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,ch |
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15 | sync_status = "False" |
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16 | mode = "sync"#default mode is sync |
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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 |
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31 | |
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32 | def main(): |
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33 | global n_rcvd, n_right,sync_status,mode,ch |
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34 | n_rcvd = 0 |
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35 | n_right = 0 |
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36 | def send_pkt(self, payload='', eof=False): |
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37 | return self.txpath.send_pkt(payload, eof) |
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38 | |
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39 | def rx_callback(ok, payload): |
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40 | print "inside rx callback" |
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41 | global n_rcvd, n_right, sync_status,mode,ch |
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42 | ############################################################## |
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43 | if mode == "sync": |
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44 | if ok: |
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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) == 'o' and str(data_channel) == str(ch): |
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50 | #print "inside if2" |
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51 | sync_status = "True" |
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52 | #tb.stop() |
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53 | #print "after tb stop ans sync status is ",sync_status," sync status\n" |
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54 | |
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55 | ############################################################## |
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56 | |
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57 | ######################### traffic ############################ |
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58 | if mode == "traffic": |
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59 | |
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60 | if ok: |
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61 | (data_header,) = struct.unpack('!s', payload[0]) |
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62 | if data_header == 'd': |
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63 | comm = struct.unpack('!14s', payload[1:15]) |
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64 | print("received this ", comm) |
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65 | |
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66 | ############################################################## |
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67 | |
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68 | n_rcvd += 1 |
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69 | if ok: |
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70 | n_right += 1 |
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71 | |
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72 | #print "ok = %5s pktno = %4d n_rcvd = %4d n_right = %4d" % ( |
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73 | # ok, pktno, n_rcvd, n_right) |
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74 | |
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75 | mods = modulation_utils.type_1_mods() |
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76 | demods = modulation_utils.type_1_demods() |
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77 | |
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78 | #setting up the tx options parser |
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79 | parser_tx = OptionParser(option_class=eng_option, conflict_handler="resolve") |
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80 | expert_grp_tx = parser_tx.add_option_group("Expert_tx") |
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81 | print "printing Expert_tx group",expert_grp_tx,"printing Expert_tx group" |
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82 | parser_tx.add_option("-m", "--modulation", type="choice", choices=mods.keys(), |
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83 | default='gmsk', |
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84 | help="Select modulation from: %s [default=%%default]" |
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85 | % (', '.join(mods.keys()),)) |
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86 | |
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87 | parser_tx.add_option("-s", "--size", type="eng_float", default=1500, |
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88 | help="set packet size [default=%default]") |
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89 | parser_tx.add_option("-M", "--megabytes", type="eng_float", default=1.0, |
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90 | help="set megabytes to transmit [default=%default]") |
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91 | parser_tx.add_option("","--discontinuous", action="store_true", default=False, |
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92 | help="enable discontinous transmission (bursts of 5 packets)") |
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93 | parser_tx.add_option("","--from-file", default=None, |
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94 | help="use file for packet contents") |
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95 | print "printing parser_tx",parser_tx,"printing parser_tx" |
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96 | transmit_path.add_options(parser_tx, expert_grp_tx) |
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97 | |
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98 | for mod in mods.values(): |
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99 | mod.add_options(expert_grp_tx) |
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100 | |
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101 | (options_tx, args_tx) = parser_tx.parse_args () |
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102 | ############# Setting some default values for tx side of the block |
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103 | options_tx.tx_freq = 480e6#462.5625e6 |
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104 | options_tx.samples_per_symbol = 2 |
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105 | options_tx.modulation = 'dbpsk' |
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106 | #options_tx.fusb_block_size = 4096 |
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107 | #options_tx.fusb_nblocks = 16 |
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108 | options_tx.bitrate = 0.0125e6 |
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109 | ############# |
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110 | if len(args_tx) != 0: |
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111 | parser_tx.print_help() |
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112 | sys.exit(1) |
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113 | |
