Editing RFID Hacking/usrp/

'''''notes about the install procedure for Gen2 RFID USRP (modified gnuradio library)'''''


This software/hardware allows the operator to read Gen2 RFIDs in the 900Mhz range.
This project has not yet been publicly distributed but the author tells us
it will be released soon. These notes are not an install recipe... rather they are
clarification to help describe the install procedure.

According to the README, this project was tested with gnuradio subversion changeset 10532...

<pre>
$ svn co -r 10532 http://gnuradio.org/svn/gnuradio/trunk gnuradio
</pre>

'''step #1'''<BR>
Copy gen2_reader/gnuradio/misc_files/grc_gr_gen2_rfid.m4 to gnuradio/config

<pre>
cp gen2_reader/gnuradio/misc_files/grc_gr_gen2_rfid.m4 gnuradio/config
</pre>

'''step #2'''

<pre>
cp -a gen2_reader/gnuradio/gr-gen2-rfid gnuradio/
</pre>

'''step #4'''<BR>
add the following to line 304ish:
GRC_GR_GEN2_RFID


----


This here are software dependencies from a different gnuradio project
so it should contain most gnuradio dependencies :
<pre>
apt-get install -y libboost-dev python python2.5-dev libfftw3-dev swig sdcc-nf libusb-dev guile-1.8-dev libcppunit-dev libosip2-dev libortp7-dev asterisk
</pre>

gnuradio dependencies:

* built/installed the latest libboost and then install libgsl :
<pre>
apt-get install libgsl0-dev
</pre>

gnuradio build:
<pre>
./configure --prefix=/usr/local/gnuradio-rfid --enable-gr-gen2-rfid --enable-gnuradio-core --enable-gr-audio-oss

make

make install
</pre>

'''step #8'''
<pre>
cp gen2_reader/gnuradio/misc_files/gen2_reader.rbf /usr/local/gnuradio-rfid/share/usrp/rev4
</pre>

'''step #9'''
<pre>
cd gnuradio/gr-gen2-rfid/src/lib
make clean
</pre>

apply this patch:

'''gnuradio/gr-gen2-rfid/src/lib/rfid_gen2_reader.cc'''
<PRE>
42,48d41
< // FIXME NB
< inline float min(float a, float b)
< {
<   return a <= b ? a : b;
< }
< 
< 
645,647c638,639
<    //FIXME NB
<     //int mm = std::min((tx_msg->length() - d_msg_count) / sizeof(gr_complex), (long unsigned int) noutput_items - nout);
<     int mm = min((tx_msg->length() - d_msg_count) / sizeof(gr_complex), (long unsigned int) noutput_items - nout);
---
>     
>     int mm = std::min((tx_msg->length() - d_msg_count) / sizeof(gr_complex), (long unsigned int) noutput_items - nout);
</PRE>

<pre>
make
make install
</pre>


----
=== And finally run the program ===

<pre>
sudo -s

PYTHONPATH=/usr/local/gnuradio-rfid/lib/python2.5/site-packages GR_SCHEDULER=STS nice -n -20 ./gen2_reader.py
</pre>