Re: [Discuss-gnuradio] UHD Announcement - April 23rd 2010

[Douglas Geiger]

On Mon, Apr 26, 2010 at 3:13 PM, Douglas Geiger
<address@hidden> wrote:

> Josh,
>  Trying it out on one of my USRP2's here, with an RFX2400. The build
> went well: libuhd, firmware and fpga images all built fine. And
> building the gr-uhd branch of gnuradio had no problems either,
> although I haven't gotten to the point of being able to use it yet:  I
> seem to be having trouble with the USRP2 registering as being found.
> For example, if I run uhd_find_devices, I get:
>
>> $ uhd_find_devices
>> No UHD Devices Found
>
> Opening up wireshark, I can see that the host and USRP2 are
> communicating over UDP (with the correct IP addresses, it seems to me
> at least):
>
>> 43    14:56:36.672264    192.168.10.1    192.168.10.255    UDP    Source 
>> port: 40243  Destination port: 49152
>> 44    14:56:36.672336    192.168.10.2    192.168.10.1    UDP    Source port: 
>> 49152  Destination port: 40243
>
> Host has the IP address 192.168.10.1 on the interface connected to the
> USRP2, and the USRP2 appears to have the default 192.168.10.2. I can
> send the contents of the UDP packets if you'd like to see them.
> Taking a quick look at the usrp2::find function, it looks like it's
> supposed to be waiting in a while loop until a timeout occurs, is it
> possible the timeout is happening before the response came from the
> USRP2? Or have I perhaps made some simple mistake?
>  Thanks,
>  Doug
>

To follow up: it appears that it does work, at least libuhd + gr-uhd +
grc works.  For example, if I open up GRC, throw in a UHD simple
source, and graphical FFT block and set appropriate parameters, I do
see what I expect: a nice FFT plot of whatever bit of spectrum I've
specified. So I suspect that I am running into some bug in
uhd_find_device.
 Doug


-- 
Doug Geiger
address@hidden