speed.h revision 12855:588919e0e4aa 
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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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10    http://www.apache.org/licenses/LICENSE-2.0
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15  implied.  See the License for the specific language governing
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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
41SC_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
74SC_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
94SC_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
141