| 1 | #!/usr/bin/env python |
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| 2 | #Transmission and reception, one ata a time on the same antena |
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| 3 | |
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| 4 | from gnuradio import gr, gru, modulation_utils |
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| 5 | from gnuradio import eng_notation |
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| 6 | from gnuradio.eng_option import eng_option |
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| 7 | from optparse import OptionParser |
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| 8 | from numpy import random |
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| 9 | import random, time, struct, sys, math |
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| 10 | import traceback |
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| 11 | # from current dir |
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| 12 | from transmit_path import transmit_path |
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| 13 | from receive_path import receive_path |
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| 14 | global sync_status,mode |
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| 15 | sync_status=False |
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| 16 | mode = "sync" #default mode of operation... |
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| 17 | class my_top_block(gr.top_block): |
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| 18 | |
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| 19 | def __init__(self, mod_class, demod_class, |
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| 20 | rx_callback, options_tx,options_rx): |
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| 21 | |
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| 22 | gr.top_block.__init__(self) |
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| 23 | self.rxpath = receive_path(demod_class, rx_callback, options_rx) |
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| 24 | self.txpath = transmit_path(mod_class, options_tx) |
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| 25 | self.connect(self.txpath); |
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| 26 | self.connect(self.rxpath); |
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| 27 | |
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| 28 | #//////main////// |
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| 29 | |
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| 30 | global n_rcvd, n_right,ch,traffic_flag |
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| 31 | traffic_flag = False |
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| 32 | |
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| 33 | def main(): |
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| 34 | global n_rcvd, n_right,sync_status,sync_pktno,ch,mode,traffic_flag |
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| 35 | sync_pktno =0 |
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| 36 | n_rcvd = 0 |
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| 37 | n_right = 0 |
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| 38 | def send_pkt(self, payload='', eof=False): |
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| 39 | return self.txpath.send_pkt(payload, eof) |
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| 40 | |
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| 41 | def rx_callback(ok, payload): |
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| 42 | global n_rcvd, n_right,sync_status,sync_pktno,ch,mode,traffic_flag |
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| 43 | #(pktno,) = struct.unpack('!H', payload[0:2]) |
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| 44 | print "inside rx callback" |
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| 45 | ########################## sync ########################### |
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| 46 | if mode == "sync": |
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| 47 | if ok == True: |
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| 48 | (sync_signal,) = struct.unpack('!s', payload[2]) |
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| 49 | (sync_signal_red,) = struct.unpack('!s', payload[3]) #redundant sync bit |
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| 50 | (data_channel,) = struct.unpack('!s', payload[4]) |
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| 51 | (data_channel_red,) = struct.unpack('!s', payload[5]) #redundant channel bit |
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| 52 | print "printing the elements of packet ",str(sync_signal)," !!!!!!!!!!! ",str(sync_signal_red)," !!!!!\n" |
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| 53 | print "printing the channel ",str(data_channel_red)," !!!!!!!!!!! ",str(data_channel_red)," !!!!!\n" |
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| 54 | #if str(sync_signal) == 's' and str(sync_signal_red) == 's' and str(data_channel) == str(data_channel_red): |
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| 55 | if str(data_channel) == str(ch): |
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| 56 | #print "inside if" |
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| 57 | sync_status = True |
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| 58 | #tb.stop() |
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| 59 | #print "received a sync packet on channel %s\n" %(data_channel) |
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| 60 | data = str('o'+'o'+str(data_channel)+str(data_channel)) |
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| 61 | #print "sending this data",data,"@@@@@\n" |
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| 62 | #sync_pktno=0 |
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| 63 | ack_payload = struct.pack('!H', sync_pktno & 0xffff) + data |
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| 64 | sync_pktno+=1 |
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| 65 | #print "printing ack packet and sent pkt no ",ack_payload," ",sync_pktno,"\n" |
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| 66 | #print "printing the 3rd byte ",struct.unpack('!s', ack_payload[2]) ," \n" |
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| 67 | #k=0 |
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| 68 | #while k < 10000: |
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| 69 | #print "inside while" |
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| 70 | send_pkt(tb,ack_payload) #sending back the acknowledgement |
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| 71 | #k=k+1 |
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| 72 | print "ok = %5s sync_pktno = %4d n_rcvd = %4d n_right = %4d" % ( |
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| 73 | ok, sync_pktno, n_rcvd, n_right) |
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| 74 | |
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| 75 | ##################################################### |
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| 76 | |
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| 77 | ######################### traffic ############################ |
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| 78 | if mode == "traffic": |
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| 79 | |
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| 80 | if ok: |
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| 81 | print "received a packet" |
