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sdr_soapy.c: add support for --device-setting option #285

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Merged
mutability merged 1 commit into from
Mar 25, 2026
Merged

sdr_soapy.c: add support for --device-setting option #285

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38 changes: 38 additions & 0 deletions sdr_soapy.c
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,9 @@ static struct {
int num_gain_elements;
char **gain_elements;

unsigned num_settings;
char **settings;

SoapySDRRange gain_range;
int current_gain_step;
} SOAPY;
Expand Down Expand Up @@ -88,6 +91,8 @@ void soapyInitConfig()
SOAPY.enable_agc = false;
SOAPY.num_gain_elements = 0;
SOAPY.gain_elements = NULL;
SOAPY.num_settings = 0;
SOAPY.settings = NULL;
}

void soapyShowHelp()
Expand All @@ -100,6 +105,7 @@ void soapyShowHelp()
printf("--bandwidth <hz> set the baseband filter width (default: 3MHz, SDRPlay: 5MHz)\n");
printf("--enable-agc enable Automatic Gain Control if supported by device\n");
printf("--gain-element <name>:<db> set gain in dB for a named gain element\n");
printf("--device-setting <k>=<v> set device-specific setting\n");
printf("\n");
}

Expand All @@ -126,6 +132,16 @@ bool soapyHandleOption(int argc, char **argv, int *jptr)
perror("strdup");
abort();
}
} else if (!strcmp(argv[j], "--device-setting") && more) {
++SOAPY.num_settings;
if (! (SOAPY.settings = realloc(SOAPY.settings, SOAPY.num_settings * sizeof(*SOAPY.settings))) ) {
perror("realloc");
abort();
}
if (! (SOAPY.settings[SOAPY.num_settings-1] = strdup(argv[++j])) ) {
perror("strdup");
abort();
}
} else {
return false;
}
Expand Down Expand Up @@ -230,6 +246,22 @@ bool soapyOpen(void)
// Configure everything
//

// Device settings
for (unsigned i = 0; i < SOAPY.num_settings; ++i) {
char *element = SOAPY.settings[i];
char *sep = strchr(element, '=');
if (!sep || !sep[1]) {
fprintf(stderr, "soapy: don't understand a device setting of '%s' (should be formatted as <key>=<value>)\n", element);
goto error;
}
*sep = 0;

if (SoapySDRDevice_writeSetting(SOAPY.dev, element, sep+1) != 0) {
fprintf(stderr, "soapy: writeSetting(%s,%s) failed: %s\n", element, sep+1, SoapySDRDevice_lastError());
goto error;
}
}

if (SOAPY.channel) {
size_t supported_channels = SoapySDRDevice_getNumChannels(SOAPY.dev, SOAPY_SDR_RX);
if (SOAPY.channel >= supported_channels) {
Expand Down Expand Up @@ -517,6 +549,12 @@ void soapyClose()
}
free(SOAPY.gain_elements);
SOAPY.gain_elements = NULL;

for (unsigned i = 0; i < SOAPY.num_settings; ++i) {
free(SOAPY.settings[i]);
}
free(SOAPY.settings);
SOAPY.settings = NULL;
}

//
Expand Down