from lcd.c:32
enum
{
LCD_FEAT_TEXT = 0x00,
LCD_FEAT_SIMPLE_SHAPES = 0x01,
LCD_FEAT_BASIC_BITMAP = 0x02,
LCD_FEAT_ULPM_DATA_ONLY = 0x03,
LCD_FEAT_ULPM_DATA_AND_CLOCK = 0x04,
LCD_FEAT_NB_MAX = 0x05,
};