speed.h

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/*****************************************************************************
 
  speed.h -- Definition of the speedometer.
 
  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:
 
 *****************************************************************************/
 
#ifndef SPEED_H
#define SPEED_H
 
SC_MODULE( speed_mod )
{
  // Input ports:
  sc_in_clk   clk; // Clock to measure the time, needed to compute the speed.
  sc_in<bool> start; // Becomes true if the car's started.
  sc_in<bool> pulse; // Pulse coming from the pulse generator.
 
  // Output ports:
  sc_out<double> speed; // Displayed speed.
  sc_out<double> angle; // Displayed angle.
 
  // Internal signals:
  sc_signal<int>    elapsed_time;
  sc_signal<double> raw_speed;
  sc_signal<double> filtered_speed;
 
  // Find the elapsed_time between NUM_PULSES_FOR_SPEED pulses.
  void find_time_proc();
 
  // Compute speed.
  void read_speed_proc();
 
  // Filter speed.
  void filter_speed_proc();
 
  // Compute needle angle and drive the speedometer.
  void pwm_driver_proc();
 
  SC_CTOR( speed_mod )
  {
    SC_METHOD( find_time_proc );
    sensitive << clk.pos();
 
    SC_THREAD( read_speed_proc );
    sensitive << pulse.pos();
 
    SC_METHOD( filter_speed_proc );
    sensitive << raw_speed;
 
    SC_METHOD( pwm_driver_proc );
    sensitive << filtered_speed;
 
    elapsed_time = 0;
    raw_speed = 0.0;
    filtered_speed = 0.0;
  }
 
};
 
#endif