Esp32 to tft lcd with micro sd

[mexodus]

[mexodus]

hi im making an lcd thats controlled by an esp32s2 devkitc-1

in short the display shows an image with som values that are clearly wrong but i dont really know how to fix it

#include <Arduino.h>
#include <SD.h>
#include <SPI.h>
#include <TFT_eSPI.h> // Hardware-specific library

TFT_eSPI tft = TFT_eSPI();       // Invoke custom library

#define TFT_WR  15  // Write strobe control pin - must use a pin in the range 0-31
#define TFT_DC  16  // Data Command control pin - must use a pin in the range 0-31  (LCD_RS on my display)
#define TFT_CS  17  // Chip select control pin
#define TFT_RST 18  // Reset pin
#define TFT_RD  7

#define TFT_D0  3   // Must use pins in the range 0-31 for the data bus
#define TFT_D1  8   // so a single register write sets/clears all bits
#define TFT_D2  14
#define TFT_D3  13
#define TFT_D4  12
#define TFT_D5  11
#define TFT_D6  10
#define TFT_D7  9

#define SD_CS   39
#define SD_MOSI 40
#define SD_MISO 41
#define SD_SCK  42

void setup() {
  Serial.begin(115200);
  while (!Serial) { delay(10); }

  tft.init();
  tft.setRotation(1);
  tft.fillScreen(TFT_GREEN);
  delay(2000);
  tft.fillScreen(TFT_BLUE);
  delay(2000);
  tft.fillScreen(TFT_RED);

  Serial.println("Initializing SD card...");

  // Manually define SPI pins
  SPI.begin(SD_SCK, SD_MISO, SD_MOSI, SD_CS);

  // Initialize SD card
  if (!SD.begin(SD_CS, SPI)) {
    Serial.println("SD Card initialization failed!");
    return;
  }

  Serial.println("SD Card initialized successfully.");

  // List files in the root directory
  File root = SD.open("/");
  printDirectory(root, 0);
}


void printDirectory(File dir, int numTabs) {
  while (true) {
    File entry = dir.openNextFile();
    if (!entry) {
      // No more files
      break;
    }
    
    for (int i = 0; i < numTabs; i++) {
      Serial.print("\t");
    }
    
    Serial.print(entry.name());
    
    if (entry.isDirectory()) {
      Serial.println("/");
      printDirectory(entry, numTabs + 1); // Recursive call for subdirectories
    } else {
      Serial.print("\t");
      Serial.print(entry.size(), DEC);
      Serial.println(" bytes");
    }
    
    entry.close();
  }
}


void drawBMP(const char *filename, int x, int y) {
  File bmpFile = SD.open(filename);
  if (!bmpFile) {
    Serial.println("File not found");
    return;
  }

  uint32_t dataOffset;
  bmpFile.seek(10);
  bmpFile.read((uint8_t*)&dataOffset, 4); // Read the pixel data offset from the BMP header

  uint16_t w = 480, h = 320; // Image dimensions
  uint8_t row[w * 3]; // BMP stores pixels in 24-bit RGB format
  uint16_t convertedRow[w]; // Converted to 16-bit color

  tft.startWrite();
  bmpFile.seek(dataOffset); // Move to the start of pixel data

  for (int16_t rowIndex = h - 1; rowIndex >= 0; rowIndex--) {
    bmpFile.read(row, w * 3);
    
    for (int i = 0; i < w; i++) {
      uint8_t b = row[i * 3];       // Blue channel
      uint8_t g = row[i * 3 + 1];   // Green channel
      uint8_t r = row[i * 3 + 2];   // Red channel
      convertedRow[i] = tft.color565(b, r, g);
    }
    
    tft.pushImage(x, y + rowIndex, w, 1, convertedRow);
  }

  tft.endWrite();
  bmpFile.close();
}

void loop() {
  drawBMP("/Civic.bmp", 0, 0);
  while (true); // Stop execution after drawing
}

[mexodus]

tft.color565(b, r, g);

right now wrong because i wanted to test if it would fix it (it did in fact not)

[van_der_decken]

@mexodus

convertedRow[i] = tft.color565(b, r, g);

Perhaps r, g, b?

[mexodus]

yeah i've tried but the image is still messed up

[mexodus]

im dumb