some question about generate the vcd file

[Rick Chen]

I'm new for SystemC, and here is my question:

 

I put this code in my main.cpp

 

sc_trace_file *tf = sc_create_vcd_trace_file("RESULT.vcd");

but it didn't generate the vcd file.

 

Here is the whole code:

 

// main.cpp
#include "systemc.h"
#include "timer.h"


int sc_main(int argc, char* argv[])


{
   // stimuli 
   sc_signal<bool> START, TIMEOUT;
   
   sc_time clkPrd(10, SC_NS);// period
   sc_clock CLOCK("clock", clkPrd); // timer
   // Binding
   timer tm("timer");
   tm.clock(CLOCK);
   tm.start(START);
   tm.timeout(TIMEOUT);

    // tracing
   
    sc_trace_file *tf = sc_create_vcd_trace_file("RESULT.vcd");
    tm.trace(tf);


    // 3 cycles delay ---> first time
    START.write(1);

    sc_start(3*clkPrd);

    // start counting ---> first time
    START.write(0);

    sc_start(3*clkPrd);

    // reset before count reaches 0; 3 cycles delay  ---> first time
    START.write(1);

    sc_start(3*clkPrd);

    // start counting again until count = 0
    START.write(0);

    sc_start(5*clkPrd);

    // reset after count = 0; 3 cycles delay
    START.write(1);

    sc_start(3*clkPrd);

    // start counting ---> second time
    START.write(0);

    sc_start(3*clkPrd);

    // reset before count reaches 0 ---> second time
    START.write(1);

    sc_start(1*clkPrd);

    // start counting again until count = 0 ---> second time
    START.write(0);

    sc_start(6*clkPrd);

    // reset after count = 0; 3 cycles delay  ---> second time
    START.write(1);

    sc_start(3*clkPrd);
    sc_close_vcd_trace_file(tf);

  return(0);
  }

// timer.cpp
#include "timer.h"

void timer::runtimer()
{
    while(1)
  {
        if (start.read())
    {
            cout << "Timer: timer start detected "<< endl;
            count = 5;
            timeout.write(0);
        }
    else
    {
            if (count == 0) timeout.write(1);
        else
          {
                count--;
                timeout.write(0);
              }
        }
        wait();
    }
}

//timer.h

#include <systemc.h>

SC_MODULE(timer)
{
    sc_in<bool> start;      // ports
    sc_out<bool> timeout;
    sc_in<bool> clock;

    int count;          // data and function members
    void runtimer();

    SC_CTOR(timer)
  {     // constructor
	SC_CTHREAD(runtimer, clock.pos());
	reset_signal_is(start, true);
    }
}; 

and this is my makefile:

 

SYSTEMC_DIR = /usr/local/systemc-2.3.3

PROJECT     = timer

BUILDFLAGS  = -g3

CXX         = g++



INCFLAGS    = -I. -I /usr/local/systemc-2.3.2/include

LDFLAGS     = -L /usr/local/systemc-2.3.2/lib-linux64 -lsystemc -lm

SRC_CPPHEAD = timer

SRC_CPP     =

HEADERS     =

MAIN        = main.cpp

OBJECTS     = $(SRC_CPPHEAD:=.o) $(SRC_CPP:cpp=o)



EXE = $(PROJECT)



all: $(EXE)



$(EXE): $(MAIN) $(OBJECTS) $(HEADERS)

	@echo "$@ building..."

	$(CXX) $(INCFLAGS) $(MAIN) $(OBJECTS) $(LDFLAGS) -o $@

	@echo ""

	@echo "$@ build done successfully..."

	@echo ""



%.o:%.cpp %.h

	@echo "Compiling $< ..."

	$(CXX) -c $< $(INCFLAGS)



clean:

	rm -f $(EXE)

	rm -f *.o

 

 

thanks a lot for helping me!!!

[David Black]

You need to call sc_trace for every individual signal or variable you wish to trace. If you have custom data types, then you need to overload sc_trace with your own type.