SOLVED Do I need pointers?

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1

Sixteen times per second I call my function Mastercontroller().

Within that function, I want to manage with the buttons LEFT, UP, DOWN and RIGHT a menu structure (I use intMenu, intMenu1, intMenu2 and intMen3 with the library Clickbutton.h ).
Question: How can I hold the values of the variables when I leave and return to the function Mastercontroller?

int intMenu=0, intMenu0=1, intMenu1=1, intMenu2=1, intMenu3=1; 
 
//=======================================================================================================
void setup()
{
	Serial.begin(9600);      // open the serial port at 9600 bps:
	lcd.begin();              // set the LCD address to 0x20 for a 16 chars and 2 line display
	
        //Prepare button functions
        for (int i=0; i<buttons; i++)
            {
            button[i].debounceTime   = 20;   // Debounce timer in ms
            button[i].multiclickTime = 250;  // Time limit for multi clicks
            button[i].longClickTime  = 1000; // Time until long clicks register
            }  

	//Initialize Timer1, preset to 16 Hz timetick
	cli();                    // disable global interrupts
	TCCR1A = 0;               // set entire TCCR1A register to 0
	TCCR1B = 0;               // same for TCCR1B
	OCR1A = 15624;            // set compare match register to desired timer count:
	TCCR1B |= (1 << WGM12);   // turn on CTC mode:
	TCCR1B |= (1 << CS10);    // Set CS10 and CS11 bits for 64 prescaler:
	TCCR1B |= (1 << CS11);
	TIMSK1 |= (1 << OCIE1A);  // enable timer compare interrupt:
	 
 
//=======================================================================================================
void loop(){
if (cnt1!=cnt1_previous){        //updates 16 times per second the mastercontroller; if not: the Mastercontroller is called too frequently
    cnt1_previous = cnt1;
    Mastercontroller();
  }  //End if

}  //End loop

//=======================================================================================================
//Mastercontrol function
void Mastercontroller() {

        //Update button control, request pushbutton position
        button[0].Update(); button[1].Update(); button[2].Update(); button[3].Update();
              
       //1. Check to switch to mainmenu (No setting or Logging active) =========================
       if (intMenu==0) {
              //Serial.println("Backtoets"); blnSetting=false;        
              //boolean blnUp, blnDown, blnRight;
              strLine1 = "SUNLOGGER v16";
              strLine2 = "1. Logging";
	      strLine3 = "2. Setting menu";
	      strLine4 = "";
	      lcd.setCursor(0,intMenu0 ); lcd.blink();
	      if (blnUpdateDisplay==true) {
		  Update_display();              
		  blnUpdateDisplay= false;       
	          }  //end if
	 
	      //if previous state changed, move cursor, update display
              if (button[1].clicks== 1 || button[2].clicks== 1) {
                  if (intMenu0==1) {intMenu0=2;} else {intMenu0=1;}
                  //strLine4= String(intMenu0);
		  lcd.setCursor(0,intMenu0-1);
          	  blnUpdateDisplay = true;   //Display wil be updated next turn
                  } //End if, button Up or Down pressed

	      //Switch to logging or settingmenu (pushbutton Right)
	      if (button[3].clicks==1 && intMenu0==1) {intMenu=10; Serial.println("Logging geactiveerd"); blnUpdateDisplay=true;  }
              if (button[3].clicks==1 && intMenu0==2) {intMenu=20; Serial.println("Setting geactiveerd"); blnUpdateDisplay=true;  }
              } //End 1.Mainmenu control (No setting or Logging)
          
       //2. Check to switch in Loggingmenu  ==========================
       //Toggle between first and last measurements in Loggingmenu
       if (intMenu==10){    
            //Action for logging
            }  //End 2.Logging menu
     

       //3. Check to switch in Settingmenu  ==========================
       //Toggle between first and last measurements in Loggingmenu
       if (intMenu==20){          
            if (button[0].clicks==1) {intMenu=0; blnUpdateDisplay=true; }    //Button Left:  back to mainmenu 
            if (button[1].clicks==1) {intMenu2++; blnUpdateDisplay=true; if (intMenu2>6){intMenu2=1;} }  
            if (button[2].clicks==1) {intMenu2--; blnUpdateDisplay=true; if (intMenu2<1){intMenu2=6;} }
            if (button[3].clicks==-1) {  
                            intMenu = 20 + intMenu2; 
                            //Do something
                            }     
           
            if (blnUpdateDisplay==true) {
                   Serial.print ("intMenu = "); Serial.println(intMenu); tab(); Serial.print("intMenu2 = "); Serial.println(intMenu2);
                   Update_display();               
		   blnUpdateDisplay= false;       
	           }  //end if
            } //End of setting menu control

Question.ino (4.37 KB)

2

Unless I misunderstood something, you can either make the variables globals, or you can make them static. If you only want to use them in the Mastercontroller(), make them static as that limits their scope to that function.

3

any variable declared outside of a function (e.g. setup(), loop(), etc. ), is a global variable.

http://arduino.cc/en/Reference/scope
http://arduino.cc/en/Tutorial/Variables

4

The previous response didn't take into account "Static Variables" This does and is I believe what you need to read.
http://arduino.cc/en/Reference/Static

Doc