Hi Benjamin,
In my case the issue was caused by using the wrong device address format. To fix the issue, try the following:Variable
On Mon, Sep 14, 2015 at 7:50 AM, Benjamin Nuss [via GnuRadio] <[hidden email]> 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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