Lup Yuen Lee 李立源 @lupyuen@qoto.org

Semtech's Reference Implementation of #LoRa SX1262 Driver is a little odd ... It doesn't process interrupts automatically! Fortunately on #BL602 FreeRTOS we can easily forward the interrupt to the Application Task for processing

https://github.com/lupyuen/bl_iot_sdk/blob/sx1262/components/3rdparty/lora-sx1262/src/radio.c#L1249-L1267

Seeking #LoRa names @PINE64

https://www.pine64.org/2021/04/15/april-update-new-developments/

RAKwireless #WisBlock receives #LoRa Packets ... From #PineCone #BL602 connected to #Pine64 LoRa Module! 🎉 Now we do the other way ... WisBlock sending LoRa Packets to BL602

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

Awesome #LoRa Goodies @PINE64 ... Many thanks to RAKwireless 👍

https://www.pine64.org/2021/04/15/april-update-new-developments/

Huge relief because HopeRF RFM90 Datasheet doesn't say that #LoRa 923 MHz is supported for Asia Region ... But we proved that the #Pine64 LoRa Module works at 923 MHz!

👍

#LoRa Chirp transmitted by #BL602 LoRa SX1262 Driver ... Captured by Airspy SDR ... In super slo mo

Sorry I goofed ... Mixed up microseconds and milliseconds in #BL602 #LoRa SX1262 Driver ... Now AirSpy SDR shows the complete LoRa Chirp! 🎉

https://github.com/lupyuen/bl_iot_sdk/commit/bbd5395e04160d97f7d56193ad7f0a2022bcb45d

We have configured the #BL602 #LoRa Transmit Timeout as 3 seconds ... But it's timing out way too quickly ... Possibly quitting the packet too soon ... Lemme check the Timer Code 🤔

https://github.com/lupyuen/bl_iot_sdk/blob/sx1262/customer_app/sdk_app_lorawan/sdk_app_lorawan/demo.c

Here's our Super Tiny #BL602 #LoRa SX1262 Blip ... In super slow mo

🤔

AirSpy SDR shows a Tiny Blip transmitted by our #BL602 #LoRa SX1262 Driver ... Looks unusually small compared with SX1276 🤔

https://github.com/lupyuen/bl_iot_sdk/blob/sx1262/customer_app/sdk_app_lorawan/sdk_app_lorawan/demo.c

#BL602 #LoRa SX1262 Driver now transmits LoRa Packets without errors ... Let's sniff the airwaves with AirSpy SDR and verify 👃

https://github.com/lupyuen/bl_iot_sdk/blob/sx1262/customer_app/sdk_app_lorawan/sdk_app_lorawan/demo.c

Yep printf() is horrible for Embedded Programming ... But it was really helpful for verifying the init flow of our #BL602 #LoRa SX1262 Driver

https://github.com/lupyuen/bl_iot_sdk/blob/sx1262/components/3rdparty/lora-sx1262/src/sx126x-board.c#L168-L232

Why did #BL602 #LoRa SX1262 Driver fail? Because BL602 SPI Port has not been initialised! 🙄 Let's fix this 👍

https://github.com/lupyuen/bl_iot_sdk/blob/sx1262/components/3rdparty/lora-sx1262/src/sx126x-board.c#L152-L158

Starting the #BL602 #LoRa SX1262 Driver ... Fails with an SPI Assertion Failure 😭 ... Let's find out what's wrong 🤔

(Yep Assertions are very helpful! 👍)

https://github.com/lupyuen/bl_iot_sdk/blob/sx1262/components/3rdparty/lora-sx1262/src/sx126x-board.c#L152-L158

What's inside the @PINE64 #LoRa Gateway

https://twitter.com/TvPrivacy/status/1382551710032347139?s=19

Let's test the SPI Connection between #BL602 and #LoRa SX1262 by reading some registers ... Yep the values are consistent ... Looks promising 🙏

https://github.com/lupyuen/bl_iot_sdk/blob/sx1262/customer_app/sdk_app_lorawan/sdk_app_lorawan/demo.c#L112-L128

PineCone #BL602 with #Pine64 #LoRa Module all boxed up ... Let's test this! 🙏

https://github.com/lupyuen/bl_iot_sdk/blob/sx1262/components/3rdparty/lora-sx1262/include/sx126x-board.h#L36-L63

Pine64 #LoRa SX1262 / RFM90 Module ... Connected to #PineCone #BL602 @ThePine64 ... Have some Wonderful Copenhagen Butter Cookies!

https://github.com/lupyuen/bl_iot_sdk/blob/sx1262/components/3rdparty/lora-sx1262/include/sx126x-board.h#L36-L63

#LoRa SX1262 (top) vs SX1276 (bottom) ... Pinouts are similar

👍

#LoRa SX1262 Power Amplifier baffles me ... Wish I was an Engineer 🤔

https://semtech.my.salesforce.com/sfc/p/#E0000000JelG/a/2R000000HT76/7Nka9W5WgugoZe.xwIHJy6ebj1hW8UJ.USO_Pt2CLLo