On 04/07/2011 1:52 PM, Nemanja Trecakov wrote:
Hi list,
My name is Nemanja and I am working on my master theisis using USRP2
with XCVR2450, using Ubuntu 10.04 and gnuradio 3.3.0. However, I am
new to GNU radio and I need help to understand some basic things in
order to continue. I tried the gnuradio-wiki, mailing lists and google
with no success. I would be very thankful if somebody could enlighten me.
1)I want to implement some extra things in FPGA, by adding some extra
features with Xilinx ISE 12.4 in the current FPGA image.
However, on the link:
http://code.ettus.com/redmine/ettus/projects/public/wiki/U2binaries,
Raw Ethernet Driver and Universal Hardware Driver are mentioned. I
have read that UHD is the recommended one.
- WHAT IS THE DIFFERENCE between these two, WHAT ARE THEY USED FOR and
HOW CAN ONE USE THEM?
The "RAW" drivers for USRP2-family devices (including N200 and N210) are
basically deprecated. I'd start down the path of going
"UHD".
Here's the starting point for UHD:
http://code.ettus.com/redmine/ettus/projects/uhd/wiki
If you're starting from nothing, there's the "build-gnuradio" script
which downloads the latest source code for Gnu Radio, UHD, and
installs all the prerequisites, it also downloads the pre-built
firmware and FPGA images.
http://www.sbrac.org/files/build-gnuradio
2 )On the link:
http://gnuradio.org/redmine/projects/gnuradio/wiki/USRP2GenFAQ
there is a small list of some important trunk USRP2 code which is
recommended for reading in order to understand USRP2 architecture,
configuration and operation.
Quote: “In the FPGA code, the tx_control.v and rx_control.v show
inband signalling, dsp_core_rx and dsp_core_tx show the DSP, and
u2_core.v is the top level.
In the firmware, start with txrx.c.”
-WHERE CAN I FIND THESE FILES?
The UHD source-code tree includes the Verilog for the FPGA, and the C
code for the firmware for the ZPU.
-WHAT IS AND WHAT DOES THE FIRMWARE DO, IN THIS CASE?
-ISN’T THE FIRMWARE “GLUED” TOGETHER WITH FPGA IMAGE IN THE SD CARD ON
SOME WAY?
The SD card contains two distinct images that are loaded into
memory--the FPGA image, and the firmware image.
The FPGA contains a "Soft CPU" (used to be an aeMB, but is now a ZPU).
This "Soft CPU" runs firmware that manages a lot of the low-bandwidth
configuration "stuff" related to the hardware, while the
rest of the FPGA handles DSP operations, and actual high-speed "data
pumping" from/to the DSP and Ethernet.
If you run the "build-gnuradio" script described above, you'll have
source code for both UHD and Gnu Radio, and in UHD, there'll be both
"fpga" and "firmware" sub-directories.
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