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lora/sx126x: According to datasheet, the minimum SF is 5. - #1173

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ant9000:pr/sx126x-min-sf-fix
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ant9000 wants to merge 1 commit into
micropython:masterfrom
ant9000:pr/sx126x-min-sf-fix

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@ant9000

@ant9000 ant9000 commented Nov 2, 2026

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Using LoRa modulation, lowering the spreading factor by 1 halves the time on air. The current driver sets the minimum SF at 6, but according to Semtech documentation, sx1261/sx1262 radios are able to transmit at SF5 too:

https://www.semtech.com/products/wireless-rf/lora-connect/sx1261

This proposed commit changes the driver accordingly.

Signed-off-by: Antonio Galea <antonio.galea@gmail.com>
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