Hello
In an effort to understand the GNU python programming instance, I am
trying to
create an instance of the flow graph in the dial_tone example (codeA)
just to make
sure I understand how instancing works.
I did this below in ,'mycodeA, but the program did not work.
What am I missing?
This was done in the FM receiver example, i just listed it below(codeB)
as a quick reference.
codeA-------------------------------------------------------------------------
def build_graph ():
sampling_freq = 32000
ampl = 0.1
fg = gr.flow_graph ()
src0 = gr.sig_source_f (sampling_freq, gr.GR_SIN_WAVE, 350, ampl)
src1 = gr.sig_source_f (sampling_freq, gr.GR_SIN_WAVE, 440, ampl)
dst = audio.sink (sampling_freq)
fg.connect (src0, (dst, 0))
fg.connect (src1, (dst, 1))
mycodeA-----------------------------------------------------------------------------------------------------------------
def build_graph ():
sampling_freq = 32000
ampl = 0.1
gr.flow_graph (self)
src0 = gr.sig_source_f (sampling_freq, gr.GR_SIN_WAVE, 350, ampl)
src1 = gr.sig_source_f (sampling_freq, gr.GR_SIN_WAVE, 440, ampl)
dst = audio.sink (sampling_freq)
self.connect (src0, (dst, 0))
self.connect (src1, (dst, 1))
codeB---------------------------------------------------------------------------------------------------------------------
class wfm_rx_graph (stdgui.gui_flow_graph):
def init(self,frame,panel,vbox,argv):
stdgui.gui_flow_graph.init (self,frame,panel,vbox,argv)
IF_freq = parseargs(argv[1:])
adc_rate = 64e6
decim = 250
quad_rate = adc_rate / decim # 256 kHz
audio_decimation = 8
audio_rate = quad_rate / audio_decimation # 32 kHz
# usrp is data source
src = usrp.source_c (0, decim)
src.set_rx_freq (0, IF_freq)
src.set_pga(0,20)
guts = blks.wfm_rcv (self, quad_rate, audio_decimation)
# sound card as final sink
audio_sink = audio.sink (int (audio_rate))
# now wire it all together
self.connect (src, guts)
self.connect (guts, (audio_sink, 0)