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Set Low data rate optimization flag #466

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Set Low data rate optimization flag #466

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19 changes: 14 additions & 5 deletions src/LoRa.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -547,11 +547,20 @@ void LoRaClass::setSignalBandwidth(long sbw)

void LoRaClass::setLdoFlag()
{
// Section 4.1.1.5
long symbolDuration = 1000 / ( getSignalBandwidth() / (1L << getSpreadingFactor()) ) ;

// Section 4.1.1.6
boolean ldoOn = symbolDuration > 16;
// Set Low data rate optimization flag when symbol longer than 16 mS
long bandwidth = getSignalBandwidth();
int datarate = getSpreadingFactor();
boolean ldoOn = false;

if( ( ( bandwidth == 125E3 ) && ( ( datarate == 11 ) || ( datarate == 12 ) ) ) ||
( ( bandwidth == 250E3 ) && ( datarate == 12 ) ) )
{
ldoOn = true;;
}
else
{
ldoOn = false;;
}

uint8_t config3 = readRegister(REG_MODEM_CONFIG_3);
bitWrite(config3, 3, ldoOn);
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