[Discuss-gnuradio] Modifying the Python code

[Rensi Mathew]

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