#!/usr/bin/env python
#
# Copyright 2004 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 2, 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.
# 

"""
Check Rx path or USRP Rev 1.

This configures the USRP to return a periodic sequence of integers
"""

from gnuradio import gr
from gnuradio import usrp
import thread, time

def poll_thread( usrp, which ):

    def poll( usrp, which ):
        while 1:
            time.sleep( 0.01 )

            # following causes immediate usb_reap_async: timeout error
            if 0:
                reg = 4
                usrp._u._read_fpga_reg( reg )

            # following ( 0 <= which <= 3 ) -> counting errors
            if 1:
                reg = 5 + which
                usrp._u._read_fpga_reg( reg )

            # calls to the following -> NO counting errors
            if 0:
                usrp._u.set_pga( which, 0. )
                usrp._u.read_aux_adc( 0, 0 )
                usrp._u.noverruns()

    thread.start_new_thread( poll, (usrp,which) )

    
def build_graph ():
    rx_decim  = 16
    
    fg = gr.flow_graph ()
    usrp_rx = usrp.source_s (0, rx_decim, 1, 0x32103210, usrp.FPGA_MODE_COUNTING)
    sink = gr.check_counting_s ()
    fg.connect (usrp_rx, sink)

    # file_sink = gr.file_sink (gr.sizeof_short, 'counting.dat')
    # fg.connect (usrp_rx, file_sink)

    poll_thread( usrp_rx, 0 )

    return fg
    
def main ():
    fg = build_graph ()
    try:
        fg.run()
    except KeyboardInterrupt:
        pass

if __name__ == '__main__':
    main ()