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Python Files Generated by GRC

Jia-YinApril 25, 2024About 3 mincoursecomm

A Simple GNU Radio System Architecture

Python Files Generated by GRC

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

#
# SPDX-License-Identifier: GPL-3.0
#
# GNU Radio Python Flow Graph
# Title: Not titled yet
# Author: jyw
# GNU Radio version: 3.10.1.1

from packaging.version import Version as StrictVersion

if __name__ == '__main__':
    import ctypes
    import sys
    if sys.platform.startswith('linux'):
        try:
            x11 = ctypes.cdll.LoadLibrary('libX11.so')
            x11.XInitThreads()
        except:
            print("Warning: failed to XInitThreads()")

from PyQt5 import Qt
from gnuradio import qtgui
from gnuradio.filter import firdes
import sip
from gnuradio import analog
from gnuradio import blocks
from gnuradio import gr
from gnuradio.fft import window
import sys
import signal
from argparse import ArgumentParser
from gnuradio.eng_arg import eng_float, intx
from gnuradio import eng_notation



from gnuradio import qtgui

class basic(gr.top_block, Qt.QWidget):

    def __init__(self):
        gr.top_block.__init__(self, "Not titled yet", catch_exceptions=True)
        Qt.QWidget.__init__(self)
        self.setWindowTitle("Not titled yet")
        qtgui.util.check_set_qss()
        try:
            self.setWindowIcon(Qt.QIcon.fromTheme('gnuradio-grc'))
        except:
            pass
        self.top_scroll_layout = Qt.QVBoxLayout()
        self.setLayout(self.top_scroll_layout)
        self.top_scroll = Qt.QScrollArea()
        self.top_scroll.setFrameStyle(Qt.QFrame.NoFrame)
        self.top_scroll_layout.addWidget(self.top_scroll)
        self.top_scroll.setWidgetResizable(True)
        self.top_widget = Qt.QWidget()
        self.top_scroll.setWidget(self.top_widget)
        self.top_layout = Qt.QVBoxLayout(self.top_widget)
        self.top_grid_layout = Qt.QGridLayout()
        self.top_layout.addLayout(self.top_grid_layout)

        self.settings = Qt.QSettings("GNU Radio", "basic")

        try:
            if StrictVersion(Qt.qVersion()) < StrictVersion("5.0.0"):
                self.restoreGeometry(self.settings.value("geometry").toByteArray())
            else:
                self.restoreGeometry(self.settings.value("geometry"))
        except:
            pass

        ##################################################
        # Variables
        ##################################################
        self.samp_rate = samp_rate = 32000

        ##################################################
        # Blocks
        ##################################################
        self.qtgui_freq_sink_x_0 = qtgui.freq_sink_c(
            1024, #size
            window.WIN_BLACKMAN_hARRIS, #wintype
            0, #fc
            samp_rate, #bw
            "", #name
            1,
            None # parent
        )
        self.qtgui_freq_sink_x_0.set_update_time(0.10)
        self.qtgui_freq_sink_x_0.set_y_axis(-140, 10)
        self.qtgui_freq_sink_x_0.set_y_label('Relative Gain', 'dB')
        self.qtgui_freq_sink_x_0.set_trigger_mode(qtgui.TRIG_MODE_FREE, 0.0, 0, "")
        self.qtgui_freq_sink_x_0.enable_autoscale(False)
        self.qtgui_freq_sink_x_0.enable_grid(False)
        self.qtgui_freq_sink_x_0.set_fft_average(1.0)
        self.qtgui_freq_sink_x_0.enable_axis_labels(True)
        self.qtgui_freq_sink_x_0.enable_control_panel(False)
        self.qtgui_freq_sink_x_0.set_fft_window_normalized(False)



        labels = ['', '', '', '', '',
            '', '', '', '', '']
        widths = [1, 1, 1, 1, 1,
            1, 1, 1, 1, 1]
        colors = ["blue", "red", "green", "black", "cyan",
            "magenta", "yellow", "dark red", "dark green", "dark blue"]
        alphas = [1.0, 1.0, 1.0, 1.0, 1.0,
            1.0, 1.0, 1.0, 1.0, 1.0]

        for i in range(1):
            if len(labels[i]) == 0:
                self.qtgui_freq_sink_x_0.set_line_label(i, "Data {0}".format(i))
            else:
                self.qtgui_freq_sink_x_0.set_line_label(i, labels[i])
            self.qtgui_freq_sink_x_0.set_line_width(i, widths[i])
            self.qtgui_freq_sink_x_0.set_line_color(i, colors[i])
            self.qtgui_freq_sink_x_0.set_line_alpha(i, alphas[i])

        self._qtgui_freq_sink_x_0_win = sip.wrapinstance(self.qtgui_freq_sink_x_0.qwidget(), Qt.QWidget)
        self.top_layout.addWidget(self._qtgui_freq_sink_x_0_win)
        self.blocks_throttle_0 = blocks.throttle(gr.sizeof_gr_complex*1, samp_rate,True)
        self.analog_sig_source_x_0 = analog.sig_source_c(samp_rate, analog.GR_COS_WAVE, 1000, 1, 0, 0)


