Lup Yuen Lee 李立源 @lupyuen@qoto.org

Our #BL604 GPIO Expander for Apache #NuttX RTOS ... Works great with #LoRaWAN! 🎉

https://lupyuen.github.io/articles/expander?21#test-lorawan

Here's how we test our #BL604 GPIO Expander ... With #PineDio Stack's Touch Panel on Apache #NuttX RTOS

https://lupyuen.github.io/articles/expander?20#test-gpio-expander

Ideas for validating the #BL602 Pin Functions ... So that #NuttX Pin Definitions will be goof-proof 🤔

https://lupyuen.github.io/articles/expander?19#appendix-validate-pin-function

#BL602 is incredibly flexible for selecting GPIO Pin Functions ... But might be error-prone 🤔

https://lupyuen.github.io/articles/expander?17#pin-functions

Our GPIO Expander validates the #BL604 GPIO Pin Definitions at #NuttX Startup ... No more reusing pins by mistake! 👍

https://lupyuen.github.io/articles/expander?16#validate-gpio

Here's how we load our #BL604 GPIO Expander at #NuttX Startup

https://lupyuen.github.io/articles/expander?15#load-gpio-expander

GPIO Command works great for testing #BL602 GPIO Interrupts in the #NuttX Shell

https://lupyuen.github.io/articles/expander?11#gpio-command

Here's how we call our #BL604 GPIO Expander ... To attach an Interrupt Handler in Apache #NuttX RTOS

https://lupyuen.github.io/articles/expander?10#attach-interrupt-handler

#BL602 GPIO Interrupts are multiplexed to One Single GPIO IRQ ... Which is a little harder to handle on Apache #NuttX RTOS

https://lupyuen.github.io/articles/expander?9#bl602-evb-interrupt

Handling a #BL602 GPIO Interrupt on Apache #NuttX RTOS can get tricky ... Here's how we fixed it

https://lupyuen.github.io/articles/expander?8#gpio-interrupt

Here are the #NuttX GPIO Operations supported by our #BL604 GPIO Expander

https://lupyuen.github.io/articles/expander?7#gpio-operations

Apache #NuttX RTOS lets us create I/O Expanders that will manage many GPIOs ... Let's create one for #PineDio Stack #BL604

https://lupyuen.github.io/articles/expander?6#gpio-expander

Here's how we'll fix the #BL604 GPIOs on Apache #NuttX RTOS ... With our new GPIO Expander

https://lupyuen.github.io/articles/expander?5#overcome-the-limitations

#BL602 EVB manages GPIO Pins in an awkward way on Apache #NuttX RTOS 🤔

https://lupyuen.github.io/articles/expander?4#pin-definitions

#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