LimeSDR Mini: Readback of configurtion

Projects LimeSDR
1

Hello,

I used the following configurtion:

config.channel[0].rx.enabled = true;
config.channel[0].rx.gain[eGainTypes::LNA] = 30;
config.channel[0].rx.centerFrequency = 530e6;
config.channel[0].rx.sampleRate = 10e6;
config.channel[0].rx.oversample = 2;
config.channel[0].rx.lpf = 12e6
config.channel[0].rx.path = 3;

Status = device->Configure(config, 0);
//Status = OpStatus::Success

Then I tried to read back the configuration:

double BandWidth= device->GetLowPassFilter(0, TRXDir::Rx, 0));
uint32_t Antenna = device->GetAntenna(0, TRXDir::Rx, 0);
//BandWidth = 0
//Antenna = 1

Can you please explain why I got wrong values for BandWidth, Antenna ?

Thank you,

Zvi

2

Hello,

After:

Status = device->Configure(config, 0);

I called:

Status = device->SetLowPassFilter(0, TRXDir::Rx, 0, BandWidth);
if (Status != OpStatus::Success)
{
    printf("SetLowPassFilter failed\n");
    return -1;
}

double BandWidth= device->GetLowPassFilter(0, TRXDir::Rx, 0));
uint32_t Antenna = device->GetAntenna(0, TRXDir::Rx, 0);
//BandWidth = 12000000
//Antenna = 3

For some reason, calling SetLowPassFilter caused the right readback.

Does it make sense ?

Thank you,

Zvi

3

Hi, the low pass filter is analog, and it’s actual exact value cannot be readback, so the returned value is the last cached value that has been configured.

1 Like
4

Hi,

Thank you very much !

Best regards,

Zvi