Jump to content

Warning: (W571) no activity or clock movement for sc_start()


Recommended Posts

I'm trying to create vcd file for data gate and I got on this :

 

Info: (I703) tracing timescale unit set: 1 ns (trace.vcd)

Warning: (W571) no activity or clock movement for sc_start() invocation
In file: ../../../src/sysc/kernel/sc_simcontext.cpp:1742

 

my cod:

//andh.h file

#include <systemc.h>
SC_MODULE(andh){
    sc_in<bool> a;
    sc_in<bool> b;
    sc_out<bool> o;
    void and_process(){
        o.write(a.read()&&b.read());

    }
    SC_CTOR(andh){
        SC_METHOD(and_process);
        sensitive<<a<<b;

    }

};
////////////////////////////////////////////////////////////////////////////////////

andh.cpp file

#include<systemc.h>
#include"andh.h"
#define SC_MAKE_VERSION( x, y, z ) \
  (((x)*10000) + ((y)*100) + (z))


int sc_main(int argc, char*argv[]) {
    andh and1("and1");

    sc_signal<bool> A,B,O;

    and1.a(A);
    and1.b(B);
    and1.o(O);

    sc_start(SC_ZERO_TIME);

    sc_trace_file *tf=sc_create_vcd_trace_file("trace");

    tf->set_time_unit(1,SC_NS);

    sc_trace(tf,A,"A");
    sc_trace(tf,B,"B");
    sc_trace(tf,O,"O");

    A=0;B=0;

    sc_start(10,SC_MS);

    for(int i=0;i<10;i++){

        A=((i& 0x1)!=0);
        B=((i& 0x2)!=0);
        sc_start(10,SC_NS);
    }

    sc_close_vcd_trace_file(tf);
    sc_start();
    return 0;

}
///////////////////////////////////////////////////////////////////////////////////////////////

this is Warning message

‏‏لقطة الشاشة (4).png

Link to post
Share on other sites

Hello @omaima,

You probably want to replace the following lines:

31 minutes ago, omaima said:

sc_close_vcd_trace_file(tf);
    sc_start();

with:

sc_stop();
sc_close_vcd_trace_file(tf);

Also, I would recommend that you go through the examples folder in the SystemC sources to try and understand various modelling techniques.

Hope this helps.

Regards,

Ameya Vikram Singh

Link to post
Share on other sites

You also need to change the order of sc_start and trace file creation:

    sc_trace_file *tf=sc_create_vcd_trace_file("trace");

    tf->set_time_unit(1,SC_NS);

    sc_trace(tf,A,"A");
    sc_trace(tf,B,"B");
    sc_trace(tf,O,"O"); 

    sc_start(SC_ZERO_TIME);

Afaik the kernel will not add traces once the simulation passed end of elaboration (which happens with the very first call of sc_start())

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...