speed.cpp revision 12855:588919e0e4aa 
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20/*****************************************************************************
21
22  speed.cpp -- 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// $Log: speed.cpp,v $
39// Revision 1.1.1.1  2006/12/15 20:26:24  acg
40// systemc_tests-2.3
41//
42// Revision 1.3  2006/01/19 00:48:14  acg
43// Andy Goodrich: Changes for the fact signal write checking is enabled.
44//
45// Revision 1.2  2006/01/18 00:23:50  acg
46// Change over from SC_NO_WRITE_CHECK to sc_write_check_enable() call.
47//
48
49#define SC_NO_WRITE_CHECK
50#include "systemc.h"
51#include "const.h"
52#include "speed.h"
53
54// Find the elapsed_time between NUM_PULSES_FOR_SPEED pulses.
55void speed_mod::find_time_proc()
56{
57  if (start)
58    elapsed_time = elapsed_time + 1;
59  else
60    elapsed_time = 0;
61}
62
63// Compute speed.
64void
65speed_mod::read_speed_proc()
66{
67  wait();
68
69  while (true) {
70
71    // More than one pulse is needed to compute a distance and
72    // consequently, speed. This function collects NUM_PULSES_FOR_SPEED
73    // pulses for that purpose.
74    AWAIT(NUM_PULSES_FOR_SPEED);
75
76    if (start)
77      raw_speed = DIST_BETWEEN_TWO_PULSES * PERIODS_PER_HOUR / elapsed_time;
78    else
79      raw_speed = 0.0;
80
81    // Reset timer.
82    elapsed_time = 0;
83  }
84}
85
86// Filter speed.
87void
88speed_mod::filter_speed_proc()
89{
90  if (start)
91    filtered_speed = raw_speed;
92  else
93    filtered_speed = 0.0;
94}
95
96// Compute needle angle and drive the speedometer.
97void
98speed_mod::pwm_driver_proc()
99{
100  if (start) {
101    speed = filtered_speed * 1.0;
102    angle = filtered_speed * MAX_ANGLE / MAX_SPEED;
103  }
104  else {
105    speed = 0.0;
106    angle = 0.0;
107  }
108}
109
110
111// End of file
112