1 | #include <iostream>
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2 | #include <string>
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3 | #include <boost/asio.hpp>
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4 | #include <boost/bind.hpp>
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5 | #include <boost/lexical_cast.hpp>
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6 | #include <boost/asio/deadline_timer.hpp>
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7 | #include <boost/enable_shared_from_this.hpp>
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8 |
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9 | using boost::lexical_cast;
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10 |
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11 | #include "Time.h"
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12 | #include "Converter.h"
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13 |
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14 | #include "HeadersFTM.h"
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15 |
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16 | using namespace std;
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17 | using namespace FTM;
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18 |
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19 | namespace ba = boost::asio;
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20 | namespace bs = boost::system;
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21 | namespace dummy = ba::placeholders;
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22 |
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23 | using boost::lexical_cast;
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24 | using ba::ip::tcp;
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25 |
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26 | int Port = 0;
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27 |
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28 | // ------------------------------------------------------------------------
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29 |
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30 |
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31 | // ------------------------------------------------------------------------
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32 |
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33 | class tcp_connection : public ba::ip::tcp::socket, public boost::enable_shared_from_this<tcp_connection>
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34 | {
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35 | private:
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36 |
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37 | double fStartTime;
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38 |
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39 | void AsyncRead(ba::mutable_buffers_1 buffers)
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40 | {
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41 | ba::async_read(*this, buffers,
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42 | boost::bind(&tcp_connection::HandleReceivedData, shared_from_this(),
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43 | dummy::error, dummy::bytes_transferred));
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44 | }
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45 |
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46 | void AsyncWrite(const ba::const_buffers_1 &buffers)
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47 | {
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48 | ba::async_write(*this, buffers,
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49 | boost::bind(&tcp_connection::HandleSentData, shared_from_this(),
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50 | dummy::error, dummy::bytes_transferred));
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51 | }
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52 | void AsyncWait(ba::deadline_timer &timer, int seconds,
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53 | void (tcp_connection::*handler)(const bs::error_code&))// const
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54 | {
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55 | timer.expires_from_now(boost::posix_time::seconds(seconds));
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56 | timer.async_wait(boost::bind(handler, shared_from_this(), dummy::error));
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57 | }
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58 |
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59 | ba::deadline_timer fTriggerDynData;
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60 |
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61 | // The constructor is prvate to force the obtained pointer to be shared
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62 | tcp_connection(ba::io_service& ioservice) : ba::ip::tcp::socket(ioservice),
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63 | fTriggerDynData(ioservice)
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64 | {
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65 | //deadline_.expires_at(boost::posix_time::pos_infin);
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66 |
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67 | fHeader.fDelimiter=kDelimiterStart;
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68 | fHeader.fState=FTM::kFtmIdle;
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69 | fHeader.fBoardId=0xaffe;
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70 | fHeader.fFirmwareId=0x42;
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71 |
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72 | fDelimiter = htons(kDelimiterEnd);
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73 |
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74 | fStaticData.clear();
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75 |
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76 | fStaticData.fMultiplicityPhysics = 1;
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77 | fStaticData.fMultiplicityCalib = 40;
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78 | fStaticData.fWindowCalib = 1;
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79 | fStaticData.fWindowPhysics = 0;
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80 | fStaticData.fDelayTrigger = 21;
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81 | fStaticData.fDelayTimeMarker = 42;
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82 | fStaticData.fDeadTime = 84;
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83 |
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84 | fStaticData.fClockConditioner[0] = 100;
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85 | fStaticData.fClockConditioner[1] = 1;
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86 | fStaticData.fClockConditioner[2] = 8;
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87 | fStaticData.fClockConditioner[3] = 9;
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88 | fStaticData.fClockConditioner[4] = 11;
