Hi all, I've been working on porting an old gnuradio out-of-tree block [1] to latest upstream gnuradio. The port is available in [2]. The block implements a reader for RFID tags on top of an USRP v1. The C++ code was quite easy to port, but I'm stuck with the Python application I'm interested in [3]. In particular, it seems that the connect()s are broken and I cannot build the flowgraph, resulting in a RuntimeError when starting the app: RuntimeError: gr uhd usrp sink(16): insufficient connected input ports (2 needed, 1 connected) Relevant code snippet (currently commented): https://github.com/aelog/QuarkNet/blob/port/gr-usrp_reader_gen2/apps/WISP_reader.py#L165 How should I debug this issue? Is there an easy way to check what every block I'm using expects to be connected with? Best regards, Elvis [1]: https://github.com/pengyuzhang/QuarkNet/tree/master/usrp_reader_gen2 [2]: https://github.com/aelog/QuarkNet/tree/port/gr-usrp_reader_gen2 [3]: https://github.com/pengyuzhang/QuarkNet/blob/master/usrp_reader_gen2/apps/WISP_reader.py

2016-05-19 13:50 GMT+02:00 Elvis Angelaccio <angelaccioelvis@gmail.com>: > Hi all, > I've been working on porting an old gnuradio out-of-tree block [1] to > latest upstream gnuradio. The port is available in [2]. The block > implements a reader for RFID tags on top of an USRP v1. > > The C++ code was quite easy to port, but I'm stuck with the Python > application I'm interested in [3]. > > In particular, it seems that the connect()s are broken and I cannot > build the flowgraph, resulting in a RuntimeError when starting the > app: > > RuntimeError: gr uhd usrp sink(16): insufficient connected input ports > (2 needed, 1 connected) > > Relevant code snippet (currently commented): > https://github.com/aelog/QuarkNet/blob/port/gr-usrp_reader_gen2/apps/WISP_reader.py#L165 > > How should I debug this issue? Is there an easy way to check what > every block I'm using expects to be connected with? Follow up: turns out the issue was the `channel` argument of uhd.stream_args. I was using channels=range(2), while channels=range(1) makes the RuntimeError disappear. What's the meaning of this parameter? I have 2 daughterboards, both attached to the TX/RX ports. Can I use both even if channels is set to range(1) ? > > Best regards, > Elvis > > > [1]: https://github.com/pengyuzhang/QuarkNet/tree/master/usrp_reader_gen2 > [2]: https://github.com/aelog/QuarkNet/tree/port/gr-usrp_reader_gen2 > [3]: https://github.com/pengyuzhang/QuarkNet/blob/master/usrp_reader_gen2/apps/WISP_reader.py

2016-05-19 14:43 GMT+02:00 Elvis Angelaccio <angelaccioelvis@gmail.com>: > 2016-05-19 13:50 GMT+02:00 Elvis Angelaccio <angelaccioelvis@gmail.com>: >> Hi all, >> I've been working on porting an old gnuradio out-of-tree block [1] to >> latest upstream gnuradio. The port is available in [2]. The block >> implements a reader for RFID tags on top of an USRP v1. >> >> The C++ code was quite easy to port, but I'm stuck with the Python >> application I'm interested in [3]. >> >> In particular, it seems that the connect()s are broken and I cannot >> build the flowgraph, resulting in a RuntimeError when starting the >> app: >> >> RuntimeError: gr uhd usrp sink(16): insufficient connected input ports >> (2 needed, 1 connected) >> >> Relevant code snippet (currently commented): >> https://github.com/aelog/QuarkNet/blob/port/gr-usrp_reader_gen2/apps/WISP_reader.py#L165 >> >> How should I debug this issue? Is there an easy way to check what >> every block I'm using expects to be connected with? > > Follow up: turns out the issue was the `channel` argument of uhd.stream_args. > I was using channels=range(2), while channels=range(1) makes the > RuntimeError disappear. > > What's the meaning of this parameter? I have 2 daughterboards, both > attached to the TX/RX ports. Can I use both even if channels is set to > range(1) ? Not sure if related, but my calls uhd.tune_request(freq=915e6) always return 0... > > > >> >> Best regards, >> Elvis >> >> >> [1]: https://github.com/pengyuzhang/QuarkNet/tree/master/usrp_reader_gen2 >> [2]: https://github.com/aelog/QuarkNet/tree/port/gr-usrp_reader_gen2 >> [3]: https://github.com/pengyuzhang/QuarkNet/blob/master/usrp_reader_gen2/apps/WISP_reader.py