Hi Benjamin,
In my case the issue was caused by using the wrong device address format.
To fix the issue, try the following:
Use a new single '*variable*' block for the IP addresses of the* two USRP
devices*. In my case I use the following format:
*Variable*
*ID:* addr
*Value:* "addr0=192.160.10.2, add1=192.160.20.2"
Where *addr0 *is the address of the USRP device with the Tx daughter-board
installed. In the *UHD USRP Sink* and *UHD USRP Source* blocks, in the
Device Address space, type: *addr*
Hope this solves the problem.
Regards,
Khalid
On Mon, Sep 14, 2015 at 7:50 AM, Benjamin Nuss [via GnuRadio] <
ml-node+s4n56029...@n7.nabble.com> wrote:
> Hi,
>
> has the problem been solved in the meantime? I'm triying to build up a 1x2
> MIMO setup with two N210 (2 SBX daughterboards). One Transmit channel with
> one of the TX/RX ports and two receive channels with the two RX2 ports. The
> two USRPs are connected via a MIMO cable.
>
> The N210 (TX: addr=172.22.77.72 / RX: addr1=172.22.77.72) that is used for
> transmit and receive ist the master and uses a GPSDO as clock. The time
> source is default. The other USRP (addr0=172.22.77.71) is intended to be
> synchronized via the MIMO cable.
>
>
>
> But when I execute the flowgraph the error message
>
> Uthread[thread-per-block[2]: <block gr uhd usrp source (23)>]:
> RuntimeError: fifo ctrl timed out looking for acks
>
> occurs. Though the transmit path works and the signal is send out. The
> window of the scope opens as well, but it doesn't show anything and no
> samples are received if you try to save them to a bin file.
> If the USRP source is splitted up into two sources, everything works fine.
> But in this case, the samples of the two USRPs are not aligned and the
> delay between the two paths is random.
>
> Thank you in advance
> Benjamin
>
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