xref: /gem5/src/systemc/tests/systemc/tracing/wif_trace/pct1/tx.cpp

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  Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
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  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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/*****************************************************************************

  tx.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 driver.cc */
/* This is a SIO transmitter */

#include "tx.h"

void sio_tx::byte (char c)
{
  bool parity = false;
  int n;

  // Start bit
  tx.write(false);
  wait();

  // 8 data bits
  for (n=0; n<8; n++) {
    if (c & 0x1) parity=!parity;
    tx.write (c & 0x1);
    c = c >>1;
    wait();
  }

  // parity bit
  tx.write(parity);
  wait();

  // stop bits;
  if (two_stop_bits) {
    tx.write(true);
    wait();
    tx.write(true);
    wait();
  } else {
    tx.write(true);
    wait();
  }
} // end of entry function


void sio_tx::mark (int cycles)
{
  int n;

  for (n=0; n<cycles; n++) {
    tx.write(true);
    wait();
  }
}


void sio_tx::entry()
{
  while (1) {
    mark(5);
    byte((char)0x5a);
    byte((char)0xff);
    mark(1);
    byte((char)0xab);
  }
} // end of entry function