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[Discuss-gnuradio] interworking USRP

From: Andrew Rich
Subject: [Discuss-gnuradio] interworking USRP
Date: Wed, 24 Mar 2010 05:33:10 +1000

I am trying to wrap my head around the interprocess workings of USRP and gnuradio
The FPGA contains a program that accepts commands from a C++ module ?
What is the logical presence of the hardware on LINUX ? is it at the /dev/USB device ?
Are any other USRP's on ethernet ?
I am gathering you send a few commands to the USRP and it just starts sending "listening period" data and you have to manage it on the host PC ?
I guess the easiest way way be to some how trap the data to a file and then do your processing off line while you are testing.
Perhaps to improve performance memory could be used instead of HDD ?
I am trying to also work out, at the moment I am using a DSO and capturing the values and processing the data in chunks. and  I know that the data is what I want to look at because it is triggered.
I guess you would have to turn your thinking around to like a FIFO buffer instead for a "live" stream
PS here is a dump of my latest Aircraft Mode S decoder in PERL
*                                                                    *
* Mode S decoder using Digital Scope and perl on openSUSE LINUX      *
* Andrew Rich - March 2010                                           *
*                                                                    *
Sample rate             10MS/s
Max sample              37
Cut off                 18.5
Array is                4000 points
Trigger                 on point 465
Start count             467
Pre-amble               Match
DF starts               at 547
DF value                17
Type                    ADS-B squitter
Address                 7C6C5A
FT value                is 4
Type                    Identity CAT set A
FLTID                   VOZ446

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