OsmocomBB MS-side GSM Protocol stack (L1, L2, L3) including firmware https://osmocom.org/projects/baseband
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osmocom-bb/src/target/trx_toolkit/clck_gen.py

138 lines
3.5 KiB

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# TRX Toolkit
# Simple TDMA frame clock generator
#
# (C) 2017-2019 by Vadim Yanitskiy <axilirator@gmail.com>
#
# All Rights Reserved
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
APP_CR_HOLDERS = [("2017-2019", "Vadim Yanitskiy <axilirator@gmail.com>")]
import logging as log
import threading
import signal
from app_common import ApplicationBase
from udp_link import UDPLink
from gsm_shared import *
class CLCKGen:
# GSM TDMA definitions
SEC_DELAY_US = 1000 * 1000
GSM_FRAME_US = 4615.0
# Average loop back delay
LO_DELAY_US = 90.0
def __init__(self, clck_links, clck_start = 0, ind_period = 102):
# This event is needed to control the thread
self._breaker = threading.Event()
self._thread = None
self.clck_links = clck_links
self.ind_period = ind_period
self.clck_start = clck_start
# Calculate counter time
self.ctr_interval = self.GSM_FRAME_US - self.LO_DELAY_US
self.ctr_interval /= self.SEC_DELAY_US
# (Optional) clock consumer
self.clck_handler = None
@property
def running(self):
if self._thread is None:
return False
return self._thread.is_alive()
def start(self):
# Make sure we won't start two threads
assert(self._thread is None)
# (Re)set the clock counter
self.clck_src = self.clck_start
# Initialize and start a new thread
self._thread = threading.Thread(target = self._worker)
self._thread.setDaemon(True)
self._thread.start()
def stop(self):
# No thread, no problem ;)
if self._thread is None:
return
# Stop the thread first
self._breaker.set()
self._thread.join()
# Free memory, reset breaker
del self._thread
self._thread = None
self._breaker.clear()
def _worker(self):
while not self._breaker.wait(self.ctr_interval):
self.send_clck_ind()
def send_clck_ind(self):
# We don't need to send so often
if self.clck_src % self.ind_period == 0:
# Create UDP payload
payload = "IND CLOCK %u\0" % self.clck_src
# Send indication to all UDP links
for link in self.clck_links:
link.send(payload)
# Debug print
log.debug(payload.rstrip("\0"))
if self.clck_handler is not None:
self.clck_handler(self.clck_src)
# Increase frame count (modular arithmetic)
self.clck_src = (self.clck_src + 1) % GSM_HYPERFRAME
# Just a wrapper for independent usage
class Application(ApplicationBase):
def __init__(self):
# Print copyright
self.app_print_copyright(APP_CR_HOLDERS)
# Set up signal handlers
signal.signal(signal.SIGINT, self.sig_handler)
# Configure logging
log.basicConfig(level = log.DEBUG,
format = "[%(levelname)s] TID#%(thread)s %(filename)s:%(lineno)d %(message)s")
def run(self):
self.link = UDPLink("127.0.0.1", 5800, "0.0.0.0", 5700)
self.clck = CLCKGen([self.link], ind_period = 51)
self.clck.start()
# Block unless we receive a signal
self.clck._thread.join()
def sig_handler(self, signum, frame):
log.info("Signal %d received" % signum)
if signum == signal.SIGINT:
self.clck.stop()
if __name__ == '__main__':
app = Application()
app.run()