ESP32-S3 RGB LED Matrix test for RGB, GRB setting

/*
 * =====================================================================================
 * 8x8 RGB MATRIX - COLOR ORDER TESTER
 📚⬇️ Download and resource page https://robojax.com/RJT841
 Full youTube video: https://youtu.be/XEZLyznWmYM
 * =====================================================================================
 * This script helps you verify if your matrix matches the 'NEO_RGB' setting.
 * - Displays 'R' in Red
 * - Displays 'G' in Green
 * - Displays 'B' in Blue
 * * If 'R' shows up as Green or Blue, you need to change the configuration line:
 * e.g., NEO_GRB + NEO_KHZ800  OR  NEO_RGB + NEO_KHZ800
 * =====================================================================================
 */

#include <Adafruit_GFX.h>
#include <Adafruit_NeoMatrix.h>
#include <Adafruit_NeoPixel.h>

#define MATRIX_PIN 14

// --- USER SETTINGS ---
const int TEST_DELAY = 2000;      // Time in milliseconds between colors
const int TEST_BRIGHTNESS = 30;   // Set brightness (0 to 255)

// Define the matrix - change NEO_RGB to NEO_GRB if colors are swapped
Adafruit_NeoMatrix matrix(8, 8, MATRIX_PIN,
  NEO_MATRIX_TOP    + NEO_MATRIX_LEFT +
  NEO_MATRIX_ROWS   + NEO_MATRIX_PROGRESSIVE,
  NEO_RGB           + NEO_KHZ800);

void setup() {
  matrix.begin();
  matrix.setTextWrap(false);
  matrix.setBrightness(TEST_BRIGHTNESS);
}

void loop() {
  // 1. TEST RED
  matrix.fillScreen(0);
  matrix.setTextColor(matrix.Color(255, 0, 0)); // Red
  matrix.setCursor(1, 0);
  matrix.print("R");
  matrix.show();
  delay(TEST_DELAY);

  // 2. TEST GREEN
  matrix.fillScreen(0);
  matrix.setTextColor(matrix.Color(0, 255, 0)); // Green
  matrix.setCursor(1, 0);
  matrix.print("G");
  matrix.show();
  delay(TEST_DELAY);

  // 3. TEST BLUE
  matrix.fillScreen(0);
  matrix.setTextColor(matrix.Color(0, 0, 255)); // Blue
  matrix.setCursor(1, 0);
  matrix.print("B");
  matrix.show();
  delay(TEST_DELAY);
}