root / trunk / code / projects / traffic_navigation / main-new.c @ 1999
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1 | 1999 | azl | #define MAIN_NEW
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2 | 1969 | azl | /*
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3 | * main.c for Traffic Navigation
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4 | 1988 | bwasserm | * Runs the highest level behavior for the Dynamic Traffic Navigation (DTN) SURG
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5 | 1969 | azl | *
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6 | * Author: Colony Project, CMU Robotics Club
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7 | */
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8 | |||
9 | #include "traffic_navigation.h" |
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10 | #include "../linefollowing/lineDrive.h" |
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11 | 1991 | azl | #define ORB_INTERSECTION
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12 | #define DEBUG_INTERSECTION
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13 | 1988 | bwasserm | #ifdef MAIN_NEW
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14 | 1969 | azl | |
15 | 1988 | bwasserm | #ifdef ORB_INTERSECTION
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16 | #define ORB1_DBG_CLR(color) orb1_set_color(color)
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17 | #define ORB2_DBG_CLR(color) orb2_set_color(color)
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18 | #else
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19 | #define ORB1_DBG_CLR(color)
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20 | #define ORB2_DBG_CLR(color)
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21 | #endif
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22 | |||
23 | #ifdef DEBUG_INTERSECTION
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24 | #define DBG_USBS(str) usb_puts(str)
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25 | #else
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26 | #define DBG_USBS(str)
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27 | #endif
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28 | |||
29 | 1969 | azl | static int state, sign, turnDir; |
30 | static char sendBuffer[PACKET_LENGTH], queuePrevBot, queueNextBot, id, nextDir, nextPath, intersectionNum, resolvPrevBotID = -3; |
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31 | unsigned char resolvSeed = 0xC9, resolvDraw = 0, resolvPrevBotDraw = 0; |
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32 | 1972 | azl | bool done;
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33 | 1969 | azl | |
34 | int wirelessPacketHandle(int state); |
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35 | void enterIntersection(void); |
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36 | void sendResolv(bool override); |
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37 | unsigned char resolvRandomNumberGen(); |
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38 | |||
39 | int main (void) { |
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40 | |||
41 | /* Initialize the dragonfly boards, the xbee, encoders, lineFollowing */
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42 | dragonfly_init(ALL_ON); |
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43 | xbee_init(); |
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44 | encoders_init(); |
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45 | lineDrive_init(); |
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46 | rtc_init(SIXTEENTH_SECOND, NULL);
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47 | wl_basic_init_default(); |
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48 | wl_set_channel(13);
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49 | initializeData(); |
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50 | |||
51 | id = get_robotid(); |
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52 | sign = 0;
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53 | 1988 | bwasserm | ORB1_DBG_CLR(GREEN); |
54 | 1991 | azl | delay_ms(500);
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55 | 1988 | bwasserm | ORB1_DBG_CLR(ORB_OFF); |
56 | 1969 | azl | |
57 | //Test code
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58 | state = SROAD; |
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59 | |||
60 | sendBuffer[1] = id;
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61 | |||
62 | /*
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63 | 1988 | bwasserm | doDrive(180);
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64 | 1969 | azl | turn(DOUBLE, ILEFT);
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65 | */
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66 | /*
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67 | while(1)
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68 | doDrive(255);
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69 | */
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70 | |||
71 | while (1) { |
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72 | 1988 | bwasserm | /*DTN Finite State Machine*/
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73 | 1969 | azl | switch(state){
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74 | case SROAD:/*Following a normal road*/ |
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75 | /* implement other road behaviors?
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76 | * -tailgating
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77 | */
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78 | 1988 | bwasserm | ORB1_DBG_CLR(WHITE); |
79 | ORB2_DBG_CLR(ORB_OFF); |
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80 | 1977 | azl | start(); |
81 | 1972 | azl | done = false;
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82 | while(!done){
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83 | 1988 | bwasserm | sign = doDrive(180);
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84 | 1972 | azl | switch(sign){
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85 | case NORMAL:
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86 | case FINISHED:
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87 | case LOST:
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88 | case ERROR:
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89 | break;
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90 | default:
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91 | //we have a barcode!
