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SDR: Add option to set local oscillator (LO) offset

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By default it is set to -1 MHz.
This commit is contained in:
Andreas Eversberg
2017-12-04 14:12:11 +01:00
parent c49ee3b2a8
commit 9f901384de
10 changed files with 58 additions and 30 deletions
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26
src/libsdr/sdr_config.c
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@@ -32,13 +32,14 @@ static int got_init = 0;
extern int use_sdr;
sdr_config_t *sdr_config = NULL;
void sdr_config_init(void)
void sdr_config_init(double lo_offset)
{
sdr_config = calloc(1, sizeof(*sdr_config));
memset(sdr_config, 0, sizeof(*sdr_config));
sdr_config->device_args = "";
sdr_config->stream_args = "";
sdr_config->tune_args = "";
sdr_config->lo_offset = lo_offset;
got_init = 1;
}
@@ -65,6 +66,9 @@ void sdr_config_print_help(void)
printf(" --sdr-samplerate <samplerate>\n");
printf(" Sample rate to use with SDR. By default it equals the regular sample\n");
printf(" rate.\n");
printf(" --sdr-lo-offset <Hz>\n");
printf(" Give frequency offset in Hz to move the local oscillator away from the\n");
printf(" target frequency. (default = %.0f)\n", sdr_config->lo_offset);
printf(" --sdr-bandwidth <bandwidth>\n");
printf(" Give IF filter bandwidth to use. If not, sample rate is used.\n");
printf(" --sdr-rx-antenna <name>\n");
@@ -109,13 +113,14 @@ void sdr_config_print_hotkeys(void)
#define OPT_SDR_RX_GAIN 1508
#define OPT_SDR_TX_GAIN 1509
#define OPT_SDR_SAMPLERATE 1510
#define OPT_SDR_BANDWIDTH 1511
#define OPT_WRITE_IQ_RX_WAVE 1512
#define OPT_WRITE_IQ_TX_WAVE 1513
#define OPT_READ_IQ_RX_WAVE 1514
#define OPT_READ_IQ_TX_WAVE 1515
#define OPT_SDR_SWAP_LINKS 1516
#define OPT_SDR_UHD_TX_TS 1517
#define OPT_SDR_LO_OFFSET 1511
#define OPT_SDR_BANDWIDTH 1512
#define OPT_WRITE_IQ_RX_WAVE 1513
#define OPT_WRITE_IQ_TX_WAVE 1514
#define OPT_READ_IQ_RX_WAVE 1515
#define OPT_READ_IQ_TX_WAVE 1516
#define OPT_SDR_SWAP_LINKS 1517
#define OPT_SDR_UHD_TX_TS 1518
struct option sdr_config_long_options[] = {
{"sdr-uhd", 0, 0, OPT_SDR_UHD},
@@ -125,6 +130,7 @@ struct option sdr_config_long_options[] = {
{"sdr-stream-args", 1, 0, OPT_SDR_STREAM_ARGS},
{"sdr-tune-args", 1, 0, OPT_SDR_TUNE_ARGS},
{"sdr-samplerate", 1, 0, OPT_SDR_SAMPLERATE},
{"sdr-lo-offset", 1, 0, OPT_SDR_LO_OFFSET},
{"sdr-bandwidth", 1, 0, OPT_SDR_BANDWIDTH},
{"sdr-rx-antenna", 1, 0, OPT_SDR_RX_ANTENNA},
{"sdr-tx-antenna", 1, 0, OPT_SDR_TX_ANTENNA},
@@ -184,6 +190,10 @@ int sdr_config_opt_switch(int c, int *skip_args)
sdr_config->samplerate = atoi(optarg);
*skip_args += 2;
break;
case OPT_SDR_LO_OFFSET:
sdr_config->lo_offset = atof(optarg);
*skip_args += 2;
break;
case OPT_SDR_BANDWIDTH:
sdr_config->bandwidth = atof(optarg);
*skip_args += 2;