Hello. I'm trying to write a block in gnuradio for broadband reception. The main problem at the moment is to transfer data to the fft block. I'm new to python and so it's hard for me to figure this out.import numpy as np
I need an array of data to pass to the gnuradio.fft.fft.vcc block from gnuradio import gr from gnuradio import uhd from gnuradio import fft class blk(gr.sync_block): # other base classes are basic_block, decim_block, interp_block """Embedded Python Block example - a simple multiply const""" def __init__(self, gain=1.0,start_freq=70e6,stop_freq=6000e6,samp_rate=30e6): # only default arguments here """arguments to this function show up as parameters in GRC""" gr.sync_block.__init__( self, name='Python Block', # will show up in GRC in_sig=None, out_sig=[np.complex64,np.complex64] ) # if an attribute with the same name as a parameter is found, # a callback is registered (properties work, too). self.gain = gain self.start_freq=start_freq self.stop_freq=stop_freq self.samp_rate=samp_rate self.uhd_usrp_source_0 = uhd.usrp_source(",".join(("", "")), uhd.stream_args( cpu_format="fc32", otw_format="sc16", chanels=range(1), ), ) self.uhd_usrp_source_0.set_clock_rate(30e6, uhd.ALL_MBOARDS) self.uhd_usrp_source_0.set_samp_rate(self.samp_rate) self.uhd_usrp_source_0.set_gain(self.gain, 0) self.uhd_usrp_source_0.set_antenna("RX2", 0) self.uhd_usrp_source_0.set_bandwidth(30e6, 0) self.range_freq=(self.stop_freq-self.start_freq)/self.samp_rate def work(self, input_items, output_items): """example: multiply with constant""" for i in np.range(self.range_freq): self.uhd_usrp_source_0.set_center_freq(self.start_freq+self.samp_rate*i) data=np.array(self.uhd_usrp_source_0.finite_acquisition(8192)) output_items[0][:] = input_items[0] * self.example_param return len(output_items[0])
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