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92 | state = SINTERSECTION_ENTER; |
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93 | 1991 | azl | usb_puts("Read Barcode #:");
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94 | usb_puti(sign); |
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95 | usb_putc('\n');
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96 | 1972 | azl | done = true;
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97 | break;
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98 | |||
99 | } |
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100 | 1969 | azl | } |
101 | break;
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102 | case SINTERSECTION_ENTER:/*Entering, and in intersection*/ |
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103 | stop(); |
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104 | doDrive(0);
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105 | 1988 | bwasserm | ORB1_DBG_CLR(RED); |
106 | ORB2_DBG_CLR(ORB_OFF); |
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107 | 1969 | azl | |
108 | 1988 | bwasserm | DBG_USBS("STATE: SINTERSECTION_ENTER\n");
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109 | 1969 | azl | |
110 | /*Intersection queue:
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111 | *Each robot when entering the intersection will check for other robots
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112 | *in the intersection, and insert itself in a queue to go through.
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113 | */
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114 | queuePrevBot = -1; //the bot that will drive before this bot |
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115 | queueNextBot = -1; //the bot that will drive after this bot |
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116 | resolvPrevBotID = -3; //in the case of a race, the bot that is |
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117 | //to enter the queue before this bot
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118 | resolvPrevBotDraw = 0; //the random priority number that bot has |
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119 | resolvDraw = 0; //my random priority number |
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120 | |||
121 | 1972 | azl | intersectionNum = getIntersectNum(sign); |
122 | if(intersectionNum == (char) -1){ //invalid |
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123 | state = SROAD; |
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124 | 1991 | azl | usb_puts("Barcode has invalid intersectionNum\n");
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125 | 1972 | azl | break;
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126 | } |
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127 | turnDir = validateTurn(sign, getTurnType(sign)); |
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128 | if(turnDir == (char) -1){ //invalid |
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129 | state = SROAD; |
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130 | 1991 | azl | usb_puts("Barcode has invalid turn\n");
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131 | 1972 | azl | break;
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132 | } |
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133 | 1969 | azl | |
134 | enterIntersection(); //sends wireless packet for entry
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135 | state = SINTERSECTION_WAIT; |
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136 | |||
137 | rtc_reset(); //reset rtc for timeout wait for reply
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138 | 1972 | azl | done = false;
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139 | 1969 | azl | char retried = 0; |
140 | 1999 | azl | while(rtc_get() < 8 && !done){//waits for a reply, otherwise assumes it is first in queue |
141 | 1969 | azl | int ret = wirelessPacketHandle(SINTERSECTION_ENTER);
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142 | 1999 | azl | if(rtc_get() > 6 && !retried){//by now all resolvs should be done from bots that arrived earlier... |
143 | 1988 | bwasserm | ORB2_DBG_CLR(PURPLE); |
144 | 1969 | azl | enterIntersection(); |
145 | retried = 1;
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146 | } |
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147 | switch (ret) {
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148 | case KPLACEDINQUEUE:
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149 | 1988 | bwasserm | ORB2_DBG_CLR(GREEN); |
150 | 1969 | azl | done = true;
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151 | break;
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152 | case KFAILEDTOQUEUE:
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153 | 1988 | bwasserm | DBG_USBS("Failed to queue\n");
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154 | ORB2_DBG_CLR(RED); |
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155 | 1969 | azl | enterIntersection(); |
156 | rtc_reset(); |
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157 | break;
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158 | case KRESOLVINGENTER:
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159 | |||
160 | 1988 | bwasserm | ORB2_DBG_CLR(ORANGE); |
161 | 1969 | azl | state = SINTERSECTION_ENTER_RESOLV; |
162 | done = true;
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163 | break;
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164 | } |
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165 | } |
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166 | break;
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167 | |||
168 | case SINTERSECTION_ENTER_RESOLV:
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169 | 1988 | bwasserm | ORB1_DBG_CLR(PURPLE); |
170 | ORB2_DBG_CLR(ORB_OFF); |
