1 files changed, 0 insertions, 143 deletions
diff --git a/src/fsk_mod_ext_vco.c b/src/fsk_mod_ext_vco.c
deleted file mode 100644
index b4cfd6a..0000000
--- a/src/fsk_mod_ext_vco.c
+++ /dev/null
@@ -1,143 +0,0 @@
-/*---------------------------------------------------------------------------*\
-
-  FILE........: fsk_mod_ext_vco.c
-  AUTHOR......: David Rowe
-  DATE CREATED: Feb 2018
-
-  Converts a stream of bits to mFSK raw file of "levels" suitable for
-  driving an external VCO, e.g. legacy FM transmitter in data mode.
-   
-\*---------------------------------------------------------------------------*/
-
-/*
-  Copyright (C) 2018 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 <assert.h>
-#include <math.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdint.h>
-#include <string.h>
-
-#define OVERSAMPLE 100
-
-int main(int argc,char *argv[]){
-    int   os, m, log2m, i, bit_i, sym, legacy_mode, rpitx_mode;
-    float d;
-    double shiftHz, symbolRateHz;
-    uint32_t time_sample;
-    FILE *fin,*fout;
-    
-    if(argc<5){
-        fprintf(stderr, "usage: %s InputOneBitPerCharFile OutputVcoRawFile MbitsPerFSKsymbol\n",argv[0]);
-        fprintf(stderr, "[--legacy OutputSamplesPerSymbol deviationPerlevel]\n");
-        fprintf(stderr, "[--rpitx ShiftHz SymbolRateHz\n]");
-        exit(1);
-    }
-    
-    /* Extract parameters */
-    
-    if (strcmp(argv[1],"-")==0){
-        fin = stdin;
-    } else {
-        fin = fopen(argv[1],"r");
-    }
-	
-    if (strcmp(argv[2],"-")==0){
-        fout = stdout;
-    } else {
-        fout = fopen(argv[2],"w");
-    }
-    
-    m = atoi(argv[3]); log2m = log2(m);
-    printf("log2m: %d\n", log2m);
-
-    legacy_mode = rpitx_mode = os = 0;
-    if (!strcmp(argv[4],"--legacy")) {
-        os = atoi(argv[5]);
-        d = atof(argv[6]);
-        legacy_mode = 1;
-    }
-    if (!strcmp(argv[4],"--rpitx")) {
-        shiftHz = atof(argv[5]);
-        symbolRateHz = atof(argv[6]);
-        rpitx_mode = 1;
-        time_sample = 1E9/symbolRateHz;
-        fprintf(stderr, "time_sample: %d\n", time_sample);
-    }
-
-    assert(legacy_mode || rpitx_mode);
-    fprintf(stderr, "legacy_mode: %d rpitx_mode: %d\n", legacy_mode, rpitx_mode);
-    
-    uint8_t tx_bits[log2m];
-    int16_t rawbuf[os];
-
-    /* Modulate m bits to levels to drive external VCO */
-
-    while( fread(tx_bits, sizeof(uint8_t), log2m, fin) == log2m ){
-
-        /* generate the symbol number from the bit stream, 
-           e.g. 0,1 for 2FSK, 0,1,2,3 for 4FSK */
-
-        sym = bit_i = 0;
-        for( i=m; i>>=1; ){
-            //fprintf(stderr, "tx_bits[%d] = %d\n", i, tx_bits[bit_i]);
-            uint8_t bit = tx_bits[bit_i];
-            bit = (bit==1)?1:0;
-            sym = (sym<<1)|bit;
-            bit_i++;
-        }
-        //fprintf(stderr, "sym = %d\n", sym);
-
-        if (legacy_mode) {
-            /* map 'sym' to VCO drive signal symmetrically about 0,
-               separate tones by constant "d"  */
-            /* 2 FSK -d/2, +d/2                */
-            /* 4 FSK -3*d/2, -d/2, +d/2, 3*d/2 */
-
-            /* note: drive is inverted, a higher tone drives VCO voltage lower */
-
-            float symf = sym;
-            float level = d*(((float)m-1)*0.5 - symf);
-            assert(level <= 32767.0);
-            assert(level >= -32768.0);
-            short level_short = (short)level;
-            //fprintf(stderr, "level = %f level_short = %d\n\n", level, level_short);
-            for(i=0; i<os; i++) {
-                rawbuf[i] = level_short;
-            }
-            fwrite(rawbuf, sizeof(int16_t), os, fout);
-        }
-
-        if (rpitx_mode) {
-	    short frequencyHz;
-            frequencyHz = shiftHz*(sym+1);
-            fwrite(&frequencyHz, sizeof(short), 1, fout);
-        }
-
-        if(fout == stdout){
-            fflush(fout);
-        }
-    }
-    
-    fclose(fin);
-    fclose(fout);
-
-    exit(0);
-}
-
-