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#!/usr/bin/env python2
# -*- coding: utf-8 -*-
# TRX Toolkit
# Simple TDMA frame clock generator
#
# (C) 2017-2018 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.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
APP_CR_HOLDERS = [("2017-2018", "Vadim Yanitskiy <axilirator@gmail.com>")]
import logging as log
import signal
from app_common import ApplicationBase
from threading import Timer
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
# State variables
timer = None
def __init__(self, clck_links, clck_start = 0, ind_period = 102):
self.clck_links = clck_links
self.ind_period = ind_period
self.clck_start = clck_start
self.clck_src = clck_start
# Calculate counter time
self.ctr_interval = self.GSM_FRAME_US - self.LO_DELAY_US
self.ctr_interval /= self.SEC_DELAY_US
self.ctr_interval *= self.ind_period
def start(self):
# Send the first indication
self.send_clck_ind()
def stop(self):
# Stop pending timer
if self.timer is not None:
self.timer.cancel()
self.timer = None
# Reset the clock source
self.clck_src = self.clck_start
def send_clck_ind(self):
# Keep clock cycle
if self.clck_src % GSM_HYPERFRAME >= 0:
self.clck_src %= GSM_HYPERFRAME
# 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"))
# Increase frame count
self.clck_src += self.ind_period
# Schedule a new indication
self.timer = Timer(self.ctr_interval, self.send_clck_ind)
self.timer.start()
# 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] %(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()
def sig_handler(self, signum, frame):
log.info("Signal %d received" % signum)
if signum is signal.SIGINT:
self.clck.stop()
if __name__ == '__main__':
app = Application()
app.run()
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