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171 | DBG_USBS("STATE: SINTERSECTION_ENTER_RESOLV\n");
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172 | 1969 | azl | |
173 | rtc_reset(); |
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174 | done = false;
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175 | retried = 0;
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176 | 1999 | azl | while(rtc_get() < 4 && !done){ |
177 | 1969 | azl | int ret = wirelessPacketHandle(SINTERSECTION_ENTER_RESOLV);
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178 | switch (ret) {
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179 | case KRESOLVINGENTER:
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180 | 1988 | bwasserm | |
181 | ORB2_DBG_CLR(YELLOW); |
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182 | |||
183 | 1969 | azl | break;
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184 | case KPLACEDINQUEUE:
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185 | 1988 | bwasserm | |
186 | ORB2_DBG_CLR(GREEN); |
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187 | |||
188 | 1969 | azl | done = true;
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189 | break;
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190 | case KFAILEDTOQUEUE:
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191 | usb_puts("Failed to queue\n");
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192 | orb2_set_color(RED); |
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193 | enterIntersection(); |
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194 | rtc_reset(); |
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195 | break;
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196 | } |
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197 | //if resolvPrevBotID == -1, this indicates that
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198 | //there was a prevbot before, but it has entered
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199 | //the queue so it's our turn.
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200 | if(!done && resolvPrevBotID == (char) -1 && !retried){ |
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201 | enterIntersection(); |
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202 | rtc_reset(); |
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203 | retried = 1;
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204 | //if resolvPrevBotID == -2, we have been
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205 | //resolving but never have seen a bot with lower
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206 | //priority than us. after the 6/16ths sec
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207 | //timeout, assume we are first.
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208 | 1999 | azl | } else if(!done && resolvPrevBotID == (char) -2 && rtc_get() > 2){ |
209 | 1969 | azl | //send a intersection reply to myself to
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210 | //trigger other bots to enter queue.
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211 | sendBuffer[0] = WINTERSECTIONREPLY;
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212 | sendBuffer[2] = intersectionNum;
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213 | sendBuffer[3] = id;
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214 | wl_basic_send_global_packet(42, sendBuffer, PACKET_LENGTH);
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215 | |||
216 | done = true;
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217 | break;
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218 | } |
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219 | } |
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220 | state = SINTERSECTION_WAIT; |
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221 | break;
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222 | case SINTERSECTION_WAIT:/*Waiting in intersection */ |
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223 | |||
224 | 1988 | bwasserm | ORB1_DBG_CLR(YELLOW); |
225 | ORB2_DBG_CLR(ORB_OFF); |
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226 | |||
227 | DBG_USBS("STATE: SINTERSECTION_WAIT\n");
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228 | |||
229 | 1998 | azl | done = false;
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230 | 1969 | azl | while(queuePrevBot != (char) -1){ |
231 | 1998 | azl | done = true;
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232 | 1969 | azl | int ret = wirelessPacketHandle(state);
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233 | switch (ret){
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234 | case KFIRSTINQUEUE:
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235 | 1988 | bwasserm | |
236 | ORB2_DBG_CLR(GREEN); |
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237 | |||
238 | 1969 | azl | state = SINTERSECTION_DRIVE; |
239 | break;
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240 | case KREPLIEDTOENTER:
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241 | 1988 | bwasserm | |
242 | ORB2_DBG_CLR(BLUE); |
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243 | |||
244 | 1969 | azl | break;
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245 | case KRESOLVINGENTER:
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246 | 1988 | bwasserm | |
247 | ORB2_DBG_CLR(ORANGE); |
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248 | |||
249 | 1969 | azl | break;
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250 | } |
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251 | } |
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252 | 1992 | azl | //hack to make sure bot that just left intersection is
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253 | //really out of the intersection.
