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 | |
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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,traffic_flag,ch |
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15 | sync_status="False" |
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16 | mode = "sync" #default mode |
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17 | traffic_flag = False |
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18 | class my_top_block(gr.top_block): |
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19 | |
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20 | def __init__(self, mod_class, demod_class, |
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21 | rx_callback, options_tx,options_rx): |
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22 | |
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23 | gr.top_block.__init__(self) |
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24 | self.rxpath = receive_path(demod_class, rx_callback, options_rx) |
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25 | self.txpath = transmit_path(mod_class, options_tx) |
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26 | self.connect(self.txpath); |
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27 | self.connect(self.rxpath); |
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28 | |
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29 | #//////main////// |
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30 | |
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31 | global n_rcvd, n_right |
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32 | |
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33 | def main(): |
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34 | global n_rcvd, n_right,sync_status,mode,ch,traffic_flag |
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35 | n_rcvd = 0 |
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36 | n_right = 0 |
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37 | def send_pkt(self, payload='', eof=False): |
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38 | return self.txpath.send_pkt(payload, eof) |
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39 | |
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40 | def rx_callback(ok, payload): |
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41 | global n_rcvd, n_right,sync_status,mode,ch,traffic_flag |
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42 | ########################## sync ########################### |
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43 | if mode == "sync": |
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44 | if ok == True: |
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45 | (pktno,) = struct.unpack('!H', payload[0:2]) |
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46 | (sync_signal,) = struct.unpack('!s', payload[2]) |
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47 | (data_channel,) = struct.unpack('!H', payload[3:5]) |
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48 | print "printing the elements of packet ",sync_signal," !!!!!!!!!!! ",data_channel," !!!!!\n" |
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49 | if str(sync_signal) == 's' and str(data_channel) == str(ch): |
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50 | sync_status = "True" |
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51 | print "received a sync packet on channel %s\n" %(data_channel) |
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52 | data = 'o' |
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53 | pktno=0 |
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54 | ack_payload = struct.pack('!HsH', pktno & 0xffff,data,ch & 0xffff) #+ data |
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55 | send_pkt(tb,ack_payload) #sending back the acknowledgement |
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56 | |
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57 | ##################################################### |
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58 | |
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59 | ######################### traffic ############################ |
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60 | if mode == "traffic": |
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61 | if ok: |
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62 | (data_header,) = struct.unpack('!s', payload[0]) |
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63 | if data_header == 'd': |
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64 | traffic_flag = True |
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65 | comm = struct.unpack('!14s', payload[1:15]) |
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66 | print("received this ", comm) |
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67 | data = 'dI am fine.....' #Sending this message |
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68 | payload = struct.pack('!15s', data) |
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69 | send_pkt(tb,payload) |
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70 | ############################################################## |
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71 | |
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72 | n_rcvd += 1 |
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73 | if ok: |
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74 | n_right += 1 |
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75 | |
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76 | #print "ok = %5s pktno = %4d n_rcvd = %4d n_right = %4d" % ( |
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77 | # ok, pktno, n_rcvd, n_right) |
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78 | #print "sync_status is ",sync_status," @@\n" |
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79 | |
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80 | mods = modulation_utils.type_1_mods() |
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81 | #print "printing mods",mods,"$$$$\n" |
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82 | demods = modulation_utils.type_1_demods() |
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83 | |
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84 | #setting up the tx options parser |
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85 | parser_tx = OptionParser(option_class=eng_option, conflict_handler="resolve") |
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86 | expert_grp_tx = parser_tx.add_option_group("Expert_tx") |
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87 | #print "printing Expert_tx group",expert_grp_tx,"printing Expert_tx group" |
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88 | parser_tx.add_option("-m", "--modulation", type="choice", choices=mods.keys(), |
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89 | default='gmsk', |
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90 | help="Select modulation from: %s [default=%%default]" |
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91 | % (', '.join(mods.keys()),)) |
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92 | |
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93 | parser_tx.add_option("-s", "--size", type="eng_float", default=1500, |
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94 | help="set packet size [default=%default]") |
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95 | parser_tx.add_option("-M", "--megabytes", type="eng_float", default=1.0, |
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96 | help="set megabytes to transmit [default=%default]") |
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97 | parser_tx.add_option("","--discontinuous", action="store_true", default=False, |
