************************ mneu.h ***************************
#ifndef menu_h
#define menu_h

struct MENU;

struct MENU_ENTRY 
{
  const unsigned char *Entry_Name;
  const struct MENU          *SubMenu;
  void ( *Function )(void);
};

struct MENU
{
  const unsigned char *Menu_Name;
  int                  NrEntries;
  const struct MENU_ENTRY          *Entries;
};

// Texte der Menüeinträge
// Strings Mainmenue
static const char menu_main_str[] PROGMEM = "Hauptmenue";
static const char menu_set_str[] PROGMEM = "Einstellungen";
static const char menu_par_str[] PROGMEM = "Parameter";
// Strings Settingsmenue
static const char set1_str[] PROGMEM = "Set 1";
static const char set2_str[] PROGMEM = "Set 2";
// Strings Parametermenue
static const char par1_str[] PROGMEM = "Par 1";
static const char par2_str[] PROGMEM = "Par 2";
static const char exit_str[] PROGMEM = "Exit";

extern void update_menue(void);
extern void update_display(void);
extern void func0(void);
extern void func1(void);
extern void func2(void);
extern void func3(void);
extern void getback(void);
#endif

********************************** menu.c *********************************

UINT ActEntry = 0;
UINT ActEntryOld = 0;

char HelpStr[16];
// --------------------------- prototypes ------------------------------------

// ---------------------------------------------------------------------------

const struct MENU_ENTRY MENU_SET_ENTRIES[] ={
  { set1_str, NULL, func0 },
  { set2_str, NULL, func1 },
  { exit_str, NULL, getback }
};

const struct MENU MENU_SET ={
    menu_set_str, 
	sizeof( MENU_SET_ENTRIES ) / sizeof( *MENU_SET_ENTRIES ), 
	MENU_SET_ENTRIES
};

const struct MENU_ENTRY MENU_PAR_ENTRIES[] ={
  { par1_str, NULL, func2 },
  { par2_str, NULL, func3 },
  { exit_str, NULL, getback }
};

const struct MENU MENU_PAR ={
    menu_par_str,
    sizeof( MENU_PAR_ENTRIES ) / sizeof( *MENU_PAR_ENTRIES ),
    MENU_PAR_ENTRIES
};

const struct MENU_ENTRY MENU_MAIN_ENTRIES[] ={
  { menu_set_str, &MENU_SET, NULL },
  { menu_par_str, &MENU_PAR, NULL }
};

const struct MENU MENU_MAIN = {
    menu_main_str, 
    sizeof( MENU_MAIN_ENTRIES ) / sizeof( *MENU_MAIN_ENTRIES ),
    MENU_MAIN_ENTRIES
};

//und zuguter letzt haben wir noch den Pointer
//auf das zunächst oberste Menü:

const struct MENU *ActMenu = &MENU_MAIN;


void update_menue(void)	// Die Menüfunktionen
{
if( get_key_press( 1<<KEY_UP )) // Taste + gedrückt?
	{
	ActEntry ++;
	}
if( get_key_press( 1<<KEY_DWN )) // Taste - gedrückt?
    {
	ActEntry --;
	}
if( ActEntry < 0 )
    ActEntry = 0;

if( ActEntry >= ActMenu->NrEntries)	// Begrenzung auf max Anzahl der Entries
    ActEntry = ActMenu->NrEntries - 1;

if( get_key_press( 1<<KEY_ENT )) { // Taste Enter gedrückt?
	if( ActMenu->Entries[ActEntry].SubMenu != NULL ) 
	{
    ActMenu = ActMenu->Entries[ActEntry].SubMenu;
    ActEntry = 0;
    update_display();
	}
	else if( ActMenu->Entries[ActEntry].Function != NULL ) {
      ActMenu->Entries[ActEntry].Function();
	}
}

if( ActEntry != ActEntryOld)
	update_display();
}


void update_display(void)    // Update der Anzeige

{
	lcd_clrscr();
	lcd_gotoxy(0,0);
	strcpy_P(HelpStr, ActMenu->Menu_Name);
    lcd_puts(HelpStr);
	lcd_gotoxy(0,1);
	strcpy_P(HelpStr, ActMenu->Entries[ActEntry].Entry_Name);
    lcd_puts(HelpStr);
	ActEntryOld = ActEntry;
}


//Menüfunktionen
void func0(void)
{
lcd_gotoxy(0,2);
lcd_puts("Funktion 1");
}
void func1(void)
{
lcd_gotoxy(0,2);
lcd_puts("Funktion 2");
}
void func2(void)
{
lcd_gotoxy(0,2);
lcd_puts("Funktion 3");
}
void func3(void)
{
lcd_gotoxy(0,2);
lcd_puts("Funktion 4");
}
void getback(void)
{
ActMenu = &MENU_MAIN;
}