void modesInitRTLSDR(void) {
int j;
int device_count;
char vendor[256], product[256], serial[256];
device_count = rtlsdr_get_device_count();
if (!device_count) {
fprintf(stderr, "[dvbt][e]No supported RTLSDR devices found.\n");
exit(1);
}
fprintf(stderr, "[dvbt][i]Found %d device(s):\n", device_count);
for (j = 0; j < device_count; j++) {
rtlsdr_get_device_usb_strings(j, vendor, product, serial);
fprintf(stderr, "[dvbt][i]%d: %s, %s, SN: %s %s\n", j, vendor, product, serial,
(j == Modes.dev_index) ? "(currently selected)" : "");
}
if (rtlsdr_open(&Modes.dev, Modes.dev_index) < 0) {
fprintf(stderr, "[dvbt][e]Error opening the RTLSDR device: %s\n",
strerror(errno));
exit(1);
}
/* Set gain, frequency, sample rate, and reset the device. */
rtlsdr_set_tuner_gain_mode(Modes.dev,
(Modes.gain == MODES_AUTO_GAIN) ? 0 : 1);
if (Modes.gain != MODES_AUTO_GAIN) {
if (Modes.gain == MODES_MAX_GAIN) {
/* Find the maximum gain available. */
int numgains;
int gains[100];
numgains = rtlsdr_get_tuner_gains(Modes.dev, gains);
Modes.gain = gains[numgains-1];
fprintf(stderr, "[dvbt][i]Max available gain is: %.2f\n", Modes.gain/10.0);
}
rtlsdr_set_tuner_gain(Modes.dev, Modes.gain);
fprintf(stderr, "[dvbt][i]Setting gain to: %.2f\n", Modes.gain/10.0);
} else {
fprintf(stderr, "[dvbt][i]Using automatic gain control.\n");
}
if( Modes.ppm_error != 0) {
fprintf(stderr, "[dvbt][i]Setting ppm error to: %d\n", Modes.ppm_error);
}
rtlsdr_set_freq_correction(Modes.dev, Modes.ppm_error);
if (Modes.enable_agc) rtlsdr_set_agc_mode(Modes.dev, 1);
rtlsdr_set_center_freq(Modes.dev, Modes.freq);
rtlsdr_set_sample_rate(Modes.dev, MODES_DEFAULT_RATE);
rtlsdr_reset_buffer(Modes.dev);
fprintf(stderr, "[dvbt][i]Gain reported by device: %.2f\n",
rtlsdr_get_tuner_gain(Modes.dev)/10.0);
}
void dabStick::setExternalGain (int gain) {
static int oldGain = 0;
if (gain == oldGain)
return;
if ((gain < 0) || (gain >= gainsCount))
return;
oldGain = gain;
rtlsdr_set_tuner_gain (device, gains [gain]);
(void)rtlsdr_get_tuner_gain (device);
gainDisplay -> display (gain);
}
void regain(rtlsdr_dev_t *d, int gain)
{
int g;
g = rtlsdr_get_tuner_gain(dev);
if (g == gain) {
return;}
if (gain == AUTO_GAIN) {
/* switch to auto */
rtlsdr_set_tuner_gain_mode(dev, 0);
return;
}
if (g == AUTO_GAIN) {
/* switch to manual */
rtlsdr_set_tuner_gain_mode(dev, 1);
}
rtlsdr_set_tuner_gain(dev, gain);
}
//
// =============================== RTLSDR handling ==========================
//
int modesInitRTLSDR(void) {
int j;
int device_count, dev_index = 0;
char vendor[256], product[256], serial[256];
if (Modes.dev_name) {
if ( (dev_index = verbose_device_search(Modes.dev_name)) < 0 )
return -1;
}
device_count = rtlsdr_get_device_count();
if (!device_count) {
fprintf(stderr, "No supported RTLSDR devices found.\n");
return -1;
}
fprintf(stderr, "Found %d device(s):\n", device_count);
for (j = 0; j < device_count; j++) {
rtlsdr_get_device_usb_strings(j, vendor, product, serial);
fprintf(stderr, "%d: %s, %s, SN: %s %s\n", j, vendor, product, serial,
(j == dev_index) ? "(currently selected)" : "");
}
if (rtlsdr_open(&Modes.dev, dev_index) < 0) {
fprintf(stderr, "Error opening the RTLSDR device: %s\n",
strerror(errno));
return -1;
}
// Set gain, frequency, sample rate, and reset the device
rtlsdr_set_tuner_gain_mode(Modes.dev,
(Modes.gain == MODES_AUTO_GAIN) ? 0 : 1);
if (Modes.gain != MODES_AUTO_GAIN) {
int *gains;
int numgains;
numgains = rtlsdr_get_tuner_gains(Modes.dev, NULL);
if (numgains <= 0) {
fprintf(stderr, "Error getting tuner gains\n");
return -1;
}
gains = malloc(numgains * sizeof(int));
if (rtlsdr_get_tuner_gains(Modes.dev, gains) != numgains) {
fprintf(stderr, "Error getting tuner gains\n");
free(gains);
return -1;
}
if (Modes.gain == MODES_MAX_GAIN) {
int highest = -1;
int i;
for (i = 0; i < numgains; ++i) {
if (gains[i] > highest)
highest = gains[i];
}
Modes.gain = highest;
fprintf(stderr, "Max available gain is: %.2f dB\n", Modes.gain/10.0);
} else {
int closest = -1;
int i;
for (i = 0; i < numgains; ++i) {
if (closest == -1 || abs(gains[i] - Modes.gain) < abs(closest - Modes.gain))
closest = gains[i];
}
if (closest != Modes.gain) {
Modes.gain = closest;
fprintf(stderr, "Closest available gain: %.2f dB\n", Modes.gain/10.0);
}
}
free(gains);
fprintf(stderr, "Setting gain to: %.2f dB\n", Modes.gain/10.0);
if (rtlsdr_set_tuner_gain(Modes.dev, Modes.gain) < 0) {
fprintf(stderr, "Error setting tuner gains\n");
return -1;
}
} else {
fprintf(stderr, "Using automatic gain control.\n");
}
rtlsdr_set_freq_correction(Modes.dev, Modes.ppm_error);
if (Modes.enable_agc) rtlsdr_set_agc_mode(Modes.dev, 1);
rtlsdr_set_center_freq(Modes.dev, Modes.freq);
rtlsdr_set_sample_rate(Modes.dev, (unsigned)Modes.sample_rate);
rtlsdr_reset_buffer(Modes.dev);
fprintf(stderr, "Gain reported by device: %.2f dB\n",
rtlsdr_get_tuner_gain(Modes.dev)/10.0);
return 0;
}
int main(int argc, char* argv[])
{
int rv;
async_started = 0;
quit_please = 0;
buffers_received = 0;
signal(SIGINT, sighandler);
printf("Opening output file...\n");
outf = fopen("rtlsdr_out.bin", "w");
if(outf == NULL) {
printf("Error opening output file: %d.\nExiting.\n", errno);
return 1;
}
rv = rtlsdr_get_device_count();
if(rv == 0) {
printf("No RTL-SDR devices found, exiting.\n");
return 2;
}
printf("Found %d device(s).\n", rv);
printf("Opening the first, '%s'...\n", rtlsdr_get_device_name(0));
rv = rtlsdr_open(&rtlsdr, 0);
if(rv != 0) {
printf("Error opening device: %d\nExiting.\n", rv);
return 3;
}
printf("Setting frequency to 315MHz...\n");
rv = rtlsdr_set_center_freq(rtlsdr, 315000000);
if(rv != 0) {
printf("Error setting frequency: %d\nExiting.\n", rv);
return 4;
}
printf("Frequency set to %uHz.\n", rtlsdr_get_center_freq(rtlsdr));
printf("Setting gain mode to automatic.\n");
rv = rtlsdr_set_tuner_gain_mode(rtlsdr, 0);
if(rv != 0) {
printf("Error setting gain mode: %d\nExiting.\n", rv);
return 5;
}
printf("Gain currently set to %d.\n", rtlsdr_get_tuner_gain(rtlsdr));
printf("Setting sample rate to 240kHz...\n");
rv = rtlsdr_set_sample_rate(rtlsdr, 240000);
if(rv != 0) {
printf("Error setting sample rate: %d\nExiting.\n", rv);
return 6;
}
printf("Sample rate set to %u.\n", rtlsdr_get_sample_rate(rtlsdr));
printf("Setting AGC on...\n");
rv = rtlsdr_set_agc_mode(rtlsdr, 1);
if(rv != 0) {
printf("Error setting AGC: %d\nExiting.\n", rv);
return 7;
}
printf("Clearing buffer and streaming data...\n");
rv = rtlsdr_reset_buffer(rtlsdr);
if(rv != 0) {
printf("Error clearing buffer: %d\nExiting.\n", rv);
return 8;
}
async_started = 1;
rv = rtlsdr_read_async(rtlsdr, read_callback, NULL, 0, 0);
if(rv != 0) {
printf("Error setting up async streaming: %d\nExiting.\n", rv);
return 9;
}
rtlsdr_cancel_async(rtlsdr);
rtlsdr_close(rtlsdr);
return 0;
}