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#
# Copyright 2008 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.
#
##################################################
# Imports
##################################################
import scope_window
import common
from gnuradio import gr
from pubsub import pubsub
from constants import *
import math
class ac_couple_block(gr.hier_block2):
"""
AC couple the incoming stream by subtracting out the low pass signal.
Mute the low pass filter to disable ac coupling.
"""
def __init__(self, controller, ac_couple_key, sample_rate_key):
gr.hier_block2.__init__(
self,
"ac_couple",
gr.io_signature(1, 1, gr.sizeof_float),
gr.io_signature(1, 1, gr.sizeof_float),
)
#blocks
lpf = gr.single_pole_iir_filter_ff(0.0)
sub = gr.sub_ff()
mute = gr.mute_ff()
#connect
self.connect(self, sub, self)
self.connect(self, lpf, mute, (sub, 1))
#subscribe
controller.subscribe(ac_couple_key, lambda x: mute.set_mute(not x))
controller.subscribe(sample_rate_key, lambda x: lpf.set_taps(0.05))
#initialize
controller[ac_couple_key] = controller[ac_couple_key]
controller[sample_rate_key] = controller[sample_rate_key]
##################################################
# Scope sink block (wrapper for old wxgui)
##################################################
class _scope_sink_base(gr.hier_block2, common.wxgui_hb):
"""
A scope block with a gui window.
"""
def __init__(
self,
parent,
title='',
sample_rate=1,
size=scope_window.DEFAULT_WIN_SIZE,
v_scale=0,
t_scale=0,
xy_mode=False,
ac_couple=False,
num_inputs=1,
frame_rate=scope_window.DEFAULT_FRAME_RATE,
emulate_analog=False,
analog_alpha=None,
**kwargs #do not end with a comma
):
#ensure analog alpha
if analog_alpha is None:
actual_frame_rate=float(frame_rate)
analog_cutoff_freq=0.5 # Hertz
#calculate alpha from wanted cutoff freq
analog_alpha = 1.0 - math.exp(-2.0*math.pi*analog_cutoff_freq/actual_frame_rate)
if not t_scale: t_scale = 10.0/sample_rate
#init
gr.hier_block2.__init__(
self,
"scope_sink",
gr.io_signature(num_inputs, num_inputs, self._item_size),
gr.io_signature(0, 0, 0),
)
#scope
msgq = gr.msg_queue(2)
scope = gr.oscope_sink_f(sample_rate, msgq)
#controller
self.controller = pubsub()
self.controller.subscribe(SAMPLE_RATE_KEY, scope.set_sample_rate)
self.controller.publish(SAMPLE_RATE_KEY, scope.sample_rate)
self.controller.subscribe(DECIMATION_KEY, scope.set_decimation_count)
self.controller.publish(DECIMATION_KEY, scope.get_decimation_count)
self.controller.subscribe(TRIGGER_LEVEL_KEY, scope.set_trigger_level)
self.controller.publish(TRIGGER_LEVEL_KEY, scope.get_trigger_level)
self.controller.subscribe(TRIGGER_MODE_KEY, scope.set_trigger_mode)
self.controller.publish(TRIGGER_MODE_KEY, scope.get_trigger_mode)
self.controller.subscribe(TRIGGER_SLOPE_KEY, scope.set_trigger_slope)
self.controller.publish(TRIGGER_SLOPE_KEY, scope.get_trigger_slope)
self.controller.subscribe(TRIGGER_CHANNEL_KEY, scope.set_trigger_channel)
self.controller.publish(TRIGGER_CHANNEL_KEY, scope.get_trigger_channel)
actual_num_inputs = self._real and num_inputs or num_inputs*2
#init ac couple
for i in range(actual_num_inputs):
self.controller[common.index_key(AC_COUPLE_KEY, i)] = ac_couple
#start input watcher
common.input_watcher(msgq, self.controller, MSG_KEY)
#create window
self.win = scope_window.scope_window(
parent=parent,
controller=self.controller,
size=size,
title=title,
frame_rate=frame_rate,
num_inputs=actual_num_inputs,
sample_rate_key=SAMPLE_RATE_KEY,
t_scale=t_scale,
v_scale=v_scale,
xy_mode=xy_mode,
ac_couple_key=AC_COUPLE_KEY,
trigger_level_key=TRIGGER_LEVEL_KEY,
trigger_mode_key=TRIGGER_MODE_KEY,
trigger_slope_key=TRIGGER_SLOPE_KEY,
trigger_channel_key=TRIGGER_CHANNEL_KEY,
decimation_key=DECIMATION_KEY,
msg_key=MSG_KEY,
emulate_analog=emulate_analog,
analog_alpha=analog_alpha,
)
common.register_access_methods(self, self.win)
#connect
if self._real:
for i in range(num_inputs):
self.wxgui_connect(
(self, i),
ac_couple_block(self.controller, common.index_key(AC_COUPLE_KEY, i), SAMPLE_RATE_KEY),
(scope, i),
)
else:
for i in range(num_inputs):
c2f = gr.complex_to_float()
self.wxgui_connect((self, i), c2f)
for j in range(2):
self.connect(
(c2f, j),
ac_couple_block(self.controller, common.index_key(AC_COUPLE_KEY, 2*i+j), SAMPLE_RATE_KEY),
(scope, 2*i+j),
)
class scope_sink_f(_scope_sink_base):
_item_size = gr.sizeof_float
_real = True
class scope_sink_c(_scope_sink_base):
_item_size = gr.sizeof_gr_complex
_real = False
# ----------------------------------------------------------------
# Stand-alone test application
# ----------------------------------------------------------------
import wx
from gnuradio.wxgui import stdgui2
class test_top_block (stdgui2.std_top_block):
def __init__(self, frame, panel, vbox, argv):
stdgui2.std_top_block.__init__ (self, frame, panel, vbox, argv)
default_input_rate = 1e6
if len(argv) > 1:
input_rate = int(argv[1])
else:
input_rate = default_input_rate
if len(argv) > 2:
v_scale = float(argv[2]) # start up at this v_scale value
else:
v_scale = None # start up in autorange mode, default
if len(argv) > 3:
t_scale = float(argv[3]) # start up at this t_scale value
else:
t_scale = .00003*default_input_rate/input_rate # old behavior
print "input rate %s v_scale %s t_scale %s" % (input_rate,v_scale,t_scale)
# Generate a complex sinusoid
ampl=1.0e3
self.src0 = gr.sig_source_c (input_rate, gr.GR_SIN_WAVE, 25.1e3*input_rate/default_input_rate, ampl)
self.noise =gr.sig_source_c (input_rate, gr.GR_SIN_WAVE, 11.1*25.1e3*input_rate/default_input_rate, ampl/10)
#self.noise =gr.noise_source_c(gr.GR_GAUSSIAN, ampl/10)
self.combine=gr.add_cc()
# We add this throttle block so that this demo doesn't suck down
# all the CPU available. You normally wouldn't use it...
self.thr = gr.throttle(gr.sizeof_gr_complex, input_rate)
scope = scope_sink_c (panel,"Secret Data",sample_rate=input_rate,
v_scale=v_scale, t_scale=t_scale)
vbox.Add (scope.win, 1, wx.EXPAND)
# Ultimately this will be
# self.connect("src0 throttle scope")
self.connect(self.src0,(self.combine,0))
self.connect(self.noise,(self.combine,1))
self.connect(self.combine, self.thr, scope)
def main ():
app = stdgui2.stdapp (test_top_block, "O'Scope Test App")
app.MainLoop ()
if __name__ == '__main__':
main ()
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