xref: /gem5/src/systemc/tests/systemc/misc/stars/star113623/test.cpp

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  test.cpp --

  Original Author: Martin Janssen, Synopsys, Inc., 2002-02-15

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/*
I have closed the star. The testcase I'm attaching shows that Cthreads
used to sample the inputs at the beginnig and therefor it took 2
cycles to see the results back in sc_main. Hope you could take the
action to include it in the regression systemc, since I don't know
what system you guys are using.

Thanks,
Rocco
*/

#include "systemc.h"

SC_MODULE(adder_reg) {
   sc_in<sc_int<8> > a;
   sc_in<sc_int<8> > b;
   sc_out<sc_int<9> > c;
   //sc_in<bool> clk;
   sc_in_clk clk;

void add() {
  // c.write(a.read() + b.read()); // *** THIS WON'T COMPILE ***
   c = a.read() + b.read(); // Must use read() method
  }

SC_CTOR(adder_reg) {
   SC_CTHREAD(add, clk.pos());
  }
};

int sc_main(int argc, char *argv[])
{
  sc_signal< sc_int<8> > a;
  sc_signal< sc_int<8> > b;
  sc_signal< sc_int<9> > c;
  sc_clock clk("CLK", 10, SC_NS, 0.5, 0.0, SC_NS);
  adder_reg adder_reg("adder");
  adder_reg(a, b, c, clk);
  a = 3;
  b = 6;
  cout << c.read().to_int() << endl;
  sc_start(10, SC_NS);
  cout << c.read().to_int() << endl;
  sc_start(10, SC_NS);

  // CynAppsTwo clocks to get the answer.
  // Rocco: No with SC_METHOD it take 1 cycle
  cout << c.read().to_int() << endl;
  return 0;
}