Hi -
I have a USRP with 2 RFX2400 daughter cards and need to calibrate the
local oscillator (LO) offset between them. To do this I want to
modify the multi_scope.py example to allow me to reconfigure the flow
graph without stopping. This is based on some external measurement I
will do followed by a keypress and possibly an input using raw_input().
After studying the example Python code fragment taken from the
"Controlling flow graphs" section of
<http://gnuradio.org/trac/wiki/Tutorials/WritePythonApplications>http://gnuradio.org/trac/wiki/Tutorials/WritePythonApplications
I was able to run the code below.
#!/usr/bin/env python
from gnuradio import gr
from gnuradio import audio
import time
class my_top_block(gr.top_block):
def __init__(self):
gr.top_block.__init__(self)
sampling_freq = 48000
ampl = 0.1
self.src0 = gr.sig_source_f(sampling_freq, gr.GR_SIN_WAVE, 350, ampl)
self.src1 = gr.sig_source_f(sampling_freq, gr.GR_SIN_WAVE, 440, ampl)
self.adder = gr.add_ff()
self.sink = audio.sink(sampling_freq)
self.amp = gr.multiply_const_ff(1) # Define multiplier block
self.connect(self.src0, (self.adder, 0))
self.connect(self.src1, (self.adder, 1))
self.connect(self.adder, self.amp, self.sink) # Connect all blocks
def set_volume(self, volume):
self.amp.set_k(volume)
print "volume changed to", volume
if __name__ == '__main__':
app = my_top_block()
app.start()
raw_input ('Press Enter to change volume: ')
app.set_volume(2) # Pump up the volume (by factor 2)
raw_input ('Press Enter to stop: ')
app.stop()
#### end of simple code ###
I need help because the statements in the multi_scope.py script are
more complicated. They are:
def main ():
app = stdgui2.stdapp(my_top_block, "Multi Scope", nstatus=1)
app.MainLoop()
if __name__ == '__main__':
main ()
How can I run the scope app with a keypress and possibly an input
using raw_input()?
Thank you in advance for your help.
- Larry Wagner
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