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Menu on LCD with pic how to?

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This is should be very easy to do and create
But what do you know about pics and LCD
what language do you want to use picbasic ASM or c
 

Hi Wizpic,

I´m begining but i have a little knowledge on pic and lcd, i already made many projects with this microcontrollers family, i program in assembler and i´m also learning C , but I am geting hard to make this menu with some sub-menus inside.
It would be something like this.

Main menu

Function 1
config x
config y

Function 2
check y
check x

Function 3
...
...

Thank you again
Elson
 

About the LCD coding I can suggest to you to take a look at this post:



Bye
Pow
 

Hi
Creating a menu is fairly easy. Create an array of menu structs (record). The struct should look something like this:

typedef struct
{
char LcdString[20]; // what to display
char MenuIndex[2]; // Contains index of 'sub' menu - 0 if no sub menu
char Size[2]; // Indicates how many entries in this menu section - Only top of each menu has value - others = 0
.....other variables as required
}MenuRec_t;



If up or down arrow pressed move to next/previous record. If enter pressed jump to sub menu @ index. The other variables could be passed to a switch / case statement to determine what should happen if this menu entry is selected. Obviously there is quite a bit that I have not explained but this should give you an idea how to get started
 
You can try by implementing a FSM (Finite State Machine) trough the use of switch statement. In order to help the code writing draw the menu structure and identify each menu with a state.
To gain more info on the subject take a look at this link:

https://en.wikipedia.org/wiki/Finite_state_machine

There are also automatic tool able to generate the C code from a visual view of the FSM, to give you an example look at the attached menu structure, the generated code will be this one (from HFSM Editor a free FSM code generator
https://robertolanuza.tripod.com/fsm/fsm.htm).
Into the example below I've supposed to use arrow key to navigate trough the menu structure and ok to execute a selected menu option.

Code: 
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//  Automatic generated C-code by the application:
//     HFSM Editor v1.4r3
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Methodology: Hierarchical Switch-case state. [v1.5r1]
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Exported function: void FSM_0001(void);
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Initialization proposed by the user (Start).
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  key == left

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Initialization proposed by the user (End).
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Entry flags (Start).
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Entry flags (End).
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Automatic initialization (Start).
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 // States index.
  #define  i_STATE_1   ((T_u8)0)
  #define  i_STATE_2   ((T_u8)1)
  #define  i_STATE_21  ((T_u8)2)
  #define  i_STATE_22  ((T_u8)3)
  #define  i_STATE_3   ((T_u8)4)
  #define  i_STATE_31  ((T_u8)5)
  #define  i_STATE_32  ((T_u8)6)

 // Index variable.
static T_u8 ind_FSM_0001 = i_STATE_1;

// Macros & functions.
// Force the FSM to the initial state.
#define FSM_0001_Init() { ind_FSM_0001 = i_STATE_1; }

// This is not a history FSM.
#define _FSM_0001_Init()  {FSM_0001_Init(); /* Children: */ }

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Automatic initialization (End).
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Local child functions  (Start).
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Local child functions  (End).
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// FSM dispatcher function to be called by the O.S.
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
void FSM_0001(void)
{
    // Next state analyser.
    switch(ind_FSM_0001){
        case i_STATE_1:
            // State actions (Moore).
            WriteLCD("Welcome!");
            // Next state selection.
            if(key == down){
                // Pointing to the next state.
                ind_FSM_0001 = i_STATE_2;
            }
        break;
        case i_STATE_2:
            // State actions (Moore).
            WriteLCD("Menu1");
            // Next state selection.
            if(key == up){	// [1].
                // Pointing to the next state.
                ind_FSM_0001 = i_STATE_1;
            }else if(key == right){	// [2].
                // Pointing to the next state.
                ind_FSM_0001 = i_STATE_21;
            }else if(key == down){	// [3].
                // Pointing to the next state.
                ind_FSM_0001 = i_STATE_3;
            }
        break;
        case i_STATE_21:
            // State actions (Moore).
            WriteLCD("Submenu 1");
            // Next state selection.
            if(key == left){	// [1].
                // Pointing to the next state.
                ind_FSM_0001 = i_STATE_2;
            }else if(key == ok){	// [2].
                // Pointing to the next state.
                ind_FSM_0001 = i_STATE_22;
            }
        break;
        case i_STATE_22:
            // State actions (Moore).
            ExecuteSubMenu1();
            // Next state selection.
            {
                // Pointing to the next state.
                ind_FSM_0001 = i_STATE_1;
            }
        break;
        case i_STATE_3:
            // State actions (Moore).
            WriteLCD("Menu2");
            // Next state selection.
            if(key == up){	// [1].
                // Pointing to the next state.
                ind_FSM_0001 = i_STATE_2;
            }else if(key == down){	// [2].
                // Pointing to the next state.
                ind_FSM_0001 = i_STATE_1;
            }else if(key == right){	// [3].
                // Pointing to the next state.
                ind_FSM_0001 = i_STATE_31;
            }
        break;
        case i_STATE_31:
            // State actions (Moore).
            WriteLCD("Submenu 2");
            // Next state selection.
            if(key == left){	// [1].
                // Pointing to the next state.
                ind_FSM_0001 = i_STATE_3;
            }else if(key == ok){	// [2].
                // Pointing to the next state.
                ind_FSM_0001 = i_STATE_32;
            }
        break;
        case i_STATE_32:
            // State actions (Moore).
            ExecuteSubmenu2();
            // Next state selection.
            {
                // Pointing to the next state.
                ind_FSM_0001 = i_STATE_1;
            }
        break;
    }
}


//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Ending code proposed by the user (Start).
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Ending code proposed by the user (End).
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//  End of the automatic generated C-code.
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

With very little modification you can immediatly use the code inside your program in order to setup this simple menu.

Hope it help.

Bye
Pow
 
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