docs: def clear(self, fill = 0x00):
          """!
          \~english
          Clear buffer data and fill color into buffer
          @param fill: a color value, it will fill into buffer.<br>
                  The SSD1306 only chosen two colors: <br>
                     0 (0x0): black <br>
                     1 (0x1): white <br>
  
          \~chinese
          清除缓冲区数据并在缓冲区中填充颜色
          @param fill: 一个颜色值，它会填充到缓冲区中 <br>
                       SSD1306只能选择两种颜色： <br>
                          0（0x0）：黑色 <br>
                          1（0x1）：白色 <br>
          """
          self._buffer = [ fill ] * ( self.width * self._mem_pages )