I am getting the below error when I run my code. The story is, I am trying to control the frequency sampling rate of my dial_tone python code through a AJAX for to flask server.
Update Update Update:
I was told that The request GET /valueofslider?slide_val=277 did not include a samp_rate parameter, therefore request.args.get('samp_rate') returns None. Views can't return None. That hint helped me fixed the error. The only problem left is sliding/changing values doesn't run the 'tone' sound.
Error log:
This is the Python code:
Update Update Update:
I was told that The request GET /valueofslider?slide_val=277 did not include a samp_rate parameter, therefore request.args.get('samp_rate') returns None. Views can't return None. That hint helped me fixed the error. The only problem left is sliding/changing values doesn't run the 'tone' sound.
Error log:
^Cfit-pc@fitpc-fitlet2:~$ python /home/fit-pc/my_flask_app/virtualenv/Slider/top_bloc22.py * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit) * Restarting with stat * Debugger is active! * Debugger PIN: 269-962-008 127.0.0.1 - - [24/Jul/2019 10:24:26] "GET / HTTP/1.1" 200 - None 127.0.0.1 - - [24/Jul/2019 10:24:30] "GET /valueofslider?slide_val=277 HTTP/1.1" 500 - Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/flask/app.py", line 1997, in __call__ return self.wsgi_app(environ, start_response) File "/usr/lib/python2.7/dist-packages/flask/app.py", line 1985, in wsgi_app response = self.handle_exception(e) File "/usr/lib/python2.7/dist-packages/flask/app.py", line 1540, in handle_exception reraise(exc_type, exc_value, tb) File "/usr/lib/python2.7/dist-packages/flask/app.py", line 1982, in wsgi_app response = self.full_dispatch_request() File "/usr/lib/python2.7/dist-packages/flask/app.py", line 1615, in full_dispatch_request return self.finalize_request(rv) File "/usr/lib/python2.7/dist-packages/flask/app.py", line 1630, in finalize_request response = self.make_response(rv) File "/usr/lib/python2.7/dist-packages/flask/app.py", line 1725, in make_response raise ValueError('View function did not return a response') ValueError: View function did not return a responseOnce I cancel the process on the Terminal (ctrl + c) my program will start working (which is a simple dial tone)!
This is the Python code:
#!/usr/bin/env python2 # -*- coding: utf-8 -*- ################################################## # GNU Radio Python Flow Graph # Title: Top Block 22 # Generated: Tue Jul 23 15:54:16 2019 ################################################## from gnuradio import analog from gnuradio import audio from gnuradio import blocks from gnuradio import eng_notation from gnuradio import gr from gnuradio.eng_option import eng_option from gnuradio.filter import firdes from optparse import OptionParser from flask import Flask, render_template, jsonify, request, redirect, url_for from random import randint app = Flask(__name__) class top_block_22(gr.top_block): def __init__(self): gr.top_block.__init__(self, "Top Block 22") ################################################## # Variables ################################################## self.samp_rate = samp_rate = 32000 ################################################## # Blocks ################################################## self.blocks_add_xx = blocks.add_vff(1) self.audio_sink = audio.sink(32000, '', True) self.analog_sig_source_x_1 = analog.sig_source_f(samp_rate, analog.GR_COS_WAVE, 440, 0.4, 0) self.analog_sig_source_x_0 = analog.sig_source_f(samp_rate, analog.GR_COS_WAVE, 350, 0.4, 0) self.analog_noise_source_x_0 = analog.noise_source_f(analog.GR_GAUSSIAN, 0.005, -42) ################################################## # Connections ################################################## self.connect((self.analog_noise_source_x_0, 0), (self.blocks_add_xx, 2)) self.connect((self.analog_sig_source_x_0, 0), (self.blocks_add_xx, 0)) self.connect((self.analog_sig_source_x_1, 0), (self.blocks_add_xx, 1)) self.connect((self.blocks_add_xx, 0), (self.audio_sink, 0)) @app.route('/') def hex_color(): return render_template("index.html") @app.route('/valueofslider') def slide(): samp_rate = request.args.get('samp_rate') print(samp_rate) return samp_rate def main(top_block_cls=top_block_22, options=None): tb = top_block_cls() tb.start() try: raw_input('Press Enter to quit: ') except EOFError: pass tb.stop() tb.wait() if __name__ == '__main__': app.run(debug=True) if __name__ == '__main__': main()The html code is:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>jQuery roundSlider - JS Bin</title> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script> <link href="https://cdnjs.cloudflare.com/ajax/libs/roundSlider/1.3.2/roundslider.min.css" rel="stylesheet" /> <script src="https://cdnjs.cloudflare.com/ajax/libs/roundSlider/1.3.2/roundslider.min.js"></script> </head> <body> <!-- Only html needed --> <div id="slider"></div> <script> var val; $("#slider").roundSlider({ radius: 215, min: 0, max: 40000, change: function () { var obj1 = $("#slider").data("roundSlider"); val = obj1.getValue(); value: 1 $.getJSON('/valueofslider', { slide_val: val }); } }); </script> </body>