SF5 and SF6 configuration in Sx1262

[vikasrohal]

Hi all,
Sx1262 works on SF6 and SF5 as well, but there is no implementation of SFs in standard Firmware in any of country region.
Is there any other method to use SF5 and SF6 ?

Why SF 7 not possible on LoRa

if( dr == DR_7 )
{
modem = MODEM_FSK;
Radio.SetRxConfig( modem, 50000, phyDr * 1000, 0, 83333, 5, rxConfig->WindowTimeout, false, 0, true, 0, 0, false, rxConfig->RxContinuous );
}
else
{
modem = MODEM_LORA;
Radio.SetRxConfig( modem, rxConfig->Bandwidth, phyDr, 1, 0, 8, rxConfig->WindowTimeout, false, 0, false, 0, 0, true, rxConfig->RxContinuous );

}

[mluis1]

The SX126x radios do support LoRa spreading factors SF5 and SF6.
The radio drivers provided on this project allow the usage of SF5 and SF6.

LoRaMac-node/src/radio/sx126x/sx126x.h

Lines 347 to 360 in edff6ce

	/*!
	* \brief Represents the possible spreading factor values in LoRa packet types
	*/
	typedef enum
	{
	LORA_SF5 = 0x05,
	LORA_SF6 = 0x06,
	LORA_SF7 = 0x07,
	LORA_SF8 = 0x08,
	LORA_SF9 = 0x09,
	LORA_SF10 = 0x0A,
	LORA_SF11 = 0x0B,
	LORA_SF12 = 0x0C,
	}RadioLoRaSpreadingFactors_t;

However, LoRaWAN specifications do not use these spreading factors.

The answer to your 2nd question is yes, spreading factor SF7 is supported and used by LoRaWAN specifications.
It looks like that your are mixing different things DR_7 is not equal to SF7.
The LoRaWAN specifications defines the data rate as an index which ranges from 0 up to 15. Each index corresponds to physical radio data rate (LoRa, FSK or LR-FHSS).

Looking at LoRaWAN Regional Parameters Specification you will see for each region the mapping between the index and the real data rate.
Example for EU868 region:

As you can observe DR_7 corresponds to FSK data rate while DR_5 corresponds to SF7BW125 and DR_6 to SF7BW250