gem5  v22.0.0.2
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  *****************************************************************************/
19 
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.
32 
33  Name, Affiliation, Date:
34  Description of Modification:
35 
36  *****************************************************************************/
37 
38 #ifndef SPEED_H
39 #define SPEED_H
40 
41 SC_MODULE( speed_read_mod )
42 {
43  // Input ports:
44  sc_in<bool> start; // Becomes true if the car's started.
45  sc_in<bool> pulse; // Pulse coming from the pulse generator.
46 
47  // Output ports:
48  sc_out<double> filtered_speed; // Filtered speed.
49 
50  // Inout ports:
51  sc_inout<int> elapsed_time;
52 
53  // Internal signals:
54  sc_signal<double> raw_speed;
55 
56  // Compute speed.
57  void read_speed_proc();
58 
59  // Filter speed.
60  void filter_speed_proc();
61 
62  SC_CTOR( speed_read_mod )
63  {
64  SC_THREAD( read_speed_proc );
65  sensitive << pulse.pos();
66 
67  SC_METHOD( filter_speed_proc );
68  sensitive << raw_speed;
69 
70  raw_speed = 0.0;
71  }
72 };
73 
74 SC_MODULE( speed_pwm_mod )
75 {
76  // Input ports:
77  sc_in<bool> start; // Becomes true if the car's started.
78  sc_in<double> filtered_speed;
79 
80  // Output ports:
81  sc_out<double> speed; // Displayed speed.
82  sc_out<double> angle; // Displayed angle.
83 
84  // Compute needle angle and drive the speedometer.
85  void pwm_driver_proc();
86 
87  SC_CTOR( speed_pwm_mod )
88  {
89  SC_METHOD( pwm_driver_proc );
90  sensitive << filtered_speed;
91  }
92 };
93 
94 SC_MODULE( speed_mod )
95 {
96  // Input ports:
97  sc_in_clk clk; // Clock to measure the time, needed to compute the speed.
98  sc_in<bool> start; // Becomes true if the car's started.
99  sc_in<bool> pulse; // Pulse coming from the pulse generator.
100 
101  // Output ports:
102  sc_out<double> speed; // Displayed speed.
103  sc_out<double> angle; // Displayed angle.
104 
105  // Internal signals:
106  sc_signal<int> elapsed_time;
107  sc_signal<double> filtered_speed;
108 
109  // Internal models:
110  speed_read_mod *read_mod;
111  speed_pwm_mod *pwm_mod;
112 
113  // Find the elapsed_time between NUM_PULSES_FOR_SPEED pulses.
114  void find_time_proc();
115 
116  SC_CTOR( speed_mod )
117  {
118  SC_METHOD( find_time_proc );
119  sensitive << clk.pos();
120 
121  read_mod = new speed_read_mod("read_mod");
122  pwm_mod = new speed_pwm_mod("pwm_mod");
123 
124  read_mod->start.bind(start);
125  read_mod->pulse.bind(pulse);
126  read_mod->elapsed_time.bind(elapsed_time);
127  read_mod->filtered_speed.bind(filtered_speed);
128 
129  pwm_mod->start.bind(start);
130  pwm_mod->filtered_speed.bind(filtered_speed);
131  pwm_mod->speed.bind(speed);
132  pwm_mod->angle.bind(angle);
133 
134  elapsed_time = 0;
135  filtered_speed = 0.0;
136  }
137 };
138 
139 #endif
140 
SC_THREAD
#define SC_THREAD(name)
Definition: sc_module.hh:313
SC_CTOR
#define SC_CTOR(name)
Definition: sc_module.hh:297
SC_MODULE
SC_MODULE(speed_mod)
Definition: speed.h:41
SC_METHOD
#define SC_METHOD(name)
Definition: sc_module.hh:303
sc_core::sc_in_clk
sc_in< bool > sc_in_clk
Definition: sc_clock.hh:116

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