sc_port binding problem

[jcmel]

Hi everybody,

I would like to implement a communication between a process (P1) and another process P2 inside an instance (m2) through a fifo of schedule.

At compilation it looks well but at run time i am facing a problem of binding failed (port p0 not bound).

I don't understand the error (E109)  because in constructor of m1, I did the binding m2->p0(c0).

Thanks for your help.

regards

Jean-Claude

[apfitch]

Could you post your code?

regards

Alan

[jcmel]

Hi,

Here is a part of the code.

Regards,

Jean-Claude

 

 

class M2 : public sc_module
{
public:  
    // Constructor
    M2(sc_module_name name);
    // Destructor
    ~M2();

    sc_port<sc_fifo_in_if< Schedule> > p0;
    
private:

    void    threadReceiveSchedule();
    ....    

};

SC_HAS_PROCESS(M2);
M2::M2(sc_module_name name)
{
    SC_THREAD(threadReceiveSchedule);
}

void M2::threadReceiveSchedule()
{
    Schedule schedule;
    while(true)
    {
        if (p0->nb_read(schedule))
        {
            // DO something
        }
        wait(10, SC_NS);
    }
}

//////////////////////////////////////////

 

class M1 : public sc_module
{
public:  
    // Constructor
    M1(sc_module_name name);
    // Destructor
    ~M1();

    sc_fifo<schedule > > c0;
    
private:

    M2*    _m2;
    ....   
};

 

SC_HAS_PROCESS(M1);
M1::M1(sc_module_name name):

c0("fifo_schedule", 10)
{
    _m2 = new M2("M2");

// binding
    _m2->p0(c0);
}

void M1::process()
{
    ....
    c0.write(schedule);
}

 

[ralph.goergen]

Hi Jean-Claude,

 

I am not sure if this couses the port not bound error but I see at least one issue in your code:

SC_HAS_PROCESS macro shall beinvoked within the class definition or the constructor body. I looks like you are calling it in a global area between class definition and ctor body or in a cpp file right before the ctor body.

Please try to move the macro call into the module/class definition.

 

Greetings

Ralph

[jcmel]

Hi Ralph,

For the definition of SC_HAS_PROCESS macro, I followed the recommended style defined in SystemC: From the Ground up illustrated in figure 4.20: Recommended style NAME.cpp page 57.

 

I believe I dont' have the permission to provide a pdf of this page. I'am right.

Regards,

Jean-Claude

 

[ralph.goergen]

OK. It seems to work as well when you place the constructor in a cpp file. I did not use it that way so far. Actually, the standard says something differrent:

IEEE1666-2011: Sec 5.2.8: "Macro SC_HAS_PROCESS shall only be used within the class definition, constructor body, or member function body of a module. The name of the module class being constructed shall be passed as the argument to the macro. The macro invocation shall be terminated with a semicolon."

Rest of your example seems to be OK and the code below works in my environment (slight modification of your code replacing Schedule with int and fixed typos):

//m2.h
#include <systemc>
using namespace sc_core;
class M2 : public sc_module
{
public:  
    // Constructor
    M2(sc_module_name name);
    sc_port<sc_fifo_in_if< int > > p0;
private:
    void    threadReceiveSchedule();
};

//m2.cpp
#include "m2.h"

SC_HAS_PROCESS(M2);
M2::M2(sc_module_name name)
{
    SC_THREAD(threadReceiveSchedule);
}

void M2::threadReceiveSchedule()
{
    int schedule;
    while(true)
    {
		std::cout << "read fifo" << std::endl;
        if (p0->nb_read(schedule))
        {
        }
        wait(10, SC_NS);
    }
}
  
//m1.h
#include <systemc>
#include "m2.h"

class M1 : public sc_module
{
public:  
    // Constructor
    M1(sc_module_name name);
    sc_fifo< int > c0;
	void process();
private:
    M2*    _m2;
};

//m1.cpp
#include "m1.h"

SC_HAS_PROCESS(M1);
M1::M1(sc_module_name name):
c0("fifo_schedule", 10)
{
    _m2 = new M2("M2");
    _m2->p0(c0);
}

void M1::process()
{
	int schedule;
    c0.write(schedule);
} 

//main.cpp
#include "m1.h"
using namespace sc_core;

int sc_main(int,char**)
{
	M1 _m1("m1");
	sc_core::sc_start(sc_core::SC_ZERO_TIME);
	return 0;
}