xref: /gem5/src/systemc/tests/systemc/misc/sim_tests/biquad/biquad1/testbench.cpp

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/*****************************************************************************

  testbench.cpp --

  Original Author: Martin Janssen, Synopsys, Inc., 2002-02-15

 *****************************************************************************/

/*****************************************************************************

  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
  changes you are making here.

      Name, Affiliation, Date:
  Description of Modification:

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/* Filename testbench.cc */
/* This is the implementation file for synchronous process `testbench' */

#include "testbench.h"

float gen_sample(float t);

extern float signal_freq;

void testbench::entry()
{
  float sample_val;
  float result_val;
  float time;

  FILE *data1 = fopen("Sample", "w");
  FILE *data2 = fopen("Result", "w");

  reset.write(true);
  wait(5);
  reset.write(false);
  wait();

  time = 0.0;
  while (true) {
    sample_val = gen_sample(time);
    sample.write(sample_val);
    wait();
    result_val = result.read();
    fprintf(data1, "%f\t%f\n", time, sample_val);
    fprintf(data2, "%f\t%f\n", time, result_val);
    char buf[BUFSIZ];
    sprintf( buf, "Input = %f\tOutput = %f", sample_val, result_val );
    cout << buf << endl;
    time += 1.0;
  }
} // end of entry function


float
gen_step(float t)
{
  if (t < 10.0)
    return (0.0);
  else
    return (1.0);
}

float
gen_impulse(float t)
{
  if (t == 20.00)
    return (1.00);
  else
    return (0.00);
}

float
gen_sine(float t, float freq) // freq in Hertz
{
  return sin(6.283185 * freq * t * CLOCK_PERIOD * 1e-9);
}

// This function actually generates the samples
float
gen_sample(float t)
{
 // return (gen_step(t));
  //  return (gen_impulse(t));
   return (gen_sine(t, signal_freq));
}