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