        ##################################################
        # Connections
        ##################################################
        self.connect((self.analog_sig_source_x_0, 0), (self.blocks_throttle_0, 0))
        self.connect((self.blocks_throttle_0, 0), (self.qtgui_freq_sink_x_0, 0))


    def closeEvent(self, event):
        self.settings = Qt.QSettings("GNU Radio", "basic")
        self.settings.setValue("geometry", self.saveGeometry())
        self.stop()
        self.wait()

        event.accept()

    def get_samp_rate(self):
        return self.samp_rate

    def set_samp_rate(self, samp_rate):
        self.samp_rate = samp_rate
        self.analog_sig_source_x_0.set_sampling_freq(self.samp_rate)
        self.blocks_throttle_0.set_sample_rate(self.samp_rate)
        self.qtgui_freq_sink_x_0.set_frequency_range(0, self.samp_rate)




def main(top_block_cls=basic, options=None):

    if StrictVersion("4.5.0") <= StrictVersion(Qt.qVersion()) < StrictVersion("5.0.0"):
        style = gr.prefs().get_string('qtgui', 'style', 'raster')
        Qt.QApplication.setGraphicsSystem(style)
    qapp = Qt.QApplication(sys.argv)

    tb = top_block_cls()

    tb.start()

    tb.show()

    def sig_handler(sig=None, frame=None):
        tb.stop()
        tb.wait()

        Qt.QApplication.quit()

    signal.signal(signal.SIGINT, sig_handler)
    signal.signal(signal.SIGTERM, sig_handler)

    timer = Qt.QTimer()
    timer.start(500)
    timer.timeout.connect(lambda: None)

    qapp.exec_()

if __name__ == '__main__':
    main()

Program Architecture

The above program is a Python program constructed using GNU Radio and PyQt5. It is mainly used to create a simple system that can generate a sine wave signal and analyze its frequency. The table below outlines the main blocks of the program and their descriptions:

BlockDescription
Import DependenciesImport necessary packages such as PyQt5 for GUI and gnuradio for signal processing
Environment SetupCheck and set up the runtime environment, check if loading X11 library is required; set the system signal handling method
Class DefinitionDefine the basic class, which is the main class of the system integrating GUI interface and signal processing flow
Signal Processing ModulesInclude signal source, throttle block, and frequency display
Signal ConnectionsConnect the signal source to the throttle block, then output to the frequency display to show the signal frequency distribution
GUI ConfigurationSet window attributes, layout, and parameters of signal processing modules
Main FunctionInitialize an instance of the basic class, start signal processing and GUI interface
ExecutionEntry point of the program to ensure the program runs in the main mode

Detailed Explanation

  1. Import Dependencies: The program starts by importing multiple packages, such as PyQt5 for GUI and gnuradio modules for signal processing.

  2. Environment Setup:

    • Check if the platform is Linux, and if so, invoke the libX11.so library to ensure the X11 graphical interface can run correctly.
    • Set up the system signal handling to close the program when interrupt or termination signals are received.

  3. Class Definition:

    • Define a class named basic, inheriting from gr.top_block and Qt.QWidget. This class is used to set up the application's GUI interface and signal processing flow.
    • In the class's initialization method, set window attributes, layout, and signal processing modules including signal source analog_sig_source_x_0, throttle block blocks_throttle_0, and frequency display qtgui_freq_sink_x_0.

  4. Signal Processing Modules:

    • analog_sig_source_x_0: Generates a cosine wave signal with a fixed frequency.
    • blocks_throttle_0: Controls the rate of signal flow to prevent excessive CPU resource consumption.
    • qtgui_freq_sink_x_0: Displays the frequency distribution of the signal.

  5. Signal Connections:

    • Connect the signal source to the throttle block, then output to the frequency display to show the signal's frequency distribution.

  6. GUI Configuration:

    • Set parameters of the signal source, such as sampling rate and frequency.
    • Manage the layout of the application window and user interface settings.

  7. Main Function:

    • Check the Qt version, set the graphics system.
    • Create an instance of the basic class, set up system signal processing, and display the application.
    • Handle system signals and timer events to properly close and start the program.

  8. Execution:

    • The bottom part of the program serves as the entry point to ensure the program runs the main function.

Exercise 1

Try running the generated Python program file in the GNU Radio Python environment, and you should obtain the same results as in GRC.

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