Re: [Discuss-gnuradio] UHD example

[Josh Blum]

On 07/21/2010 10:36 PM, Elvis Dowson wrote:
> Hi Philip and Per,
>
> On Jul 19, 2010, at 5:57 PM, Philip Balister wrote:
>
> >  
> > http://ettus-apps.sourcerepo.com/redmine/ettus/projects/uhd/repository/revisions/master/show/host/examples
>
> The C++ examples in that folder wasn't helpful, since
>
> a. it isn't readily apparent how to take that information and use it to make a
> GRC UHD Simple Source block work
>
> I tried this GRC block, but I get an error, running under Fedora 12 x86 64-bit:
>
>
> Executing: "/home/elvis/Desktop/grc-examples/top_block.py"
>
> Current recv sock buff size: 50000000 bytes
> Current send sock buff size: 50000000 bytes
> Using: WBX TX (0x0053)
> Using: WBX RX (0x0052)
> RX samples per packet: 362
> TX samples per packet: 363
> Recv pirate num frames: 33967
> The hardware does not support the requested sample rate:
> Target sample rate: 0.032000 MSps
> Actual sample rate: 0.195312 MSps
>
> terminate called after throwing an instance of 'std::invalid_argument'
> what(): key not found in dict

right we did this last week. You requested an invalid frequency for the 
wbx and the underlying tuning logic blew a gasket. This has since been 
fixed, but you still cant use 100Khz for the WBX, nor can you sample at 
32k (hence the warning printed above).

> b. running the benchmark_rx_rate doesn't seem to work
>
> $ uhd_find_devices
> --------------------------------------------------
> -- UHD Device 0
> --------------------------------------------------
> type: usrp2
> addr: 192.168.10.2
>
>
> $ ./benchmark_rx_rate
>
> Creating the usrp device with: ...
> Current recv sock buff size: 50000000 bytes
> Current send sock buff size: 50000000 bytes
> Using: WBX TX (0x0053)
> Using: WBX RX (0x0052)
> RX samples per packet: 362
> TX samples per packet: 363
> Recv pirate num frames: 33967
> Using Device: Simple USRP:
> Device: usrp2 device
> Mboard: usrp2 mboard0 - rev 4:0
> RX DSP: usrp2 ddc0
> RX Dboard: usrp2 dboard (rx unit)
> RX Subdev: WBX TX (0x0053)
> TX DSP: usrp2 duc0
> TX Dboard: usrp2 dboard (tx unit)
> TX Subdev: WBX RX (0x0052)
>
> Testing receive rate 0.500000 Msps (10.000000 second run)
> Unexpected error on recv, exit test...
> Testing receive rate 1.000000 Msps (10.000000 second run)
> Unexpected error on recv, exit test...
> Testing receive rate 2.000000 Msps (10.000000 second run)
> Unexpected error on recv, exit test...
> Testing receive rate 4.000000 Msps (10.000000 second run)
> Unexpected error on recv, exit test...
> Testing receive rate 8.333333 Msps (10.000000 second run)
> Unexpected error on recv, exit test...
> Testing receive rate 16.666667 Msps (10.000000 second run)
> Unexpected error on recv, exit test...
> Testing receive rate 25.000000 Msps (10.000000 second run)
> Unexpected error on recv, exit test...
>
> Done!

I cant tell which git rev you are using, this might have been fixed in 
508af598a1b32345a53522b4d6d71e021f448347 In any case, pull the latest 
master and let us know.

Thanks,
-Josh