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

Our #NuttX Driver for #PineDio Stack's Touch Panel returns 4 possible states: Touch Down vs Touch Up, Valid vs Invalid

https://github.com/lupyuen/cst816s-nuttx#read-touch-data

Here's how our #NuttX Driver reads the Touch Data on #PineDio Stack #BL604

https://github.com/lupyuen/cst816s-nuttx#read-touch-data

Apache #NuttX RTOS has a standard data format for Touch Input ... Let's implement this for #PineDio Stack #BL604

https://github.com/lupyuen/cst816s-nuttx#touch-data

Tapping the screen on #PineDio Stack #BL604 ... Correctly triggers a GPIO Interrupt on #NuttX RTOS! 🎉

https://github.com/lupyuen/cst816s-nuttx#test-gpio-interrupt

#PineDio Stack's Touch Panel triggers a GPIO Interrupt when we tap the screen ... Here's how we handle the GPIO Interrupt in #NuttX

https://github.com/lupyuen/cst816s-nuttx#gpio-interrupt

xkcd: Weird Unicode Math Symbols (and their meanings)

https://m.xkcd.com/2606/

Just realised I've been using #PineDio Stack #BL604 @PINE64 sideways all along 😂

https://github.com/lupyuen/cst816s-nuttx#screen-is-sideways

#BL602 GPIO issues on #NuttX ... Stay vigilant! 👍

https://github.com/apache/incubator-nuttx/issues/5810#issuecomment-1098633538

#PineDio Stack's CST816S Touch Panel is a peculiar I2C Device ... It won't respond to I2C Scan unless we tap the screen and wake it up!

https://github.com/lupyuen/cst816s-nuttx#i2c-scan

#NuttX Driver for Cypress MBR3108 Touch Controller looks structurally similar to #PineDio Stack's CST816S ... So we copy-n-paste into our CST816S Driver

https://github.com/lupyuen/cst816s-nuttx#cypress-mbr3108

Now coding the #PineDio Stack #BL604 Touch Panel Driver for Apache #NuttX RTOS 😬 ... Same I2C Touch Panel as PineTime

https://github.com/lupyuen/cst816s-nuttx

Upcoming Features for #NuttX RTOS on #PineDio Stack #BL604 ... Lots to do!

https://lupyuen.github.io/articles/pinedio2?31#upcoming-features

Automated Testing on #PineDio Stack #BL604

https://lupyuen.github.io/articles/pinedio2?30#automated-testing

We need SPI DMA on #BL602 for better multitasking

https://lupyuen.github.io/articles/pinedio2?29#spi-direct-memory-access

2 types of SPI Flash on #PineDio Stack #BL604 ... Wonder why 🤔

https://lupyuen.github.io/articles/pinedio2?28#spi-flash

Porting #PineDio Stack #BL604's Touch Panel Driver to Apache #NuttX RTOS

https://lupyuen.github.io/articles/pinedio2?26#touch-panel

Push Button on #PineDio Stack #BL604 will appear as "/dev/buttons"

https://lupyuen.github.io/articles/pinedio2?25#push-button

Handling 23 GPIOs on #BL604 with Apache #NuttX RTOS ... GPIO Expander can help!

https://lupyuen.github.io/articles/pinedio2?23#gpio-expander

#NuttX Features bundled for #PineDio Stack #BL604

https://lupyuen.github.io/articles/pinedio2?27#appendix-bundled-features

All 23 GPIOs used by #PineDio Stack #BL604 ... Interesting muxing! 🤔

https://lupyuen.github.io/articles/pinedio2?24#appendix-gpio-assignment