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254 | rtc_reset(); |
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255 | 1999 | azl | while(rtc_get() < 2 && done){//wait one second |
256 | 1992 | azl | wirelessPacketHandle(state); |
257 | } |
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258 | |||
259 | 1969 | azl | state = SINTERSECTION_DRIVE; |
260 | break;
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261 | case SINTERSECTION_DRIVE:
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262 | 1988 | bwasserm | DBG_USBS("STATE: SINTERSECTION_DRIVE\n");
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263 | |||
264 | |||
265 | ORB1_DBG_CLR(GREEN); |
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266 | ORB2_DBG_CLR(ORB_OFF); |
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267 | |||
268 | 1969 | azl | start(); |
269 | 1972 | azl | turn(getIntersectType(sign), turnDir); |
270 | 1988 | bwasserm | while(doDrive(180) != FINISHED){ |
271 | 1969 | azl | //while(!button2_click()){
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272 | int ret = wirelessPacketHandle(state);
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273 | switch (ret){
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274 | case KREPLIEDTOENTER:
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275 | 1988 | bwasserm | |
276 | ORB2_DBG_CLR(BLUE); |
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277 | |||
278 | 1969 | azl | break;
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279 | case KRESOLVINGENTER:
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280 | 1988 | bwasserm | |
281 | ORB2_DBG_CLR(ORANGE); |
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282 | |||
283 | 1969 | azl | break;
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284 | } |
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285 | } |
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286 | |||
287 | //Exits intersection
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288 | |||
289 | 1988 | bwasserm | ORB1_DBG_CLR(WHITE); |
290 | |||
291 | |||
292 | 1969 | azl | sendBuffer[0] = WINTERSECTIONEXIT;
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293 | sendBuffer[2] = intersectionNum;//Intersection # |
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294 | wl_basic_send_global_packet(42, sendBuffer, PACKET_LENGTH);
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295 | |||
296 | //Exits intersection
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297 | 1972 | azl | /*
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298 | 1969 | azl | while(1){
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299 | if(button1_click()){
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300 | start();
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301 | state = SHIGHWAY;
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302 | break;
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303 | }
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304 | if(button2_click()){
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305 | start();
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306 | state = SROAD;
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307 | break;
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308 | }
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309 | 1972 | azl | }*/
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310 | state = SROAD; |
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311 | 1969 | azl | break;
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312 | case SHIGHWAY:/*On highway*/ |
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313 | 1988 | bwasserm | |
314 | ORB1_DBG_CLR(CYAN); |
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315 | |||
316 | 1969 | azl | while(!button1_click()){
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317 | highwayFSM(); |
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318 | } |
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319 | state = SINTERSECTION_ENTER; |
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320 | break;
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321 | default:
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322 | usb_puts("I got stuck in an unknown state! My state is ");
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323 | usb_puti(state); |
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324 | } |
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325 | } |
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326 | |||
327 | } |
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328 | |||
329 | int wirelessPacketHandle(int state){ |
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330 | int dataLength = 0; |
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331 | unsigned char *packet = NULL; |
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332 | packet = wl_basic_do_default(&dataLength); |
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333 | |||
334 | /* sanity check */
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335 | if(dataLength == 0 || packet == NULL) //no packet |
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336 | return ENOPACKET;
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337 | |||
338 | if(dataLength != PACKET_LENGTH)
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339 | return EPACKETLEN;
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340 | |||
341 | usb_puts("Recieved Wireless Packet: ");
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342 | for(int i = 0; i < dataLength; i++){ |
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343 | usb_puti(packet[i]); |
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344 | usb_putc(' ');
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345 | } |
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346 | usb_putc('\n');
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347 | |||
348 | switch (packet[0]){ |
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349 | case WROADENTRY: //[type, bot, road] |
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350 | return ENOACTION;
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351 | break;
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352 | case WROADEXIT: //[type, bot, road] |
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353 | return ENOACTION;
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354 | break;
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355 | case WROADSTOP: //[type, bot, road] |
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356 | return ENOACTION;
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357 | break;
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358 | case WINTERSECTIONENTRY: //[type, bot, intersection, fromDir, toDir] |
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359 | if (packet[2] == intersectionNum){ |
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360 | switch (state){
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361 | case SINTERSECTION_ENTER:
