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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