Re: [Discuss-gnuradio] Modifying the Python code

[Derek Kozel]

Hi Rensi,

You need to add an Embedded Python block to your flowgraph. That will allow you to add whatever DSP code you want (such as squaring the signal) and anything else (like printing it). Extracting data out of the block based data flow is generally not the recommended way of handling data. You could use the ZMQ blocks and write your own ZMQ client to receive and process the data in a separate program.

Derek

On Tue, Feb 5, 2019 at 8:06 AM Rensi Mathew <address@hidden> wrote:

I have created a simple grc with source->throttle ->FFT sink/File sink


the corresponding python file is:-

#!/usr/bin/env python2
# -*- coding: utf-8 -*-
##################################################
# GNU Radio Python Flow Graph
# Title: Rsm 01 02 2019
# Generated: Fri Feb 1 16:54:42 2019
##################################################

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 gnuradio import analog
from gnuradio import blocks
from gnuradio import eng_notation
from gnuradio import gr
from gnuradio import wxgui
from gnuradio.eng_option import eng_option
from gnuradio.fft import window
from gnuradio.filter import firdes
from gnuradio.wxgui import fftsink2
from grc_gnuradio import wxgui as grc_wxgui
from optparse import OptionParser
import wx


class RSM_01_02_2019(grc_wxgui.top_block_gui):

def __init__(self):
grc_wxgui.top_block_gui.__init__(self, title="Rsm 01 02 2019")
_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 = 32000

##################################################
# Blocks
##################################################
self.wxgui_fftsink2_0 = fftsink2.fft_sink_c(
self.GetWin(),
baseband_freq=0,
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.Add(self.wxgui_fftsink2_0.win)
self.blocks_throttle_0 = blocks.throttle(gr.sizeof_gr_complex*1, samp_rate,True)
self.blocks_file_sink_0 = blocks.file_sink(gr.sizeof_gr_complex*1, "RSM.bin", False)
self.blocks_file_sink_0.set_unbuffered(False)
self.analog_sig_source_x_0 = analog.sig_source_c(samp_rate, analog.GR_COS_WAVE, 1000, 1, 0)

##################################################
# Connections
##################################################
self.connect((self.analog_sig_source_x_0, 0), (self.blocks_throttle_0, 0))
self.connect((self.blocks_throttle_0, 0), (self.blocks_file_sink_0, 0))
self.connect((self.blocks_throttle_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.analog_sig_source_x_0.set_sampling_freq(self. samp_rate)
self.wxgui_fftsink2_0.set_sample_rate(self.samp_ra te)
self.blocks_throttle_0.set_sample_rate(self.samp_r ate)




def main(top_block_cls=RSM_01_02_2019, options=None):

tb = top_block_cls()


tb.Start(True)
tb.Wait()


if __name__ == '__main__':
try:
RSM_01_02_2019().run()
except [[KeyboardInterrupt]]:
pass

Now I want to modify the python file to find the square of the value of the signal source, (which is a block in grc) and print it. (i don't want to add a block in grc but processing further in python)

How can I do it?

Kindly help
Rensi

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