xref: /gem5/src/systemc/tests/systemc/misc/v1.0/dash1/speed.h

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  Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
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  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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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;

  // Find the elapsed_time between NUM_PULSES_FOR_SPEED pulses.
  void find_time_proc();

  // Compute speed.
  void read_speed_proc();

  SC_CTOR( speed_mod )
  {
    SC_METHOD( find_time_proc );
    sensitive << clk.pos();

    SC_THREAD( read_speed_proc );
    sensitive << pulse.pos();

    elapsed_time = 0;
  }

};

#endif