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nussgipfel |
/* GECKO3COM
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*
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* Copyright (C) 2010 by
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* ___ ____ _ _
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* ( _`\ ( __)( ) ( )
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* | (_) )| (_ | |_| | Bern University of Applied Sciences
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* | _ <'| _) | _ | School of Engineering and
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* | (_) )| | | | | | Information Technology
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* (____/'(_) (_) (_)
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*
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*********************************************************************/
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/** \file GECKO3COM_simple_prng_tb.c
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*********************************************************************
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* \brief simple programm to fill a file with a desired length value
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*
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* to change the length of the value simply change the type of the value
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* variable.
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*
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* \author Christoph Zimmermann bfh.ch
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* \date 26. February 2010
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*
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <math.h>
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int main (void)
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{
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/*--------------------------------------------------------------------------*/
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/* start of user configuration values */
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/* variable type of the desired value */
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uint32_t prng_data = 0x55555555;
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/* desired filename */
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const char* FILENAME = "GECKO3COM_simple_prng_tb.hex";
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/* how many times should the datablock repeated in the file */
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int16_t loop = 4096;
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/* end of configuration values */
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/*--------------------------------------------------------------------------*/
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FILE *output;
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uint64_t i,j;
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uint32_t prng_feedback;
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printf("Hello, this programm will write values with a bit length of %d to the file %s\n", sizeof(prng_data)*8, FILENAME);
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output = fopen(FILENAME, "w+b");
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/* create the desired number of data blocks */
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for(j=0; j<loop;j++) {
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if(!fwrite(&prng_data, sizeof(prng_data), 1, output)) {
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printf("ERROR writing to the file\n");
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return 0;
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}
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prng_feedback = prng_data >> 10;
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prng_feedback ^= prng_data >> 12;
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prng_feedback ^= prng_data >> 13;
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prng_feedback ^= prng_data >> 15;
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prng_feedback &= 0x00000001;
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prng_data = prng_data << 1;
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prng_data |= prng_feedback;
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}
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fclose(output);
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return 1;
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}
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