[USRP-users] RuntimeError: Could not create nirio_zero_copy transport on X310

Marius metallheart_18 at yahoo.com
Wed Oct 21 12:53:27 EDT 2015

Could not figure out the source of the problem. 
I could only traceback the issue that the error is outputted when the tb.start() is issued. More interesting is that then I use the same algorithm for receiving it works without a problem.
I guess is probably a bug for the X310.

> On 20Oct 2015, at 17:11, Marius <metallheart_18 at yahoo.com> wrote:
> Hi, 
> I get the fallowing error when I run my flowchart on the X310 USRP, :
> thread[thread-per-block[3]: <block gr uhd usrp sink (1)>]: RuntimeError: Could not create nirio_zero_copy transport. A parameter to a function was not valid. This could be a NULL pointer, a bad value, etc. (Error code -52005)
> My program initialises the time from the GPSDO with the fallowing command:
>            self.uhd_usrp_sink_0.set_time_next_pps(uhd.time_spec_t(self.uhd_usrp_sink_0.get_mboard_sensor("gps_time").to_int() + 1))
> and then starts transmitting and certain moments between a start time and a stop time. For that I use the fallowing algorithm:
>    while start_time < stopTime:
>        tb.uhd_usrp_sink_0.set_start_time(uhd.time_spec_t(start_time))                #tb is the object, instance of the class top_block
>        time_difference = int(start_time - tb.uhd_usrp_sink_0.get_time_now().get_real_seconds())
>        tb.start()
>        print “the transmission will start at", stringFromTime(start_time)          #stringFromTime is a function that converts timestamps in date.time
>        time.sleep(time_difference + active_time) #active_time is the duration of the transmission
>        tb.stop()
>        print “finished transmission at", stringFromTime(tb.uhd_usrp_sink_0.get_time_now().get_real_seconds())
>        tb.wait()
>        start_time = int(tb.get_current_time() + wait_time) + 1                # wait_time is the duration between two transmissions
> The error is outputted after the first transmission starts, and then repeated after every iteration in the while loop, but the signal is outputted only once.
> The same code runs perfectly on  USRP N210.
> I use the latest uhd version 003.010.git-65-g9117fdc9 with LFTX daughterboard and i use PCIe to connect to the USRP. The error was also present at  previous uhd version 3.8.4
> Do you have any idea what is wrong?

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