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98 | help="enable discontinous transmission (bursts of 5 packets)") |
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99 | parser_tx.add_option("","--from-file", default=None, |
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100 | help="use file for packet contents") |
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101 | print "printing parser_tx",parser_tx,"printing parser_tx" |
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102 | transmit_path.add_options(parser_tx, expert_grp_tx) |
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103 | |
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104 | for mod in mods.values(): |
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105 | mod.add_options(expert_grp_tx) |
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106 | |
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107 | (options_tx, args_tx) = parser_tx.parse_args () |
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108 | |
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109 | if len(args_tx) != 0: |
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110 | parser_tx.print_help() |
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111 | sys.exit(1) |
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112 | ############# Setting some default values for tx side of the block |
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113 | options_tx.tx_freq = 470e6#462.5625e6 |
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114 | options_tx.samples_per_symbol = 2 |
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115 | options_tx.modulation = 'dbpsk' |
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116 | options_tx.fusb_block_size = 4096 |
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117 | options_tx.fusb_nblocks = 16 |
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118 | options_tx.bitrate = 0.0125e6 |
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119 | ############# |
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120 | |
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121 | if options_tx.tx_freq is None: |
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122 | sys.stderr.write("You must specify -f FREQ or --freq FREQ\n") |
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123 | parser_tx.print_help(sys.stderr) |
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124 | sys.exit(1) |
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125 | |
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126 | if options_tx.from_file is not None: |
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127 | source_file = open(options_tx.from_file, 'r') |
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128 | print "printing modulation type",mods[options_tx.modulation],"**" |
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129 | # build the graph |
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130 | print "printing tx options",options_tx,"&&&&\n" |
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131 | |
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132 | parser_rx = OptionParser (option_class=eng_option, conflict_handler="resolve") |
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133 | print "printing parser_rx",parser_rx,"!!!!!\n" |
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134 | print "after option parser" |
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135 | expert_grp_rx = parser_rx.add_option_group("Expert_rx") |
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136 | print "printing expert group rx",expert_grp_rx,"@@@@\n" |
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137 | parser_rx.add_option("-m", "--modulation", type="choice", choices=demods.keys(), |
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138 | default='gmsk', |
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139 | help="Select modulation from: %s [default=%%default]" |
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140 | % (', '.join(demods.keys()),)) |
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141 | print "inside rx option parser" |
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142 | receive_path.add_options(parser_rx, expert_grp_rx) |
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143 | |
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144 | for mod in demods.values(): |
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145 | mod.add_options(expert_grp_rx) |
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146 | |
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147 | (options_rx, args_rx) = parser_rx.parse_args () |
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148 | |
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149 | if len(args_rx) != 0: |
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150 | parser_rx.print_help(sys.stderr) |
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151 | sys.exit(1) |
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152 | ############# Setting some default values for rx side of the block |
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153 | options_rx.rx_freq = 470e6#462.5625e6 #setting default rx_freq value |
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154 | options_rx.samples_per_symbol = 2 |
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155 | options_rx.modulation = 'dbpsk' |
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156 | options_rx.fusb_block_size = 4096 |
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157 | options_rx.fusb_nblocks = 16 |
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158 | options_rx.bitrate = 0.0125e6 |
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159 | ############# |
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160 | |
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161 | if options_rx.rx_freq is None: |
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162 | sys.stderr.write("You must specify -f FREQ or --freq FREQ\n") |
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163 | parser_rx.print_help(sys.stderr) |
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164 | sys.exit(1) |
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165 | print "printing rx options",options_rx,"&&&&\n" |
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166 | |
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167 | # build the graph |
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168 | |
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169 | tb = my_top_block(mods[options_tx.modulation], |
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170 | demods[options_rx.modulation], |
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171 | rx_callback,options_tx, |
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172 | options_rx) |
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173 | r = gr.enable_realtime_scheduling() |
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174 | if r != gr.RT_OK: |
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175 | print "Warning: failed to enable realtime scheduling" |
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176 | |
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177 | tb.start() |
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178 | #tb.rxpath.disconnect(tb.rxpath.u, tb.rxpath.s2v,tb.rxpath.fft, tb.rxpath.c2mag, tb.rxpath.stats) |
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179 | #tb.rxpath.connect(tb.rxpath.u, tb.rxpath.s2v) |
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180 | #listening to random frequencies untill a match is found |
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181 | running = True |
