[USRP-users] matlab problems with b210

Ethem Sozer Ethem.Sozer at mathworks.com
Mon Oct 19 09:20:27 EDT 2015


Hi John,
If you are on Windows, please try the following:

http://files.ettus.com/manual/page_transport.html

Under “Windows specific notes”.

You can also run the following from MATLAB command windows to test your radio’s connection to the host computer:

call_uhd_app('b2xx_fx3_utils','-s')

Regards,
Ethem

From: USRP-users [mailto:usrp-users-bounces at lists.ettus.com] On Behalf Of Carel Combrink via USRP-users
Sent: Monday, October 19, 2015 5:41 AM
To: john liu <johncorad1988 at gmail.com>
Cc: usrp-users <usrp-users at lists.ettus.com>
Subject: Re: [USRP-users] matlab problems with b210

Hi John,

I do not have experience with interfacing with the hardware from MATLAB but for that error you need to increase the amount of read and write buffers on your OS.

I am assuming you are running Linux, if now then you need to find out how this is done in Windows.

On Linux (Ubuntu):
Edit the file /etc/sysctl.conf
Add something in the line of the following:
net.core.rmem_max=128000000
net.core.wmem_max=128000000
Then restart the computer

Just check what is acceptable for your system, that is what I have set on mine. Perhaps make it 2752000 as suggested by the error.

Regards,

On Mon, Oct 19, 2015 at 10:58 AM, john liu via USRP-users <usrp-users at lists.ettus.com<mailto:usrp-users at lists.ettus.com>> wrote:
    Dear all,

        when we  connect to the B210 with matlab,  the following errors often happened.

Could not execute UHD driver command in 'receiveData_c':
libmwusrp_uhd_capi:receiveData:ErrWrongRecvSize
Did not receive expected number of samples in a burst reception.
This is likely due to overflow within the burst.
Use 'sysctl' to update the OS socket buffer size.
Expected: 2752000
Found : 94120

I did't know wether these errors is related  to the transmission of the usb3.0 speed.
thank you for your help
best regards
John

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