Lup Yuen Lee 李立源

Now we Transmit Packets ... From RAKwireless ... To @PINE64

lupyuen.github.io/articles/wis

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Lup Yuen Lee 李立源

Let's use this sample app to transmit Packets

github.com/RAKWireless/WisBloc

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Lup Yuen Lee 李立源

Receiving Packets on gets tricky ... Because SX1276 triggers a GPIO Interrupt when a packet is received ... And the Interrupt Handler needs to forward the packet to the Application Task 🤔

github.com/lupyuen/bl_iot_sdk/

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Lup Yuen Lee 李立源

To receive Packets on : We listen for GPIO Interrupts on SX1276 Pins DIO0 to DIO3 (4 pins) ... Yep we're nearly out of GPIO Pins 🤔

github.com/lupyuen/bl_iot_sdk/

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Lup Yuen Lee 李立源

Wiring looks too sus among us 🤔 ... @PINE64 connected to Hope RF96 ... Including DIO0 to DIO3

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源

Simple fix for a PlatformIO build error in 's LoRaP2P_TX sample ... My first Pull Request for WisBlock!

github.com/RAKWireless/WisBloc

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Lup Yuen Lee 李立源

How we configure a GPIO Interrupt on ... For receiving Packets

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源

GPIO Interrupt ... According to the BL602 Reference Manual 🤔

github.com/bouffalolab/bl_docs

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Lup Yuen Lee 李立源

GPIO Interrupts: Should we use Sync or Async Interrupts for ? 🤔 ... BL602 IoT SDK uses Async Interrupts to handle GPIO Buttons ... Let's do the same for LoRa

github.com/bouffalolab/bl_iot_

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Lup Yuen Lee 李立源

Maybe High Level Trigger Interrupt = High Priority Interrupt = Sync Interrupt? 🤔 ... Lemme check the original Chinese Reference Manual

github.com/bouffalolab/bl_docs

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Lup Yuen Lee 李立源

My bad ... High Level Trigger Interrupt = 高电平触发中断 = Trigger Interrupt on Logic High ... Nothing to do with priority 🤔

github.com/bouffalolab/bl_docs

1
Lup Yuen Lee 李立源

Let's test whether SX1276 triggers GPIO Interrupts correctly on ... When it receives a LoRa Packet ... The Interrupt Counters shall tell us

github.com/lupyuen/bl_iot_sdk/

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Lup Yuen Lee 李立源

Flashed the Transmitter to @RAKwireless ... This Arduino program transmits "Hello" in a LoRa Packet every 5 seconds

github.com/lupyuen/wisblock-lo

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Lup Yuen Lee 李立源

Transmitter ... Sniffed by Airspy R2 SDR ... Watch the distinctive LoRa Chirp (red spike)

youtu.be/USqStub3KC0

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Lup Yuen Lee 李立源

When transmits Packets ... Our LoRa Receiver hangs! ... Let's find out why 🤔

github.com/lupyuen/bl_iot_sdk/

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Lup Yuen Lee 李立源

Maybe is stuck forever handling Packet Received Interrupts? 🤔 ... Let's suppress GPIO Interrupts after handling the first 5 interrupts

github.com/lupyuen/bl_iot_sdk/

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Lup Yuen Lee 李立源

And still hangs when transmits Packets ... Chaos Magic 🤔

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Lup Yuen Lee 李立源
Follow

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

github.com/lupyuen/bl_iot_sdk/

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

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

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源

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

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源

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 SX1276

github.com/lupyuen/bl_iot_sdk/

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Lup Yuen Lee 李立源

Now that can handle 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? 🤔

github.com/lupyuen/bl_iot_sdk/

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Lup Yuen Lee 李立源

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

lupyuen.github.io/pinetime-rus

1
Lup Yuen Lee 李立源

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

github.com/apache/mynewt-nimbl

1
Lup Yuen Lee 李立源

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

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源

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

lupyuen.github.io/pinetime-rus

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Lup Yuen Lee 李立源

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

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源

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

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源

NimBLE Porting Library works great on ... Multitasking made easier!

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源

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

lupyuen.github.io/pinetime-rus

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Lup Yuen Lee 李立源

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

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源

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

github.com/lupyuen/bl_iot_sdk/

1
Lup Yuen Lee 李立源

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

lupyuen.github.io/articles/i2c

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Lup Yuen Lee 李立源

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

github.com/lupyuen/bl_iot_sdk/

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Lup Yuen Lee 李立源

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

github.com/lupyuen/bl_iot_sdk/

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Lup Yuen Lee 李立源

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

gist.github.com/lupyuen/1539f9

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Lup Yuen Lee 李立源

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

github.com/lupyuen/bl_iot_sdk/

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

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@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.

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Lup Yuen Lee 李立源

@PawelK Hi call me Lup (rhymes with "Up"), I'm just a geek in Singapore. Here's the story of my life 😉 ...

lupyuen.github.io/

I'm tied up with projects right now ... Sorry I won't be able to help you much

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@lupyuen
No worries. Thanks for intro im polish retired young. Based c/cpp. 15 years of exp. Mostly embeds. Some 4g and 5g infrastructure devel experience. Selftaught. IT is my life. Nerd. Pro opensource.

Riscv is the postarm. We need it badly.

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@lupyuen
Hmm lora nice nice.

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@lupyuen
Are those two platforms using two different operating systems? Generally depends whether irq handler lives in same adress space as setup code. General guideline for portable code should be using either static data accessible from irq code or dynamically allocated data passable between two adress spaces.

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

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