Something spooky about #BL602 GPIO Interrupts 🤔 ... Let's disconnect #LoRa SX1276 pins DIO1 to DIO3 ... And connect DIO0 to my fav Blue LED (GPIO 11)

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

#PineCone #BL602 Blue LED switches off ... When #WisBlock transmits a #LoRa Packet ... So DIO0 Packet Received works! Why does the GPIO Interrupt hang? 🤔

https://github.com/lupyuen/bl_iot_sdk/tree/lorarecv/customer_app/sdk_app_lora

#BL602 GPIO Interrupt triggered OK when #LoRa Packet received yay! ... But why does it work now? 🤔

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

#BL602 GPIO Interrupts hanging could be due to the way we handle multiple GPIO Interrupts ... Let's revisit this when we can trigger multiple GPIO Interrupts from #LoRa SX1276

https://github.com/lupyuen/bl_iot_sdk/blob/lorarecv/customer_app/sdk_app_lora/sdk_app_lora/sx1276-board.c#L145-L196

Now that #BL602 can handle #LoRa Packet Received Interrupt ... Let's defer the LoRa Packet Processing from the Interrupt Handler to the Application Task ... How shall we do this in FreeRTOS? 🤔

https://github.com/lupyuen/bl_iot_sdk/blob/lorarecv/customer_app/sdk_app_lora/sdk_app_lora/sx1276-board.c#L404-L438

Maybe #PineTime can help #BL602! ... The NimBLE Porting Layer defines Multitasking Functions for #FreeRTOS ... Let's call them to handle #LoRa Interrupts

https://lupyuen.github.io/pinetime-rust-mynewt/articles/dfu#nimble-stack-for-bluetooth-le-on-pinetime

NimBLE Porting Layer hasn't been ported ... To #RISCV ? 🤔 ... Let's fix this for #BL602 #LoRa

https://github.com/apache/mynewt-nimble/blob/master/porting/npl/freertos/src/npl_os_freertos.c#L25-L30

Fortunately #FreeRTOS has a function to check whether we're in a #RISCV Interrupt Handler ... "xPortIsInsideInterrupt"

https://github.com/lupyuen/bl_iot_sdk/blob/lorarecv/customer_app/sdk_app_lora/sdk_app_lora/npl_os_freertos.c#L26-L34

NimBLE Porting Layer builds OK on #RISCV #BL602 #FreeRTOS yay! ... Let's call these Event Queue functions to process our received #LoRa Packets

https://lupyuen.github.io/pinetime-rust-mynewt/articles/dfu#nimble-event-queue-functions

#BL602 #FreeRTOS Multitasking made easier with NimBLE Porting Library ... Here's how we create an Event Queue ... And add an Event to the queue

https://github.com/lupyuen/bl_iot_sdk/blob/lorarecv/customer_app/sdk_app_lora/sdk_app_lora/demo.c#L238-L296

Now we handle Events from the Event Queue ... #BL602 #FreeRTOS Multitasking made easier with NimBLE Porting Library

https://github.com/lupyuen/bl_iot_sdk/blob/lorarecv/customer_app/sdk_app_lora/sdk_app_lora/demo.c#L238-L296

NimBLE Porting Library works great on #BL602 #FreeRTOS ... Multitasking made easier!

https://github.com/lupyuen/bl_iot_sdk/blob/lorarecv/customer_app/sdk_app_lora/sdk_app_lora/demo.c#L238-L296

Shall we teach #BL602 Multitasking with NimBLE Porting Layer? 1️⃣ Looks easier than FreeRTOS 2️⃣ It's portable to FreeRTOS, Mynewt, NuttX and RIOT OS 🤔

https://lupyuen.github.io/pinetime-rust-mynewt/articles/dfu#nimble-stack-for-bluetooth-le-on-pinetime

Let's use the Event Queue to forward the #LoRa Packet Received Interrupt ... From #BL602 Interrupt Handler ... To the #FreeRTOS Application Task

https://github.com/lupyuen/bl_iot_sdk/blob/lorarecv/customer_app/sdk_app_lora/sdk_app_lora/sx1276-board.c#L408-L441

#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

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

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

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

@lupyuen
Cc @mkljczk kopnal bys to do opensourceowych geekowych linkow etc?

@lupyuen
Interested in riscv. Please tell me more. Are You Chinese? Based in cm or us?

I need nickname for ya. Im bad bad with little worms for characters. No offence meant. Honestly.

Ill try to promote you around polish opensource geeky part of fedi if you want.

@lupyuen
Cc @syuilo keep link to this guy. It will matter later. Embeds will with emphasis on arm and later riscv.