class member function as an interrupt service routine

Projects Programming
7

Hello,

I still have problems attaching an Interrupt from within a Class. I guess I am doing some syntactic error or something wrong with the pointer. (Sorry I am a newbee to programming, Classes and OOP.)
I am getting the followig error:

In file included from NBS_Lib_V009.ino:33:0:
/tmp/build5142569924928438164.tmp/BS.h: In constructor 'BS::BS()':
/tmp/build5142569924928438164.tmp/BS.h:170:11: error: 'BS* BS::isr_handler' is a static data member; it can only be initialized at its definition
     BS(): isr_handler(this);//{}
           ^
/tmp/build5142569924928438164.tmp/BS.h:170:27: error: expected '{' at end of input
     BS(): isr_handler(this);//{}
                           ^
Fehler beim Kompilieren.

My Headder File: BS.h

class BS{

 private:
   static BS* isr_handler;
   //...and many more

 protected:
   void handle_isr(){ BS::RTCisr();}        // RTCisr() contains the Code for the ISR
   
 public:
   //BS();                                           // my old Construcktor
   BS(): isr_handler(this){}
   static void sisr2() { if(isr_handler) isr_handler->handle_isr(); }
   static void RTCisr(void);                      // psydo ISR called by real isr
   //...and many more

File BS.cpp:

   BS::BS(){                                         // BS Constructor
   //...and many more
    }   
    void BS::RTCisr(void){  //...    }       // psydo ISR called by real isr
    void BS::setupISR(void){
    attachInterrupt(4, isrRTC, RISING);
    }

in Main .ino File:

void isrRTC(){
  BS::sisr2();
}

Thank a lot in advance for any help and hints!! :slight_smile: