AJ, the error is telling you that you called the issue_stream_cmd() method with invalid arguments. There is no "channel" argument.
Instead, the channels are part of the stream command object itself. Do something like this: stream_cmd.channels = [0, 1] # ... rx_streamer.issue_stream_cmd(stream_cmd) Keep in mind that most daughterboards can only receive on one antenna port (exceptions are BasicRX/LFRX and TwinRX, which you are not using). If you are using UBX daughterboards, you get one RX channel from A- and B-side, respectively. --M On Tue, Mar 25, 2025 at 11:24 AM Arnaldo Sans via USRP-users < usrp-users@lists.ettus.com> wrote: > Good morning, > > > > Hope everyone is doing well. I am attempting to stream data to multiple > RXs on an on x310. More specifically, I am using TX/RX and RX2 at RFA [0, > 1]. I was reviewing the on-line “USRP Hardware Driver and USRP Manual” ( > https://files.ettus.com/manual/page_stream.html) material. Specifically, > the section on “*Introduction to Streaming”. *The authors provide a > snippet of code illustrating how to manage a RX streaming for a signal port > (below is the python code). > > > > *import uhd* > > *import numpy as np* > > *usrp = uhd.usrp.MultiUSRP("type=x300")* > > *stream_args = uhd.usrp.StreamArgs("fc32", "sc16")* > > *stream_args.args = "spp=200" # Note this setting is not valid for all > USRPs* > > *rx_streamer = usrp.get_rx_stream(stream_args)* > > *rx_metadata = uhd.types.RXMetadata()* > > *recv_buffer = np.zeros(rx_streamer.get_max_num_samps(), > dtype=np.complex64)* > > *stream_cmd = uhd.types.StreamCMD(uhd.types.StreamMode.start_cont)* > > *stream_cmd.stream_now = True* > > *rx_streamer.issue_stream_cmd(stream_cmd)* > > *while run_condition:* > > *samps = rx_streamer.recv(recv_buffer, rx_metadata)* > > *stream_cmd = uhd.types.StreamCMD(uhd.types.StreamMode.stop_cont)* > > *rx_streamer.issue_stream_cmd(stream_cmd)* > > > > I have attempted to modify the above snippet to support RX streaming into > two separate ports on the RFA (TX/RX and RX2 at RFA [0, 1]) and I have not > been successful. Below is the error message I am receiving, and I am > having trouble deciphering what it’s trying to tell me. > > > > > > *…. line 207, in main* > > * rx_streamer.issue_stream_cmd(uhd.libpyuhd.types.stream_cmd, [0,1])* > > > > *TypeError: issue_stream_cmd(): incompatible function arguments. The > following argument types are supported:* > > * 1. (self: uhd.libpyuhd.usrp.rx_streamer, arg0: > uhd.libpyuhd.types.stream_cmd) -> None* > > > > *Invoked with: <uhd.libpyuhd.usrp.rx_streamer object at 0x7faf1abc54b0>, > <class 'uhd.libpyuhd.types.stream_cmd'>, [0, 1]* > > > > > > Is there a snippet of code available that illustrates how to RX Streaming > on Multiple Channels? Alternatively, any guidance on how to approach this > error message will be very welcomed. > > > > Thank you! > > > > *Regards,* > > *AJ* > > *Graduate Researcher* > > *College of Electrical & **Computing** Engineering * > > *Florida International University* > > *10555 West Flagler Street* > > *Room 3863B* > > *Miami, FL 33174* > > *Phone:* *305-336-2541 |* *Email:* *asans...@fiu.edu <asans...@fiu.edu>* > > > > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-le...@lists.ettus.com >
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