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182 | global ch |
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183 | while running: |
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184 | ################################################sync mode#################################### |
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185 | if mode == "sync": |
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186 | #sync_status="False" |
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187 | if sync_status != "True": |
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188 | #print "inside while" |
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189 | ch = int(random.choice([1,7,8,14])) |
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190 | if ch < 8: |
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191 | hop_freq = float(1e6 * (462.5625+(ch-1)*0.025))#setting the centre freq frequency for sending packets |
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192 | else: |
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193 | hop_freq = float(1e6 * (467.5625+(ch-8)*0.025))#setting the centre freq frequency for sending packets |
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194 | #print "hop freq is",hop_freq,"@@@@\n" |
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195 | |
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196 | tb.txpath.set_freq(hop_freq) |
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197 | tb.rxpath.set_freq(hop_freq) |
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198 | ch_energy = tb.rxpath.probe.level() #check if primary user is present |
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199 | #if int(ch_energy) > 1.0e7: |
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200 | print "hop freq is ",hop_freq," and channel energy is ",ch_energy,"\n" |
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201 | if int(ch_energy) > 2e7: #if primary user is there then dont transmit on this channel |
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202 | continue |
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203 | time.sleep(0.1) |
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204 | else: |
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205 | print "sync channel is found...channel ",ch,"\n" |
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206 | check_sync = 0 |
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207 | mode = "traffic" |
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208 | traffic_flag = False |
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209 | sync_status="False" |
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210 | continue |
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211 | |
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212 | ################################################end of sync mode#################################### |
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213 | |
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214 | ################################################Communications mode#################################### |
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215 | if mode == "traffic": |
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216 | print "Inside traffic mode" |
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217 | if check_sync == 0: |
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218 | time.sleep(0.8) |
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219 | if traffic_flag != True: |
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220 | mode = "sync" |
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221 | continue |
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222 | else: |
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223 | check_sync = 1 |
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224 | #nbytes = 15 |
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225 | #pkt_size = 15 |
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226 | #sync_pktno = 0 |
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227 | #n =0 |
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228 | #while n < nbytes: |
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229 | #print >> myfile, "inside while" |
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230 | # if options_tx.from_file is None: |
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231 | #data = (pkt_size - 2) * chr(data_pktno & 0xff) #0xff is 255 |
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232 | # data = 'dI am fine.....' #Sending this message |
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233 | #print >> myfile, data |
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234 | #print "printing data",data,"****\n" |
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235 | # else: |
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236 | # data = source_file.read(pkt_size - 2) |
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237 | # if data == '': |
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238 | # break; |
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239 | |
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240 | # |
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241 | # payload = struct.pack('!15s', data) |
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242 | #print "printing payload",payload,"**\n" |
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243 | |
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244 | # send_pkt(tb,payload) |
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245 | #print "printing payload",payload,"**\n" |
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246 | # n += len(payload) |
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247 | # sys.stderr.write('.') |
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248 | # if options_tx.discontinuous and data_pktno % 5 == 4: |
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249 | # time.sleep(1) |
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250 | # data_pktno += 1 |
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251 | # #print "before sleeping for 10 seconds and value of resend count is",resend_count |
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252 | time.sleep(0.2) |
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253 | ch_energy = tb.rxpath.probe.level() #check if primary user is present |
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254 | print "channel energy is ",ch_energy,"\n" |
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255 | if int(ch_energy) > 2e7: #if primary user is there then dont transmit on this channel |
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256 | mode = "sync" |
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257 | continue |
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258 | |
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259 | ################################################ end of Communications mode#################################### |
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260 | |
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261 | |
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262 | |
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263 | #tb.wait() |
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264 | |
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265 | if __name__ == '__main__': |
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266 | try: |
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267 | main() |
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268 | except KeyboardInterrupt: |
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269 | pass |
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