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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