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rtl_fm: fix auto/manual gain

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Signed-off-by: Steve Markgraf <steve@steve-m.de>
This commit is contained in:
Kyle Keen 2012-09-04 09:50:36 -04:00 committed by Steve Markgraf
parent c792c4aeac
commit f4a8a570c4
1 changed files with 18 additions and 9 deletions
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17
src/rtl_fm.c
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@ -60,6 +60,7 @@
#define MINIMAL_BUF_LENGTH 512
#define MAXIMAL_BUF_LENGTH (256 * 16384)
#define CONSEQ_SQUELCH 4
#define AUTO_GAIN -100
static pthread_t demod_thread;
static sem_t data_ready;
@ -103,7 +104,7 @@ void usage(void)
"\t (use multiple -f for scanning)\n"
"\t[-s samplerate (default: 24000 Hz)]\n"
"\t[-d device_index (default: 0)]\n"
"\t[-g tuner_gain (default: -1dB)]\n"
"\t[-g tuner_gain (default: automatic)]\n"
"\t[-l squelch_level (default: 150)]\n"
"\t[-E freq sets lower edge (default: center)]\n"
"\tfilename (a '-' dumps samples to stdout)\n\n"
@ -439,7 +440,7 @@ int main(int argc, char **argv)
char *filename = NULL;
int n_read;
int r, opt;
int i, gain = -10; // tenths of a dB
int i, gain = AUTO_GAIN; // tenths of a dB
uint8_t *buffer;
uint32_t dev_index = 0;
int device_count;
@ -538,11 +539,19 @@ int main(int argc, char **argv)
build_fir(&fm);
/* Set the tuner gain */
if (gain == AUTO_GAIN) {
r = rtlsdr_set_tuner_gain_mode(dev, 0);
} else {
r = rtlsdr_set_tuner_gain_mode(dev, 1);
r = rtlsdr_set_tuner_gain(dev, gain);
if (r < 0)
}
if (r != 0) {
fprintf(stderr, "WARNING: Failed to set tuner gain.\n");
else
} else if (gain == AUTO_GAIN) {
fprintf(stderr, "Tuner gain set to automatic.\n");
} else {
fprintf(stderr, "Tuner gain set to %0.2f dB.\n", gain/10.0);
}
if(strcmp(filename, "-") == 0) { /* Write samples to stdout */
fm.file = stdout;