[USRP-users] E312 Two Transmit Channel and One Receive Channel

Xingjian Chen xingjian at umass.edu
Thu Mar 21 16:06:55 EDT 2019


Dear all,
I am trying to use two tx channels and one rx channel at the same time. Now, I can do 1 tx and 1 rx work at the same time no matter which tx channel I use. However, I cannot make 2 tx channels working with 1 rx properly. I narrow down to a point that in my cpp control file in host computer. As long as I set both tx channel for the streamer to true, the received signal becomes 1/4 cycle. Please check the pictures below or in the attachment.

    tx_radio_ctrl->set_tx_streamer(true, tx_chan);
    tx_radio_ctrl->set_tx_streamer(true, tx_chan_1);
    rx_radio_ctrl->set_rx_streamer(true, rx_chan);

When I check in the FPGA code in the receiving chain, I see that the m_axis_data_tvalid is switching between high and low. I am wondering if there is any way to set up in cpp or host computer such that forcing the rx radio to keep streaming without any break when using 2 tx channels? I tried uhd::stream_cmd_t stream_cmd(uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS);
but no luck. Thank you in advance!

[cid:c8f36ebb-236f-43c4-a47d-b21e918e0ff8]
[cid:e2562419-9ba9-4230-bf9c-60eb27d30da3]
[cid:b067b50d-76d9-4964-95ff-2d39b5b6cc79]

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