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
This sounds like a problem with your USB controller -- what type is it?
What hardware rev of b200 do you have?
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