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362 | sendResolv(false);
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363 | resolvPrevBotID = -2;
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364 | return KRESOLVINGENTER;
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365 | break;
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366 | case SINTERSECTION_ENTER_RESOLV:
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367 | return ENOACTION;
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368 | case SINTERSECTION_WAIT:
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369 | case SINTERSECTION_DRIVE:
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370 | if(queueNextBot == (char) -1){ |
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371 | sendBuffer[0] = WINTERSECTIONREPLY;
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372 | sendBuffer[2] = intersectionNum;
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373 | sendBuffer[3] = packet[1]; |
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374 | wl_basic_send_global_packet(42, sendBuffer, PACKET_LENGTH);
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375 | queueNextBot = packet[1];
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376 | return KREPLIEDTOENTER;
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377 | } |
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378 | break;
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379 | |||
380 | } |
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381 | } |
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382 | break;
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383 | case WINTERSECTIONREPLY: //[type, fromBot, intersection, toBot] |
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384 | if (packet[2] == intersectionNum){ |
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385 | switch (state){
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386 | case SINTERSECTION_ENTER:
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387 | case SINTERSECTION_ENTER_RESOLV:
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388 | if(packet[3] == id){ //Reply for me |
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389 | queuePrevBot = packet[1];
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390 | return KPLACEDINQUEUE;
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391 | } else {
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392 | if(packet[3] == resolvPrevBotID) |
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393 | resolvPrevBotID = -1;
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394 | return KFAILEDTOQUEUE;
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395 | } |
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396 | break;
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397 | default:
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398 | return ENOACTION;
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399 | } |
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400 | } |
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401 | break;
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402 | case WINTERSECTIONEXIT: //[type, bot, intersection] |
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403 | if (packet[2] == intersectionNum){ |
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404 | switch (state){
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405 | case SINTERSECTION_WAIT:
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406 | if(packet[1]==queuePrevBot){ |
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407 | queuePrevBot=-1;
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408 | return KFIRSTINQUEUE;
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409 | } |
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410 | } |
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411 | } |
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412 | break;
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413 | case WINTERSECTIONGO: //[type, bot, intersection] |
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414 | break;
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415 | case WINTERSECTIONPOLICEENTRY: //[?] |
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416 | return ENOACTION;
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417 | break;
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418 | case WINTERSECTIONRESOLVERACE: //[type, bot, intersection, num] |
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419 | //in the case robots draw the same number these will be
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420 | //arbitrated using the sending robot's id, prefering
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421 | //lower ids
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422 | usb_puts("Now in wireless WINTERSECTIONRESOLVERACE handler: resolvPrevBotID: ");
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423 | usb_puti((int) resolvPrevBotID);
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424 | usb_putc('\n');
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425 | if (packet[2] == intersectionNum){ |
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426 | switch (state){
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427 | case SINTERSECTION_ENTER:
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428 | case SINTERSECTION_ENTER_RESOLV:
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429 | if(resolvPrevBotID == (char) -3){ |
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430 | usb_puts("resolvPrevBotID == -3; sending a resolv packet and setting to -2\n");
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431 | sendResolv(false);
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432 | resolvPrevBotID = -2;
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433 | } |
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434 | if((unsigned char) packet[3] == resolvDraw && id > packet[1]){ |
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435 | //other bot drew same number as me,
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436 | //and i have a higher id, so it goes first.
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437 | usb_puts("bot ");
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438 | usb_puti(packet[1]);
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439 | usb_puts(" Drew the same number as me and I have a higher id, so it goes first\n");
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440 | resolvPrevBotID = packet[1];
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441 | } else if((unsigned char) packet[3] == resolvPrevBotDraw && resolvPrevBotID > packet[1]){ |
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442 | //other bot drew same number as the bot before me,
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443 | //so if it has a higher id than the bot before me,
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444 | //it is going to go in between that one and me.
