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Lup Yuen Lee 李立源 Profile picture
Lup Yuen Lee 李立源
@MisterTechBlog
IoT Techie and Educator / Apache NuttX PMC @lupyuen@qoto.org
Jun 24 • 6 tweets • 3 min read
Our #RustLang App compiles for Software Floating-Point, but Apache #NuttX RTOS expects Hardware Floating-Point ... Let's fix this with a Rust Custom Target for QEMU #RISCV

Source: lupyuen.codeberg.page/articles/rust4…
Image GCC Linker won’t link the binaries: Hard-Float vs Soft-Float ... Here's how we fix the #RustLang binaries in Apache #NuttX RTOS

Article: lupyuen.codeberg.page/articles/rust4…
Image
Dec 18, 2023 • 10 tweets • 5 min read
Let's look inside the #RISCV Sv39 Memory Management Unit ... With Apache #NuttX RTOS on @ThePine64 #Ox64 64-bit SBC

Article: lupyuen.codeberg.page/articles/mmu
Image Protecting the RAM and I/O Memory inside our #Ox64 BL808 SBC

Article: lupyuen.codeberg.page/articles/mmu.h…
Image
Sep 10, 2023 • 14 tweets • 7 min read
Let's power up the Display Controller inside #RISCV Star64 #JH7110 SBC @ThePine64 ... By running simple commands in the #UBoot Bootloader

Article: lupyuen.codeberg.page/articles/displ…
Image #UBoot Commands "md" and "mw" for Dumping and Writing Memory

Article: lupyuen.codeberg.page/articles/displ…
Image
Aug 22, 2023 • 14 tweets • 7 min read
#RISCV Star64 #JH7110 SBC is now supported by Apache #NuttX RTOS! Let's review how we created the first release of NuttX for Star64 @ThePine64

Article: lupyuen.codeberg.page/articles/relea…
Image Here's how we build Apache #NuttX RTOS for #RISCV Star64 #JH7110 SBC

Article: lupyuen.codeberg.page/articles/relea…
Image
Aug 9, 2023 • 6 tweets • 3 min read
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)

Article: https://t.co/nhtphJNCvVlupyuen.codeberg.page/articles/semih…
Image Apache #NuttX RTOS crashes on Star64 #JH7110 with #RISCV MCAUSE 3 ... Let's find out why

Article: https://t.co/YWcdZqVdcelupyuen.codeberg.page/articles/semih…
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May 30, 2023 • 15 tweets • 16 min read
Will #LVGL Graphical Apps run in the Web Browser ... With #WebAssembly and #ZigLang Compiler? Let's find out!

Article: lupyuen.codeberg.page/articles/lvgl3… Image Simple #WebAssembly app in #ZigLang

Article: lupyuen.codeberg.page/articles/lvgl3… Image
Mar 22, 2023 • 15 tweets • 12 min read
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
Jun 24, 2021 • 34 tweets • 28 min read
Come join me (the "monster" 😂) as we dive deep into the #WiFi Code inside #RISCV #BL602 (the "wifi chip" 😂)

lupyuen.github.io/articles/pinec… Image Many thanks to this hilarious (but truthful) comment on #BL602 😂

Apr 7, 2021 • 21 tweets • 20 min read
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