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89 | fStaticData.fClockConditioner[5] = 13;
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90 | fStaticData.fClockConditioner[6] = 14;
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91 | fStaticData.fClockConditioner[7] = 15;
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92 |
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93 | fStaticData.fTriggerSequence = 1 | (2<<5) | (3<<10);
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94 |
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95 | fStaticData.fGeneralSettings =
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96 | FTM::StaticData::kTrigger |
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97 | FTM::StaticData::kLPext |
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98 | FTM::StaticData::kPedestal;
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99 |
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100 | fStaticData.fActiveFTU[0] = 0x3ff;
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101 | fStaticData.fActiveFTU[3] = 0x3ff;
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102 |
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103 | for (int i=0; i<40; i++)
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104 | {
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105 | for (int p=0; p<4; p++)
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106 | fStaticData[i].fEnable[p] = 0x1ff;
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107 |
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108 | for (int p=0; p<5; p++)
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109 | fStaticData[i].fDAC[p] = (p+1)*10;
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110 |
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111 | fStaticData[i].fPrescaling = 42;
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112 | }
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113 |
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114 | for (unsigned long long i=0; i<40; i++)
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115 | {
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116 | fFtuList[i].fDNA = (i<<48)|(i<<32)|(i<<16)|i;
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117 | fFtuList[i].fPingAddr = (1<<8) | i;
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118 | }
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119 |
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120 | fFtuList[1].fPingAddr = (1<<9) | 1;
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121 | fFtuList[0].fPingAddr = 0;
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122 |
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123 | fFtuList.fNumBoards = 19;
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124 | fFtuList.fNumBoardsCrate[0] = 9;
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125 | fFtuList.fNumBoardsCrate[1] = 0;
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126 | fFtuList.fNumBoardsCrate[2] = 0;
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127 | fFtuList.fNumBoardsCrate[3] = 10;
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128 | }
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129 |
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130 | // Callback when writing was successfull or failed
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131 | void HandleSentData(const boost::system::error_code& error, size_t bytes_transferred)
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132 | {
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133 | cout << "Data sent: (transmitted=" << bytes_transferred << ") rc=" << error.message() << " (" << error << ")" << endl;
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134 | }
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135 |
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136 | vector<uint16_t> fBufCommand;
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137 | vector<uint16_t> fBufHeader;
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138 | vector<uint16_t> fBufFtuList;
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139 | vector<uint16_t> fBufStaticData;
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140 | vector<uint16_t> fBufDynamicData;
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141 |
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142 | vector<uint16_t> fCommand;
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143 | FTM::Header fHeader;
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144 | FTM::FtuList fFtuList;
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145 | FTM::StaticData fStaticData;
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146 | FTM::DynamicData fDynamicData;
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147 |
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148 | //vector<uint16_t> fStaticData;
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149 |
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150 | uint16_t fDelimiter;
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151 | uint16_t fBufRegister;
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152 |
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153 | uint16_t fCounter;
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154 | uint16_t fTimeStamp;
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155 |
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156 | bool fReportsDisabled;
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157 |
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158 | void SendDynamicData()
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159 | {
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160 | if (fReportsDisabled)
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161 | return;
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162 |
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163 | //if (fHeader.fState == FTM::kFtmRunning)
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164 | // fDynamicData.fOnTimeCounter = lrint(Time().UnixTime()-fStartTime);
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165 |
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166 | fDynamicData.fTempSensor[0] = (23. + (6.*rand()/RAND_MAX-3))*10;
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167 | fDynamicData.fTempSensor[1] = (55. + (6.*rand()/RAND_MAX-3))*10;
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168 | fDynamicData.fTempSensor[2] = (39. + (6.*rand()/RAND_MAX-3))*10;
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169 | fDynamicData.fTempSensor[3] = (42. + (6.*rand()/RAND_MAX-3))*10;
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170 |
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171 | for (int i=0; i<40; i++)
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172 | for (int p=0; p<4; p++)
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173 | fDynamicData[i].fRatePatch[p] = (1000 + (float(rand())/RAND_MAX-0.5)*25*p);
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174 |
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175 | fHeader.fType=kDynamicData; // FtuList
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176 | fHeader.fDataSize=sizeof(FTM::DynamicData)/2+1;
