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epy_block_0.py
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epy_block_0.py
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"""
Embedded Python Blocks:
Each time this file is saved, GRC will instantiate the first class it finds
to get ports and parameters of your block. The arguments to __init__ will
be the parameters. All of them are required to have default values!
"""
import numpy as np
from gnuradio import gr
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, vector_size=1024): # only default arguments here
"""arguments to this function show up as parameters in GRC"""
gr.sync_block.__init__(
self,
name='Subtract Constant', # will show up in GRC
in_sig=[(np.float32,vector_size)],
out_sig=[(np.float32,vector_size)]
)
# if an attribute with the same name as a parameter is found,
# a callback is registered (properties work, too).
self.vector_size = vector_size
def work(self, input_items, output_items):
"""example: multiply with constant"""
vect_min = np.amin(input_items[0])
output_items[0][:] = input_items[0][:] - vect_min
return len(output_items[0])