testbench.cpp revision 12855:588919e0e4aa 
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10    http://www.apache.org/licenses/LICENSE-2.0
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20/*****************************************************************************
21
22  testbench.cpp --
23
24  Original Author: Martin Janssen, Synopsys, Inc., 2002-02-15
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/* Filename testbench.cc */
39/* This is the implementation file for synchronous process `testbench' */
40
41#include "testbench.h"
42
43float gen_sample(float t);
44
45extern float signal_freq;
46
47void testbench::entry()
48{
49  float sample_val;
50  float result_val;
51  float time;
52
53  FILE *data1 = fopen("Sample", "w");
54  FILE *data2 = fopen("Result", "w");
55
56  reset.write(true);
57  wait(5);
58  reset.write(false);
59  wait();
60
61  time = 0.0;
62  while (true) {
63    sample_val = gen_sample(time);
64    sample.write(sample_val);
65    wait();
66    result_val = result.read();
67    fprintf(data1, "%f\t%f\n", time, sample_val);
68    fprintf(data2, "%f\t%f\n", time, result_val);
69    char buf[BUFSIZ];
70    sprintf( buf, "Input = %f\tOutput = %f", sample_val, result_val );
71    cout << buf << endl;
72    time += 1.0;
73  }
74} // end of entry function
75
76
77float
78gen_step(float t)
79{
80  if (t < 10.0)
81    return (0.0);
82  else
83    return (1.0);
84}
85
86float
87gen_impulse(float t)
88{
89  if (t == 20.00)
90    return (1.00);
91  else
92    return (0.00);
93}
94
95float
96gen_sine(float t, float freq) // freq in Hertz
97{
98  return sin(6.283185 * freq * t * CLOCK_PERIOD * 1e-9);
99}
100
101// This function actually generates the samples
102float
103gen_sample(float t)
104{
105 // return (gen_step(t));
106  //  return (gen_impulse(t));
107   return (gen_sine(t, signal_freq));
108}
109