private:
    const int8_t m_dc = -1;                       ///< data/command pin for SPI, -1 for i2c
    NanoDisplayBase<InterfacePCD8544<I>> &m_base; ///< basic lcd display support interface
    uint8_t m_width = 0;
    uint8_t m_column = 0;
    uint8_t m_page = 0;
