code: func (t *TM1638Driver) SetDisplayText(text string) {
  	data := t.fromStringToByteArray(text)
  	minLength := int(math.Min(8, float64(len(data))))
  	for i := 0; i < minLength; i++ {
  		t.SendChar(byte(i), data[i], false)
  	}
  }
docs: // SetDisplayText cuts and sends a string to the display (without dots)