LimeSDR : Runtime warning in FFT view

Projects LimeSDR
1

Hello,

I’m using the GUI with the following parameters:

Sample freq. = 18.285714[MHz]

Band width = 12[MHz]

Center freq. = 530[MHz]

Over sample = 2

RX Gain = 30[dB]

Rx Path= 3

Upon START in the fftviewer I’m gettin the following errors:

[14:06:26] WARNING: USB ep:83 Rx0: 22.360 MB/s | TS:621722640 pkt:192075 o:0(+0) l:189446(+5459) dma:192075/192091(+16) swFIFO:0[14:06:27] 
WARNING: USB ep:83 Rx0: 22.491 MB/s | TS:640013280 pkt:197566 o:0(+0) l:194936(+5490) dma:197566/197582(+16) swFIFO:0[14:06:28] 
WARNING: USB ep:83 Rx0: 22.561 MB/s | TS:658276720 pkt:203074 o:0(+0) l:200441(+5505) dma:203074/203090(+16) swFIFO:0[14:06:29] 
WARNING: USB ep:83 Rx0: 22.692 MB/s | TS:676580960 pkt:208614 o:0(+0) l:205979(+5538) dma:208614/208630(+16) swFIFO:0[14:06:30] 
WARNING: USB ep:83 Rx0: 22.675 MB/s | TS:694863440 pkt:214150 o:0(+0) l:211511(+5532) dma:214150/214166(+16) swFIFO:0[14:06:31] 
WARNING: USB ep:83 Rx0: 21.262 MB/s | TS:713147280 pkt:219341 o:0(+0) l:216702(+5191) dma:219341/219357(+16) swFIFO:0

According to ‘Gemini’ it means data loss. When I tried sample rate of 1[MHz] I did not get any warninig message. The SDR is connected to a USB3 (blue connector).

Does it make sense ?

Thank you,

Zvi

2

I assume you’re using LimeSDR Mini. Sometimes if there were any issues during device plug in to the USB port, it could be enumerated as a USB 2.0 device. That would limit the data rate to half duplex max 40MB/s. I suspect that is the case you’re seeing here, try to unplug the device, and reinsert into the port again. Verify that the devices gets enumerated as USB 3.0.

3

Hi,

I double checked that the Lime is enumerated as USB 3.1

But if the sample rate > 10MHz, there are many losses.

Is it connected directly to the PC or with a 50cm USB3 cable.

The USB3 rate is very high compared to the stream rate.

Thank you,

Zvi

4

Hello,

Can you please explain the losses we are getting ?

Can I measure the USB 3.x input rate to my PC in another way in order to prove that the rate it OK ?

Can the Mini keep the samples in its internal memory and I will read them upon stream stop ?

Is there a paid support plan for this product ?

Thank you,

Zvi