Hi All, I'm learning about GnuRadio and Python, and now I try to code my own block. The first iteration of the dialtone example works. now I want to vary the frequency in steps. after an evening of trying and googling I'm a bit lost. hopefully someone more experienced would be so kind as to check my code and/or the example provided. I follow this example snippet in http://gnuradio.org/redmine/projects/gnuradio/wiki... 1 class my_top_block(gr.top_block): 2 def __init__(self): 3 gr.top_block.__init__(self) 4 ... # Define some blocks 5 self.amp = gr.multiply_const_ff(1) # Define multiplier block 6 ... # Define more blocks 7 8 self.connect(..., self.amp, ...) # Connect all blocks 9 10 def set_volume(self, volume): 11 self.amp.set_k(volume) 12 13 if __name__ == '__main__': 14 my_top_block().start() 15 sleep(2) # Wait 2 secs (assuming sleep was imported!) 16 my_top_block.set_volume(2) # Pump up the volume (by factor 2) 17 sleep(2) # Wait 2 secs (assuming sleep was imported!) 18 my_top_block().stop() the problem is in referencing the amp block in the way shown above. In my case I need to access a signal source src0 in the same way. this is my code. #!/usr/bin/env python from gnuradio import gr from gnuradio import audio import time class RvA_top_block(gr.top_block): def __init__(self): gr.top_block.__init__(self) sample_raate = 44100 ampl = 0.1 self.src0 = gr.sig_source_f (sample_raate,gr.GR_SIN_WAVE, 350, ampl) self.src1 = gr.sig_source_f (sample_raate,gr.GR_SIN_WAVE, 440, ampl) self.dst = audio.sink(sample_raate, "") self.connect (self.src0, (self.dst,0)) self.connect (self.src1, (self.dst,1)) def setfreq(self,fq): self.scr0.set_frequency(fq) def getfreq(self): return self.scr0.frequency() if __name__ == '__main__': try: i = 350.0 while ( i < 1000 ): RvA_top_block().start() time.sleep(2) print i i = i * 1.2 RvA_top_block().stop() RvA_top_block().wait() RvA_top_block().setfreq(i) except [[KeyboardInterrupt]]: pass the result is however a complaint that Traceback (most recent call last): File "./test.py", line 35, in <module> RvA_top_block().setfreq(i) File "./test.py", line 20, in setfreq self.scr0.set_frequency(fq) File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/top_block.py", line 94, in __getattr__ return getattr(self._tb, name) AttributeError: 'gr_top_block_sptr' object has no attribute 'scr0' any help is greatly appreciated. I'm curious what the difference would be between the example "amp" and my "src0". I must be stupid, but 'im not seeing it. all this runs on an plain ubuntu. other examples work nicely and the install went smoothly. I took the most current version og gnuradio and companion about 2 weeks ago.
on 2013-02-07 23:09