Lup Yuen Lee 李立源 @lupyuen@social.cleverlibre.org

Anything we type into #PinePhone’s Serial Console will become UART Input ... Here's how we read it

https://lupyuen.github.io/articles/serial?5#receive-uart

Sorry I had to rename "NuttX RTOS On PinePhone" because backwards it spells... 🙄

How we wait for #PinePhone's UART Port before we transmit

https://lupyuen.github.io/articles/serial?4#wait-to-transmit

Sending data to #PinePhone's UART Port is easy ... But we need to check the Transmit Buffer

https://lupyuen.github.io/articles/serial?3#transmit-uart

Here's how we send data to #PinePhone's UART Port

https://lupyuen.github.io/articles/serial?3#uart-with-polling

BASIC blinks the #PinePhone LEDs ... On Apache #NuttX RTOS 🤩

https://github.com/lupyuen/pinephone-nuttx#basic-blinks-the-leds

Here are the UART Registers for #PinePhone's Allwinner A64 SoC

https://lupyuen.github.io/articles/serial?2#uart-output

How #PinePhone talks UART with Interrupts ... And how it's implemented in #NuttX RTOS ... All shall be explained in this article

https://lupyuen.github.io/articles/serial?1

Each Arm64 Exception Level has its own Vector Table ... Here's how #NuttX RTOS loads the Arm64 Vector Table on #PinePhone

https://lupyuen.github.io/articles/interrupt?9#exception-levels

#NuttX RTOS lights up the #PinePhone LEDs ... And the Backlight too! 🎉

https://github.com/lupyuen/pinephone-nuttx#backlight-and-leds

What's an Arm64 Exception Level ... And why it matters for #PinePhone Interrupts

https://lupyuen.github.io/articles/interrupt?9#exception-levels

Checking our Arm64 Vector Table on #PinePhone ... Yep it's wrong! 🙄

https://lupyuen.github.io/articles/interrupt?8#arm64-vector-table-is-wrong

Inside the Arm64 Vector Table on #PinePhone

https://lupyuen.github.io/articles/interrupt?8#arm64-vector-table-is-wrong

Troubleshooting the Timer Interrupt on #PinePhone

https://lupyuen.github.io/articles/interrupt?7#timer-interrupt-isnt-handled

Why did the System Timer freeze #PinePhone? Let's find out!

https://lupyuen.github.io/articles/interrupt?6#pinephone-hangs-at-startup

Dumping the #QEMU Device Tree ... Reveals the address of Generic Interrupt Controller

https://lupyuen.github.io/articles/interrupt?5#test-pinephone-gic-with-qemu

Let's test our Generic Interrupt Controller on #QEMU ... Before running on #PinePhone

https://lupyuen.github.io/articles/interrupt?5#test-pinephone-gic-with-qemu

#NuttX's Generic Interrupt Controller for Arm32 ... Seems to run on #PinePhone with a few tweaks

https://lupyuen.github.io/articles/interrupt?4#gic-version-2

#NuttX RTOS supports Generic Interrupt Controller version 2 ... We hacked it to run on #PinePhone

https://lupyuen.github.io/articles/interrupt?4#gic-version-2

#PinePhone Hacking with Pinebook Pro @PINE64 and BLÅHAJ

https://lupyuen.github.io/articles/uboot