I have a ST7796S MSP4021 320 x 480 TFT resistive touch screen being controlled by a ESP32
Could you help with the following problem:-
I thought it would be a could idea to use the following very basic example to test out a new display.
But I am having trouble with getting the LCD to display the correct colours, while it displays a rectangle it is not in red but yellow, Black is white and Blue is displayed as Cyan.
I have used RGB and BGR commands that did not sort the problems out.
Note1:- The screen resolution, rectangle and display orientation can all be adjusted correctly.
Note2;- I did think that this board had a 4-wire SPI interface but the example uses 3
Example
#include <Adafruit_GFX.h>    // Graphics library
// #include <Adafruit_ST7796.h> // ST7796 driver library
#include <Adafruit_ST7796S.h> // ST7796 driver library
// #include <Adafruit_ST77xx.h> // just for colo defs
 
// Define pin connections
#define TFT_CS    15  
#define TFT_RST   4
#define TFT_DC    2  
// #define TFT_MOSI  23  // SDA // HW MOSI
// #define TFT_SCLK  18  // SCL // HW SCLK
// #define TFT_MISO  19  // HW MISO
 
// Create an instance of the ST7796 display
 
Adafruit_ST7796S tft = Adafruit_ST7796S(TFT_CS, TFT_DC, TFT_RST);
void setup() {
  // Initialize serial communication for debugging
  Serial.begin(9600);
  Serial.println(“Initializing ST7796…”);
 
  // Initialize the display
 
  tft.init(320, 480); // Set resolution (e.g., 240×320)
 // tft.init(320, 480, ST7796S_RGB); // Set resolution (e.g., 240×320)
 // tft.init(320, 480, ST7796S_BGR); // Set resolution (e.g., 240×320)
  tft.setRotation(1); // Set display orientation (0-3)
 
  // Fill the screen with a color
  tft.fillScreen(ST77XX_BLUE);
 
  Serial.println(“Display initialized!”);
}
 
void loop() {
  // Draw a red rectangle
  tft.fillRect(50, 50, 100, 100, ST77XX_RED);
 
  // Add a delay
  delay(2000);
 
  // Clear the screen
  tft.fillScreen(ST77XX_BLACK);
 
  delay(2000);
}