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/* GECKO3COM

 *

 * Copyright (C) 2010 by

 *   ___    ____  _   _

 *  (  _`\ (  __)( ) ( )

 *  | (_) )| (_  | |_| |   Bern University of Applied Sciences

 *  |  _ <'|  _) |  _  |   School of Engineering and

 *  | (_) )| |   | | | |   Information Technology

 *  (____/'(_)   (_) (_)

 *

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

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

/** \file     GECKO3COM_simple_prng_tb.c

 *********************************************************************

 * \brief     simple programm to fill a file with a desired length value

 *

 *  to change the length of the value simply change the type of the value

 *  variable.

 *

 *  compile with:

 *  "gcc -o GECKO3COM_simple_prng_tb GECKO3COM_simple_prng_tb.c"

 *

 * \author    Christoph Zimmermann bfh.ch

 * \date      26. February 2010

 *

 */

#include <stdio.h>

#include <stdint.h>

#include <stdbool.h>

#include <math.h>

int main (void)

{

  /*--------------------------------------------------------------------------*/

  /* start of user configuration values */

  /* variable type of the desired value */

  uint32_t prng_data = 0x55555555;

  /* desired filename */

  const char* FILENAME = "GECKO3COM_simple_prng_tb.hex";

  /* how many times should the datablock repeated in the file */

  int16_t loop = 4096;

  /* end of configuration values */

  /*--------------------------------------------------------------------------*/

  FILE *output;

  uint64_t i,j;

  uint32_t prng_feedback;

  printf("Hello, this programm will write values with a bit length of %d to the file %s\n", sizeof(prng_data)*8, FILENAME);

  output = fopen(FILENAME, "w+b");

  /* create the desired number of data blocks */

  for(j=0; j<loop;j++) {

    if(!fwrite(&prng_data, sizeof(prng_data), 1, output)) {

      printf("ERROR writing to the file\n");

      return 0;

    }

    prng_feedback = prng_data >> 10;

    prng_feedback ^= prng_data >> 12;

    prng_feedback ^= prng_data >> 13;

    prng_feedback ^= prng_data >> 15;

    prng_feedback &= 0x00000001;

    prng_data = prng_data << 1;

    prng_data |= prng_feedback;

  }

  fclose(output);

  return 1;

}