gem5  v20.1.0.0
speed.h
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3  Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
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6  Accellera licenses this file to you under the Apache License, Version 2.0
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18  *****************************************************************************/
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20 /*****************************************************************************
21 
22  speed.h -- Definition of the speedometer.
23 
24  Original Author: Ali Dasdan, Synopsys, Inc.
25 
26  *****************************************************************************/
27 
28 /*****************************************************************************
29 
30  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
31  changes you are making here.
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33  Name, Affiliation, Date:
34  Description of Modification:
35 
36  *****************************************************************************/
37 
38 #ifndef SPEED_H
39 #define SPEED_H
40 
41 SC_MODULE( speed_mod )
42 {
43  // Input ports:
44  sc_in_clk clk; // Clock to measure the time, needed to compute the speed.
45  sc_in<bool> start; // Becomes true if the car's started.
46  sc_in<bool> pulse; // Pulse coming from the pulse generator.
47 
48  // Output ports:
49  sc_out<double> speed; // Displayed speed.
50  sc_out<double> angle; // Displayed angle.
51 
52  // Internal signals:
53  sc_signal<int> elapsed_time;
54  sc_signal<double> raw_speed;
55  sc_signal<double> filtered_speed;
56 
57  // Find the elapsed_time between NUM_PULSES_FOR_SPEED pulses.
58  void find_time_proc();
59 
60  // Compute speed.
61  void read_speed_proc();
62 
63  // Filter speed.
64  void filter_speed_proc();
65 
66  // Compute needle angle and drive the speedometer.
67  void pwm_driver_proc();
68 
69  SC_CTOR( speed_mod )
70  {
71  SC_METHOD( find_time_proc );
72  sensitive << clk.pos();
73 
74  SC_THREAD( read_speed_proc );
75  sensitive << pulse.pos();
76 
77  SC_METHOD( filter_speed_proc );
78  sensitive << raw_speed;
79 
80  SC_METHOD( pwm_driver_proc );
81  sensitive << filtered_speed;
82 
83  elapsed_time = 0;
84  raw_speed = 0.0;
85  filtered_speed = 0.0;
86  }
87 
88 };
89 
90 #endif
91 
SC_THREAD
#define SC_THREAD(name)
Definition: sc_module.hh:309
SC_CTOR
#define SC_CTOR(name)
Definition: sc_module.hh:293
SC_MODULE
SC_MODULE(speed_mod)
Definition: speed.h:41
SC_METHOD
#define SC_METHOD(name)
Definition: sc_module.hh:299
sc_core::sc_in_clk
sc_in< bool > sc_in_clk
Definition: sc_clock.hh:116

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