/*****************************************************************************

 

  The following code is derived, directly or indirectly, from the SystemC

  source code Copyright (c) 1996-2001 by all Contributors.

  All Rights reserved.

 

  The contents of this file are subject to the restrictions and limitations

  set forth in the SystemC Open Source License Version 2.2 (the "License");

  You may not use this file except in compliance with such restrictions and

  limitations. You may obtain instructions on how to receive a copy of the

  License at http://www.systemc.org/. Software distributed by Contributors

  under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF

  ANY KIND, either express or implied. See the License for the specific

  language governing rights and limitations under the License.

 

 *****************************************************************************/

 

/*****************************************************************************

 

  simple_fifo.cpp -- Simple SystemC 2.0 producer/consumer example.

 

                     From "An Introduction to System Level Modeling in

                     SystemC 2.0". By Stuart Swan, Cadence Design Systems.

                     Available at www.systemc.org

 

  Original Author: Stuart Swan, Cadence Design Systems, 2001-06-18

 

 *****************************************************************************/

 

/*****************************************************************************

 

  MODIFICATION LOG - modifiers, enter your name, affiliation, date and

  changes you are making here.

 

      Name, Affiliation, Date:

  Description of Modification:

 

 *****************************************************************************/

 

 

#include <systemc.h>

 

class write_if : virtual public sc_interface

{

   public:

     virtual void write(char) = 0;

     virtual void reset() = 0;

};

 

class read_if : virtual public sc_interface

{

   public:

     virtual void read(char &) = 0;

     virtual int num_available() = 0;

};

 

class fifo : public sc_channel, public write_if, public read_if

{

   public:

     fifo(sc_module_name name) : sc_channel(name), num_elements(0), first(0) {}

 

     void write(char c) {

       if (num_elements == max)

         wait(read_event);

 

       data[(first + num_elements) % max] = c;

       ++ num_elements;

       write_event.notify();

     }

 

     void read(char &c){

       if (num_elements == 0)

         wait(write_event);

 

       c = data[first];

       -- num_elements;

       first = (first + 1) % max;

       read_event.notify();

     }

 

     void reset() { num_elements = first = 0; }

 

     int num_available() { return num_elements;}

 

   private:

     enum e { max = 10 };

     char data[max];

     int num_elements, first;

     sc_event write_event, read_event;

};

 

class producer : public sc_module

{

   public:

     sc_port<write_if> out;

 

     SC_HAS_PROCESS(producer);

 

     producer(sc_module_name name) : sc_module(name)

     {

       SC_THREAD(main);

     }

 

     void main()

     {

       const char *str =

         "Visit www.systemc.org and see what SystemC can do for you today!\n";

 

       while (*str)

         out->write(*str++);

     }

};

 

class consumer : public sc_module

{

   public:

     sc_port<read_if> in;

 

     SC_HAS_PROCESS(consumer);

 

     consumer(sc_module_name name) : sc_module(name)

     {

       SC_THREAD(main);

     }

 

     void main()

     {

       char c;

       cout << endl << endl;

 

       while (true) {

         in->read(c);

         cout << c;

 

         if (in->num_available() == 1)

           cout << "<1>";

         if (in->num_available() == 9)

           cout << "<9>";

       }

     }

};

 

class top : public sc_module

{

   public:

     fifo *fifo_inst;

     producer *prod_inst;

     consumer *cons_inst;

 

     top(sc_module_name name) : sc_module(name)

     {

       fifo_inst = new fifo("Fifo1");

 

       prod_inst = new producer("Producer1");

       prod_inst->out(*fifo_inst);

 

       cons_inst = new consumer("Consumer1");

       cons_inst->in(*fifo_inst);

     }

};

 

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

   top top1("Top1");

   sc_start(-1);

   return 0;

}