Arduino function to scroll a String on an Adafruit 8x16 LED Matrix FeatherWing

scrollMatrixString.ino

// 8x16 LED Matrix I2C FeatherWing
#define MATRIX_ADDR 0x70 // default; 0x71-0x77 with jumper changes
Adafruit_8x16minimatrix matrixDisplay = Adafruit_8x16minimatrix();

setup() {
  matrixDisplay.begin(MATRIX_ADDR); // void
}

void scrollMatrixString(String tString, int scrollDelay, int bright, int rot, int tSize, boolean tWrap, int tColor) {
  int tLength = tString.length();
  matrixDisplay.setBrightness(bright);
  matrixDisplay.setRotation(rot);
  matrixDisplay.setTextSize(tSize);
  matrixDisplay.setTextWrap(tWrap);
  matrixDisplay.setTextColor(tColor);
  // TextSize=1 characters are 6 pixels wide (matrix landsacpe)
  // TextSize=2 characters are 12 pixels wide (matrix portrait)
  for ( int x = matrixDisplay.width(); x > (-6 * tSize * tLength); x-- ) {
    matrixDisplay.clear();
    matrixDisplay.setCursor(x, 0);
    matrixDisplay.print(tString);
    matrixDisplay.writeDisplay();
    delay(scrollDelay);
  }
}