastTxDone )
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{
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if( joined == true )
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{
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band->LastTxDoneTime = lastTxDone;
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}
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else
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{
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band->LastTxDoneTime = lastTxDone;
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band->LastJoinTxDoneTime = lastTxDone;
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}
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}
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TimerTime_t RegionCommonUpdateBandTimeOff( bool joined, bool dutyCycle, Band_t* bands, uint8_t nbBands )
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{
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TimerTime_t nextTxDelay = ( TimerTime_t )( -1 );
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// Update bands Time OFF
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for( uint8_t i = 0; i < nbBands; i++ )
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{
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if( joined == false )
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{
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uint32_t txDoneTime = MAX( TimerGetElapsedTime( bands[i].LastJoinTxDoneTime ),
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( dutyCycle == true ) ? TimerGetElapsedTime( bands[i].LastTxDoneTime ) : 0 );
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if( bands[i].TimeOff <= txDoneTime )
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{
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bands[i].TimeOff = 0;
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}
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if( bands[i].TimeOff != 0 )
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{
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nextTxDelay = MIN( bands[i].TimeOff - txDoneTime, nextTxDelay );
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}
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}
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else
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{
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if( dutyCycle == true )
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{
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if( bands[i].TimeOff <= TimerGetElapsedTime( bands[i].LastTxDoneTime ) )
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{
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bands[i].TimeOff = 0;
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}
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if( bands[i].TimeOff != 0 )
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{
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nextTxDelay = MIN( bands[i].TimeOff - TimerGetElapsedTime( bands[i].LastTxDoneTime ),
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nextTxDelay );
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}
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}
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else
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{
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nextTxDelay = 0;
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bands[i].TimeOff = 0;
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}
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}
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}
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return nextTxDelay;
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}
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uint8_t RegionCommonParseLinkAdrReq( uint8_t* payload, RegionCommonLinkAdrParams_t* linkAdrParams )
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{
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uint8_t retIndex = 0;
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if( payload[0] == SRV_MAC_LINK_ADR_REQ )
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{
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// Parse datarate and tx power
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linkAdrParams->Datarate = payload[1];
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linkAdrParams->TxPower = linkAdrParams->Datarate & 0x0F;
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linkAdrParams->Datarate = ( linkAdrParams->Datarate >> 4 ) & 0x0F;
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// Parse ChMask
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linkAdrParams->ChMask = ( uint16_t )payload[2];
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linkAdrParams->ChMask |= ( uint16_t )payload[3] << 8;
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// Parse ChMaskCtrl and nbRep
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linkAdrParams->NbRep = payload[4];
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linkAdrParams->ChMaskCtrl = ( linkAdrParams->NbRep >> 4 ) & 0x07;
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linkAdrParams->NbRep &= 0x0F;
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// LinkAdrReq has 4 bytes length + 1 byte CMD
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retIndex = 5;
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}
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return retIndex;
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}
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uint8_t RegionCommonLinkAdrReqVerifyParams( RegionCommonLinkAdrReqVerifyParams_t* verifyParams, int8_t* dr, int8_t* txPow, uint8_t* nbRep )
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{
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uint8_t status = verifyParams->Status;
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int8_t datarate = verifyParams->Datarate;
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int8_t txPower = verifyParams->TxPower;
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int8_t nbRepetitions = verifyParams->NbRep;
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// Handle the case when ADR is off.
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if( verifyParams->AdrEnabled == false )
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{
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// When ADR is off, we are allowed to change the channels mask and the NbRep,
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// if the datarate and the TX power of the LinkAdrReq are set to 0x0F.
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if( ( verifyParams->Datarate != 0x0F ) || ( verifyParams->TxPower != 0x0F ) )
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{
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status = 0;
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nbRepetitions = verifyParams->CurrentNbRep;
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}
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// Get the current datarate and tx power
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datarate = verifyParams->CurrentDatarate;
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txPower = verifyParams->CurrentTxPower;
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}
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if( status != 0 )
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{
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// Verify datarate. The variable phyParam. Value contains the minimum allowed datarate.