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114 | if options_tx.tx_freq is None: |
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115 | sys.stderr.write("You must specify -f FREQ or --freq FREQ\n") |
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116 | parser_tx.print_help(sys.stderr) |
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117 | sys.exit(1) |
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118 | |
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119 | if options_tx.from_file is not None: |
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120 | source_file = open(options_tx.from_file, 'r') |
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121 | print "printing modulation type",mods[options_tx.modulation],"**" |
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122 | # build the graph |
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123 | print "printing tx options",options_tx,"&&&&\n" |
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124 | |
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125 | parser_rx = OptionParser (option_class=eng_option, conflict_handler="resolve") |
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126 | print "printing parser_rx",parser_rx,"!!!!!\n" |
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127 | print "after option parser" |
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128 | expert_grp_rx = parser_rx.add_option_group("Expert_rx") |
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129 | print "printing expert group rx",expert_grp_rx,"@@@@\n" |
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130 | parser_rx.add_option("-m", "--modulation", type="choice", choices=demods.keys(), |
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131 | default='gmsk', |
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132 | help="Select modulation from: %s [default=%%default]" |
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133 | % (', '.join(demods.keys()),)) |
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134 | print "inside rx option parser" |
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135 | receive_path.add_options(parser_rx, expert_grp_rx) |
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136 | |
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137 | for mod in demods.values(): |
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138 | mod.add_options(expert_grp_rx) |
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139 | |
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140 | (options_rx, args_rx) = parser_rx.parse_args () |
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141 | |
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142 | if len(args_rx) != 0: |
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143 | parser_rx.print_help(sys.stderr) |
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144 | sys.exit(1) |
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145 | ############# Setting some default values for rx side of the block |
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146 | options_rx.rx_freq = 480e6#462.5625e6 #setting default rx_freq value |
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147 | options_rx.samples_per_symbol = 2 |
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148 | options_rx.modulation = 'dbpsk' |
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149 | #options_rx.fusb_block_size = 4096 |
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150 | #options_rx.fusb_nblocks = 16 |
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151 | options_rx.bitrate = 0.0125e6 |
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152 | ############# |
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153 | if options_rx.rx_freq is None: |
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154 | sys.stderr.write("You must specify -f FREQ or --freq FREQ\n") |
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155 | parser_rx.print_help(sys.stderr) |
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156 | sys.exit(1) |
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157 | print "printing rx options",options_rx,"&&&&\n" |
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158 | |
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159 | # build the graph |
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160 | |
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161 | tb = my_top_block(mods[options_tx.modulation], |
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162 | demods[options_rx.modulation], |
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163 | rx_callback,options_tx, |
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164 | options_rx) |
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165 | r = gr.enable_realtime_scheduling() |
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166 | if r != gr.RT_OK: |
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167 | print "Warning: failed to enable realtime scheduling" |
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168 | |
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169 | tb.start() |
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170 | #tb.rxpath.disconnect(tb.rxpath.u, tb.rxpath.s2v,tb.rxpath.fft, tb.rxpath.c2mag, tb.rxpath.stats) |
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171 | |
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172 | |
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173 | #options_tx.size = 6 #2 bytes for packet size,2 bytes for the synchronization request(including redundant bit) and 2 bits to specify the channel number(including redundant bit) |
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174 | |
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175 | #print "printing packet size",pkt_size,"pkt size\n" |
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176 | |
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177 | myfile = file("logfile.txt", 'w') |
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178 | myfile.write("") |
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179 | #sending sync packet-format |
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180 | global ch |
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181 | running = True |
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182 | |
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183 | while running: |
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184 | |
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185 | ################################################sync mode#################################### |
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186 | if mode == "sync": |
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187 | #sync_status = "False" |
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188 | if sync_status != "True": |
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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 | |
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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 | |
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199 | k = 0 |
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200 | total_energy = 0 |
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201 | while k < 1: |
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202 | ch_energy = tb.rxpath.probe.level() #check if primary user is present |
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203 | total_energy = total_energy + ch_energy |
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204 | k+=1 |
