Setting Center Frequency

[Oğuzhan Gedikli]

Hello, everyone.

I designed both transmiter and receiver in GNU Radio. I am reading data from serial port and according to data I am printing the max value at the receiver. Now, I want to make frequency switch. For frequency switch, I wrote the code below. I have a one problem that is when I run the program, receiver and transmitter turn on and off until it finish. Every frequency switch, they turn on and off. But If I designed range block in GNU Radio and If I change the frequency manually, receiver and transmitter always run. I want to this. But my design in code make blinking in SDR and it makes overflows error.

I will be glad if you help.

    def center_freq_change(self):

        global center_freq

        global stop_freq

        path = "C:\\Users\\my\\Desktop\\ss.txt"

        while center_freq <= stop_freq:

            self.lock()

            self.blocks_file_sink_0.close()

            self.unlock()

            center_freq += diff

            self.lock()

            #self.uhd_usrp_source_0.set_center_freq(center_freq, 0)

            #self.uhd_usrp_sink_0.set_center_freq(center_freq, 0)

            tb.set_center_freq(center_freq)

            self.blocks_file_sink_0.open(path)

            self.unlock()

            time.sleep(0.02)

            f = np.fromfile(path, dtype=np.float32)

            f_max = np.max(f)

            print("Max. Value at {} Hz : {}".format(center_freq, f_max))

            if center_freq == stop_freq:

                break

        center_freq = start_freq

        self.lock()

        #self.uhd_usrp_source_0.set_center_freq(center_freq, 0)

        #self.uhd_usrp_sink_0.set_center_freq(center_freq, 0)

        tb.set_center_freq(center_freq)

        self.unlock()