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FBQ_xcvr_msg_formatter_0_0.py
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FBQ_xcvr_msg_formatter_0_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
import pmt
class blk(gr.sync_block): # other base classes are basic_block, decim_block, interp_block
"""Message gate. This module either transfer messages reads a message from the input port and
applies a python expression on it before sending it along on the output port
Parameters:
expr: String. The expression to apply. May use variables."""
def __init__(self, variables=None): # only default arguments here
"""arguments to this function show up as parameters in GRC"""
gr.sync_block.__init__(
self,
name='Message formatter', # will show up in GRC
in_sig=None,
out_sig=None
)
self.message_port_register_in(pmt.intern('msg_in'))
self.message_port_register_out(pmt.intern('msg_out'))
self.set_msg_handler(pmt.intern('msg_in'), self.handle_msg)
self._variables=variables
# if an attribute with the same name as a parameter is found,
# a callback is registered (properties work, too).
@property
def variables(self):
"""The gate control parameter tells whether messages are to be transferred or not"""
return self._variables
@variables.setter
def variables(self, value):
self._variables = value
print("Variables set to", self._variables)
@variables.deleter
def variables(self):
del self._variables
def handle_msg(self, msg):
new_value = pmt.to_python(pmt.cdr(msg)) % self._variables
p = pmt.to_pmt(new_value)
self.message_port_pub(pmt.intern("msg_out"), pmt.cons(pmt.intern("msg"), p))