SystemC - Can I retrieve clock period from sc_in_clk port?

Question

Can I retrieve the clock period through sc_port?

The following code doesn't work. I'd like to call method period() defined in sc_clock.

sc_in_clk clk;

*clk.get_interface()->period();

Answer 1

You could use dynamic_cast<> to cast the sc_interface returned by get_interface() as an sc_clock:

#include <iostream>
#include <systemc>

using namespace std;
using namespace sc_core;

SC_MODULE(A) {
    sc_in_clk clk;

    SC_CTOR(A) {}

    void start_of_simulation() {
        sc_clock *channel = dynamic_cast<sc_clock *>(clk.get_interface());
        cout << name() << ": period is "
             << (channel ? channel->period() : SC_ZERO_TIME) << endl;
    }
};

int sc_main(int argc, char *argv[]) {
    A a1("a1");
    A a2("a2");

    sc_clock clk("clk", 3.0, SC_NS);
    sc_signal<bool> fake_clk("fake_clk");

    a1.clk(clk);
    a2.clk(fake_clk);

    sc_start(10, SC_NS);

    return EXIT_SUCCESS;
}

This works because sc_clock is a subclass of sc_interface.

If dynamic_cast<> succeeds, then a valid sc_clock pointer is returned. If it fails, NULL is returned.