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Lup Yuen Lee 李立源 Profile picture
@MisterTechBlog
Mar 22, 2023 • 15 tweets • 12 min read • Read on X
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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
#PinePhone USB OTG is super complicated ... So we won't touch it today for Apache #NuttX RTOS

Article: lupyuen.github.io/articles/usb3?… Image
#PinePhone (Allwinner A64) has 2 USB Ports ... One goes to External USB, the other goes to LTE Modem

Article: lupyuen.github.io/articles/usb3?… Image
Here's how we configure the #NuttX USB Driver for #PinePhone

Article: lupyuen.github.io/articles/usb3?… Image
Tweaking the Apache #NuttX USB Driver for 64-bit #PinePhone

Article: lupyuen.github.io/articles/usb3?… Image
#NuttX USB Driver fails at startup ... Because we haven't powered on #PinePhone USB Controller

Article: lupyuen.github.io/articles/usb3?… Image
How to power up #PinePhone USB Controller? Let’s consult U-Boot Bootloader

Article: lupyuen.github.io/articles/usb3?… Image
Here's how we find the #PinePhone USB Driver in U-Boot Bootloader

Article: lupyuen.github.io/articles/usb3?… Image
U-Boot Device Tree reveals the USB Drivers for #PinePhone

Article: lupyuen.github.io/articles/usb3?… Image
To power up #PinePhone USB Controller: 1️⃣ Enable the USB Clocks 2️⃣ Deassert the USB Resets

Article: lupyuen.github.io/articles/usb3?… Image
U-Boot Bootloader's mystery code for #PinePhone USB ... We'll decipher this someday

Article: lupyuen.github.io/articles/usb3?… Image
Here's how we enable the USB Clocks for #PinePhone

Article: lupyuen.github.io/articles/usb3?… Image
Enabling #PinePhone USB Clocks ... How we do it for Apache #NuttX RTOS

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

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More from @MisterTechBlog

Lup Yuen Lee 李立源 Profile picture
Jun 24
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
#RustLang won’t do Double-Float for 32-bit #RISCV ... Let's create a Custom Rust Target for #NuttX on QEMU

Article: lupyuen.codeberg.page/articles/rust4…
Image
Read 6 tweets
Lup Yuen Lee 李立源 Profile picture
Dec 18, 2023
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
Here's the Level 1 Page Table for #RISCV Sv39 Memory Management Unit

Article: lupyuen.codeberg.page/articles/mmu.h…
Image
Read 10 tweets
Lup Yuen Lee 李立源 Profile picture
Sep 10, 2023
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
Writing to the Star64 #JH7110 UART Registers ... With #UBoot Bootloader

Article: lupyuen.codeberg.page/articles/displ…
Image
Read 14 tweets
Lup Yuen Lee 李立源 Profile picture
Aug 22, 2023
#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
Bootable microSD with Apache #NuttX RTOS inside ... By creating a Flat Image Tree

Article: lupyuen.codeberg.page/articles/relea…
Image
Read 14 tweets
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)

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…
Image
Apache #NuttX RTOS halts with #RISCV MCAUSE 3 because of the EBREAK Instruction for Debugging ... But we're not doing any debugging!

Article: https://t.co/BZU2aQ8tjylupyuen.codeberg.page/articles/semih…
Image
Read 6 tweets
Lup Yuen Lee 李立源 Profile picture
May 30, 2023
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
#ZigLang and JavaScript will happily interoperate in #WebAssembly ... Both ways!

Article: lupyuen.codeberg.page/articles/lvgl3… Image
Read 15 tweets

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