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

//

// Filename:    testb.h

//

// Project:     Zip CPU -- a small, lightweight, RISC CPU core

//

// Purpose:     A wrapper for a common interface to a clocked FPGA core

//              begin exercised in Verilator.

//

// Creator:     Dan Gisselquist, Ph.D.

//              Gisselquist Technology, LLC

//

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

//

// Copyright (C) 2015,2017, Gisselquist Technology, LLC

//

// This program is free software (firmware): you can redistribute it and/or

// modify it under the terms of  the GNU General Public License as published

// by the Free Software Foundation, either version 3 of the License, or (at

// your option) any later version.

//

// This program is distributed in the hope that it will be useful, but WITHOUT

// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with this program.  (It's in the $(ROOT)/doc directory.  Run make with no

// target there if the PDF file isn't present.)  If not, see

// <http://www.gnu.org/licenses/> for a copy.

//

// License:     GPL, v3, as defined and found on www.gnu.org,

//              http://www.gnu.org/licenses/gpl.html

//

//

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

#ifndef TESTB_H

#define TESTB_H

#include <stdio.h>

#include <stdint.h>

#include <verilated_vcd_c.h>

template <class VA>     class TESTB {

public:

        VA      *m_core;

        VerilatedVcdC*  m_trace;

        unsigned long   m_tickcount;

        TESTB(void) : m_trace(NULL), m_tickcount(0l) {

                m_core = new VA;

                Verilated::traceEverOn(true);

                m_core->i_clk = 0;

                eval(); // Get our initial values set properly.

        }

        virtual ~TESTB(void) {

                if (m_trace) m_trace->close();

                delete m_core;

                m_core = NULL;

        }

        virtual void    opentrace(const char *vcdname) {

                if (!m_trace) {

                        m_trace = new VerilatedVcdC;

                        m_core->trace(m_trace, 99);

                        m_trace->open(vcdname);

                }

        }

        virtual void    closetrace(void) {

                if (m_trace) {

                        m_trace->close();

                        m_trace = NULL;

                }

        }

        virtual void    eval(void) {

                m_core->eval();

        }

        virtual void    tick(void) {

                m_tickcount++;

                // Make sure we have our evaluations straight before the top

                // of the clock.  This is necessary since some of the 

                // connection modules may have made changes, for which some

                // logic depends.  This forces that logic to be recalculated

                // before the top of the clock.

                eval();

                if (m_trace) m_trace->dump(10*m_tickcount-2);

                m_core->i_clk = 1;

                eval();

                if (m_trace) m_trace->dump(10*m_tickcount);

                m_core->i_clk = 0;

                eval();

                if (m_trace) m_trace->dump(10*m_tickcount+5);

        }

        virtual void    reset(void) {

                m_core->i_rst = 1;

                tick();

                m_core->i_rst = 0;

                // printf("RESET\n");

        }

};

#endif