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   1 #
   2 # Copyright 2008,2009 Free Software Foundation, Inc.
   3 #
   4 # This file is part of GNU Radio
   5 #
   6 # GNU Radio is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 3, or (at your option)
   9 # any later version.
  10 #
  11 # GNU Radio is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with GNU Radio; see the file COPYING.  If not, write to
  18 # the Free Software Foundation, Inc., 51 Franklin Street,
  19 # Boston, MA 02110-1301, USA.
  20 #
  21
  22 ##################################################
  23 # Imports
  24 ##################################################
  25 import fft_window
  26 import common
  27 from gnuradio import gr, blks2
  28 from pubsub import pubsub
  29 from constants import *
  30
  31 ##################################################
  32 # FFT sink block (wrapper for old wxgui)
  33 ##################################################
  34 class _fft_sink_base(gr.hier_block2, common.wxgui_hb):
  35         """
  36         An fft block with real/complex inputs and a gui window.
  37         """
  38
  39         def __init__(
  40                 self,
  41                 parent,
  42                 baseband_freq=0,
  43                 ref_scale=2.0,
  44                 y_per_div=10,
  45                 y_divs=8,
  46                 ref_level=50,
  47                 sample_rate=1,
  48                 fft_size=512,
  49                 fft_rate=fft_window.DEFAULT_FRAME_RATE,
  50                 average=False,
  51                 avg_alpha=None,
  52                 title='',
  53                 size=fft_window.DEFAULT_WIN_SIZE,
  54                 peak_hold=False,
  55                 win=None,
  56                 **kwargs #do not end with a comma
  57         ):
  58                 #ensure avg alpha
  59                 if avg_alpha is None: avg_alpha = 2.0/fft_rate
  60                 #init
  61                 gr.hier_block2.__init__(
  62                         self,
  63                         "fft_sink",
  64                         gr.io_signature(1, 1, self._item_size),
  65                         gr.io_signature(0, 0, 0),
  66                 )
  67                 #blocks
  68                 fft = self._fft_chain(
  69                         sample_rate=sample_rate,
  70                         fft_size=fft_size,
  71                         frame_rate=fft_rate,
  72                         ref_scale=ref_scale,
  73                         avg_alpha=avg_alpha,
  74                         average=average,
  75                         win=win,
  76                 )
  77                 msgq = gr.msg_queue(2)
  78                 sink = gr.message_sink(gr.sizeof_float*fft_size, msgq, True)
  79                 #controller
  80                 self.controller = pubsub()
  81                 self.controller.subscribe(AVERAGE_KEY, fft.set_average)
  82                 self.controller.publish(AVERAGE_KEY, fft.average)
  83                 self.controller.subscribe(AVG_ALPHA_KEY, fft.set_avg_alpha)
  84                 self.controller.publish(AVG_ALPHA_KEY, fft.avg_alpha)
  85                 self.controller.subscribe(SAMPLE_RATE_KEY, fft.set_sample_rate)
  86                 self.controller.publish(SAMPLE_RATE_KEY, fft.sample_rate)
  87                 #start input watcher
  88                 common.input_watcher(msgq, self.controller, MSG_KEY)
  89                 #create window
  90                 self.win = fft_window.fft_window(
  91                         parent=parent,
  92                         controller=self.controller,
  93                         size=size,
  94                         title=title,
  95                         real=self._real,
  96                         fft_size=fft_size,
  97                         baseband_freq=baseband_freq,
  98                         sample_rate_key=SAMPLE_RATE_KEY,
  99                         y_per_div=y_per_div,
 100                         y_divs=y_divs,
 101                         ref_level=ref_level,
 102                         average_key=AVERAGE_KEY,
 103                         avg_alpha_key=AVG_ALPHA_KEY,
 104                         peak_hold=peak_hold,
 105                         msg_key=MSG_KEY,
 106                 )
 107                 common.register_access_methods(self, self.win)
 108                 setattr(self.win, 'set_baseband_freq', getattr(self, 'set_baseband_freq')) #BACKWARDS
 109                 setattr(self.win, 'set_peak_hold', getattr(self, 'set_peak_hold')) #BACKWARDS
 110                 #connect
 111                 self.wxgui_connect(self, fft, sink)
 112
 113 class fft_sink_f(_fft_sink_base):
 114         _fft_chain = blks2.logpwrfft_f
 115         _item_size = gr.sizeof_float
 116         _real = True
 117
 118 class fft_sink_c(_fft_sink_base):
 119         _fft_chain = blks2.logpwrfft_c
 120         _item_size = gr.sizeof_gr_complex
 121         _real = False
 122
 123 # ----------------------------------------------------------------
 124 # Standalone test app
 125 # ----------------------------------------------------------------
 126
 127 import wx
 128 from gnuradio.wxgui import stdgui2
 129
 130 class test_app_block (stdgui2.std_top_block):
 131     def __init__(self, frame, panel, vbox, argv):
 132         stdgui2.std_top_block.__init__ (self, frame, panel, vbox, argv)
 133
 134         fft_size = 256
 135
 136         # build our flow graph
 137         input_rate = 20.48e3
 138
 139         # Generate a complex sinusoid
 140         #src1 = gr.sig_source_c (input_rate, gr.GR_SIN_WAVE, 2e3, 1)
 141         src1 = gr.sig_source_c (input_rate, gr.GR_CONST_WAVE, 5.75e3, 1)
 142
 143         # We add these throttle blocks so that this demo doesn't
 144         # suck down all the CPU available.  Normally you wouldn't use these.
 145         thr1 = gr.throttle(gr.sizeof_gr_complex, input_rate)
 146
 147         sink1 = fft_sink_c (panel, title="Complex Data", fft_size=fft_size,
 148                             sample_rate=input_rate, baseband_freq=100e3,
 149                             ref_level=0, y_per_div=20, y_divs=10)
 150         vbox.Add (sink1.win, 1, wx.EXPAND)
 151
 152         self.connect(src1, thr1, sink1)
 153
 154         #src2 = gr.sig_source_f (input_rate, gr.GR_SIN_WAVE, 2e3, 1)
 155         src2 = gr.sig_source_f (input_rate, gr.GR_CONST_WAVE, 5.75e3, 1)
 156         thr2 = gr.throttle(gr.sizeof_float, input_rate)
 157         sink2 = fft_sink_f (panel, title="Real Data", fft_size=fft_size*2,
 158                             sample_rate=input_rate, baseband_freq=100e3,
 159                             ref_level=0, y_per_div=20, y_divs=10)
 160         vbox.Add (sink2.win, 1, wx.EXPAND)
 161
 162         self.connect(src2, thr2, sink2)
 163
 164 def main ():
 165     app = stdgui2.stdapp (test_app_block, "FFT Sink Test App")
 166     app.MainLoop ()
 167
 168 if __name__ == '__main__':
 169     main ()