From 23914b9cf855de8e847d450c70494626da2216e6 Mon Sep 17 00:00:00 2001
From: Vadim Yanitskiy <axilirator@gmail.com>
Date: Tue, 13 Mar 2018 01:09:56 +0700
Subject: Rename 'fake_trx' to 'trx_toolkit'

This toolkit has branched out into several different tools for
TRX interface hacking, and creating a virtual Um-interface
(FakeTRX) is only one of its potential applications.

Change-Id: I56bcbc76b9c273d6b469a2bb68ddc46f3980e835
---
 src/target/trx_toolkit/clck_gen.py | 116 +++++++++++++++++++++++++++++++++++++
 1 file changed, 116 insertions(+)
 create mode 100755 src/target/trx_toolkit/clck_gen.py

(limited to 'src/target/trx_toolkit/clck_gen.py')

diff --git a/src/target/trx_toolkit/clck_gen.py b/src/target/trx_toolkit/clck_gen.py
new file mode 100755
index 00000000..4b86c31a
--- /dev/null
+++ b/src/target/trx_toolkit/clck_gen.py
@@ -0,0 +1,116 @@
+#!/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.
+
+from copyright import print_copyright
+CR_HOLDERS = [("2017-2018", "Vadim Yanitskiy <axilirator@gmail.com>")]
+
+import signal
+import time
+import sys
+
+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
+			print("[T] %s" % payload)
+
+		# 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:
+	def __init__(self):
+		# Print copyright
+		print_copyright(CR_HOLDERS)
+
+		# Set up signal handlers
+		signal.signal(signal.SIGINT, self.sig_handler)
+
+	def run(self):
+		self.link = UDPLink("127.0.0.1", 5800, 5700)
+		self.clck = CLCKGen([self.link], ind_period = 51)
+		self.clck.start()
+
+	def sig_handler(self, signum, frame):
+		print("Signal %d received" % signum)
+		if signum is signal.SIGINT:
+			self.clck.stop()
+
+if __name__ == '__main__':
+	app = Application()
+	app.run()
-- 
cgit v1.2.3