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205 | |
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206 | avg_energy = total_energy/1 |
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207 | print "printing hop frequency ",hop_freq,"and energy is ",avg_energy,"\n" |
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208 | if int(avg_energy) > 2e7: #if primary user is there then dont transmit on this channel |
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209 | #while |
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210 | continue |
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211 | #print "present" |
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212 | |
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213 | nbytes = 5 #int(1e6 * .0003) |
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214 | pkt_size = 5 |
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215 | n = 0 |
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216 | pktno = 0 |
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217 | while n < nbytes: |
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218 | if options_tx.from_file is None: |
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219 | #data = (pkt_size - 2) * chr(pktno & 0xff) #0xff is 255 |
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220 | data = 's'#+'s'+str(ch)+str(ch) #adding redundant bits for sync and channel |
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221 | else: |
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222 | data = source_file.read(pkt_size - 2) |
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223 | if data == '': |
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224 | break; |
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225 | |
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226 | payload = struct.pack('!HsH', pktno & 0xffff,data,ch & 0xffff) #+ data |
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227 | #print "printing payload",payload,"**\n" |
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228 | |
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229 | send_pkt(tb,payload) |
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230 | #print "sending this data ",data,"\n" |
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231 | n += len(payload) |
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232 | sys.stderr.write('.') |
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233 | if options_tx.discontinuous and pktno % 5 == 4: |
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234 | time.sleep(1) |
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235 | pktno += 1 |
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236 | time.sleep(0.1) |
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237 | #resend_count += 1 |
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238 | else: |
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239 | print "sync channel found..channel ",ch,"\n" |
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240 | mode = "traffic" |
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241 | sync_status = "False" |
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242 | ################################################end of sync mode#################################### |
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243 | |
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244 | ################################################Communications mode#################################### |
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245 | if mode == "traffic": |
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246 | print "inside traffic mode \n" |
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247 | nbytes = 15 |
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248 | pkt_size = 15 |
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249 | data_pktno = 0 |
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250 | n = 0 |
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251 | while n < nbytes: |
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252 | #print >> myfile, "inside while" |
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253 | if options_tx.from_file is None: |
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254 | #data = (pkt_size - 2) * chr(data_pktno & 0xff) #0xff is 255 |
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255 | data = 'dHi how are you' #Sending this message |
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256 | #print >> myfile, data |
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257 | #print "printing data",data,"****\n" |
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258 | else: |
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259 | data = source_file.read(pkt_size - 2) |
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260 | if data == '': |
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261 | break; |
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262 | |
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263 | |
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264 | payload = struct.pack('!15s', data) |
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265 | #print "printing payload",payload,"**\n" |
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266 | |
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267 | send_pkt(tb,payload) |
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268 | #print "printing payload",payload,"**\n" |
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269 | n += len(payload) |
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270 | sys.stderr.write('.') |
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271 | if options_tx.discontinuous and data_pktno % 5 == 4: |
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272 | time.sleep(1) |
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273 | data_pktno += 1 |
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274 | #print "before sleeping for 10 seconds and value of resend count is",resend_count |
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275 | time.sleep(0.2) |
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276 | ch_energy = tb.rxpath.probe.level() #check if primary user is present |
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277 | print "energy is ",ch_energy,"\n" |
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278 | if int(ch_energy) > 2e7: #if primary user is there then dont transmit on this channel |
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279 | print "primary user detected..moving out of this channel\n" |
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280 | mode = "sync" |
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281 | continue |
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282 | |
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283 | ################################################ end of Communications mode#################################### |
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284 | |
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285 | |
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286 | |
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287 | if __name__ == '__main__': |
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288 | try: |
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289 | main() |
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290 | except KeyboardInterrupt: |
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291 | pass |
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