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177 | fHeader.fTriggerCounter = fCounter++;
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178 | fHeader.fTimeStamp = fTimeStamp++*1000000;//lrint(Time().UnixTime());
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179 |
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180 | fBufHeader = fHeader.HtoN();
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181 | fBufDynamicData = fDynamicData.HtoN();
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182 |
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183 | AsyncWrite(ba::buffer(ba::const_buffer(&fBufHeader[0], fBufHeader.size()*2)));
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184 | AsyncWrite(ba::buffer(ba::const_buffer(&fBufDynamicData[0], sizeof(FTM::DynamicData))));
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185 | AsyncWrite(ba::buffer(ba::const_buffer(&fDelimiter, 2)));
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186 | }
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187 |
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188 | void SendStaticData()
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189 | {
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190 | fHeader.fType=kStaticData; // FtuList
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191 | fHeader.fDataSize=sizeof(FTM::StaticData)/2+1;
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192 | fHeader.fTriggerCounter = fCounter++;
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193 | fHeader.fTimeStamp = fTimeStamp*1000000;//lrint(Time().UnixTime());
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194 |
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195 | for (int i=0; i<4; i++)
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196 | fFtuList.fActiveFTU[i] = fStaticData.fActiveFTU[i];
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197 |
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198 | fBufHeader = fHeader.HtoN();
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199 | fBufStaticData = fStaticData.HtoN();
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200 |
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201 | AsyncWrite(ba::buffer(ba::const_buffer(&fBufHeader[0], fBufHeader.size()*2)));
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202 | AsyncWrite(ba::buffer(ba::const_buffer(&fBufStaticData[0], fBufStaticData.size()*2)));
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203 | AsyncWrite(ba::buffer(ba::const_buffer(&fDelimiter, 2)));
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204 | }
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205 |
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206 | void HandleReceivedData(const boost::system::error_code& error, size_t bytes_received)
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207 | {
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208 | // Do not schedule a new read if the connection failed.
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209 | if (bytes_received==0)
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210 | {
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211 | // Close the connection
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212 | close();
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213 | return;
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214 | }
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215 |
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216 | // No command received yet
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217 | if (fCommand.size()==0)
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218 | {
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219 | transform(fBufCommand.begin(), fBufCommand.begin()+bytes_received/2,
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220 | fBufCommand.begin(), ntohs);
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221 |
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222 | if (fBufCommand[0]!='@')
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223 | {
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224 | cout << "Inavlid command: 0x" << hex << fBufCommand[0] << dec << endl;
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225 | cout << "Received b=" << bytes_received << ": " << error.message() << " (" << error << ")" << endl;
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226 | cout << "Hex:" << Converter::GetHex<uint16_t>(&fBufCommand[0], bytes_received) << endl;
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227 | return;
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228 | }
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229 |
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230 | switch (fBufCommand[1])
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231 | {
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232 | case kCmdToggleLed:
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233 | cout << "-> TOGGLE_LED" << endl;
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234 |
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235 | fBufCommand.resize(5);
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236 | AsyncRead(ba::buffer(fBufCommand));
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237 | return;
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238 |
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239 | case kCmdPing:
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240 | cout << "-> PING" << endl;
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241 |
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242 | fHeader.fType=kFtuList; // FtuList
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243 | fHeader.fDataSize=sizeof(FTM::FtuList)/2+1;
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244 | fHeader.fTriggerCounter = fCounter++;
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245 | fHeader.fTimeStamp = fTimeStamp*1000000;//lrint(Time().UnixTime());
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246 |
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247 | fFtuList[1].fPingAddr = ((rand()&1)<<9) | 1;
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248 | fFtuList[0].fPingAddr = ((rand()&1)<<8);
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249 |
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250 | fBufHeader = fHeader.HtoN();
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251 | fBufFtuList = fFtuList.HtoN();
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252 |
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253 | AsyncWrite(ba::buffer(ba::const_buffer(&fBufHeader[0], fBufHeader.size()*2)));
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254 | AsyncWrite(ba::buffer(ba::const_buffer(&fBufFtuList[0], fBufFtuList.size()*2)));
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255 | AsyncWrite(ba::buffer(ba::const_buffer(&fDelimiter, 2)));
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256 |
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257 | fBufCommand.resize(5);
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258 | AsyncRead(ba::buffer(fBufCommand));
