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added RTLSDR bias tee support with -B #60

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added RTLSDR bias tee support with -B #60

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8 changes: 6 additions & 2 deletions main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -50,6 +50,7 @@ FILE *logfd;
#ifdef WITH_RTL
int gain = 450;
int ppm = 0;
int bias = 0;
#endif
#ifdef WITH_AIR
int gain = 18;
Expand All @@ -66,7 +67,7 @@ static void usage(void)
"vdlm2dec %s Copyright (c) 2016-2023 Thierry Leconte \n\n", VDLM2DEC_VERSION);
fprintf(stderr, "Usage: vdlm2dec [-J] [-q] [-j addr:port ] [-s addr:port ] [-l logfile] [-g gain]");
#ifdef WITH_RTL
fprintf(stderr, " [-p ppm] -r rtldevicenumber");
fprintf(stderr, " [-p ppm] [-B bias] -r rtldevicenumber");
#endif
#ifdef WITH_AIR
fprintf(stderr, " [-k airspy_serial_number]");
Expand All @@ -93,6 +94,7 @@ static void usage(void)
fprintf(stderr,
" -g gain :\t\tset rtl preamp gain in tenth of db (ie -g 90 for +9db).\n");
fprintf(stderr, " -p ppm :\t\tppm frequency correction\n");
fprintf(stderr, " -B bias :\t\tEnable (1) or Disable(0) bias tee\n");
#endif
#ifdef WITH_AIR
fprintf(stderr,
Expand Down Expand Up @@ -123,7 +125,7 @@ int main(int argc, char **argv)
nbch = 0;
logfd = stdout;

while ((c = getopt(argc, argv, "vqrp:g:k:l:JRj:s:i:GEUb:a")) != EOF) {
while ((c = getopt(argc, argv, "vqrp:g:k:l:JRj:s:i:GEUb:a:B:")) != EOF) {
switch (c) {
case 'v':
verbose = 2;
Expand All @@ -148,6 +150,8 @@ int main(int argc, char **argv)
case 'g':
gain = atoi(optarg);
break;
case 'B':
bias = atoi(optarg);
#endif
#ifdef WITH_AIR
case 'g':
Expand Down
8 changes: 8 additions & 0 deletions rtl.c
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Expand Up @@ -267,6 +267,14 @@ int initRtl(char **argv, int optind, thread_param_t * param)
return 1;
}

if(verbose>1)
fprintf(stderr,"Bias Tee set to %d\n",bias);
r = rtlsdr_set_bias_tee(dev, bias);
if (r < 0 ) {
fprintf(stderr, "WARNING: Failed to set bias tee\n");
return 1;
}

return 0;
}

Expand Down
1 change: 1 addition & 0 deletions vdlm2.h
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Expand Up @@ -86,6 +86,7 @@ extern pthread_barrier_t Bar1, Bar2;

#ifdef WITH_RTL
extern int ppm;
extern int bias;
extern complex float Cbuff[RTLINBUFSZ / 2];
#endif
#ifdef WITH_AIR
Expand Down