LimeSDR Mini: DCIQ vs. FILTER calibration

Projects LimeSDR
1

Hello,

I’m using the following code for initialization:

using namespace lime;
using namespace std::literals::string_view_literals;
std::unique_ptr<lime::RFStream> stream;
SDRConfig config;
StreamConfig streamCfg;
/******************************************************************************/
static void LogCallback(LogLevel lvl, const std::string& msg)
{
    printf("LogCallback[%d]: %s\n", lvl,msg.c_str());
}

int main (void)
{
   lime::registerLogHandler(LogCallback);

   std::vector<lime::DeviceHandle> listOfDevices =       lime::DeviceRegistry::enumerate();

   std::cout << "Found " << listOfDevices.size() << " devices\n";
for (const auto& item : listOfDevices)
    std::cout << item.Serialize() << std::endl;

   lime::SDRDevice* device =  lime::DeviceRegistry::makeDevice(listOfDevices.at(0));
if (device == nullptr)
{
    std::cout << "Failed to connect to SDR device\n";
    return SDR_OPEN_FAILED;
}

   rc=device->Init();
   if (rc != OpStatus::Success)
   {
      printf("Init failed.\n");
      return SDR_OPEN_FAILED;
   }
   config.channel[0].rx.enabled = true;
   config.channel[0].rx.centerFrequency = CenterFreq;
   config.channel[0].rx.sampleRate = SampFreq;
   config.channel[0].rx.oversample = 2;
   config.channel[0].rx.lpf = BandWidth;
   config.channel[0].rx.path = Antenna;
   config.channel[0].rx.calibrate = CalibrationFlag::FILTER;
   config.channel[0].rx.testSignal.enabled = false;

   config.channel[0].tx.enabled = false;
   config.channel[0].tx.sampleRate = 0;
   config.channel[0].tx.oversample = 0;
   config.channel[0].tx.path = 0;
   config.channel[0].tx.centerFrequency = 0;
   config.channel[0].tx.testSignal.enabled = false;

   std::cout << "Configuring device ...\n"sv;

   rc=device->Configure(config, 0);
  if (rc != OpStatus::Success)
  {
    printf("Configure failed.\n");
    return SDR_START_FAILED;
  }

It works. I managed to receive samples.

Then I tried to use DCIQ calibration instead of FILTER. Nothing else was modified.

In this scenario I got exception.

There are no logs explains the crash.

Can you please advise ?

Thank you,

Zvi

2

Most likely a floating point exception, division by 0, somewhere in calibration code. Similar to limeGUI crashed SIGFPE during TX calibration on LimeSDR Mini · Issue #156 · myriadrf/LimeSuiteNG · GitHub
The cause might be that you have transmitter disabled. In any case it’s a bug in algorith, not your fault.