Lup Yuen Lee 李立源 @lupyuen@qoto.org

#PinePhone talks to Quectel EG25-G 4G LTE Modem on these pins

Source: https://github.com/lupyuen/pinephone-nuttx-usb#lte-modem-pins

Power up #PinePhone LTE Modem ... Here's how we do it with Apache #NuttX RTOS

Source: https://github.com/lupyuen/pinephone-nuttx-usb#power-on-lte-modem

How we handle USB Interrupts on #PinePhone with Apache #NuttX RTOS

Source: https://github.com/lupyuen/pinephone-nuttx-usb#handle-usb-interrupt

Here's how Apache #NuttX RTOS enumerates USB Devices on #PinePhone

Source: https://github.com/lupyuen/pinephone-nuttx-usb#enumerate-usb-devices-on-pinephone

#NuttX on #PinePhone fails when we enable USB Host ... Wonder why 🤔

Source: https://github.com/lupyuen/pinephone-nuttx-usb#ls-crashes-when-usb-hub-support-is-enabled

Experimenting with Vital Wheat Gluten ... Because Wholemeal Bread feels too crumbly 🤔

Deciphering the USB EHCI Registers on #PinePhone ... That were logged by Apache #NuttX RTOS

Source: https://github.com/lupyuen/pinephone-nuttx-usb#decode-ehci-register-values

My very first loaf of bread 👍

We’re one step closer to our dream of a Feature Phone running Apache #NuttX RTOS!

Article: https://lupyuen.github.io/articles/usb3?15#whats-next

"curl_easy_init" 🤔

Up Next: Enumerating the USB Devices on #PinePhone ... With Apache #NuttX RTOS

Article: https://lupyuen.github.io/articles/usb3?12#nuttx-ehci-driver-starts-ok-on-pinephone

USB Driver from Apache #NuttX RTOS ... Starts OK on #PinePhone yay! 🎉

Article: https://lupyuen.github.io/articles/usb3?12#nuttx-ehci-driver-starts-ok-on-pinephone

Resetting the USB Controller on #PinePhone ... Inside the USB Driver for Apache #NuttX RTOS

Article: https://lupyuen.github.io/articles/usb3?11#reset-usb-controller

Enabling #PinePhone USB Clocks ... How we do it for Apache #NuttX RTOS

Article: https://lupyuen.github.io/articles/usb3?10#enable-usb-controller-clocks

Here's how we enable the USB Clocks for #PinePhone

Article: https://lupyuen.github.io/articles/usb3?10#enable-usb-controller-clocks

"Write an article about NuttX, PinePhone and USB in my style" 🤔

U-Boot Bootloader's mystery code for #PinePhone USB ... We'll decipher this someday

Article: https://lupyuen.github.io/articles/usb3?9#power-on-the-usb-controller

To power up #PinePhone USB Controller: 1️⃣ Enable the USB Clocks 2️⃣ Deassert the USB Resets

Article: https://lupyuen.github.io/articles/usb3?9#power-on-the-usb-controller

U-Boot Device Tree reveals the USB Drivers for #PinePhone

Article: https://lupyuen.github.io/articles/usb3?8#pinephone-usb-drivers-in-u-boot-bootloader

Here's how we find the #PinePhone USB Driver in U-Boot Bootloader

Article: https://lupyuen.github.io/articles/usb3?8#pinephone-usb-drivers-in-u-boot-bootloader