On 06/21/2013 07:25 PM, Arturo Rinaldi wrote: > Hi folks, I've recently bumped into an issue with two GRC flow graphs > while running a rx/tx loop path interfacing with an external sensor : > > *T**X path - UHD Usrp1 Sink (sending data to the sensor)* > > http://img713.imageshack.us/img713/4540/gyz.png > > *RX path - UHD Usrp1 Source (receiving data from the sensor)* > > http://img822.imageshack.us/img822/521/dq8.png > > I'm using a USRP1 mainboard and a RFX2400 daughter board using the TX/RX > section. I can run the TX flow graph, but when i launch the other one, > the shell warns me about an UHD error. The uhd driver can't find the > usrp1 card (specifically, the *uhd source object* can't be built because > the uhd driver is not able find the usrp device), it's like the tx path > had an exclusive possession of the A:0 subdevice (the *TX/RX* one on > which I put my antenna). > > Do I have to pass some command line switches to the uhd driver to solve > this issue ? Thanks in advance. >
The device can only be opened once per process. Either run both flow graphs in the same process, or combine both flowgraphs into one flowgraph. -josh _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio