Re: [avr-gcc-list] calling function pointers via pointers ?

[Vincent Trouilliez]

On Thu, 2005-09-29 at 16:20 +0200, David Brown wrote:
> You're getting very close now - don't give up!
> 
> David


Thanks again David for the detailed review, and thanks everyone else :-)
The "forward declaration" did the trick indeed, magic ! :o)
So now the definition of my menus look like this. I added another one to
simulate a sub menu, and now I just need to find the correct syntax to
initialise a pointer in the main menu, with the address of the sub
menu. 


const menu __ATTR_PROGMEM__ ui_menu_sub = {
        "___SUB MENU TEST____",
        6,      //there are 6 entries in this menu
        {{"Sub A", ui_menu_test_fn, NULL },
         {"Sub B", ui_menu_test_fn, NULL },
         {"Sub C", ui_menu_test_fn, NULL },
         {"Sub D", ui_menu_test_fn, NULL },
         {"Sub E", ui_menu_test_fn, NULL },
         {"Sub F", ui_menu_test_fn, NULL }}
};

const menu __ATTR_PROGMEM__ ui_menu_main = {
        "______ALPHABET______",
        6,      //there are 6 entries in this menu
        {{"Letter A", ui_menu_test_fn, NULL },
         {"Letter B", ui_menu_test_fn, NULL },
         {"Letter C", ui_menu_test_fn, NULL },
         {"Letter D", ui_menu_test_fn, NULL },
         {"Letter E", ui_menu_test_fn, NULL },
         {"Letter F", NULL , &ui_menu_sub }}
};


I tried the '&' sign, but I get this error:

ui.c:63: warning: initialization discards qualifiers from pointer target
type

I am really lost as to how to specify the address of menu_sub in
ui_menu_main....




About my naming "style", well yours certainly look a lot more
"professional" than mine, I quite like it, I think I will adopt it ! I
will work on it, as it's important to make the code readable, plus, it
just looks better anyway...

Indentation: yes sure I do indent... no idea why it got lost in the
mail :-/


Well, once I manage to initialise the main menu with the address of the
sub menu, I will be ready for the final big test.... try to actually run
the sub menu, that is, is my ui_menu_run() function (the one that's in
charge of displaying a menu), re-entrant or not ! No-idea ! I think
either it will work first time, or it will screw up big time, but I
don't think there is much space for nuances in between !! :-P



--
Vince