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/*---------------------------------------------------------------------------*\
FILE........: fsk_get_test_bits.c
AUTHOR......: Brady O'Brien
DATE CREATED: January 2016
Generates a pseudorandom sequence of bits for testing of fsk_mod and fsk_demod
\*---------------------------------------------------------------------------*/
/*
Copyright (C) 2016 David Rowe
All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License version 2.1, as
published by the Free Software Foundation. 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 Lesser General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "fsk.h"
#define TEST_FRAME_SIZE 100 /* arbitrary choice, repeats after this
many bits, sets frame size for rx
processing */
int main(int argc,char *argv[]){
int bitcnt, framecnt;
int framesize = TEST_FRAME_SIZE;
int i;
FILE *fout;
uint8_t *bitbuf;
if(argc < 3){
fprintf(stderr,"usage: %s OutputBitsOnePerByte numBits [framesize]\n",argv[0]);
exit(1);
}
if (argc == 4){
framesize = atoi(argv[3]);
fprintf(stderr, "Using custom frame size of %d bits\n", framesize);
}
/* Extract parameters */
bitcnt = atoi(argv[2]);
framecnt = bitcnt/framesize;
if (framecnt == 0) {
fprintf(stderr,"Need a minimum of %d bits\n", framesize);
exit(1);
}
if(strcmp(argv[1],"-")==0){
fout = stdout;
}else{
fout = fopen(argv[1],"w");
}
if(fout==NULL){
fprintf(stderr,"Couldn't open output file: %s\n", argv[1]);
exit(1);
}
/* allocate buffers for processing */
bitbuf = (uint8_t*)malloc(sizeof(uint8_t)*framesize);
/* Generate buffer of test frame bits from known seed */
srand(158324);
for(i=0; i<framesize; i++){
bitbuf[i] = rand()&0x1;
}
/* Output test frames */
srand(158324);
for(i=0; i<framecnt; i++){
fwrite(bitbuf,sizeof(uint8_t),framesize,fout);
if(fout == stdout){
fflush(fout);
}
}
free(bitbuf);
fclose(fout);
return 0;
}
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