Re: [Discuss-gnuradio] Tx and Rx on USRP simultaneously, device already claimed

[Martin Braun]

Yeah, or UHD can't match the two UHD sessions. There is no downside to it -- you just need to make sure that the TX subdev spec is set correctly, and if you only want to TX on one channel, you need to pick the correct channel index.

On Fri, Oct 11, 2019 at 3:30 PM Mark Wagner <address@hidden> wrote:

Ahh, are you saying I would need to make the same 6 device combo for the USRP source if I wanted to transmit on one antenna? 

On Fri, Oct 11, 2019 at 3:28 PM Martin Braun <address@hidden> wrote:

Can you make sure you're using the exact same device addr for both the sink and source blocks. What you're trying only works if the TX and RX are happening from the same process.

-- M

On Mon, Oct 7, 2019 at 11:09 AM Mark Wagner <address@hidden> wrote:

Hey everyone,

I'm trying to transmit from the TX/RX port of a USRP while receiving from RX2 but I'm getting a 'device already claimed' error message. Here are some details:

My USRP sink block uses multiple USRP addresses, i.e. 

"addr0=192.168.1.2,addr1=192.168.2.2,addr3=192.168.3.2,..."

and each address goes to a different USRP in an array. I want to transmit a calibration tone across the array from the TX channel of the first USRP (addr0), but when I add a USRP source block it gives a 'device already claimed' message. This doesn't happen when I make individual USRP sink blocks for each USRP in the array. 

Unfortunately if I separate my devices into several USRP sink blocks I can't guarantee the devices will be synched to the PPS. Is there a workaround for this?

-Mark

--

Mark Wagner

University of California San Diego

Electrical and Computer Engineering
 

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Mark Wagner

University of California San Diego

Electrical and Computer Engineering