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| 82 | (data_header,) = struct.unpack('!s', payload[0]) |
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| 83 | if data_header == 'd': |
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| 84 | traffic_flag = True |
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| 85 | (comm,) = struct.unpack('!14s', payload[1:15]) |
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| 86 | print "received this ", comm,"\n" |
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| 87 | data = 'dI am fine.....' #Sending this message |
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| 88 | payload = struct.pack('!15s', data) |
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| 89 | send_pkt(tb,payload) |
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| 90 | |
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| 91 | else: |
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| 92 | print "not ok" |
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| 93 | |
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| 94 | ############################################################## |
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| 95 | |
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| 96 | |
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| 97 | |
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| 98 | n_rcvd += 1 |
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| 99 | if ok: |
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| 100 | n_right += 1 |
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| 101 | |
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| 102 | #print "ok = %5s pktno = %4d n_rcvd = %4d n_right = %4d" % ( |
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| 103 | # ok, pktno, n_rcvd, n_right) |
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| 104 | #print "ok = %5s n_rcvd = %4d n_right = %4d" % ( |
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| 105 | # ok, n_rcvd, n_right) |
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| 106 | |
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| 107 | #print "sync_status is ",sync_status," @@\n" |
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| 108 | |
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| 109 | mods = modulation_utils.type_1_mods() |
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| 110 | #print "printing mods",mods,"$$$$\n" |
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| 111 | demods = modulation_utils.type_1_demods() |
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| 112 | |
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| 113 | #setting up the tx options parser |
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| 114 | parser_tx = OptionParser(option_class=eng_option, conflict_handler="resolve") |
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| 115 | expert_grp_tx = parser_tx.add_option_group("Expert_tx") |
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| 116 | #print "printing Expert_tx group",expert_grp_tx,"printing Expert_tx group" |
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| 117 | parser_tx.add_option("-m", "--modulation", type="choice", choices=mods.keys(), |
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| 118 | default='gmsk', |
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| 119 | help="Select modulation from: %s [default=%%default]" |
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| 120 | % (', '.join(mods.keys()),)) |
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| 121 | |
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| 122 | parser_tx.add_option("-s", "--size", type="eng_float", default=1500, |
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| 123 | help="set packet size [default=%default]") |
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| 124 | parser_tx.add_option("-M", "--megabytes", type="eng_float", default=1.0, |
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| 125 | help="set megabytes to transmit [default=%default]") |
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| 126 | parser_tx.add_option("","--discontinuous", action="store_true", default=False, |
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| 127 | help="enable discontinous transmission (bursts of 5 packets)") |
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| 128 | parser_tx.add_option("","--from-file", default=None, |
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| 129 | help="use file for packet contents") |
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| 130 | print "printing parser_tx",parser_tx,"printing parser_tx" |
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| 131 | transmit_path.add_options(parser_tx, expert_grp_tx) |
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| 132 | |
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| 133 | for mod in mods.values(): |
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| 134 | mod.add_options(expert_grp_tx) |
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| 135 | |
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| 136 | (options_tx, args_tx) = parser_tx.parse_args () |
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| 137 | |
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| 138 | if len(args_tx) != 0: |
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| 139 | parser_tx.print_help() |
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| 140 | sys.exit(1) |
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| 141 | ############# Setting some default values for tx side of the block |
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| 142 | options_tx.tx_freq = 462.5625e6 |
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| 143 | options_tx.samples_per_symbol = 2 |
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| 144 | options_tx.modulation = 'dbpsk' |
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| 145 | options_tx.fusb_block_size = 4096 |
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| 146 | options_tx.fusb_nblocks = 16 |
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| 147 | options_tx.bitrate = 0.0125e6 |
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| 148 | ############# |
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| 149 | if options_tx.tx_freq is None: |
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| 150 | sys.stderr.write("You must specify -f FREQ or --freq FREQ\n") |
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| 151 | parser_tx.print_help(sys.stderr) |
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| 152 | sys.exit(1) |
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| 153 | |
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| 154 | if options_tx.from_file is not None: |
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| 155 | source_file = open(options_tx.from_file, 'r') |
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| 156 | print "printing modulation type",mods[options_tx.modulation],"**" |
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| 157 | # build the graph |
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| 158 | print "printing tx options",options_tx,"&&&&\n" |
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| 159 | #tb = my_top_block(mods[options_tx.modulation], options_tx) |
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| 160 | |
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| 161 | #r = gr.enable_realtime_scheduling() |
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| 162 | #if r != gr.RT_OK: |
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| 163 | # print "Warning: failed to enable realtime scheduling" |