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259 | return;
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260 |
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261 | case kCmdRead: // kCmdRead
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262 | cout << "-> READ" << endl;
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263 | switch (fBufCommand[2])
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264 | {
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265 | case kCmdStaticData:
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266 | cout << "-> STATIC" << endl;
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267 |
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268 | SendStaticData();
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269 |
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270 | fBufCommand.resize(5);
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271 | AsyncRead(ba::buffer(fBufCommand));
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272 |
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273 | return;
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274 |
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275 | case kCmdDynamicData:
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276 | cout << "-> DYNAMIC" << endl;
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277 |
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278 | SendDynamicData();
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279 |
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280 | fBufCommand.resize(5);
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281 | AsyncRead(ba::buffer(fBufCommand));
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282 |
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283 | return;
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284 |
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285 | case kCmdRegister:
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286 | fCommand = fBufCommand;
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287 | cout << "-> REGISTER" << endl;
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288 |
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289 | fBufCommand.resize(1);
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290 | AsyncRead(ba::buffer(fBufCommand));
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291 | return;
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292 | }
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293 | break;
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294 |
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295 |
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296 | case kCmdWrite:
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297 | switch (fBufCommand[2])
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298 | {
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299 | case kCmdRegister:
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300 | fCommand = fBufCommand;
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301 | cout << "-> REGISTER" << endl;
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302 |
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303 | fBufCommand.resize(2);
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304 | AsyncRead(ba::buffer(fBufCommand));
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305 | return;
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306 |
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307 | case kCmdStaticData:
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308 | fCommand = fBufCommand;
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309 | cout << "-> STATIC DATA" << endl;
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310 |
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311 | fBufCommand.resize(sizeof(StaticData)/2);
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312 | AsyncRead(ba::buffer(fBufCommand));
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313 | return;
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314 | }
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315 | break;
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316 |
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317 | case kCmdDisableReports:
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318 | cout << "-> DISABLE REPORTS " << !fBufCommand[2] << endl;
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319 | fReportsDisabled = !fBufCommand[2];
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320 |
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321 | fBufCommand.resize(5);
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322 | AsyncRead(ba::buffer(fBufCommand));
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323 | return;
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324 |
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325 | case kCmdStartRun:
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326 | fHeader.fState = FTM::kFtmRunning;
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327 |
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328 | fStartTime = Time().UnixTime();
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329 |
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330 | fCounter = 0;
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331 | fTimeStamp = 0;
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332 |
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333 | fBufCommand.resize(5);
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334 | AsyncRead(ba::buffer(fBufCommand));
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335 | return;
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336 |
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337 | case kCmdStopRun:
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338 | fHeader.fState = FTM::kFtmIdle;
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339 |
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340 | fCounter = 0;
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341 | fTimeStamp = 0;
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342 |
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343 | fBufCommand.resize(5);
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344 | AsyncRead(ba::buffer(fBufCommand));
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345 | return;
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346 | }
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347 |
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348 | cout << "Received b=" << bytes_received << ": " << error.message() << " (" << error << ")" << endl;
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349 | cout << "Hex:" << Converter::GetHex<uint16_t>(&fBufCommand[0], bytes_received) << endl;
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350 | return;
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351 | }
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352 |
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353 | // Command data received
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354 |
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355 | // Prepare reception of next command
