Re: [Discuss-gnuradio] Trying to use latest version of UHD

[Josh Blum]

On 10/26/2010 11:25 PM, Per Zetterberg wrote:
> If I have "no_chan" usrp2 with XCVR2450 would this work:
>
>   uhd::usrp::subdev_spec_t e("");
>      for (uint32_t i1=0;i1<no_chan;i1++) {
>        d_mdev->set_rx_subdev_spec(e, i1);
>        d_mdev->set_tx_subdev_spec(e, i1);
>      };

This is the default behavior; the constructor is already doing this, so 
it is not necessary. Unless you have USRP1 or a basic board, setting the 
subdevice specification is not necessary since there is only one 
possible choice and it is automatically selected.

> Or should I write:
>
> uhd::usrp::subdev_spec_t e("0:A");

That would probably fail, I believe that XCVR2450 has only one 
sub-device named 0. So to this effect: "0:0" ":" "0:" ":0" would all 
work for XCVR2450 on the USRP2. Also "" for the reason above.

So theres to ways to think about this:

1) I know my usrp has only one daughterboard slot and I know my 
daugterboard has only one subdevice. So I am not gonna set anything 
special, because the automatic behavior is right for me.

2) I like to explicit about things, I have a daughter board slot "0", 
and on my daughterboard I have a subdevice "0". So I am going to say, 
set this subdevice specification to "0:0".

> ?

http://www.ettus.com/uhd_docs/manual/html/dboards.html#basic-rx-and-and-lfrx

http://www.ettus.com/uhd_docs/doxygen/html/classuhd_1_1usrp_1_1subdev__spec__t.html

http://www.ettus.com/uhd_docs/doxygen/html/classuhd_1_1usrp_1_1single__usrp.html#aafa207334ad368fc761602e2c965bc93

Yes, i agree, needs more documentation, zzzzz....

-Josh

> BR/
> Per
>
>
> On Tue, 2010-10-26 at 09:48 -0700, Josh Blum wrote:
> > I fixed a typo and pushed it to the master. When you leave the dboard
> > name blank, and you have a single slot, it should use the name of the
> > only daughterboard slot on your usrp. Except for the typo...
> >
> > So, to use the AB subdev on basic RX on usrp2, the following would work:
> >
> > "0:AB"
> > ":AB" - was previously broken by the typo
> > ""    - empty string automatically picks the first subdevice 0:AB
> >
> > -josh
> >
> > On 10/26/2010 05:25 AM, Per Zetterberg wrote:
> > > Hi Josh and List,
> > >
> > > I am now trying to use the latest version of UHD. I am working with one or two 
> > > USRP2s (I have previously worked successfully with up to four USPR2s).
> > >
> > > I tried the following which I though should be the way to handle a general 
> > > number of USRP2s (no_ant).
> > >
> > >
> > >     std::string abcd_string("ABCDEFGHIJKLMNOPQRSTUVXYZ");
> > >     uhd::usrp::subdev_spec_t abcd(":"+abcd_string.substr(0,no_ant));
> > >     d_mdev->set_rx_subdev_spec(abcd, uhd::usrp::multi_usrp::ALL_MBOARDS);
> > >     d_mdev->set_tx_subdev_spec(abcd, uhd::usrp::multi_usrp::ALL_MBOARDS);
> > >
> > >
> > > However, I get the error:
> > >
> > > error: Validate rx subdev spec failed: :AB
> > >       assertion failed:
> > >      is not a valid rx dboard name.
> > >     possible values are: [0].
> > >
> > > Then I made a different intepretation and tried:
> > >
> > >     uhd::usrp::subdev_spec_t e("0");
> > >
> > >     for (uint32_t i1=0;i1<no_ant;i1++) {
> > >         d_mdev->set_rx_subdev_spec(e, i1);
> > >         d_mdev->set_tx_subdev_spec(e, i1);
> > >     }
> > >
> > > However, the results are still in error.
> > >
> > > ??
> > >
> > > BR/
> > > Per
> > > _______________________________________________
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> >
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