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| 164 | |
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| 165 | #setting up rx options parser |
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| 166 | |
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| 167 | # Create Options Parser: |
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| 168 | parser_rx = OptionParser (option_class=eng_option, conflict_handler="resolve") |
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| 169 | print "printing parser_rx",parser_rx,"!!!!!\n" |
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| 170 | print "after option parser" |
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| 171 | expert_grp_rx = parser_rx.add_option_group("Expert_rx") |
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| 172 | print "printing expert group rx",expert_grp_rx,"@@@@\n" |
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| 173 | parser_rx.add_option("-m", "--modulation", type="choice", choices=demods.keys(), |
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| 174 | default='gmsk', |
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| 175 | help="Select modulation from: %s [default=%%default]" |
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| 176 | % (', '.join(demods.keys()),)) |
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| 177 | print "inside rx option parser" |
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| 178 | receive_path.add_options(parser_rx, expert_grp_rx) |
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| 179 | |
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| 180 | for mod in demods.values(): |
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| 181 | mod.add_options(expert_grp_rx) |
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| 182 | |
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| 183 | (options_rx, args_rx) = parser_rx.parse_args () |
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| 184 | |
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| 185 | if len(args_rx) != 0: |
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| 186 | parser_rx.print_help(sys.stderr) |
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| 187 | sys.exit(1) |
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| 188 | ############# Setting some default values for rx side of the block |
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| 189 | options_rx.rx_freq = 462.5625e6 #setting default rx_freq value |
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| 190 | options_rx.samples_per_symbol = 2 |
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| 191 | options_rx.modulation = 'dbpsk' |
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| 192 | options_rx.fusb_block_size = 4096 |
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| 193 | options_rx.fusb_nblocks = 16 |
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| 194 | options_rx.bitrate = 0.0125e6 |
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| 195 | ############# |
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| 196 | if options_rx.rx_freq is None: |
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| 197 | sys.stderr.write("You must specify -f FREQ or --freq FREQ\n") |
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| 198 | parser_rx.print_help(sys.stderr) |
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| 199 | sys.exit(1) |
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| 200 | print "printing rx options",options_rx,"&&&&\n" |
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| 201 | #options_rx.decim=128 #setting the decimation for receive path |
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| 202 | |
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| 203 | # build the graph |
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| 204 | |
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| 205 | tb = my_top_block(mods[options_tx.modulation], |
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| 206 | demods[options_rx.modulation], |
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| 207 | rx_callback,options_tx, |
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| 208 | options_rx) |
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| 209 | r = gr.enable_realtime_scheduling() |
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| 210 | if r != gr.RT_OK: |
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| 211 | print "Warning: failed to enable realtime scheduling" |
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| 212 | print "printing the decimation ",options_rx.decim,"\n" |
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| 213 | tb.start() |
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| 214 | #listening to random frequencies untill a match is found |
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| 215 | running = True |
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| 216 | global ch |
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| 217 | while running: |
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| 218 | ################################################sync mode#################################### |
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| 219 | if mode == "sync": |
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| 220 | |
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| 221 | if sync_status != True: |
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| 222 | #print "inside while" |
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| 223 | #ch = random.randint(1, 7) |
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| 224 | ch = int(random.choice('37')) |
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| 225 | #ch = random.randint(6, 12) |
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| 226 | #ch = 1 |
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| 227 | #hop_freq = float(1e6 * (400+(ch-1)*10))#setting the centre freq frequency for sending packets |
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| 228 | hop_freq = float(1e6 * (462.5625+(ch-1)*0.025)) |
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| 229 | tb.rxpath.min_freq = hop_freq - 80e3 |
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| 230 | tb.rxpath.max_freq = hop_freq + 80e3 |
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| 231 | is_present = tb.rxpath.get_spec_stats(1e13,1) #check if primary user is present |
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| 232 | print "hop freq is",hop_freq,"@@@@\n" |
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| 233 | if is_present == True: #if primary user is there then dont transmit on this channel |
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| 234 | print "Cant use this channel..Primary user detected\n" |
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| 235 | continue |
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| 236 | #hop_freq = float(1e6 * (462.5625+(5-1)*0.05)) |
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| 237 | |
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| 238 | tb.txpath.set_freq(hop_freq) |
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| 239 | tb.rxpath.set_freq(hop_freq) |
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| 240 | time.sleep(0.05) |
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| 241 | #time.sleep(2) |
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| 242 | else: |
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| 243 | print "inside lese of while check" |
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| 244 | check_sync = 0 |
