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Diffstat (limited to 'gr-wxgui/src/python/fftsink.py')
| -rwxr-xr-x | gr-wxgui/src/python/fftsink.py | 488 |
1 files changed, 488 insertions, 0 deletions
diff --git a/gr-wxgui/src/python/fftsink.py b/gr-wxgui/src/python/fftsink.py new file mode 100755 index 000000000..8796a1b92 --- /dev/null +++ b/gr-wxgui/src/python/fftsink.py @@ -0,0 +1,488 @@ +#!/usr/bin/env python +# +# Copyright 2003,2004,2005,2006 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., 59 Temple Place - Suite 330, +# Boston, MA 02111-1307, USA. +# + +from gnuradio import gr, gru, window +from gnuradio.wxgui import stdgui +import wx +import gnuradio.wxgui.plot as plot +import Numeric +import threading +import math + +default_fftsink_size = (640,240) +default_fft_rate = gr.prefs().get_long('wxgui', 'fft_rate', 15) + +class fft_sink_base(object): + def __init__(self, input_is_real=False, baseband_freq=0, y_per_div=10, ref_level=50, + sample_rate=1, fft_size=512, + fft_rate=default_fft_rate, + average=False, avg_alpha=None, title='', peak_hold=False): + + # initialize common attributes + self.baseband_freq = baseband_freq + self.y_divs = 8 + self.y_per_div=y_per_div + self.ref_level = ref_level + self.sample_rate = sample_rate + self.fft_size = fft_size + self.fft_rate = fft_rate + self.average = average + if avg_alpha is None: + self.avg_alpha = 2.0 / fft_rate + else: + self.avg_alpha = avg_alpha + self.title = title + self.peak_hold = peak_hold + self.input_is_real = input_is_real + self.msgq = gr.msg_queue(2) # queue that holds a maximum of 2 messages + + def set_y_per_div(self, y_per_div): + self.y_per_div = y_per_div + + def set_ref_level(self, ref_level): + self.ref_level = ref_level + + def set_average(self, average): + self.average = average + if average: + self.avg.set_taps(self.avg_alpha) + self.set_peak_hold(False) + else: + self.avg.set_taps(1.0) + + def set_peak_hold(self, enable): + self.peak_hold = enable + if enable: + self.set_average(False) + self.win.set_peak_hold(enable) + + def set_avg_alpha(self, avg_alpha): + self.avg_alpha = avg_alpha + + def set_baseband_freq(self, baseband_freq): + self.baseband_freq = baseband_freq + + def set_sample_rate(self, sample_rate): + self.sample_rate = sample_rate + self._set_n() + + def _set_n(self): + self.one_in_n.set_n(max(1, int(self.sample_rate/self.fft_size/self.fft_rate))) + + +class fft_sink_f(gr.hier_block, fft_sink_base): + def __init__(self, fg, parent, baseband_freq=0, + y_per_div=10, ref_level=50, sample_rate=1, fft_size=512, + fft_rate=default_fft_rate, average=False, avg_alpha=None, + title='', size=default_fftsink_size, peak_hold=False): + + fft_sink_base.__init__(self, input_is_real=True, baseband_freq=baseband_freq, + y_per_div=y_per_div, ref_level=ref_level, + sample_rate=sample_rate, fft_size=fft_size, + fft_rate=fft_rate, + average=average, avg_alpha=avg_alpha, title=title, + peak_hold=peak_hold) + + s2p = gr.stream_to_vector(gr.sizeof_float, self.fft_size) + self.one_in_n = gr.keep_one_in_n(gr.sizeof_float * self.fft_size, + max(1, int(self.sample_rate/self.fft_size/self.fft_rate))) + + mywindow = window.blackmanharris(self.fft_size) + fft = gr.fft_vfc(self.fft_size, True, mywindow) + power = 0 + for tap in mywindow: + power += tap*tap + + c2mag = gr.complex_to_mag(self.fft_size) + self.avg = gr.single_pole_iir_filter_ff(1.0, self.fft_size) + + # FIXME We need to add 3dB to all bins but the DC bin + log = gr.nlog10_ff(20, self.fft_size, + -20*math.log10(self.fft_size)-10*math.log10(power/self.fft_size)) + sink = gr.message_sink(gr.sizeof_float * self.fft_size, self.msgq, True) + + fg.connect (s2p, self.one_in_n, fft, c2mag, self.avg, log, sink) + gr.hier_block.