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#!/usr/bin/env python
#
# Copyright 2020 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
#
from gnuradio import gr
import pmt
class var_to_msg_pair(gr.sync_block):
"""
This block has a callback that will emit a message pair with the updated variable
value when called. This is useful for monitoring a GRC variable and emitting a message
when it is changed.
"""
def __init__(self, pairname):
gr.sync_block.__init__(
self, name="var_to_msg_pair", in_sig=None, out_sig=None)
self.pairname = pairname
self.message_port_register_out(pmt.intern("msgout"))
def variable_changed(self, value):
try:
if type(value) == float:
p = pmt.from_double(value)
elif type(value) == int:
p = pmt.from_long(value)
elif type(value) == bool:
p = pmt.from_bool(value)
elif type(value) == str:
p = pmt.intern(value)
else:
p = pmt.to_pmt(value)
self.message_port_pub(pmt.intern("msgout"),
pmt.cons(pmt.intern(self.pairname), p))
except Exception as e:
gr.log.error("Unable to convert " + repr(value) +
" to PDU, no message will be emitted (reason: %s)" % repr(e))
def stop(self):
return True
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