Hi Marcus,
The B200 has hardware revision 5. I am using a Lenovo T450 with an Intel(R) USB 3.0 eXtensible-Hostcontroller. Date: Mon, 28 May 2018 12:36:53 -0400 From: "Marcus D. Leech" < <mailto:mle...@ripnet.com> mle...@ripnet.com> This sounds like a problem with your USB controller -- what type is it? What hardware rev of b200 do you have? On 05/28/2018 08:11 AM, Felix via USRP-users wrote: > > Hi everyone, > > currently, I am trying to calibrate the TX power a USRP B200 device > for different gain values. To realize this, I am calling the UHD > function ?tx_samples_from_file? to send sine waves on different > frequencies over cable to a frequency analyzer. > > The calibration itself works fine. As I am trying over a range of > frequencies and gain values I call and close the UHD function several > times. > > The problem I always run into is that the USB connection will > sporadically break down at some point when I call the function again. > I receive the error message: > > ERROR: Environment Error: IOError: usb tx2 transfer status: > LIBUSB_TRANSFER_STALL > > This happens at some random time of calling the ?tx_samples_from_file? > function but once it happened, everytime I call the function again the > error reappears and the sine signal is not sent. I need to reconnect > the B200 to recover from this error. Even though the USB error occurs > I am still able to connect to the B200 so my routine will not notice > any issues and just record very low TX power values. This is a big > issue as I cannot catch the error which makes automation of the > routine difficult. > > Has anybody seen a similar problem or has an idea how this connection > issue might be fixed? > > Some remarks: > > * I use Windows 7 with UHD version 3.11.0.0-release > * I use a similar routine for RX calibration with > ?rx_samples_to_file? and I do not run into any issues there > > Best regards, > > Felix
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