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limesdr: add ability to set LPF bandwidth 

Add ability to set LPF bandwidth via input command line options.
By default the bandwidth is equal to the default sample rate 2.4 MHz.

Test: connect LimeSDR device, try to set different bandwidth and check
    logs:
    $ ./dump1090 --device-type limesdr --limesdr-lpfbw 2500000
    $ ./dump1090 --device-type limesdr --limesdr-lpfbw 500000

Signed-off-by: Gluttton <gluttton@ukr.net>
This commit is contained in:
Gluttton 2020-07-30 23:45:14 +03:00
parent c32ed2866e
commit 95ae1a92be
1 changed files with 6 additions and 1 deletions
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7
sdr_limesdr.c
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@ -60,6 +60,7 @@ static struct {
char verbosity;
size_t oversample;
float gain;
float lpfbw;
lms_info_str_t serial;
int bytes_in_sample;
iq_convert_fn converter;
@ -102,6 +103,7 @@ void limesdrInitConfig()
LimeSDR.verbosity = LMS_LOG_INFO;
LimeSDR.oversample = 0; // default oversample
LimeSDR.gain = 0.75;
LimeSDR.lpfbw = 2400000.0;
LimeSDR.serial[0] = '\0';
LimeSDR.bytes_in_sample = 2 * sizeof(int16_t); // hardcoded for LMS_FMT_I16
@ -117,6 +119,7 @@ void limesdrShowHelp()
printf("--limesdr-channel set number of an RX channel\n");
printf("--limesdr-oversample set RF oversampling ratio\n");
printf("--limesdr-gain set normalized gain\n");
printf("--limesdr-lpfbw set LPF bandwidth\n");
printf("\n");
}
@ -135,6 +138,8 @@ bool limesdrHandleOption(int argc, char **argv, int *jptr)
LimeSDR.oversample = atoi(argv[++j]);
} else if (!strcmp(argv[j], "--limesdr-gain") && more) {
LimeSDR.gain = atof(argv[++j]);
} else if (!strcmp(argv[j], "--limesdr-lpfbw") && more) {
LimeSDR.lpfbw = atof(argv[++j]);
} else {
return false;
}
@ -218,7 +223,7 @@ bool limesdrOpen(void)
goto error;
}
if (LMS_SetLPFBW(LimeSDR.dev, LMS_CH_RX, LimeSDR.stream.channel, Modes.sample_rate)) {
if (LMS_SetLPFBW(LimeSDR.dev, LMS_CH_RX, LimeSDR.stream.channel, LimeSDR.lpfbw)) {
limesdrLogHandler(LMS_LOG_ERROR, "unable to set LP filter");
goto error;
}