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356 | switch (fCommand[1])
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357 | {
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358 | case kCmdRead: // kCmdRead
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359 | {
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360 | const uint16_t addr = ntohs(fBufCommand[0]);
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361 | const uint16_t val = reinterpret_cast<uint16_t*>(&fStaticData)[addr];
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362 |
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363 | cout << "-> GET REGISTER[" << addr << "]=" << val << endl;
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364 |
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365 | fHeader.fType=kRegister; // FtuList
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366 | fHeader.fDataSize=2;
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367 | fHeader.fTriggerCounter = fCounter++;
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368 | fHeader.fTimeStamp = fTimeStamp*1000000;//lrint(Time().UnixTime());
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369 |
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370 | fBufHeader = fHeader.HtoN();
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371 | fBufStaticData[addr] = htons(val);
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372 |
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373 | AsyncWrite(ba::buffer(ba::const_buffer(&fBufHeader[0], fBufHeader.size()*2)));
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374 | AsyncWrite(ba::buffer(ba::const_buffer(&fBufStaticData[addr], 2)));
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375 | AsyncWrite(ba::buffer(ba::const_buffer(&fDelimiter, 2)));
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376 | break;
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377 | }
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378 |
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379 | case kCmdWrite:
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380 | switch (fCommand[2])
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381 | {
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382 | case kCmdRegister:
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383 | {
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384 | const uint16_t addr = ntohs(fBufCommand[0]);
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385 | const uint16_t val = ntohs(fBufCommand[1]);
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386 |
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387 | cout << "-> SET REGISTER[" << addr << "]=" << val << endl;
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388 |
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389 | reinterpret_cast<uint16_t*>(&fStaticData)[addr] = val;
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390 | }
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391 | break;
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392 |
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393 | case kCmdStaticData:
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394 | {
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395 | cout << "-> SET STATIC DATA" << endl;
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396 | fStaticData = fBufCommand;
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397 | }
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398 | break;
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399 | }
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400 | break;
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401 | }
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402 |
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403 | fCommand.resize(0);
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404 |
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405 | fBufCommand.resize(5);
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406 | AsyncRead(ba::buffer(fBufCommand));
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407 | }
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408 |
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409 | void SendDynData(const boost::system::error_code &ec)
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410 | {
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411 | if (!is_open())
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412 | {
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413 | // For example: Here we could schedule a new accept if we
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414 | // would not want to allow two connections at the same time.
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415 | return;
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416 | }
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417 |
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418 | if (ec==ba::error::basic_errors::operation_aborted)
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419 | return;
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420 |
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421 | // Check whether the deadline has passed. We compare the deadline
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422 | // against the current time since a new asynchronous operation
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423 | // may have moved the deadline before this actor had a chance
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424 | // to run.
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425 |
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426 | if (fTriggerDynData.expires_at() > ba::deadline_timer::traits_type::now())
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427 | return;
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428 |
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429 | // The deadline has passed.
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430 | SendDynamicData();
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431 |
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432 | AsyncWait(fTriggerDynData, 1, &tcp_connection::SendDynData);
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433 | }
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434 |
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435 | public:
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436 | typedef boost::shared_ptr<tcp_connection> shared_ptr;
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437 |
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438 | static shared_ptr create(ba::io_service& io_service)
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439 | {
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440 | return shared_ptr(new tcp_connection(io_service));
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441 | }
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442 |
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443 | void start()
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444 | {
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445 | // Ownership of buffer must be valid until Handler is called.
