And #BL602 still hangs when #WisBlock transmits #LoRa Packets ... Chaos Magic 🤔

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

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