LVGL Test App calls read() repeatedly on #PineDio Stack's Touch Panel Driver to get Touch Data ... But it should call poll() instead to block on Touch Data 🤔

https://github.com/lupyuen/cst816s-nuttx#read-touch-data-1

Touch Coordinates read over I2C from #PineDio Stack Touch Panel ... Are returned unchanged to the LVGL Test App as a #NuttX Touch Down Event

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

But for Touch Up Events the Touch Coordinates are invalid ... Our #PineDio Stack driver patches the Touch Coordinates with the data from the last Touch Down Event

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

Our #NuttX Driver for #PineDio Stack Touch Panel won't return any valid Touch Data unless we enable I2C Logging ... Could be an I2C Timing Issue or Race Condition 🤔

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

Upcoming fixes for Apache #NuttX RTOS on #PineDio Stack #BL604 🤔

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

Apache #NuttX RTOS on #PineDio Stack #BL604 now supports Touch Screen ... Works OK with LoRaWAN too! 👍

https://github.com/lupyuen/incubator-nuttx/pull/59

Building the Touch Panel Driver for Apache #NuttX RTOS on #PineDio Stack #BL604 @PINE64 ... All shall be explained in this article

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

#PineDio Stack's CST816S Touch Panel seems elusive ... Thanks to PineTime we know everything now!

https://lupyuen.github.io/articles/touch?2#cst816s-touch-panel

Connecting #PineDio Stack's CST816S Touch Panel to Apache #NuttX RTOS

https://lupyuen.github.io/articles/touch?3#cst816s-pins

What's inside a #NuttX Touchscreen Driver

https://lupyuen.github.io/articles/touch?4#nuttx-touchscreen-drivers

Apache #NuttX RTOS defines a standard data format for Touch Data

https://lupyuen.github.io/articles/touch?5#touch-data

How our #NuttX App reads the touched coordinates from #PineDio Stack's Touch Panel

https://lupyuen.github.io/articles/touch?6#read-touch-data

Here's how we load the #NuttX Touch Panel Driver on #PineDio Stack #BL604

https://lupyuen.github.io/articles/touch?7#load-the-driver

Initialising the Touch Panel Driver on #PineDio Stack #BL604

https://lupyuen.github.io/articles/touch?8#initialise-driver

#PineDio Stack's Touch Panel will trigger a GPIO Interrupt when touched ... Here's how we handle the interrupt on Apache #NuttX RTOS

https://lupyuen.github.io/articles/touch?9#gpio-interrupt

Testing the GPIO Interrupt that's triggered ... When we tap #PineDio Stack's CST816S Touch Panel

https://lupyuen.github.io/articles/touch?10#test-gpio-interrupt

Here's the Touch Data returned by #PineDio Stack's CST816S Touch Panel

https://lupyuen.github.io/articles/touch?11#fetch-touch-data

Reading the Touch Data from #PineDio Stack's CST816S Touch Panel

https://lupyuen.github.io/articles/touch?12#get-i2c-touch-data