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446 |
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447 | // Emit something to be written to the socket
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448 | fBufCommand.resize(5);
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449 | AsyncRead(ba::buffer(fBufCommand));
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450 |
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451 | AsyncWait(fTriggerDynData, 1, &tcp_connection::SendDynData);
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452 |
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453 | // AsyncWrite(ba::buffer(ba::const_buffer(&fHeader, sizeof(FTM::Header))));
|
---|
454 | // AsyncWait(deadline_, 3, &tcp_connection::check_deadline);
|
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455 |
|
---|
456 | }
|
---|
457 | };
|
---|
458 |
|
---|
459 |
|
---|
460 | class tcp_server : public tcp::acceptor
|
---|
461 | {
|
---|
462 | public:
|
---|
463 | tcp_server(ba::io_service& ioservice, int port) :
|
---|
464 | tcp::acceptor(ioservice, tcp::endpoint(tcp::v4(), port))
|
---|
465 |
|
---|
466 | {
|
---|
467 | // We could start listening for more than one connection
|
---|
468 | // here, but since there is only one handler executed each time
|
---|
469 | // it would not make sense. Before one handle_accept is not
|
---|
470 | // finished no new handle_accept will be called.
|
---|
471 | // Workround: Start a new thread in handle_accept
|
---|
472 | start_accept();
|
---|
473 | }
|
---|
474 |
|
---|
475 | private:
|
---|
476 | void start_accept()
|
---|
477 | {
|
---|
478 | cout << "Start accept..." << flush;
|
---|
479 | tcp_connection::shared_ptr new_connection = tcp_connection::create(/*acceptor_.*/io_service());
|
---|
480 |
|
---|
481 | // This will accept a connection without blocking
|
---|
482 | async_accept(*new_connection,
|
---|
483 | boost::bind(&tcp_server::handle_accept,
|
---|
484 | this,
|
---|
485 | new_connection,
|
---|
486 | ba::placeholders::error));
|
---|
487 |
|
---|
488 | cout << "start-done." << endl;
|
---|
489 | }
|
---|
490 |
|
---|
491 | void handle_accept(tcp_connection::shared_ptr new_connection, const boost::system::error_code& error)
|
---|
492 | {
|
---|
493 | // The connection has been accepted and is now ready to use
|
---|
494 |
|
---|
495 | // not installing a new handler will stop run()
|
---|
496 | cout << "Handle accept..." << flush;
|
---|
497 | if (!error)
|
---|
498 | {
|
---|
499 | new_connection->start();
|
---|
500 |
|
---|
501 | // The is now an open connection/server (tcp_connection)
|
---|
502 | // we immediatly schedule another connection
|
---|
503 | // This allowed two client-connection at the same time
|
---|
504 | start_accept();
|
---|
505 | }
|
---|
506 | cout << "handle-done." << endl;
|
---|
507 | }
|
---|
508 | };
|
---|
509 |
|
---|
510 | int main(int argc, const char **argv)
|
---|
511 | {
|
---|
512 | try
|
---|
513 | {
|
---|
514 | ba::io_service io_service;
|
---|
515 |
|
---|
516 | Port = argc==2 ? lexical_cast<int>(argv[1]) : 5000;
|
---|
517 |
|
---|
518 | tcp_server server(io_service, Port);
|
---|
519 | // ba::add_service(io_service, &server);
|
---|
520 | // server.add_service(...);
|
---|
521 | cout << "Run..." << flush;
|
---|
522 |
|
---|
523 | // Calling run() from a single thread ensures no concurrent access
|
---|
524 | // of the handler which are called!!!