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445 | usb_puts("bot ");
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446 | usb_puti(packet[1]);
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447 | usb_puts(" Drew the same number as the bot before me, and the bot before me has have a higher id, so this goes first\n");
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448 | resolvPrevBotID = packet[1];
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449 | } else if((unsigned char)packet[3] < resolvDraw && (unsigned char)packet[3] > resolvPrevBotDraw){ |
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450 | //found a bot that goes in between the bot before me
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451 | //and me, so now it is before me.
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452 | usb_puts("bot ");
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453 | usb_puti(packet[1]);
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454 | usb_puts(" Drew a lower number bot before me, and the bot before me has have a higher id, so this goes first\n");
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455 | resolvPrevBotDraw = packet[3];
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456 | resolvPrevBotID = packet[1];
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457 | } |
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458 | return KRESOLVINGENTER;
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459 | break;
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460 | case SINTERSECTION_WAIT:
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461 | case SINTERSECTION_DRIVE:
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462 | usb_puts("Trying to resolv in non resolv case...queueNextbot = "); usb_puti(queueNextBot); usb_puts("\n"); |
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463 | if(queueNextBot == (char) -1){ |
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464 | sendResolv(true);
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465 | } |
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466 | return KRESOLVINGENTER;
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467 | break;
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468 | } |
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469 | |||
470 | } |
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471 | break;
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472 | case WHIGHWAYENTRY: //[type, bot, highway] |
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473 | return ENOACTION;
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474 | break;
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475 | case WHIGHWAYREPLY: //[type, fromBot, highway, toBot] |
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476 | return ENOACTION;
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477 | break;
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478 | case WHIGHWAYEXIT: //[type, bot, highway] |
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479 | return ENOACTION;
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480 | break;
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481 | case WPINGGLOBAL: //[type, bot] |
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482 | return ENOACTION;
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483 | break;
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484 | case WPINGBOT: //[type, fromBot, toBot] |
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485 | return ENOACTION;
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486 | break;
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487 | case WPINGQUEUE: //[type, fromBot, toBot] |
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488 | return ENOACTION;
|
||
489 | break;
|
||
490 | case WPINGREPLY: //[type, fromBot, toBot] |
||
491 | return ENOACTION;
|
||
492 | break;
|
||
493 | case WCOLLISIONAVOID: //[type, bot, intersection, collision-int] //Note: collision is an int and thus takes two spaces |
||
494 | return ENOACTION;
|
||
495 | break;
|
||
496 | default:
|
||
497 | return ENOACTION;
|
||
498 | break;
|
||
499 | } |
||
500 | } |
||
501 | |||
502 | unsigned char resolvRandomNumberGen(){ |
||
503 | 1991 | azl | if ((resolvSeed *= (rtc_get() + encoder_read(LEFT))%9) == 0){ |
504 | 1969 | azl | return resolvSeed + 1; //0 is a reseved priority value for the last |
505 | //bot that is already in the queue.
|
||
506 | } |
||
507 | return resolvSeed;
|
||
508 | } |
||
509 | void sendResolv(bool override){ |
||
510 | if(!override)
|
||
511 | resolvDraw = resolvRandomNumberGen(); |
||
512 | else
|
||
513 | resolvDraw = 0;
|
||
514 | sendBuffer[0] = WINTERSECTIONRESOLVERACE;
|
||
515 | sendBuffer[2] = intersectionNum;
|
||
516 | sendBuffer[3] = resolvDraw;
|
||
517 | wl_basic_send_global_packet(42, sendBuffer, PACKET_LENGTH);
|
||
518 | } |
||
519 | void enterIntersection(void){ |
||
520 | //Sends packet announcing its entry to the intersection
|
||
521 | sendBuffer[0] = WINTERSECTIONENTRY;
|
||
522 | sendBuffer[2] = intersectionNum;//Intersection # |
||
523 | sendBuffer[3] = 0; //getIntersectPos(sign); |
||
524 | sendBuffer[4] = turnDir;
|
||
525 | wl_basic_send_global_packet(42, sendBuffer, PACKET_LENGTH);
|
||
526 | } |
||
527 | 1988 | bwasserm | |
528 | 1969 | azl | #endif |