1 files changed, 97 insertions, 0 deletions
diff --git a/src/fsk_get_test_bits.c b/src/fsk_get_test_bits.c
new file mode 100644
index 0000000..937ccf0
--- /dev/null
+++ b/src/fsk_get_test_bits.c
@@ -0,0 +1,97 @@
+/*---------------------------------------------------------------------------*\
+
+  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;
+}