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yuri91 / ili9341-rs

A WIP, no_std, generic driver for the ILI9341 (and ILI9340C) TFT LCD display
Apache License 2.0
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Question: how to read touch screen input ? #42

Closed ValouBambou closed 7 months ago

ValouBambou commented 7 months ago

Hi, I'm kind of new to embedded programming and I managed to use embassy + embedded_graphics to connect a Raspberry Pi Pico to an ili9341 for displaying stuff, but I can't find how to read the touch screen input using this library. From what I understand the touch part is connected through a different SPI bus, thus I should send command and data to this bus, but I don't understand what to send in order to read the optional x y coordinates of the touched area on the touch screen. If the feature is missing, I could implement it.

yuri91 commented 7 months ago

I believe that the touch screen, as you say, is on a different spi device. And the ili9341 devices that I have do not even have it.

So I think that it's out of scope for this library to implement it. Another library can implement the touch screen driver and be used together with this for the display functionality.

ValouBambou commented 7 months ago

This makes sense, I apologize for my dumb question you're right the touch screen is a different device that's included in the display, it's a XPT2046 controller so now I can reuse the other code from embassy example that's using this exact same touching device. Thanks for your insight !

yuri91 commented 7 months ago

No worries and good luck!