replaced by trunking.py
git-svn-id: http://op25.osmocom.org/svn/trunk@328 65a5c917-d112-43f1-993d-58c26a4786be
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# P25 TSBK and MBT message decoder (C) Copyright 2013 KA1RBI
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#
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# This file is part of OP25
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#
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# OP25 is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3, or (at your option)
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# any later version.
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#
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# OP25 is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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# License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with OP25; see the file COPYING. If not, write to the Free
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# Software Foundation, Inc., 51 Franklin Street, Boston, MA
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# 02110-1301, USA.
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def crc16(dat,len): # slow version
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poly = (1<<12) + (1<<5) + (1<<0)
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crc = 0
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for i in range(len):
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bits = (dat >> (((len-1)-i)*8)) & 0xff
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for j in range(8):
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bit = (bits >> (7-j)) & 1
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crc = ((crc << 1) | bit) & 0x1ffff
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if crc & 0x10000:
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crc = (crc & 0xffff) ^ poly
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crc = crc ^ 0xffff
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return crc
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class tsbk (object):
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def __init__(self, debug=0):
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self.debug = debug
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self.freq_table = {}
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self.stats = {}
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self.stats['tsbks'] = 0
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self.stats['crc'] = 0
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def format_channel_id(self, id):
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table = (id >> 12) & 0xf
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channel = id & 0xfff
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if table not in self.freq_table:
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return "%x-%d" % (table, channel)
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return "%f" % (self.freq_table[table]['frequency'] + self.freq_table[table]['step'] * channel)
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def decode_mbt_data(self, opcode, header, mbt_data):
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# print "decode_mbt_data: %x %x" %(opcode, mbt_data)
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if opcode == 0x0: # grp voice channel grant
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ch1 = (mbt_data >> 32) & 0xffff
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ch2 = (mbt_data >> 16) & 0xffff
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ga = (mbt_data ) & 0xffff
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print "mbt00 voice grant ch1 %x ch2 %x addr 0x%x" %(ch1, ch2, ga)
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elif opcode == 0x3c: # adjacent status
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rfid = (header >> 24) & 0xff
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stid = (header >> 16) & 0xff
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ch1 = (mbt_data >> 48) & 0xffff
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ch2 = (mbt_data >> 32) & 0xffff
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print "mbt3c adjacent rfid %x stid %x ch1 %x ch2 %x" %(rfid, stid, ch1, ch2)
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elif opcode == 0x3b: # network status
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wacn = (mbt_data >> 44) & 0xfffff
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ch1 = (mbt_data >> 24) & 0xffff
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ch2 = (mbt_data >> 8) & 0xffff
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print "mbt3b net stat wacn %x ch1 %x ch2 %x" %(wacn, ch1, ch2)
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elif opcode == 0x3a: # rfss status
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rfid = (mbt_data >> 56) & 0xff
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stid = (mbt_data >> 48) & 0xff
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ch1 = (mbt_data >> 32) & 0xffff
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ch2 = (mbt_data >> 16) & 0xffff
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print "mbt3a rfss stat rfid %x stid %x ch1 %x ch2 %x" %(rfid, stid, ch1, ch2)
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#else:
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# print "mbt other %x" % opcode
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def decode_tsbk(self, tsbk):
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self.stats['tsbks'] += 1
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if crc16(tsbk, 12) != 0:
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self.stats['crc'] += 1
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return # crc check failed
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opcode = (tsbk >> 88) & 0x3f
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#print "TSBK: 0x%02x 0x%024x" % (opcode, tsbk)
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if opcode == 0x02: # group voice chan grant update
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ch1 = (tsbk >> 64) & 0xffff
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ga1 = (tsbk >> 48) & 0xffff
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ch2 = (tsbk >> 32) & 0xffff
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ga2 = (tsbk >> 16) & 0xffff
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print "tsbk02 grant update: chan %s %d %s %d" %(self.format_channel_id(ch1), ga1, self.format_channel_id(ch2), ga2)
