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limesdr: add ability to set bandwidth 

Add ability to set calibration bandwidth via input command line options.
By default the bandwidth is equal to 2.5 MHz.

Test: connect LimeSDR device, try to set different bandwidth and check
    logs:
    $ ./dump1090 --device-type limesdr --limesdr-bw 5000000
    $ ./dump1090 --device-type limesdr --limesdr-bw 500000

Signed-off-by: Gluttton <gluttton@ukr.net>
This commit is contained in:
Gluttton 2020-07-31 00:06:33 +03:00
parent 95ae1a92be
commit bb158d929c
1 changed files with 6 additions and 1 deletions
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7
sdr_limesdr.c
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@ -61,6 +61,7 @@ static struct {
size_t oversample;
float gain;
float lpfbw;
float bw;
lms_info_str_t serial;
int bytes_in_sample;
iq_convert_fn converter;
@ -104,6 +105,7 @@ void limesdrInitConfig()
LimeSDR.oversample = 0; // default oversample
LimeSDR.gain = 0.75;
LimeSDR.lpfbw = 2400000.0;
LimeSDR.bw = 2.5e6; // the minimal supported value
LimeSDR.serial[0] = '\0';
LimeSDR.bytes_in_sample = 2 * sizeof(int16_t); // hardcoded for LMS_FMT_I16
@ -120,6 +122,7 @@ void limesdrShowHelp()
printf("--limesdr-oversample set RF oversampling ratio\n");
printf("--limesdr-gain set normalized gain\n");
printf("--limesdr-lpfbw set LPF bandwidth\n");
printf("--limesdr-bw set bandwidth\n");
printf("\n");
}
@ -140,6 +143,8 @@ bool limesdrHandleOption(int argc, char **argv, int *jptr)
LimeSDR.gain = atof(argv[++j]);
} else if (!strcmp(argv[j], "--limesdr-lpfbw") && more) {
LimeSDR.lpfbw = atof(argv[++j]);
} else if (!strcmp(argv[j], "--limesdr-bw") && more) {
LimeSDR.bw = atof(argv[++j]);
} else {
return false;
}
@ -235,7 +240,7 @@ bool limesdrOpen(void)
goto error;
}
if (LMS_Calibrate(LimeSDR.dev, LMS_CH_RX, LimeSDR.stream.channel, 2.5e6/*0.5e5*/, 0)) {
if (LMS_Calibrate(LimeSDR.dev, LMS_CH_RX, LimeSDR.stream.channel, LimeSDR.bw, 0)) {
limesdrLogHandler(LMS_LOG_ERROR, "unable to calibrate device");
goto error;
}