menu, sub.menu structure with lcd

Calamar · Posted: Mon Jul 04, 2005 4:43 pm

I would like a exmaple in C, how to create
a menu, sub-menu I'll display it in
standar LCD.
_________________
Best Regards
Daniel H. Sagarra
La Plata (Argentina)

Mark · Joined: 07 Sep 2003 Posts: 2838 Location: Atlanta, GA

Search the forum and you should find some stuff. Here is a post showing show to use pointers to functions to do a menuing system. Its up to you to decide what to do with the menus though

http://www.ccsinfo.com/forum/viewtopic.php?t=20416&postdays=0&postorder=asc&highlight=menu&start=15

valemike · Guest

I've implemented a menu using a switch-case state machine. Scrolling up and down will bring you to the next or previous state.

Then if you want a submenu, then you'll have to save your current state and initialize a new menu state machine.

Mark · Joined: 07 Sep 2003 Posts: 2838 Location: Atlanta, GA

I create a const data struct that contains many things about a menu entry. What to do if you press a certain button (function pointers), menu text, ...., and the "parent menu" id. With this, there is no need to save the current state since you will know where to go when the user hits the back or up button.

Guest · Posted: Thu Jul 07, 2005 12:01 pm

I also I'm designing a user interface and would like to use function pointers. I'm a little confussed after reading the posts. Does the compiler fully support pointers to functions? What are the limitations? Can they be used inside of a structure?

Any input that you guys have would be great.

Thanks,

Joel

Mark · Joined: 07 Sep 2003 Posts: 2838 Location: Atlanta, GA

The compiler doesn't like const pointers to functions. The post I made was a work around for that. If you read the post, you will see that I did use them in a struct.

Guest · Posted: Thu Jul 07, 2005 12:14 pm

I wanted something more portable. Does CCS no about this limitation? I think that there offical statement is that they completely support pointers to functions.

Mark · Joined: 07 Sep 2003 Posts: 2838 Location: Atlanta, GA

Then you will need to use a different compiler.

Guest · Posted: Thu Jul 07, 2005 12:20 pm

Thanks for you input Mark,

Hopefully in time they will fix some parts of the compiler......

Mark · Joined: 07 Sep 2003 Posts: 2838 Location: Atlanta, GA

They will have to make the decision to allow pointers to consts.