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elif opcode == 0x16: # sndcp data ch
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ch1 = (tsbk >> 48) & 0xffff
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ch2 = (tsbk >> 32) & 0xffff
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print "tsbk16 sndcp data ch: chan %x %x" %(ch1, ch2)
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elif opcode == 0x34: # iden_up vhf uhf
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iden = (tsbk >> 76) & 0xf
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bwvu = (tsbk >> 72) & 0xf
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toff0 = (tsbk >> 58) & 0x3fff
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spac = (tsbk >> 48) & 0x3ff
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freq = (tsbk >> 16) & 0xffffffff
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toff_sign = (toff0 >> 13) & 1
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toff = toff0 & 0x1fff
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if toff_sign == 0:
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toff = 0 - toff
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txt = ["mob Tx-", "mob Tx+"]
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self.freq_table[iden] = {}
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self.freq_table[iden]['offset'] = float(toff) * float(spac) * 0.125
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self.freq_table[iden]['step'] = float(spac) * 0.000125
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self.freq_table[iden]['frequency'] = float(freq) * 0.000005
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print "tsbk34 iden vhf/uhf id %d toff %f spac %f freq %f [%s]" % (iden, toff * spac * 0.125 * 1e-3, spac * 0.125, freq * 0.000005, txt[toff_sign])
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elif opcode == 0x3d: # iden_up
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iden = (tsbk >> 76) & 0xf
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bw = (tsbk >> 67) & 0x1ff
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toff0 = (tsbk >> 58) & 0x1ff
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spac = (tsbk >> 48) & 0x3ff
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freq = (tsbk >> 16) & 0xffffffff
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# toff_sign = (toff0 >> 13) & 1
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# toff = toff0 & 0x1fff
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# if toff_sign == 0:
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# toff = 0 - toff
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toff = toff0
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txt = ["mob xmit < recv", "mob xmit > recv"]
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self.freq_table[iden] = {}
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self.freq_table[iden]['offset'] = float(toff) * 0.25
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self.freq_table[iden]['step'] = float(spac) * 0.000125
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self.freq_table[iden]['frequency'] = float(freq) * 0.000005
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print "tsbk3d iden id %d toff %f spac %f freq %f" % (iden, toff * 0.25, spac * 0.125, freq * 0.000005)
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elif opcode == 0x3a: # rfss status
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syid = (tsbk >> 56) & 0xfff
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rfid = (tsbk >> 48) & 0xff
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stid = (tsbk >> 40) & 0xff
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chan = (tsbk >> 24) & 0xffff
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print "tsbk3a rfss status: syid: %x rfid %x stid %d ch1 %x(%s)" %(syid, rfid, stid, chan, self.format_channel_id(chan))
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elif opcode == 0x39: # secondary cc
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rfid = (tsbk >> 72) & 0xff
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stid = (tsbk >> 64) & 0xff
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ch1 = (tsbk >> 48) & 0xffff
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ch2 = (tsbk >> 24) & 0xffff
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print "tsbk39 secondary cc: rfid %x stid %d ch1 %x(%s) ch2 %x(%s)" %(rfid, stid, ch1, self.format_channel_id(ch1), ch2, self.format_channel_id(ch2))
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elif opcode == 0x3b: # network status
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wacn = (tsbk >> 52) & 0xfffff
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syid = (tsbk >> 40) & 0xfff
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ch1 = (tsbk >> 24) & 0xffff
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print "tsbk3b net stat: wacn %x syid %x ch1 %x(%s)" %(wacn, syid, ch1, self.format_channel_id(ch1))
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elif opcode == 0x3c: # adjacent status
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rfid = (tsbk >> 48) & 0xff
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stid = (tsbk >> 40) & 0xff
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ch1 = (tsbk >> 24) & 0xffff
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print "tsbk3c adjacent: rfid %x stid %d ch1 %x(%s)" %(rfid, stid, ch1, self.format_channel_id(ch1))
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#else:
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# print "tsbk other %x" % opcode
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def main():
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q = 0x3a000012ae01013348704a54
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rc = crc16(q,12)
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print "should be zero: %x" % rc
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q = 0x3a001012ae01013348704a54
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rc = crc16(q,12)
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print "should be nonzero: %x" % rc
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t = tsbk()
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q = 0x3a000012ae01013348704a54
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t.decode_tsbk(q)
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if __name__ == '__main__':
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# run tests, if this code is invoked as a program
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main()
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