#
# Copyright 2005,2006,2009 Free Software Foundation, Inc.
# 
# This file is part of GNU Radio
# 
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
# 
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING.  If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
# 

This directory (and the resulting tarball) contains a build tree with
examples, Makefiles, etc that demonstrate how to write signal
processing blocks for the GNU Radio system.  This directory is
intentionally distributed separately from the unified tarball of the
rest of GNU Radio in order to avoid problems for people who have begun
to write blocks with a modified copy of gr-logitech_27mhz_transceiver-write-a-block.

This project requires a functional GNU Radio installation including GRC 
and USRP support.

== How To Install ==

To build the examples from the tarball use the normal recipe:

  $ ./configure
  $ make
  $ sudo make install

If you're building from git, you'll need to use this sequence, since
git doesn't contain configure or the generated Makefiles.

  $ ./bootstrap
  $ ./configure
  $ make
  $ sudo make install



== How To Run ==

According to the installed GNU Radio version, the GRC projects need to be 
started by running

grc grc/receiver_27mhz.grc grc/sender_27mhz.grc

on GNU Radio 3.2.2 or 

gnuradio-companion grc/receiver_27mhz.grc grc/sender_27mhz.grc

on GNU Radio 3.3.0 both times run from project root.

 
When running the receiver, the VERBOSE mode can be enabled/disabled in the 
block "Logitech 27MHz Packet Decoder" which outputs all information gathered 
from the received signal and outputs it to the console like

_______________
DATA FRAME
KEYBOARD ID: 0x74a
KEY PRESSED: 0111001
KEY WAS PRESSED
FOUND KEY PRESSED: c 
_______________

or 

_______________
SECURED CONNECTION
KEYBOARD ID: 0xff1
1 0 1 1 1 1 1 1 0 0 0 1 0 1 1 0 
_______________


Independent from the console output, the received keystrokes are written to 
the file /tmp/rec_27mhz_keys.txt.

This file can be readout cyclic for example with the command 

tail -f -s 0.1 /tmp/rec_27mhz_keys.txt

in a Linux shell.