src/systemc/tests/systemc/misc/v1.0/dash3/pulse.cpp

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/*****************************************************************************
 
  pulse.cpp -- Implementation of the pulse generator.
 
  Original Author: Ali Dasdan, Synopsys, Inc.
 
 *****************************************************************************/

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

  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
  changes you are making here.

      Name, Affiliation, Date:
  Description of Modification:

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

// $Log: pulse.cpp,v $
// Revision 1.1.1.1  2006/12/15 20:26:24  acg
// systemc_tests-2.3
//
// Revision 1.3  2006/01/19 00:48:19  acg
// Andy Goodrich: Changes for the fact signal write checking is enabled.
//
// Revision 1.2  2006/01/18 00:23:50  acg
// Change over from SC_NO_WRITE_CHECK to sc_write_check_enable() call.
//

#define SC_NO_WRITE_CHECK
#include "systemc.h"
#include "const.h"
#include "pulse.h"

// Find the pulse period to produce speed.
// This function also rounds the period to the nearest integer.
int
gen_pulse_mod::find_period(int speed)
{
  if (speed <= 0)
    return 1;

  const double num = DIST_BETWEEN_TWO_PULSES * PERIODS_PER_HOUR / 2;

  double dp = num / speed;
  int    ip = int(dp);

  ip = ip + ((dp - ip) >= double(0.5) ? 1 : 0);

  return ip;
}

// Generate pulses for speedometer and odometers.
void
gen_pulse_mod::gen_pulse_proc()
{
  wait();

  speed_pulse = false;
  dist_pulse = false;

  // Wait until the car is started.
  do {
    wait();
  } while (start.read() == false);

  while (true) {

    speed_pulse = true;
    dist_pulse = true;
    AWAIT(find_period(speed));

    speed_pulse = false;
    dist_pulse = false;
    AWAIT(find_period(speed));
  }
}

// End of file