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

#BL602 EVB on Apache #NuttX RTOS ... And its strange limit of 3 GPIOs 🤔

https://lupyuen.github.io/articles/expander?3#bl602-evb-limitations

TinyGo supports #RISCV 🤔

https://tinygo.org/docs/reference/microcontrollers/

Why use a GPIO Expander? Because #BL604 looks like a Big Bag of GPIOs to Apache #NuttX RTOS

https://lupyuen.github.io/articles/expander?2

Motor with Anti-Static Bag ... Might work for Auto-Testing the #PineDio Stack Touch Screen 🤔

https://lupyuen.github.io/articles/pinedio2#automated-testing

Nobody uses RTF for an Official Letter

🙄

Managing 23 GPIOs on #PineDio Stack #BL604 gets messy ... Our new GPIO Expander for Apache #NuttX RTOS can help! All shall be explained in this article

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

My First DMCA Takedown 🤔

https://github.com/lupyuen/my_logic_code

Anti-Static Bag triggers Touch Points on #PineDio Stack #BL604 ... This could be our "Robot Finger" for Auto-Testing the Touch Panel 🤔

https://lupyuen.github.io/articles/pinedio2#automated-testing

#PineDio Stack #BL604 exposes GPIO 8 (on GPIO Port) and Reset Pin (on JTAG Port) ... We could connect them to an SBC for Auto Flash & Test 🤔

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

Weird Antenna ... But works great with #LoRa on #PineDio Stack #BL604 @PINE64 ! 👍

https://lupyuen.github.io/articles/pinedio2

Our #BL604 GPIO Expander handles GPIO Interrupts in #NuttX RTOS ... By demuxing One Single IRQ into Multiple GPIOs

https://github.com/lupyuen/bl602_expander#handle-gpio-interrupt

How we attach a GPIO Interrupt Handler in our #BL604 GPIO Expander for #NuttX RTOS ... Only 1 Interrupt Hander per GPIO ... No Daisy Chaining for now 🌼⛓

https://github.com/lupyuen/bl602_expander#attach-gpio-interrupt

All future #ESP32 SoCs will be based on #RISCV instead of Xtensa

https://www.linkedin.com/posts/naveenpsofficial_embedded-espressif-esp32-activity-6924660740821835776-IQbN?utm_source=linkedin_share&utm_medium=android_app

#BL604 GPIO Expander for #NuttX calls the BL604 GPIO Driver to read GPIO Inputs and write GPIO Outputs ... Wonder what happens if we flip between Input and Output ... Like for #PineDio Stack's Push Button / Vibrator 🤔

https://github.com/lupyuen/bl602_expander#read-gpio

Our #BL604 GPIO Expander for #NuttX RTOS will configure the GPIO Interrupts: Rising Edge Trigger vs Falling Edge Trigger

https://github.com/lupyuen/bl602_expander#set-gpio-options

Our Grand Plan for syncing and testing Apache #NuttX RTOS on #PineDio Stack #BL604 ... Getting complicated 🤔

https://lupyuen.github.io/articles/pinedio2?88#automated-testing

At #NuttX Startup, our #BL604 GPIO Expander configures each Input / Output / Interrupt GPIO ... And registers the GPIOs as "/dev/gpioN"

https://github.com/lupyuen/bl602_expander#configure-gpio

Our #NuttX GPIO Expander for #BL604 implements these GPIO Operations: 1️⃣ Config / Read / Write GPIOs 2️⃣ Attach / Detach GPIO Interrupt Handlers 3️⃣ Handle GPIO Interrupts

https://github.com/lupyuen/bl602_expander#gpio-expander-operations

Apache #NuttX RTOS helpfully provides a Skeleton Driver for I/O Expander ... Let's flesh it out for #PineDio Stack #BL604

https://github.com/lupyuen/bl602_expander#gpio-expander

Someday our #NuttX GPIO Expander for #BL604 shall validate that the SPI / I2C / UART Pin Functions are correctly assigned to the GPIO Pin Numbers ... So SPI MISO must be either GPIO 0, 4, 8, 12, 16 or 20

https://github.com/lupyuen/bl602_expander#validate-pin-functions