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| 245 | traffic_flag = False |
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| 246 | print "sync channel is found! and it is channel ",ch," \n" |
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| 247 | mode = "traffic" |
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| 248 | #tb.stop() |
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| 249 | #break |
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| 250 | #temp_variable = 2 |
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| 251 | #if temp_variable == 2: |
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| 252 | # print "success" |
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| 253 | |
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| 254 | |
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| 255 | |
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| 256 | ################################################end of sync mode#################################### |
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| 257 | |
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| 258 | ################################################Communications mode#################################### |
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| 259 | if mode == "traffic": |
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| 260 | print "Inside traffic mode" |
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| 261 | ##################### for ensuring sync ##################### |
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| 262 | if check_sync == 0: |
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| 263 | time.sleep(0.4) |
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| 264 | if traffic_flag != True: |
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| 265 | mode = "sync" |
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| 266 | sync_status=False |
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| 267 | continue |
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| 268 | else: |
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| 269 | check_sync == 1 |
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| 270 | ############################################################ |
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| 271 | |
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| 272 | #nbytes = 15 |
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| 273 | #pkt_size = 15 |
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| 274 | #data_pktno = 0 |
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| 275 | #n = 0 |
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| 276 | #while n < nbytes: |
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| 277 | # #print >> myfile, "inside while" |
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| 278 | # if options_tx.from_file is None: |
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| 279 | # #data = (pkt_size - 2) * chr(data_pktno & 0xff) #0xff is 255 |
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| 280 | # data = 'dI am fine.....' #Sending this message |
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| 281 | # #print >> myfile, data |
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| 282 | # #print "printing data",data,"****\n" |
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| 283 | # else: |
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| 284 | # data = source_file.read(pkt_size - 2) |
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| 285 | # if data == '': |
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| 286 | # break; |
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| 287 | # |
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| 288 | # |
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| 289 | # payload = struct.pack('!15s', data) |
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| 290 | #print "printing payload",payload,"**\n" |
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| 291 | |
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| 292 | # send_pkt(tb,payload) |
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| 293 | # time.sleep(0.5) |
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| 294 | #print "printing payload",payload,"**\n" |
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| 295 | # n += len(payload) |
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| 296 | # sys.stderr.write('.') |
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| 297 | # if options_tx.discontinuous and data_pktno % 5 == 4: |
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| 298 | # time.sleep(1) |
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| 299 | # data_pktno += 1 |
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| 300 | #print "before sleeping for 10 seconds and value of resend count is",resend_count |
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| 301 | |
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| 302 | tb.rxpath.min_freq = hop_freq - 80e3 |
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| 303 | tb.rxpath.max_freq = hop_freq + 80e3 |
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| 304 | is_present = tb.rxpath.get_spec_stats(1e13,10) #check if primary user is present |
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| 305 | if is_present == True: #if primary user is present then get out of this communication channel, back to sync mode. |
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| 306 | mode = "sync" |
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| 307 | sync_status=False |
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| 308 | print "Moving out of this channel..Primary user detected\n" |
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| 309 | time.sleep(0.5) |
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| 310 | ################################################ end of Communications mode#################################### |
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| 311 | |
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| 312 | |
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| 313 | |
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| 314 | #var2 = 2 |
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| 315 | #if var2 ==2: |
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| 316 | # print "just checking this bug" |
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| 317 | |
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| 318 | |
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| 319 | # generate and send packets |
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| 320 | #print "printing megamytes",options_tx.megabytes," $$$$\n" |
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| 321 | #myfile = file("log.txt", 'w') |
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| 322 | #traceback.print_tb(traceback,None,myfile) |
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| 323 | |
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| 324 | #tb.wait() |
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| 325 | #tb.stop() |
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| 326 | |
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| 327 | if __name__ == '__main__': |
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| 328 | try: |
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| 329 | main() |
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| 330 | except KeyboardInterrupt: |
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| 331 | pass |
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