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	- Project: "Button Navigation"
	- Source Code NOT compiled for: Arduino Uno
	- Source Code created on: 2024-06-11 08:57:20

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* Lcd 20x4 i2c  Switch case menu with submenu */
	/* Button up  Button down  Button select */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>  //https://github.com/marcoschwartz/LiquidCrystal_I2C

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void displayMenu(void);
void navigateMenu(void);

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t UP_BUTTON_PushButton_PIN_D2    = 2;
const uint8_t DOWN_BUTTON_PushButton_PIN_D3  = 3;
const uint8_t ENTER_BUTTON_PushButton_PIN_D4 = 4;

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
LiquidCrystal_I2C lcd(0x27, 20, 4);  // set the LCD address to 0x27 for a 20 chars and 4 line display

/****** MENU VARIABLES *****/
int menuIndex = 0;
int subMenuIndex = 0;
bool inSubMenu = false;

const char* mainMenu[] = {"Option 1", "Option 2", "Option 3"};
const char* subMenu1[] = {"Submenu 1-1", "Submenu 1-2"};
const char* subMenu2[] = {"Submenu 2-1", "Submenu 2-2"};
const char* subMenu3[] = {"Submenu 3-1", "Submenu 3-2"};

void setup(void)
{
    // put your setup code here, to run once:
    pinMode(UP_BUTTON_PushButton_PIN_D2,    INPUT_PULLUP);
    pinMode(DOWN_BUTTON_PushButton_PIN_D3,  INPUT_PULLUP);
    pinMode(ENTER_BUTTON_PushButton_PIN_D4, INPUT_PULLUP);

    // Initialize the LCD
    lcd.init();
    lcd.backlight();
    displayMenu();
}

void loop(void)
{
    // put your main code here, to run repeatedly:
    navigateMenu();
}

void displayMenu(void)
{
    lcd.clear();
    if (inSubMenu) {
        lcd.setCursor(0, 0);
        lcd.print(mainMenu[menuIndex]);
        lcd.setCursor(0, 1);
        if (menuIndex == 0) {
            lcd.print(subMenu1[subMenuIndex]);
        } else if (menuIndex == 1) {
            lcd.print(subMenu2[subMenuIndex]);
        } else if (menuIndex == 2) {
            lcd.print(subMenu3[subMenuIndex]);
        }
    } else {
        for (int i = 0; i < 3; i++) {
            lcd.setCursor(0, i);
            if (i == menuIndex) {
                lcd.print("> ");
            } else {
                lcd.print("  ");
            }
            lcd.print(mainMenu[i]);
        }
    }
}

void navigateMenu(void)
{
    if (digitalRead(UP_BUTTON_PushButton_PIN_D2) == LOW) {
        delay(200); // debounce delay
        if (inSubMenu) {
            subMenuIndex = (subMenuIndex - 1 + 2) % 2; // wrap around submenu
        } else {
            menuIndex = (menuIndex - 1 + 3) % 3; // wrap around main menu
        }
        displayMenu();
    }

    if (digitalRead(DOWN_BUTTON_PushButton_PIN_D3) == LOW) {
        delay(200); // debounce delay
        if (inSubMenu) {
            subMenuIndex = (subMenuIndex + 1) % 2; // wrap around submenu
        } else {
            menuIndex = (menuIndex + 1) % 3; // wrap around main menu
        }
        displayMenu();
    }

    if (digitalRead(ENTER_BUTTON_PushButton_PIN_D4) == LOW) {
        delay(200); // debounce delay
        if (inSubMenu) {
            inSubMenu = false;
        } else {
            inSubMenu = true;
            subMenuIndex = 0;
        }
        displayMenu();
    }
}

/* END CODE */