|
---|
525 | io_service.run();
|
---|
526 |
|
---|
527 | cout << "end." << endl;
|
---|
528 | }
|
---|
529 | catch (std::exception& e)
|
---|
530 | {
|
---|
531 | std::cerr << e.what() << std::endl;
|
---|
532 | }
|
---|
533 |
|
---|
534 | return 0;
|
---|
535 | }
|
---|
536 | /* ====================== Buffers ===========================
|
---|
537 |
|
---|
538 | char d1[128]; ba::buffer(d1));
|
---|
539 | std::vector<char> d2(128); ba::buffer(d2);
|
---|
540 | boost::array<char, 128> d3; by::buffer(d3);
|
---|
541 |
|
---|
542 | // --------------------------------
|
---|
543 | char d1[128];
|
---|
544 | std::vector<char> d2(128);
|
---|
545 | boost::array<char, 128> d3;
|
---|
546 |
|
---|
547 | boost::array<mutable_buffer, 3> bufs1 = {
|
---|
548 | ba::buffer(d1),
|
---|
549 | ba::buffer(d2),
|
---|
550 | ba::buffer(d3) };
|
---|
551 | sock.read(bufs1);
|
---|
552 |
|
---|
553 | std::vector<const_buffer> bufs2;
|
---|
554 | bufs2.push_back(boost::asio::buffer(d1));
|
---|
555 | bufs2.push_back(boost::asio::buffer(d2));
|
---|
556 | bufs2.push_back(boost::asio::buffer(d3));
|
---|
557 | sock.write(bufs2);
|
---|
558 |
|
---|
559 |
|
---|
560 | // ======================= Read functions =========================
|
---|
561 |
|
---|
562 | ba::async_read_until --> delimiter
|
---|
563 |
|
---|
564 | streambuf buf; // Ensure validity until handler!
|
---|
565 | by::async_read(s, buf, ....);
|
---|
566 |
|
---|
567 | ba::async_read(s, ba:buffer(data, size), handler);
|
---|
568 | // Single buffer
|
---|
569 | boost::asio::async_read(s,
|
---|
570 | ba::buffer(data, size),
|
---|
571 | compl-func --> ba::transfer_at_least(32),
|
---|
572 | handler);
|
---|
573 |
|
---|
574 | // Multiple buffers
|
---|
575 | boost::asio::async_read(s, buffers,
|
---|
576 | compl-func --> boost::asio::transfer_all(),
|
---|
577 | handler);
|
---|
578 | */
|
---|
579 |
|
---|
580 | // ================= Others ===============================
|
---|
581 |
|
---|
582 | /*
|
---|
583 | strand Provides serialised handler execution.
|
---|
584 | work Class to inform the io_service when it has work to do.
|
---|
585 |
|
---|
586 |
|
---|
587 | io_service::
|
---|
588 | dispatch Request the io_service to invoke the given handler.
|
---|
589 | poll Run the io_service's event processing loop to execute ready
|
---|
590 | handlers.
|
---|
591 | poll_one Run the io_service's event processing loop to execute one ready
|
---|
592 | handler.
|
---|
593 | post Request the io_service to invoke the given handler and return
|
---|
594 | immediately.
|
---|
595 | reset Reset the io_service in preparation for a subsequent run()
|
---|
596 | invocation.
|
---|
597 | run Run the io_service's event processing loop.
|
---|
598 | run_one Run the io_service's event processing loop to execute at most
|
---|
599 | one handler.
|
---|
600 | stop Stop the io_service's event processing loop.
|
---|
601 | wrap Create a new handler that automatically dispatches the wrapped
|
---|
602 | handler on the io_service.
|
---|
603 |
|
---|
604 | strand:: The io_service::strand class provides the ability to
|
---|
605 | post and dispatch handlers with the guarantee that none
|
---|
606 | of those handlers will execute concurrently.
|
---|
607 |
|
---|
608 | dispatch Request the strand to invoke the given handler.
|
---|
609 | get_io_service Get the io_service associated with the strand.
|
---|
610 | post Request the strand to invoke the given handler and return
|
---|
611 | immediately.
|
---|
612 | wrap Create a new handler that automatically dispatches the
|
---|
613 | wrapped handler on the strand.
|
---|
614 |
|
---|
615 | work:: The work class is used to inform the io_service when
|
---|
616 | work starts and finishes. This ensures that the io_service's run() function will not exit while work is underway, and that it does exit when there is no unfinished work remaining.
|
---|
617 | get_io_service Get the io_service associated with the work.
|
---|
618 | work Constructor notifies the io_service that work is starting.
|
---|
619 |
|
---|
620 | */
|
---|
621 |
|
---|
622 |
|
---|