4" ST7796a TFT Display is 90° from what should be normal

[JonRobert]

I have a "generic" 4" TFT LCD which is supposed to have a ST7796 control IC. (i say supposed as I don't yet know how to verify)

• I am using the 480 x 320 TFT_Elipse example in the TFT_eSPI library.
• I have the Arduino IDE v4.1
• My processor is a NodeMCU 1.0 (will be an ESP32C3 but still waiting)
• No other devices are connected to the setup

My issue is the display is rotated 90° from what it should be, with the TFT_Ellipse code un changed.

I changed the line " tft.setRotation(0); // originally was 1". Obtained the same results.
swapped the 480 and 320 in the Random ellipse lines. Same result.

Also a TFT_RED screen fill is Blue
A TFT_BLUE is red.

Where should I start looking. User_Setup.h file is in the library structure (and shown below)

Thanks
John

BTW. Thank you for your library. It seems it will be just what I need once the rotation thing is sorted out.

`//                            USER DEFINED SETTINGS
//   Set driver type, fonts to be loaded, pins used and SPI control method etc
//
//   See the User_Setup_Select.h file if you wish to be able to define multiple
//   setups and then easily select which setup file is used by the compiler.
//
//   If this file is edited correctly then all the library example sketches should
//   run without the need to make any more changes for a particular hardware setup!
#define USER_SETUP_ID 28

// ##################################################################################
//
// Section 0. Call up the right driver file and any options for it
//
// ##################################################################################

// Only define one driver
#define ST7796_DRIVER

// ##################################################################################
//
// Section 1. Define the pins that are used to interface with the display here
//
// ##################################################################################

// >>>> EDIT THE PIN NUMBERS IN THE LINES FOLLOWING TO SUIT YOUR ESP8266 SETUP   <<<<

// These are the recommended default

// Avoid PIN_D8 as this will prevent upload if display pulls the pin high at boot

// For NodeMCU - use pin numbers in the form PIN_Dx where Dx is the NodeMCU pin designation
#define TFT_CS   PIN_D8  // Chip select control pin D8   originally was D2
#define TFT_DC   PIN_D3  // Data Command control pin
#define TFT_RST  PIN_D4  // Reset pin (could connect to NodeMCU RST, see next line)
//#define TFT_RST  -1  // Set TFT_RST to -1 if the display RESET is connected to NodeMCU RST or 3.3V

//#define TOUCH_CS PIN_D1     // Chip select pin (T_CS) of touch screen

// ##################################################################################
//
// Section 2. Not used for ESP32
//
// ##################################################################################


// ##################################################################################
//
// Section 3. Define the fonts that are to be used here
//
// ##################################################################################

// Comment out the #defines below with // to stop that font being loaded
// The ESP8366 and ESP32 have plenty of memory so commenting out fonts is not
// normally necessary. If all fonts are loaded the extra FLASH space required is
// about 17Kbytes. To save FLASH space only enable the fonts you need!

#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

// Comment out the #define below to stop the SPIFFS filing system and smooth font code being loaded
// this will save ~20kbytes of FLASH
#define SMOOTH_FONT

// ##################################################################################
//
// Section 4. Not used
//
// ##################################################################################


// ##################################################################################
//
// Section 5. Other options
//
// ##################################################################################

// Define the SPI clock frequency, this affects the graphics rendering speed. Too
// fast and the TFT driver will not keep up and display corruption appears.
// With an RPi ST7796 MH4.0 display 80MHz is OK for ESP32, 40MHz maximum for ESP8266

// #define SPI_FREQUENCY  20000000
   #define SPI_FREQUENCY  40000000

#define SPI_TOUCH_FREQUENCY  2500000

// Comment out the following #define if "SPI Transactions" do not need to be
// supported. When commented out the code size will be smaller and sketches will
// run slightly faster, so leave it commented out unless you need it!

// Transaction support is needed to work with SD library but not needed with TFT_SdFat
// Transaction support is required if other SPI devices are connected.

// Transactions are automatically enabled by the library for an ESP32 (to use HAL mutex)
// so changing it here has no effect

#define SUPPORT_TRANSACTIONS
`

UPDATE-UPDATE---------------------------------------

I used Demo_3D_Cube as written with the same result.
I then added:

void setup() {
tft.init();

 h = tft.height();
 w = tft.width();

 Serial.begin(9600);
 delay(1000);
 Serial.println();
 Serial.println(USER_SETUP_ID);
 Serial.print("  h= ");
 Serial.print(h);
 Serial.print("  w= ");
 Serial.println(w);

 tft.setRotation(1);

 tft.fillScreen(TFT_BLACK);
 cube();
 fact = 180 / 3.14159259; // conversion from degrees to radians.
 Xoff = 240; // Position the centre of the 3d conversion space into the centre of the TFT screen.
 Yoff = 160;
 Zoff = 550; // Z offset in 3D space (smaller = closer and bigger rendering)
}

In the above setup the Serial.println(USER_SETUP_ID); so it has not yet read the USER_SETUP_ID or ??
Compilation error: 'USER_SETUP_ID' was not declared in this scope; did you mean 'USER_SETUP_INFO'?

h print = 320 and w = 240 should be h = 320 and w = 480
If I force 320 and 480 no difference in screen output.

[JonRobert]

Solved. I must have missed the instruction to copy the User_Setup.h to the \TFT_eSPI\ folder. The User_Setup.h was defaulting to the general on in the TFT_eSPI folder