Re: [Discuss-gnuradio] Overruns B200 802.11 receiver

[Cristian Rodríguez]

Hi.

For me worked as follows:

The reference page transport_udp_sockbufs. i modified the next two:

• recv_frame_size: The size of a single receive buffer in bytes
• num_recv_frames: The number of receive buffers to allocate

Thus, i can manage more samples. It is basically, increasing the buffer amount and the size of each one.

You define it in the USRP source parameter: device Arguments.

If you want to put several of them, you have to separate by a semicolon.

2017-08-11 8:56 GMT-05:00 Markley da Silva Mendes <address@hidden>:

Hello everyone,

I have a USRP B200 card and I'm doing a test of the receiver example provided by the gr-ieee802-11 block, but when I run this example I see in the terminal a sequence of the letter "O", after some time this sequence is stopped, And not being able to discover any WiFi network.

Here the terminal of running wifi_rc.grc

  Generating: '/home/labora/prefix/default/src/gr-ieee-80211/examples/wifi_rx.py'

  Executing: /usr/bin/python2 -u /home/labora/prefix/default/src/gr-ieee-80211/examples/wifi_rx.py

  [INFO] [UHDlinux; GNU C++ version 6.2.0 20161005; Boost_106100; UHD_3.11.0.git-181-g8f9f4184] 

  [INFO] [B200] Detected Device: B200

  [INFO] [B200] Operating over USB 3.

  [INFO] [B200] Initialize CODEC control...

  [INFO] [B200] Initialize Radio control...

  [INFO] [B200] Performing register loopback test... 

  [INFO] [B200] pass

  [INFO] [AD936X] Performing CODEC loopback test... 

  [INFO] [AD936X] CODEC loopback test passed

  [INFO] [B200] Setting master clock rate selection to 'automatic'.

  [INFO] [B200] Asking for clock rate 16.000000 MHz... 

  [INFO] [B200] Actually got clock rate 16.000000 MHz.

  [INFO] [CORES] Performing timer loopback test... 

  [INFO] [CORES] Timer loopback test passed

  [INFO] [B200] Asking for clock rate 20.000000 MHz... 

  [INFO] [B200] Actually got clock rate 20.000000 MHz.

  [INFO] [CORES] Performing timer loopback test... 

  [INFO] [CORES] Timer loopback test passed

 OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOencoding: 4 - length: 14 - symbols: 2

  length: 10

  new mac frame  (length 10)

  =========================================

  frame too short to parse (<20)

 OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO

  >>> Done

In some research I find out this error, it's the overruns (or overflows), but I did not figure out the solution. I run the benchmark_rate but the return does not show that there was any error.

Benchmark_rate command

  address@hidden:/home/labora/prefix/default/lib/uhd/examples# ./benchmark_rate --rx_rate 20e6 --tx_rate 20e6

  [INFO] [UHDlinux; GNU C++ version 6.2.0 20161005; Boost_106100; UHD_3.11.0.git-181-g8f9f4184] 

  Creating the usrp device with: ...

  [INFO] [B200] Detected Device: B200

  [INFO] [B200] Operating over USB 3.

  [INFO] [B200] Initialize CODEC control...

  [INFO] [B200] Initialize Radio control...

  [INFO] [B200] Performing register loopback test... 

  [INFO] [B200] pass

  [INFO] [AD936X] Performing CODEC loopback test... 

  [INFO] [AD936X] CODEC loopback test passed

  [INFO] [B200] Setting master clock rate selection to 'automatic'.

  [INFO] [B200] Asking for clock rate 16.000000 MHz... 

  [INFO] [B200] Actually got clock rate 16.000000 MHz.

  [INFO] [CORES] Performing timer loopback test... 

  [INFO] [CORES] Timer loopback test passed

  Using Device: Single USRP:

    Device: B-Series Device

    Mboard 0: B200

    RX Channel: 0

      RX DSP: 0

      RX Dboard: A

      RX Subdev: FE-RX1

    TX Channel: 0

      TX DSP: 0

      TX Dboard: A

      TX Subdev: FE-TX1

  Setting device timestamp to 0...

  [INFO] [B200] Asking for clock rate 20.000000 MHz... 

  [INFO] [B200] Actually got clock rate 20.000000 MHz.

  [INFO] [CORES] Performing timer loopback test... 

  [INFO] [CORES] Timer loopback test passed

  Testing receive rate 20.000000 Msps on 1 channels

  Testing transmit rate 20.000000 Msps on 1 channels

  Benchmark rate summary:

    Num received samples:    200445992

    Num dropped samples:     0

    Num overflows detected:  0

    Num transmitted samples: 200064676

    Num sequence errors:     0

    Num underflows detected: 0

    Num late commands:       0

    Num timeouts:            0

  Done!

Anyone have idea for solving my problem?

Thanks in advance for your help

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