ILLI9341 works fine - almost

[MHz000]

Unfortunately I still have a problem with an ILLI9341 display and the TFT_eSPI lib.

I'm using an esp32doit-devkit-v1 processor and compiling the 320x240/TFT_Meters example with VScode/PlatformIO
Everything works fine *) if I don't include the Users_Setup.h file and instead make the following entries in platformio.ini:
build_flags =
-D USER_SETUP_LOADED
-D ILI9341_DRIVER
-D TFT_MISO=19
-D TFT_MOSI=23
-D TFT_SCLK=18
-D TFT_CS=15
-D TFT_DC=2
-D TFT_RST=4
-D LOAD_GLCD=1
-D LOAD_FONT2
-D LOAD_FONT4 ; -1
-D LOAD_FONT6
-D LOAD_FONT7
-D LOAD_FONT8
-D LOAD_GFXFF
-D SMOOTH_FONT
-D SPI_FREQUENCY=27000000
lib_deps = bodmer/TFT_eSPI@^2.5.31

It makes me confident because it proves that the display and the wiring are fine.

After I adapted the User_Setup.h for the ILLY9341 in a second step, inserted of #include "User_Setup.h" in the main program and removed all build_flags from the platforio.in, the display unfortunately remains empty with a gray background.

here all active entries in User_Setup.h
#define USER_SETUP_INFO "User_Setup"
#define ILI9341_DRIVER // Generic driver for common displays
#define TFT_MISO 19
#define TFT_MOSI 23
#define TFT_SCLK 18
#define TFT_CS 15 // Chip select control pin
#define TFT_DC 2 // Data Command control pin
#define TFT_RST 4 // Reset pin (could connect to RST pin)
//#define TFT_RST -1 // Set TFT_RST to -1 if display RESET is connected to ESP32 board RST
#define TOUCH_CS 21 // Chip select pin (T_CS) of touch screen
#define LOAD_GLCD // Font 1. Original Adafruit 8 pixel font needs ~1820 bytes in FLASH
#define LOAD_FONT2 // Font 2. Small 16 pixel high font, needs ~3534 bytes in FLASH, 96 characters
#define LOAD_FONT4 // Font 4. Medium 26 pixel high font, needs ~5848 bytes in FLASH, 96 characters
#define LOAD_FONT6 // Font 6. Large 48 pixel font, needs ~2666 bytes in FLASH, only characters 1234567890:-.apm
#define LOAD_FONT7 // Font 7. 7 segment 48 pixel font, needs ~2438 bytes in FLASH, only characters 1234567890:-.
#define LOAD_FONT8 // Font 8. Large 75 pixel font needs ~3256 bytes in FLASH, only characters 1234567890:-.
//#define LOAD_FONT8N // Font 8. Alternative to Font 8 above, slightly narrower, so 3 digits fit a 160 pixel TFT
#define LOAD_GFXFF // FreeFonts. Include access to the 48 Adafruit_GFX free fonts FF1 to FF48 and custom fonts
#define SMOOTH_FONT
#define SPI_FREQUENCY 27000000
#define SPI_READ_FREQUENCY 20000000
#define SPI_TOUCH_FREQUENCY 2500000

There are no compile errors and upload works fine when the program starts. :-((

Thank you for every hint, maybe it will help other users as well

*) Solely tft.invertDisplay(x); would still have to be adjusted.

[Bodmer]

The Arduino working environment prevents #defines in the main program (sketch) from being visible to the library. I suspect the same problem occurs with PlatformIO. This is a build environment problem and not something I can solve.

To see if a setup is being picked up by the library, run the Read_User_Setup sketch.

[MHz000]

Thank you Bodmer for the extremely quick response. I tested the Read_User_setup sketch in two variants, one without #include "User_Setup.h" and one with it. Both variants show that you are right with your assumption. No values are taken from the compiler. Here is the result:

[code]
TFT_eSPI ver = 2.5.31
Processor = ESP32
Frequency = 240MHz
Transactions = Yes
Interface = SPI
Display driver = 9341
Display width = 240
Display Height = 320

MOSI = GPIO 13 //23 Values as set in User_Setup
MISO = GPIO 12 //19
SCK = GPIO 14 //18
TFT_CS = GPIO 15 //15
TFT_DC = GPIO 0 //2
TFT_RST = GPIO 2 //4

Font GLCD loaded
Font 2 loaded
Font 4 loaded
Font 6 loaded
Font 7 loaded
Font 8 loaded
Smooth font enabled

Display SPI frequency = 27.00
[/code]

I'm just a simple hobby C++ programmer who unfortunately doesn't understand anything about the inner workings of the Arduino or PlatformIO development environments.
There are countless examples of using your excellent library on the internet, mostly in the Arduino environment. I don't understand how their authors deal with the/my problem. Does the solution lie in using compiler directives? This works for me, although I have to admit that I copied this variant from an article on the net. What doesn't work yet is the assignment of the Touch_Pins and the correct assignment of the colors.
I would be happy about every useful hint so that I can use your library in my next project. It should be a touch panel where the labeling of the keys changes depending on the context.

Thank you for your explanation and support