__init__(self, fg, s2p, sink) + + self.win = fft_window(self, parent, size=size) + self.set_average(self.average) + + +class fft_sink_c(gr.hier_block, fft_sink_base): + def __init__(self, fg, parent, baseband_freq=0, + y_per_div=10, ref_level=50, sample_rate=1, fft_size=512, + fft_rate=default_fft_rate, average=False, avg_alpha=None, + title='', size=default_fftsink_size, peak_hold=False): + + fft_sink_base.__init__(self, input_is_real=False, baseband_freq=baseband_freq, + y_per_div=y_per_div, ref_level=ref_level, + sample_rate=sample_rate, fft_size=fft_size, + fft_rate=fft_rate, + average=average, avg_alpha=avg_alpha, title=title, + peak_hold=peak_hold) + + s2p = gr.stream_to_vector(gr.sizeof_gr_complex, self.fft_size) + self.one_in_n = gr.keep_one_in_n(gr.sizeof_gr_complex * self.fft_size, + max(1, int(self.sample_rate/self.fft_size/self.fft_rate))) + mywindow = window.blackmanharris(self.fft_size) + power = 0 + for tap in mywindow: + power += tap*tap + + fft = gr.fft_vcc(self.fft_size, True, mywindow) + c2mag = gr.complex_to_mag(fft_size) + self.avg = gr.single_pole_iir_filter_ff(1.0, fft_size) + log = gr.nlog10_ff(20, self.fft_size, + -20*math.log10(self.fft_size)-10*math.log10(power/self.fft_size)) + sink = gr.message_sink(gr.sizeof_float * fft_size, self.msgq, True) + + fg.connect(s2p, self.one_in_n, fft, c2mag, self.avg, log, sink) + gr.hier_block.__init__(self, fg, s2p, sink) + + self.win = fft_window(self, parent, size=size) + self.set_average(self.average) + + +# ------------------------------------------------------------------------ + +myDATA_EVENT = wx.NewEventType() +EVT_DATA_EVENT = wx.PyEventBinder (myDATA_EVENT, 0) + + +class DataEvent(wx.PyEvent): + def __init__(self, data): + wx.PyEvent.__init__(self) + self.SetEventType (myDATA_EVENT) + self.data = data + + def Clone (self): + self.__class__ (self.GetId()) + + +class input_watcher (threading.Thread): + def __init__ (self, msgq, fft_size, event_receiver, **kwds): + threading.Thread.__init__ (self, **kwds) + self.setDaemon (1) + self.msgq = msgq + self.fft_size = fft_size + self.event_receiver = event_receiver + self.keep_running = True + self.start () + + def run (self): + while (self.keep_running): + msg = self.msgq.delete_head() # blocking read of message queue + itemsize = int(msg.arg1()) + nitems = int(msg.arg2()) + + s = msg.to_string() # get the body of the msg as a string + + # There may be more than one FFT frame in the message. + # If so, we take only the last one + if nitems > 1: + start = itemsize * (nitems - 1) + s = s[start:start+itemsize] + + complex_data = Numeric.fromstring (s, Numeric.Float32) + de = DataEvent (complex_data) + wx.PostEvent (self.event_receiver, de) + del de + + +class fft_window (plot.PlotCanvas): + def __init__ (self, fftsink, parent, id = -1, + pos = wx.DefaultPosition, size = wx.DefaultSize, + style = wx.DEFAULT_FRAME_STYLE, name = ""): + plot.PlotCanvas.__init__ (self, parent, id, pos, size, style, name) + + self.y_range = None + self.fftsink = fftsink + self.peak_hold = False + self.peak_vals = None + + self.SetEnableGrid (True) + # self.SetEnableZoom (True) + # self.SetBackgroundColour ('black') + + self.build_popup_menu() + + EVT_DATA_EVENT (self, self.set_data) + wx.EVT_CLOSE (self, self.on_close_window) + self.Bind(wx.EVT_RIGHT_UP, self.on_right_click) + + self.input_watcher = input_watcher(fftsink.msgq, fftsink.fft_size, self) + + + def on_close_window (self, event): + print "fft_window:on_close_window" + self.keep_running = False + + + def set_data (self, evt): + dB = evt.data + L = len (dB) + + if self.peak_hold: + if self.peak_vals is None: + self.peak_vals = dB + else: + self.peak_vals = Numeric.maximum(dB, self.peak_vals) + dB = self.peak_vals + + x = max(abs(self.fftsink.sample_rate), abs(self.fftsink.baseband_freq)) + if x >= 1e9: + sf = 1e-9 + units = "GHz" + elif x >= 1e6: + sf = 1e-6 + units = "MHz" + else: + sf = 1e-3 + units = "kHz" + + if