SX1272 reset pin inverted

[sjd227]

Looking at the sx1272 datasheet, it looks like reset is done by pulling the reset pin HIGH for 100 microseconds, then releasing it LOW:

But in sx127x.cpp it seems reversed:

void SX127x::reset() {
     Module::pinMode(_mod->getRst(), OUTPUT);
     Module::digitalWrite(_mod->getRst(), LOW);
     delayMicroseconds(100);
     Module::digitalWrite(_mod->getRst(), HIGH);
     delay(5);
}

Thoughts?

• Steven

[jgromes]

It looks like SX1272 has a positive-logic reset (RST=1 to reset), while SX1278 has negative logic (NRST=0 to reset). The current implementation will work for for SX1276/77/78/79, though not for SX1272/73. Will fix asap.

[jgromes]

Fixed in c1c991acc831cbb457cf96037eb9cf4ced261a6f, will release the fix as 3.4.0. Thanks for reporting!

[sjd227]

Sounds good, thanks!

[naggie]

This explains a lot. Thanks @sjd227 and @jgromes . Definitely encountered this