Constructor when using software SPI not working with ESP32

[BaltasarParreira]

My setup has a different TFT pinout so I have to use these constructor so I can pass the pins IT uses like these:

// Pins for the ILI9341
#define TFT_DC 2
#define TFT_CS 15
#define TFT_LED 21 // To control backlight led
// New TFT Custom Pins
#define TFT_MISO 12
#define TFT_MOSI 13
#define TFT_SCLK 14
#define TFT_RST -1 // It's directly connected to 3,3v

ILI9341_SPI tft = ILI9341_SPI(TFT_CS, TFT_DC, TFT_MOSI, TFT_SCLK, TFT_RST, TFT_MISO);

But it's not working and the screen stays all white with just the background led light and nothing else.

I'm using the latest Arduino IDE (2.3.5) with ESP32 3.3.8 and this latest library version (1.2.6).
As an additional information, using the "Adafruit_ILI9341" library that has sort of the same syntax all works ok without problems.

Anyone can check this?
Is there a bug with the implementation of these software SPI constructor?
Any workaround or solutions I can use?

Thanks.

[PatrickWever]

Hi,

Looks like you are using a CYD. I love the minigrafx library and ran into the same problem with my CYD. The library works fine for my ESP8266 and Lolin C3 mini (ESP32), however not for the CYD.
The problem is the software SPI, it is just not working. We need the hardware SPI, but it is missing the correct pin definitions. The file ILI9341_SPI.cpp needs another definition for the hardware pins:

SPI.begin(_sclk, _miso, _mosi, -1);

The library was now working, however with a partial screen and wrong colors. I had to reverse height and width and the colors were bgr iso rgb.
To make it work with the CYD and other boards, I used ifdef with ARDUINO_ESP32_2432S028R.

In conclusion, to make it work with the CYD:

1. Replace the following file in the minigrafx library:
   ILI9341_SPI.cpp

2. Replace the following in ILI9341_SPI.h:
   #define ILI9341_TFTWIDTH 240
#define ILI9341_TFTHEIGHT 320
   with
   #ifdef ARDUINO_ESP32_2432S028R
#define ILI9341_TFTWIDTH 320 //240 Reversed for CYD
#define ILI9341_TFTHEIGHT 240 //320
#else
#define ILI9341_TFTWIDTH 240
#define ILI9341_TFTHEIGHT 320
#endif

3. Use the following constructor:
   ILI9341_SPI tft = ILI9341_SPI(CYD_TFT_CS, CYD_TFT_DC);

4. Change the color palette in your sketch from rgb to bgr:
   uint16_t rgb2bgr(uint16_t color) {
uint16_t red = (color >> 11) & 0x1F; // 5 bits for red
uint16_t green = (color >> 5) & 0x3F; // 6 bits for green
uint16_t blue = color & 0x1F; // 5 bits for blue
// Swap red and blue positions
return (blue << 11) | (green << 5) | red;
}

uint16_t palette[] = {
ILI9341_BLACK, // 0
ILI9341_WHITE, // 1
rgb2bgr(ILI9341_ORANGE), // 2
rgb2bgr(ILI9341_CYAN)}; //3
   `

5. Use board ESP32-2432S028R CYD to compile your sketch. It is from jczn and in the Espressif ESP32 library. This is the same as the ESP32- DEV, however the pins are already defined. I used upload speed 115200.

Good luck