Quelltext der Seite WSAL13587 – 4inch TFT Touch Shield/en

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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

== Summary ==
Technical overview of the Waveshare 4inch TFT touch shield: ILI9486 display controller, XPT2046 touch chip, SPI connection and demo programs for Arduino and STM32.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL13587 WSAL13587 – 4inch Touch LCD Shield for Arduino]

== Technical overview ==
* The module uses the ILI9486 LCD controller and is initialized over the SPI interface; the initialization routines are located in LCD_Driver.cpp.
* Touch control uses the XPT2046 chip; related functions are in LCD_Touch.cpp.
* For Arduinos with an ICSP header (e.g., UNO), leave the SPI config switch on the ICSP side; without ICSP, set it to SCLK/D13, MISO/D12, MOSI/D11.
* The demo projects cover three folders: LCD_Show (shapes and patterns), LCD_ShowBMP (BMP image display via SD card) and LCD_Touch (drawing board).
* To show a BMP image, copy the files into the root directory of a FAT-formatted SD card; images must be 480×320 pixels at 24-bit color depth in BMP format.
* The bundled font library provides five sizes: font8 (5×8), font12 (7×12), font16 (11×16), font20 (14×20) and font24 (17×24).
* The vendor also ships the Image2Lcd tool for converting images into array data, plus Zimo221 as a font-extraction utility.
* On the STM32 side, the demo was tested on an XNUCLEO-F103RB (STM32F103RBT6); demos use the HAL library and call GUI_Show, LCD_Show_bmp and TP_DrawBoard sequentially in the main program.

'''Commands and examples – verify before use:''' 
<syntaxhighlight lang="text">
System_Init();
LCD_Init(Lcd_ScanDir, 200);
SD_Init();
LCD_ShowBMP();
TP_Init(Lcd_ScanDir);
TP_GetAdFac();
TP_Dialog();
TP_DrawBoard();
</syntaxhighlight>

== Notes and version constraints ==
* The source does not provide exact voltage, current or temperature values; electrical specifications should be taken from the ILI9486 / XPT2046 datasheets.
* Compatibility with microcontrollers other than UNO / XNUCLEO-F103RB is not documented and must be checked per pin mapping.
* Demo version and required Arduino IDE version are not stated; updates may change behavior.
* The SD card must be placed in the root directory – subfolders are not supported according to the source; verify before testing.
* No warranty, certification or safety information is present in the source; these points require human confirmation from the supplier.

== Source and revision record ==
* [https://www.waveshare.com/wiki/4inch_TFT_Touch_Shield 4inch TFT Touch Shield - Waveshare Wiki]
* Source revision: 100979
* Captured: 2026-08-30T03:54:18+00:00
* SHA-256: <code>7a0263b66963316909e0c4891e96488ce5b47046ed0de867daea3426bb879ebe</code>