Lup Yuen Lee 李立源 @lupyuen@qoto.org

Let's handle #BL602 GPIO Interrupts the smarter way ... By iterating thru the Interrupt Events created with the NimBLE Porting Layer

https://github.com/lupyuen/bl_iot_sdk/blob/lorarecv/customer_app/sdk_app_lora/sdk_app_lora/sx1276-board.c#L369-L397

Octopus on Curry Noodles

#LoRaWAN Transmission Power vs Bandwidth vs Spreading Factor

https://www.thethingsnetwork.org/docs/lorawan/modulation-data-rate.html

#BL602 now detects Multiple GPIO Interrupts ... Triggered by #LoRa SX1276 yay!

https://github.com/lupyuen/bl_iot_sdk/blob/lorarecv/customer_app/sdk_app_lora/sdk_app_lora/sx1276-board.c#L404-L461

#BL602 supports only one Interrupt Handler for all GPIO Pins ... Let's iterate thru the #LoRa SX1276 Interrupts and handle them

https://github.com/lupyuen/bl_iot_sdk/blob/lorarecv/customer_app/sdk_app_lora/sdk_app_lora/sx1276-board.c#L404-L461

Frequency-Hopping Spread Spectrum ... Invented by Hedy Lamarr

https://en.wikipedia.org/wiki/Hedy_Lamarr

Ah my folly ways ... Multiple #BL602 GPIO Interrupts can't be registered like this ... Lemme fix this 🪠

https://github.com/lupyuen/bl_iot_sdk/blob/lorarecv/customer_app/sdk_app_lora/sdk_app_lora/sx1276-board.c#L336-L396

World Happiness Report 2021

https://worldhappiness.report/

Searching GitHub for "GPIO_INT_CLR" shows ultraembedded RISC-V SoC ... Coincidence? 🤔

https://github.com/search?l=Markdown&q=GPIO_INT_CLR&type=Code

#BL602 Reference Manual mentions "GPIO_INT_CLR" but the address is undefined in the doc ... Methinks a chunk of addresses are missing from the doc 🤔

https://github.com/bouffalolab/bl_docs/tree/main/BL602_RM/en

Mystery #BL602 GPIO Function ... What does it do? Will it fix our problem with triggering multiple GPIO Interrupts? 🤔

https://github.com/bouffalolab/bl_iot_sdk/blob/master/components/bl602/bl602_std/bl602_std/StdDriver/Src/bl602_glb.c#L2244-L2264

#BL602 now displays the #LoRa Packet received from #WisBlock yay!

https://github.com/lupyuen/bl_iot_sdk/blob/lorarecv/customer_app/sdk_app_lora/sdk_app_lora/demo.c

For #BL602 we fix this exception by copying the object ... Instead of storing a pointer to the object

https://github.com/lupyuen/bl_iot_sdk/blob/lorarecv/customer_app/sdk_app_lora/sdk_app_lora/sx1276.c#L357-L397

#BL602 #LoRa Exception happened because we passed a pointer to a stack object ... Which gets used by the Interrupt Handler 😲 ... This works OK in the original Mynewt code, but not for BL602

https://gist.github.com/lupyuen/1539f9dd52e9a83d4fbe7724481112bf

Oops the Program Counter for our #RISCV Exception is null ... So there must be a missing Callback Function somewhere in our #LoRa #BL602 Firmware 🤔

https://github.com/lupyuen/bl_iot_sdk/blob/lorarecv/customer_app/sdk_app_lora/sdk_app_lora/demo.c

#RISCV #BL602 PineCone, Pinenut and Pineseed @PINE64 are still in stock ... Phew 👍

https://pine64.com/product-category/iot/?v=0446c16e2e66

Our #BL602 Build, Flash and Run Firmware script generates the #RISCV Disassembly ... Let's track down the address of the RISC-V Exception

https://github.com/lupyuen/bl_iot_sdk/blob/lorarecv/customer_app/sdk_app_lora/run.sh

Aha! #BL602 hits a #RISCV Exception ... When processing the received #LoRa Packet! Let's follow these steps to troubleshoot...

https://lupyuen.github.io/articles/i2c#appendix-how-to-troubleshoot-risc-v-exceptions

Bill Gates: "I am innocent! The whole thing about 5G and microchips is pretty crazy. Why would I want to do that?" 😂

https://www.reddit.com/r/IAmA/comments/m8n4vt/im_bill_gates_cochair_of_the_bill_and_melinda/gri9hqj?utm_medium=android_app&utm_source=share&context=3

#LoRa Packet goes from #WisBlock Transmitter ... To #BL602 SX1276 Interrupt Handler ... To #FreeRTOS Task yay! Now we read the received LoRa Packet from SX1276 over SPI

https://github.com/lupyuen/bl_iot_sdk/blob/lorarecv/customer_app/sdk_app_lora/sdk_app_lora/demo.c