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fm_receiver.py
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fm_receiver.py
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#!/usr/bin/env python
##################################################
# Gnuradio Python Flow Graph
# Title: Lesson 3 - FM Rx
# Author: John Malsbury - Ettus Research
# Description: Working with the USRP!
# Generated: Sat Aug 17 10:51:11 2013
##################################################
from gnuradio import audio
from gnuradio import blks2
from gnuradio import eng_notation
from gnuradio import gr
from gnuradio import uhd
from gnuradio import window
from gnuradio.eng_option import eng_option
from gnuradio.gr import firdes
from gnuradio.wxgui import fftsink2
from gnuradio.wxgui import forms
from grc_gnuradio import wxgui as grc_wxgui
from optparse import OptionParser
import wx
class fm_receiver(grc_wxgui.top_block_gui):
def __init__(self):
grc_wxgui.top_block_gui.__init__(self, title="Example bitcpf - FM Rx")
_icon_path = "/usr/share/icons/hicolor/32x32/apps/gnuradio-grc.png"
self.SetIcon(wx.Icon(_icon_path, wx.BITMAP_TYPE_ANY))
##################################################
# Variables
##################################################
self.samp_rate = samp_rate = 8e6
self.rx_gain = rx_gain = 15
self.lpf_decim = lpf_decim = 20
self.freq = freq = 106.7e6
self.audio_samp_rate = audio_samp_rate = 96e3
##################################################
# Blocks
##################################################
_rx_gain_sizer = wx.BoxSizer(wx.VERTICAL)
self._rx_gain_text_box = forms.text_box(
parent=self.GetWin(),
sizer=_rx_gain_sizer,
value=self.rx_gain,
callback=self.set_rx_gain,
label='rx_gain',
converter=forms.float_converter(),
proportion=0,
)
self._rx_gain_slider = forms.slider(
parent=self.GetWin(),
sizer=_rx_gain_sizer,
value=self.rx_gain,
callback=self.set_rx_gain,
minimum=0,
maximum=30,
num_steps=100,
style=wx.SL_HORIZONTAL,
cast=float,
proportion=1,
)
self.Add(_rx_gain_sizer)
self.notebook_0 = self.notebook_0 = wx.Notebook(self.GetWin(), style=wx.NB_TOP)
self.notebook_0.AddPage(grc_wxgui.Panel(self.notebook_0), "RF")
self.notebook_0.AddPage(grc_wxgui.Panel(self.notebook_0), "Audio")
self.Add(self.notebook_0)
self._freq_text_box = forms.text_box(
parent=self.GetWin(),
value=self.freq,
callback=self.set_freq,
label='freq',
converter=forms.float_converter(),
)
self.Add(self._freq_text_box)
self.wxgui_fftsink2_1 = fftsink2.fft_sink_f(
self.notebook_0.GetPage(1).GetWin(),
baseband_freq=0,
y_per_div=10,
y_divs=10,
ref_level=0,
ref_scale=2.0,
sample_rate=samp_rate/lpf_decim,
fft_size=1024,
fft_rate=15,
average=False,
avg_alpha=None,
title="FFT Plot",
peak_hold=False,
)
self.notebook_0.GetPage(1).Add(self.wxgui_fftsink2_1.win)
self.wxgui_fftsink2_0 = fftsink2.fft_sink_c(
self.notebook_0.GetPage(0).GetWin(),
baseband_freq=freq,
y_per_div=10,
y_divs=10,
ref_level=0,
ref_scale=2.0,
sample_rate=samp_rate,
fft_size=1024,
fft_rate=15,
average=False,
avg_alpha=None,
title="FFT Plot",
peak_hold=False,
)
self.notebook_0.GetPage(0).Add(self.wxgui_fftsink2_0.win)
self.uhd_usrp_source_0 = uhd.usrp_source(
device_addr="",
stream_args=uhd.stream_args(
cpu_format="fc32",
channels=range(1),
),
)
self.uhd_usrp_source_0.set_samp_rate(samp_rate)
self.uhd_usrp_source_0.set_center_freq(freq, 0)
self.uhd_usrp_source_0.set_gain(rx_gain, 0)
self.uhd_usrp_source_0.set_antenna("TX/RX", 0)
self.low_pass_filter_0 = gr.fir_filter_ccf(lpf_decim, firdes.low_pass(
1, samp_rate, 100e3, 10e3, firdes.WIN_HAMMING, 6.76))
self.gr_wavfile_sink_0 = gr.wavfile_sink("fm_record.wav", 1, int(audio_samp_rate), 8)
self.blks2_wfm_rcv_0 = blks2.wfm_rcv(
quad_rate=samp_rate/lpf_decim,
audio_decimation=1,
)
self.blks2_rational_resampler_xxx_0 = blks2.rational_resampler_fff(
interpolation=96,
decimation=int(samp_rate/lpf_decim/1000),
taps=None,
fractional_bw=None,
)
self.audio_sink_0 = audio.sink(int(audio_samp_rate), "", True)
##################################################
# Connections
##################################################
self.connect((self.low_pass_filter_0, 0), (self.blks2_wfm_rcv_0, 0))
self.connect((self.blks2_wfm_rcv_0, 0), (self.blks2_rational_resampler_xxx_0, 0))
self.connect((self.blks2_rational_resampler_xxx_0, 0), (self.gr_wavfile_sink_0, 0))
self.connect((self.blks2_rational_resampler_xxx_0, 0), (self.audio_sink_0, 0))
self.connect((self.blks2_wfm_rcv_0, 0), (self.wxgui_fftsink2_1, 0))
self.connect((self.uhd_usrp_source_0, 0), (self.low_pass_filter_0, 0))
self.connect((self.uhd_usrp_source_0, 0), (self.wxgui_fftsink2_0, 0))
def get_samp_rate(self):
return self.samp_rate
def set_samp_rate(self, samp_rate):
self.samp_rate = samp_rate
self.wxgui_fftsink2_0.set_sample_rate(self.samp_rate)
self.uhd_usrp_source_0.set_samp_rate(self.samp_rate)
self.low_pass_filter_0.set_taps(firdes.low_pass(1, self.samp_rate, 100e3, 10e3, firdes.WIN_HAMMING, 6.76))
self.wxgui_fftsink2_1.set_sample_rate(self.samp_rate/self.lpf_decim)
def get_rx_gain(self):
return self.rx_gain
def set_rx_gain(self, rx_gain):
self.rx_gain = rx_gain
self.uhd_usrp_source_0.set_gain(self.rx_gain, 0)
self._rx_gain_slider.set_value(self.rx_gain)
self._rx_gain_text_box.set_value(self.rx_gain)
def get_lpf_decim(self):
return self.lpf_decim
def set_lpf_decim(self, lpf_decim):
self.lpf_decim = lpf_decim
self.wxgui_fftsink2_1.set_sample_rate(self.samp_rate/self.lpf_decim)
def get_freq(self):
return self.freq
def set_freq(self, freq):
self.freq = freq
self.wxgui_fftsink2_0.set_baseband_freq(self.freq)
self.uhd_usrp_source_0.set_center_freq(self.freq, 0)
self._freq_text_box.set_value(self.freq)
def get_audio_samp_rate(self):
return self.audio_samp_rate
def set_audio_samp_rate(self, audio_samp_rate):
self.audio_samp_rate = audio_samp_rate
if __name__ == '__main__':
parser = OptionParser(option_class=eng_option, usage="%prog: [options]")
(options, args) = parser.parse_args()
tb = fm_receiver()
tb.Run(True)