Lup Yuen Lee 李立源

Let's connect @PINE64 to RF96 ... Always connect Antenna before Power! ⚡... Bought from Tindie

tindie.com/products/m2m/lora-m

1
Lup Yuen Lee 李立源

We'll port the SX1276 Driver from OS to IoT SDK ... Because the GPIO and SPI Hardware Abstraction Layers are quite similar

github.com/apache/mynewt-core/

1
Lup Yuen Lee 李立源

Porting SX1276 Driver from Mynewt to IoT SDK

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源

SX1276 Driver listens for GPIO Interrupts on 6 (!) GPIO Pins ... Maybe can defer this ... If we're not receiving LoRa Packets 🤔

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源

IoT SDK builds Driver successfully yay! Now filling in the SPI Functions to talk to SX1276

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源

Transmit and Receive Data on ... Piece of kueh! 🍰

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源

Let's test the Driver ... With the "LoRa Ping" app ported from OS

github.com/apache/mynewt-core/

1
Lup Yuen Lee 李立源

nearly out of pins (and colours) for SX1276 ... Let's use these pins for now

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源

Let's test whether can talk to SX1276 over SPI ... By dumping some SX1276 registers

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源

Yep talks OK to SX1276 over SPI ... SX1276 register values look correct ... Now let's transmit a LoRa Message!

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源

Unsolved Mystery ... BL602 must be configured for SPI Phase 1 to talk to SX1276 ... But SX1276 actually uses SPI Phase 0! 🤔

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源

Our SX1276 (actually RF96) is factory configured for 434 MHz, sez the Frequency Registers ... will tune it to 923 MHz for Singapore

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源

How will we know if our + SX1276 are misbehavin’ on the airwaves? We got a spy ... An AirSpy Software Defined Radio

airspy.com/airspy-r2

1
Lup Yuen Lee 李立源

923 MHz on a quiet Singapore night ... Captured by and R2 Software Defined Radio 📻

youtu.be/RJIRTz2zUok

1+
Lup Yuen Lee 李立源

inits the SX1276 Driver ... By writing a bunch of SX1276 Registers over SPI ... So far so good!

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源

sends a message ... By copying the message to SX1276 Transmit FIFO over SPI ... Was the message actually transmitted? Airspy will tell!

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源
Follow

Someday we shall pack @ThePine64 with ... Into this cute clear Junction Box

· · Tusky · 1 · 1 · 0
Lup Yuen Lee 李立源

But today we shall spy on + ... With an R2 Software Defined Radio 📻

1
Lup Yuen Lee 李立源

+ SX1276 + Airspy SDR ... Inside an improvised Faraday Cage 🫕 ... It really works!

1+
Lup Yuen Lee 李立源

Nope Airspy SDR couldn't sniff our at 923 MHz ... Though it sniffed others thru the Faraday Cage (erm) Pot 🤔

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源

CubicSDR software works better with Airspy ... Here's the Packet (64 bytes) centered at 923 MHz with bandwidth 125 kHz

cubicsdr.com/

1
Lup Yuen Lee 李立源

Let's zoom into the Packet ... And hunt for the LoRa Chirp!

pubs.gnuradio.org/index.php/gr

1
Lup Yuen Lee 李立源

1️⃣ Enable SX1276 Power Amplifier 2️⃣ Increase Airspy sample rate to 10 MHz ... LoRa Packets never looked better!

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源

Captured the Legendary Chirp! (The helix thingy)

pubs.gnuradio.org/index.php/gr

1
Lup Yuen Lee 李立源

Someone captured this Chirp with HackRF One SDR ... Isn't this beautiful?

linkedin.com/feed/update/urn:l

1+
Lup Yuen Lee 李立源

Chirp ... One last shot

pubs.gnuradio.org/index.php/gr

1
Lup Yuen Lee 李立源

Sending Packets from @PINE64 ? Connect these 5 data pins to Semtech SX1276 or Hope RF96

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源

Connect @PINE64 to Transceiver ... All shall be explained here

lupyuen.github.io/articles/lor

0
👁 socat

@lupyuen It's a nice trick :þ

0
Kermode

@lupyuen

cubicsdr.com/?page_id=35

0
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