self.fftsink.input_is_real: # only plot 1/2 the points + x_vals = ((Numeric.arrayrange (L/2) + * (self.fftsink.sample_rate * sf / L)) + + self.fftsink.baseband_freq * sf) + points = Numeric.zeros((len(x_vals), 2), Numeric.Float64) + points[:,0] = x_vals + points[:,1] = dB[0:L/2] + else: + # the "negative freqs" are in the second half of the array + x_vals = ((Numeric.arrayrange (-L/2, L/2) + * (self.fftsink.sample_rate * sf / L)) + + self.fftsink.baseband_freq * sf) + points = Numeric.zeros((len(x_vals), 2), Numeric.Float64) + points[:,0] = x_vals + points[:,1] = Numeric.concatenate ((dB[L/2:], dB[0:L/2])) + + + lines = plot.PolyLine (points, colour='BLUE') + + graphics = plot.PlotGraphics ([lines], + title=self.fftsink.title, + xLabel = units, yLabel = "dB") + + self.Draw (graphics, xAxis=None, yAxis=self.y_range) + self.update_y_range () + + def set_peak_hold(self, enable): + self.peak_hold = enable + self.peak_vals = None + + def update_y_range (self): + ymax = self.fftsink.ref_level + ymin = self.fftsink.ref_level - self.fftsink.y_per_div * self.fftsink.y_divs + self.y_range = self._axisInterval ('min', ymin, ymax) + + def on_average(self, evt): + # print "on_average" + self.fftsink.set_average(evt.IsChecked()) + + def on_peak_hold(self, evt): + # print "on_peak_hold" + self.fftsink.set_peak_hold(evt.IsChecked()) + + def on_incr_ref_level(self, evt): + # print "on_incr_ref_level" + self.fftsink.set_ref_level(self.fftsink.ref_level + + self.fftsink.y_per_div) + + def on_decr_ref_level(self, evt): + # print "on_decr_ref_level" + self.fftsink.set_ref_level(self.fftsink.ref_level + - self.fftsink.y_per_div) + + def on_incr_y_per_div(self, evt): + # print "on_incr_y_per_div" + self.fftsink.set_y_per_div(next_up(self.fftsink.y_per_div, (1,2,5,10,20))) + + def on_decr_y_per_div(self, evt): + # print "on_decr_y_per_div" + self.fftsink.set_y_per_div(next_down(self.fftsink.y_per_div, (1,2,5,10,20))) + + def on_y_per_div(self, evt): + # print "on_y_per_div" + Id = evt.GetId() + if Id == self.id_y_per_div_1: + self.fftsink.set_y_per_div(1) + elif Id == self.id_y_per_div_2: + self.fftsink.set_y_per_div(2) + elif Id == self.id_y_per_div_5: + self.fftsink.set_y_per_div(5) + elif Id == self.id_y_per_div_10: + self.fftsink.set_y_per_div(10) + elif Id == self.id_y_per_div_20: + self.fftsink.set_y_per_div(20) + + + def on_right_click(self, event): + menu = self.popup_menu + for id, pred in self.checkmarks.items(): + item = menu.FindItemById(id) + item.Check(pred()) + self.PopupMenu(menu, event.GetPosition()) + + + def build_popup_menu(self): + self.id_incr_ref_level = wx.NewId() + self.id_decr_ref_level = wx.NewId() + self.id_incr_y_per_div = wx.NewId() + self.id_decr_y_per_div = wx.NewId() + self.id_y_per_div_1 = wx.NewId() + self.id_y_per_div_2 = wx.NewId() + self.id_y_per_div_5 = wx.NewId() + self.id_y_per_div_10 = wx.NewId() + self.id_y_per_div_20 = wx.NewId() + self.id_average = wx.NewId() + self.id_peak_hold = wx.NewId() + + self.Bind(wx.EVT_MENU, self.on_average, id=self.id_average) + self.Bind(wx.EVT_MENU, self.on_peak_hold, id=self.id_peak_hold) + self.Bind(wx.EVT_MENU, self.on_incr_ref_level, id=self.id_incr_ref_level) + self.Bind(wx.EVT_MENU, self.on_decr_ref_level, id=self.id_decr_ref_level) + self.Bind(wx.EVT_MENU, self.on_incr_y_per_div, id=self.id_incr_y_per_div) + self.Bind(wx.EVT_MENU, self.on_decr_y_per_div, id=self.id_decr_y_per_div) + self.Bind(wx.EVT_MENU, self.on_y_per_div, id=self.id_y_per_div_1) + self.Bind(wx.EVT_MENU, self.on_y_per_div, id=self.id_y_per_div_2) + self.Bind(wx.EVT_MENU, self.on_y_per_div, id=self.id_y_per_div_5) + self.Bind(wx.EVT_MENU, self.on_y_per_div, id=self.id_y_per_div_10) + self.Bind(wx.EVT_MENU, self.on_y_per_div, id=self.id_y_per_div_20) + + + # make a menu + menu = wx.Menu() + self.popup_menu = menu + menu.AppendCheckItem(self.id_average, "Average") + menu.AppendCheckItem(self.id_peak_hold, "Peak Hold") + menu.Append(self.id_incr_ref_level, "Incr Ref Level") + menu.Append(self.id_decr_ref_level, "Decr Ref Level") + # menu.Append(self.id_incr_y_per_div, "Incr dB/div") + # menu.Append(self.id_decr_y_per_div, "Decr dB/div") + menu.AppendSeparator() + # we'd use RadioItems for these, but they're not supported on Mac + menu.AppendCheckItem(self.id_y_per_div_1, "1 dB/div") + menu.AppendCheckItem(self.id_y_per_div_2, "2 dB/div") + menu.AppendCheckItem(self.id_y_per_div_5, "5 dB/div") + menu.AppendCheckItem(self.id_y_per_div_10, "10 dB/div") + menu.AppendCheckItem(self.id_y_per_div_20, "20 dB/div") + + self.checkmarks = { + self.id_average : lambda : self.fftsink.average, + self.id_peak_hold : lambda : self.fftsink.peak_hold, + self.id_y_per_div_1 : lambda : self.fftsink.y_per_div == 1, + self.id_y_per_div_2 : lambda : self.fftsink.y_per_div == 2, + self.id_y_per_div_5 : lambda : self.fftsink.y_per_div == 5, + self.id_y_per_div_10 : lambda : self.fftsink.y_per_div == 10, + self.id_y_per_div_20 : lambda : self.fftsink.y_per_div == 20, + } + + +def next_up(v, seq): + """ + Return the first item in seq that is > v. + """ + for s in seq: + if s > v: + return s + return v + +def next_down(v, seq): + """ + Return the last item in seq that is < v. + """ + rseq = list(seq[:]) + rseq.reverse() + + for s in rseq: + if s < v: + return s + return v + + +# ---------------------------------------------------------------- +# Deprecated interfaces +# ---------------------------------------------------------------- + +# returns (block, win). +# block requires a single input stream of float +# win is a subclass of wxWindow + +def make_fft_sink_f(fg, parent, title, fft_size, input_rate, ymin = 0, ymax=50): + + block = fft_sink_f(fg, parent, title=title, fft_size=fft_size, sample_rate=input_rate, + y_per_div=(ymax - ymin)/8, ref_level=ymax) + return (block, block.win) + +# returns (block, win). +# block requires a single input stream of gr_complex +# win is a subclass of wxWindow + +def make_fft_sink_c(fg, parent, title, fft_size, input_rate, ymin=0, ymax=50): + block = fft_sink_c(fg, parent, title=title, fft_size=fft_size, sample_rate=input_rate, + y_per_div=(ymax - ymin)/8, ref_level=ymax) + return (block, block.win) + + +# ---------------------------------------------------------------- +# Standalone test app +# ---------------------------------------------------------------- + +class test_app_flow_graph (stdgui.gui_flow_graph): + def __init__(self, frame, panel, vbox, argv): + stdgui.gui_flow_graph.__init__ (self, frame, panel, vbox, argv) + + fft_size = 256 + + # build our flow graph + input_rate = 20.48e3 + + # Generate a complex sinusoid + #src1 = gr.sig_source_c (input_rate, gr.GR_SIN_WAVE, 2e3, 1) + src1 = gr.sig_source_c (input_rate, gr.GR_CONST_WAVE, 5.75e3, 1) + + # We add these throttle blocks so that this demo doesn't + # suck down all the CPU available. Normally you wouldn't use these. + thr1 = gr.throttle(gr.sizeof_gr_complex, input_rate) + + sink1 = fft_sink_c (self, panel, title="Complex Data", fft_size=fft_size, + sample_rate=input_rate, baseband_freq=100e3, + ref_level=0, y_per_div=20) + vbox.Add (sink1.win, 1, wx.EXPAND) + self.connect (src1, thr1, sink1) + + #src2 = gr.sig_source_f (input_rate, gr.GR_SIN_WAVE, 2e3, 1) + src2 = gr.sig_source_f (input_rate, gr.GR_CONST_WAVE, 5.75e3, 1) + thr2 = gr.throttle(gr.sizeof_float, input_rate) + sink2 = fft_sink_f (self, panel, title="Real Data", fft_size=fft_size*2, + sample_rate=input_rate, baseband_freq=100e3, + ref_level=0, y_per_div=20) + vbox.Add (sink2.win, 1, wx.EXPAND) + self.connect (src2, thr2, sink2) + +def main (): + app = stdgui.stdapp (test_app_flow_graph, + "FFT Sink Test App") + app.MainLoop () + +if __name__ == '__main__': + main () |