Re: [Discuss-gnuradio] multiple antennas and multiple usrps

[Dan Halperin]

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On Jun 25, 2008, at 4:28 PM, Eric Blossom wrote:
> > > > 2) I have a transmitter USRP and a receiver USRP attached to the  
> > > > same
> > > > machine. I use usrp.serial_number() as suggested by Eric in many
> > > > previous mails to distinguish between them. I have a code loop like
> > > > this:
> > >
> > > Are you loading a different fpga image into the different USRPs?
> >
> > Yes, one is (was, I guess?) using std_4rx_0tx.rbf (see 1) and the
> > other was using the default.
> > Thanks,
> >
> > Dan
>
> That would do it :-)
>
> Please let me know if the (untested) code fragment I sent works out.

I ended up using the following code:

from usrpm import usrp_prims

def find_serial_number(serial):
    which = 0
    d = usrp_prims.usrp_find_device(which)
    while True:
        if not d:   # No USRP connected
            raise RuntimeError, "Unable to find USRP with Serial #  
%s" %(serial)
        if usrp_prims.usrp_unconfigured_usrp_p(d):  # Needs firmware/ 
FPGA image
            usrp_prims.usrp_load_standard_bits(which, False)
        # Turn the usb_device into a usb_device_handle
        handle = usrp_prims.usrp_open_cmd_interface(d)
        # Get the Serial # (SN) out, then close device handle
        SN = usrp_prims.usrp_serial_number(handle)
        usrp_prims.usrp_close_interface(handle)
        # Compare to desired
        if SN == serial:
            return which
        # Next USRP
        which += 1
        d = usrp_prims.usrp_find_device(which)

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