void lcd_blit_mono(const unsigned char *data, int x, int by, int width,
                   int bheight, int stride)
{
    if (lcd_initialized)
    {
        while (bheight--)
        {
            lcd_write_command(LCD_SET_PAGE | (by & 0xf));
            lcd_write_command_e(LCD_SET_COLUMN | ((x >> 4) & 0xf), x & 0xf);

            lcd_mono_data(data, width);
            data += stride;
            by++;
        }
    }
}