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Lup Yuen Lee 李立源 Profile picture
@MisterTechBlog
Apr 7, 2021 • 21 tweets • 20 min read • Read on X
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Now we port the #LoRaWAN Driver ... From Apache #Mynewt OS to #RISCV #BL602

github.com/lupyuen/bl_iot… Image
Our #BL602 #LoRaWAN Driver has many Layers (like Shrek) ... Let's peel the Shrek ... (erm) Layers 🧅

github.com/lupyuen/bl_iot… Image
The Application Layer (left) of our #BL602 #LoRaWAN Driver exposes LoRaWAN Functions to Application Firmware ... Join Network, Open/Close Port, Transmit/Receive Packets

github.com/lupyuen/bl_iot… BL602 LoRaWAN Driver: Appli...
#Mynewt OS has a #LoRaWAN Command-Line App that calls the Application Layer of the LoRaWAN Driver ... We shall port this app to #BL602 too

mynewt.apache.org/latest/tutoria… Image
For #Arduino Fans: @RAKwireless has a #WisBlock #LoRaWAN Tutorial ... We shall try this later

github.com/RAKWireless/Wi… Image
The Node Layer (centre) in our #BL602 #LoRaWAN Driver handles the networking operations for our BL602 LoRaWAN Node ... It's called by the Application Layer (left)

github.com/lupyuen/bl_iot… Image
What's MCPS in the #BL602 #LoRaWAN Driver? ... That's the "MAC Common Part Sublayer", which is defined in the Semtech LoRaWAN Stack

stackforce.github.io/LoRaMac-doc/Lo… Image
Semtech #LoRaWAN Stack is structured according to IEEE 802.15.4 ... Yep LoRaWAN shares the same legacy as Thread, Zigbee and 6LoWPAN! We shall port this #IoT Legacy to #BL602

en.wikipedia.org/wiki/IEEE_802.… Image
The Medium Access Control Layer (right) of our #BL602 #LoRaWAN Driver implements the LoRaWAN Protocol: Encryption, Receive Window, Duty Cycle, ... It exposes the MCPS Messaging Interface (IEEE 802.15.4) to the Node Layer (centre) via an Event Queue

github.com/lupyuen/bl_iot… Image
The #LoRaWAN Protocol is explained in this thread: Encryption, Receive Window, Duty Cycle, ...

How shall we implement the #BL602 #LoRaWAN Event Queue for the Medium Access Control Layer? With the NimBLE Porting Layer of course!

lupyuen.github.io/articles/lora2… Image
Curiously, our #BL602 #LoRaWAN Driver includes a Command-Line Interface (bottom) that Transmits and Receives LoRa Packets ... Directly calling the SX1276 Driver 🤔

github.com/lupyuen/bl_iot… Image
Uh-oh our #BL602 #LoRaWAN Driver (from Mynewt) passes LoRaWAN Packets in Mbuf Format ... Let's find something equivalent on BL602 🤔

github.com/lupyuen/bl_iot… Image
What's an Mbuf? Why is it used by our #BL602 #LoRaWAN Driver? Mbufs are Chains of Fixed-Size Blocks ... Works great with little RAM (no fragmentation) ... Created for BSD Unix in 1983!

mynewt.apache.org/latest/os/core… Image
#BL602 IoT SDK has a "pbuf" in the lwIP Lightweight TCP/IP Stack ... Maybe our BL602 #LoRaWAN Driver can use this instead of Mbuf? 🤔

github.com/lupyuen/bl_iot… Image
Here's a friendly doc by STMicro that explains MCPS Messaging in our #BL602 #LoRaWAN Driver

st.com/content/ccc/re… Image
...Which explains why so many folks at STMicro are now reading this #BL602 #LoRaWAN Thread

😉 Image
Yep "pbuf" from the #BL602 Lightweight IP Stack can be used instead of Mbuf ... We just need to shift the Header / Payload Pointer to work on #LoRaWAN Packets

github.com/lupyuen/bl_iot… Image
We verify that #BL602 "pbuf" Packet Buffers can handle a full #LoRaWAN Packet ... Header: 20 bytes, Max Payload: 255 bytes

github.com/lupyuen/bl_iot… Image
Why #BL602 "pbuf" is OK for handling #LoRaWAN Packets

github.com/lupyuen/bl_iot… Image
Our #LoRaWAN Driver uses Mbuf Queues (from Mynewt OS) ... We shall convert them to #BL602 pbuf Event Queues ... From the NimBLE Porting Library

github.com/lupyuen/bl_iot… Image

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Lup Yuen Lee 李立源 Profile picture
Aug 9, 2023
Apache #NuttX RTOS crashes on @ThePine64 Star64 #JH7110 #RISCV SBC because there's no Semihosting ... Let's modify NuttX to boot with an Initial RAM Disk instead (initrd)

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Lup Yuen Lee 李立源 Profile picture
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Will #LVGL Graphical Apps run in the Web Browser ... With #WebAssembly and #ZigLang Compiler? Let's find out!

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Simple #WebAssembly app in #ZigLang

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Lup Yuen Lee 李立源 Profile picture
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Building the #PinePhone USB Driver for Apache #NuttX Real-Time Operating System ... All shall be explained in this article

Article: lupyuen.github.io/articles/usb3?1 Image
#PinePhone USB Programming is so much easier with USB EHCI ... Here's why

Article: lupyuen.github.io/articles/usb3?… Image
#PinePhone USB EHCI Registers are (thankfully) documented in the Allwinner A64 manual

Article: lupyuen.github.io/articles/usb3?… Image
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