Catan Menu

#include <LiquidCrystal.h>
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
int keypad_pin = A0;
int keypad_value = 0;
int keypad_value_old = 0;
char btn_push;
byte mainMenuPage = 1;
byte mainMenuPageOld = 1;
byte mainMenuTotal = 4;
void setup() {
lcd.begin(16, 2); //Initialize a 2x16 type LCD
MainMenuDisplay();
delay(1000);
}
void loop() {
btn_push = ReadKeypad();
MainMenuBtn();
if (btn_push == 'S') { //enter selected menu
WaitBtnRelease();
switch (mainMenuPage) {
case 1:
Catan;
break;
case 2:
Rivals_Of_Catan();
break;
case 3:
MenuC();
break;
case 4:
MenuD();
break;
}
MainMenuDisplay();
WaitBtnRelease();
}
delay(10);
}//--------------- End of loop() loop ---------------------
void Catan() {

}

void Rivals_Of_Catan() {


}
void MenuC()
{
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("Inside Menu C");
while (ReadKeypad() != 'L')
{
//Insert Task for Menu C here
}
}
void MenuD()
{
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("Inside Menu D");
while (ReadKeypad() != 'L')
{
//Insert Task for Menu D here
}
}
void MainMenuDisplay()
{
lcd.clear();
lcd.setCursor(0, 0);
switch (mainMenuPage)
{
case 1:
lcd.print("Catan");
break;
case 2:
lcd.print("Rivals_Of_Catan");
break;
case 3:
lcd.print("3. Menu C");
break;
case 4:
lcd.print("4. Menu D");
break;
}
}
void MainMenuBtn()
{
WaitBtnRelease();
if (btn_push == 'U')
{
mainMenuPage++;
if (mainMenuPage > mainMenuTotal)
mainMenuPage = 1;
}
else if (btn_push == 'D')
{
mainMenuPage--;
if (mainMenuPage == 0)
mainMenuPage = mainMenuTotal;
}
if (mainMenuPage != mainMenuPageOld) //only update display when page change
{
MainMenuDisplay();
mainMenuPageOld = mainMenuPage;
}
}
char ReadKeypad()
{
/* Keypad button analog Value
no button pressed 1023
select 741
left 503
down 326
up 142
right 0
*/
keypad_value = analogRead(keypad_pin);
if (keypad_value < 100)
return 'R';
else if (keypad_value < 200)
return 'U';
else if (keypad_value < 400)
return 'D';
else if (keypad_value < 600)
return 'L';
else if (keypad_value < 800)
return 'S';
else
return 'N';
}
void WaitBtnRelease()
{
while ( analogRead(keypad_pin) < 800)
}