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if( RegionCommonChanVerifyDr( verifyParams->NbChannels, verifyParams->ChannelsMask, datarate,
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verifyParams->MinDatarate, verifyParams->MaxDatarate, verifyParams->Channels ) == false )
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{
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status &= 0xFD; // Datarate KO
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}
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// Verify tx power
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if( RegionCommonValueInRange( txPower, verifyParams->MaxTxPower, verifyParams->MinTxPower ) == 0 )
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{
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// Verify if the maximum TX power is exceeded
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if( verifyParams->MaxTxPower > txPower )
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{ // Apply maximum TX power. Accept TX power.
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txPower = verifyParams->MaxTxPower;
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}
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else
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{
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status &= 0xFB; // TxPower KO
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}
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}
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}
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// If the status is ok, verify the NbRep
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if( status == 0x07 )
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{
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if( nbRepetitions == 0 )
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{ // Keep the current one
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nbRepetitions = verifyParams->CurrentNbRep;
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}
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}
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// Apply changes
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*dr = datarate;
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*txPow = txPower;
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*nbRep = nbRepetitions;
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return status;
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}
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double RegionCommonComputeSymbolTimeLoRa( uint8_t phyDr, uint32_t bandwidth )
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{
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return ( ( double )( 1 << phyDr ) / ( double )bandwidth ) * 1000;
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}
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double RegionCommonComputeSymbolTimeFsk( uint8_t phyDr )
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{
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return ( 8.0 / ( double )phyDr ); // 1 symbol equals 1 byte
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}
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void RegionCommonComputeRxWindowParameters( double tSymbol, uint8_t minRxSymbols, uint32_t rxError, uint32_t wakeUpTime, uint32_t* windowTimeout, int32_t* windowOffset )
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{
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*windowTimeout = MAX( ( uint32_t )ceil( ( ( 2 * minRxSymbols - 8 ) * tSymbol + 2 * rxError ) / tSymbol ), minRxSymbols ); // Computed number of symbols
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*windowOffset = ( int32_t )ceil( ( 4.0 * tSymbol ) - ( ( *windowTimeout * tSymbol ) / 2.0 ) - wakeUpTime );
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}
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int8_t RegionCommonComputeTxPower( int8_t txPowerIndex, float maxEirp, float antennaGain )
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{
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int8_t phyTxPower = 0;
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phyTxPower = ( int8_t )floor( ( maxEirp - ( txPowerIndex * 2U ) ) - antennaGain );
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return phyTxPower;
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}
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void RegionCommonCalcBackOff( RegionCommonCalcBackOffParams_t* calcBackOffParams )
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{
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uint8_t bandIdx = calcBackOffParams->Channels[calcBackOffParams->Channel].Band;
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uint16_t dutyCycle = calcBackOffParams->Bands[bandIdx].DCycle;
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uint16_t joinDutyCycle = 0;
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// Reset time-off to initial value.
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calcBackOffParams->Bands[bandIdx].TimeOff = 0;
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if( calcBackOffParams->Joined == false )
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{
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// Get the join duty cycle
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joinDutyCycle = RegionCommonGetJoinDc( calcBackOffParams->ElapsedTime );
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// Apply the most restricting duty cycle
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dutyCycle = MAX( dutyCycle, joinDutyCycle );
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// Reset the timeoff if the last frame was not a join request and when the duty cycle is not enabled
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if( ( calcBackOffParams->DutyCycleEnabled == false ) && ( calcBackOffParams->LastTxIsJoinRequest == false ) )
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{
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// This is the case when the duty cycle is off and the last uplink frame was not a join.
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// This could happen in case of a rejoin, e.g. in compliance test mode.
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// In this special case we have to set the time off to 0, since the join duty cycle shall only
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// be applied after the first join request.
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calcBackOffParams->Bands[bandIdx].TimeOff = 0;
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}
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else
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{
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// Apply band time-off.
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calcBackOffParams->Bands[bandIdx].TimeOff = calcBackOffParams->TxTimeOnAir * dutyCycle - calcBackOffParams->TxTimeOnAir;
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}
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}
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else
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{
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if( calcBackOffParams->DutyCycleEnabled == true )
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{
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calcBackOffParams->Bands[bandIdx].TimeOff = calcBackOffParams->TxTimeOnAir * dutyCycle - calcBackOffParams->TxTimeOnAir;
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}
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else
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{
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calcBackOffParams->Bands[bandIdx].TimeOff = 0;
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}
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}
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}
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