Here's how we init the SPI Bus and SPI Chip Select (GPIO Output) ... In our #NuttX SX1262 Library

https://github.com/lupyuen/lora-sx1262/blob/nuttx/src/sx126x-nuttx.c#L663-L675

Our #NuttX SX1262 Library calls the SPI Test Driver to transfer data over SPI

https://github.com/lupyuen/lora-sx1262/blob/nuttx/src/sx126x-nuttx.c#L677-L703

Let's read some SX1262 Registers ... With our SX1262 Library for #NuttX OS

https://github.com/lupyuen/incubator-nuttx-apps/blob/sx1262/examples/sx1262_test/sx1262_test_main.c#L155-L171

Yep our #NuttX SX1262 Library reads the SX1262 Registers correctly! 🎉

https://gist.github.com/lupyuen/1e732f5b1e0e4a80d1eb351ab3aadede

Now we transmit a #LoRa Message with our #NuttX SX1262 Library

https://github.com/lupyuen/incubator-nuttx-apps/blob/sx1262/examples/sx1262_test/sx1262_test_main.c#L237-L253

Our #NuttX SX1262 Library transmits a #LoRa Message ... We sniff the message with Airspy R2 SDR

https://github.com/lupyuen/lora-sx1262/tree/nuttx

https://airspy.com/airspy-r2/

SDR shows the #LoRa Chirp transmitted by our #NuttX SX1262 Library 🎉 ... Let's inspect the message with a LoRa Receiver

https://gist.github.com/lupyuen/5fdede131ad0e327478994872f190668

Let's use #RAKwireless WisBlock to inspect the #LoRa Message transmitted by our #NuttX SX1262 Library

https://github.com/lupyuen/wisblock-lora-receiver

#LoRa Message transmitted by our #NuttX SX1262 Library ... Received OK by RAKwireless WisBlock! 🎉

https://gist.github.com/lupyuen/5fdede131ad0e327478994872f190668

Now our #NuttX SX1262 Library shall receive a #LoRa Message ... Transmitted by #RAKwireless WisBlock

https://github.com/lupyuen/wisblock-lora-transmitter

Here's how we receive #LoRa Messages with our #NuttX SX1262 Library ... Eventually this will be triggered by GPIO Interrupt (instead of polling)

https://github.com/lupyuen/incubator-nuttx-apps/blob/sx1262/examples/sx1262_test/sx1262_test_main.c#L123-L262

Our #NuttX SX1262 Library correctly receives the #LoRa Message transmitted by #RAKwireless WisBlock! 🎉

https://gist.github.com/lupyuen/0d78b13871fca41ac6d812407890b29b

Our plain and simple #NuttX #LoRa SX1262 Library is (nearly) done! Porting the library from Linux to NuttX wasn't so hard ... Moving on to LoRaWAN real soon!

https://github.com/lupyuen/lora-sx1262/tree/nuttx

Porting the #LoRa SX1262 Driver from Linux to Apache #NuttX OS ... All shall be explained in this article

https://lupyuen.github.io/articles/sx1262?1

We port the #LoRa SX1262 Driver to #NuttX OS ... In small steps

https://lupyuen.github.io/articles/sx1262?2#small-steps

Why #LoRaWAN is so complex ... And why we should stick to the official Semtech Drivers for LoRa and LoRaWAN

https://lupyuen.github.io/articles/sx1262?3#lorawan-support

#NuttX Libraries vs Drivers ... Libraries are easier to code and troubleshoot

https://lupyuen.github.io/articles/sx1262?4#library-vs-driver

Here's how we create a Library in #NuttX OS

https://lupyuen.github.io/articles/sx1262?5#appendix-create-a-nuttx-library

Adding our Library to the #NuttX Makefiles and Kconfig

https://lupyuen.github.io/articles/sx1262?6#update-makefiles-and-kconfig

Testing our Library on Apache #NuttX OS

https://lupyuen.github.io/articles/sx1262?7#enable-library

How #LoRa SX1262 is wired up on #PineDio Stack BL604 ... And how we configure the pins on Apache #NuttX OS

https://lupyuen.github.io/articles/sx1262?8#connect-sx1262-transceiver

What are DIO1, BUSY and NRESET Pins on #LoRa SX1262 ... Nope we're not using them on #NuttX OS yet

https://lupyuen.github.io/articles/sx1262?8#connect-sx1262-transceiver

How we call our #NuttX #LoRa Library ... To read the SX1262 Registers

https://lupyuen.github.io/articles/sx1262?9#read-sx1262-registers

Building our #NuttX Firmware for #LoRa SX1262

https://lupyuen.github.io/articles/sx1262?10#build-the-firmware

Yep our #NuttX #LoRa Library reads the SX1262 Registers OK! 🎉

https://lupyuen.github.io/articles/sx1262?11#run-the-firmware

Our #NuttX #LoRa Library has layers ... Like Shrek 😂

https://lupyuen.github.io/articles/sx1262?12#source-files

Setting the #LoRa Parameters for #NuttX OS

https://lupyuen.github.io/articles/sx1262?15#lora-parameters

Here's how we send a #LoRa Message on #NuttX OS

https://lupyuen.github.io/articles/sx1262?16#transmit-lora-message

Our #NuttX SX1262 Library transmits #LoRa Messages correctly! 🎉

https://lupyuen.github.io/articles/sx1262?17#run-the-firmware-1

Troubleshooting our #NuttX #LoRa Library with a Software Defined Radio

https://lupyuen.github.io/articles/sx1262?18#spectrum-analysis-with-sdr

Calling our #NuttX SX1262 Library to receive a #LoRa Message

https://lupyuen.github.io/articles/sx1262?19#receive-lora-message

Our #NuttX SX1262 Library works OK for receiving #LoRa Messages! 🎉

https://lupyuen.github.io/articles/sx1262?20#run-the-firmware-2

How our #NuttX SX1262 Library inits the SPI Bus

https://lupyuen.github.io/articles/sx1262?22#initialise-spi

Our #NuttX SX1262 Library transfers SPI Data by calling the SPI Test Driver

https://lupyuen.github.io/articles/sx1262?23#transfer-spi

Here's the SPI Data transferred by #NuttX to #LoRa SX1262

https://lupyuen.github.io/articles/sx1262?24#spi-in-action

Our #NuttX SX1262 Library shall handle GPIO Interrupts someday

https://lupyuen.github.io/articles/sx1262?25#gpio-interface

Multithreading will be needed for our #NuttX #LoRa and LoRaWAN Drivers ... Which we'll implement with NimBLE Porting Layer

https://lupyuen.github.io/articles/sx1262?26#multithreading-with-nimble-porting-layer

Porting #LoRaWAN to Apache #NuttX OS ... Might have interesting challenges 🤔

https://lupyuen.github.io/articles/sx1262?28#notes