6 /*========== basic types etc. ==========*/
8 typedef unsigned short TrainNum;
9 typedef unsigned short SegmentNum;
10 typedef unsigned short LocationNum;
11 typedef unsigned short MovPosComb;
12 typedef unsigned char Small;
13 typedef short TimeInterval;
14 typedef short Distance;
15 typedef char Speed; /* non-negative, units of 4mm/s */
17 /*========== state of the layout ==========*/
20 SegmentNum foredetect; /* train's detectable part is at most maxinto */
21 Distance maxinto, uncertainty; /* into foredetect but train may be */
22 unsigned /* uncertainty less far advanced */
23 backwards:1; /* train is moving backwards wrt its own front and back */
29 owned:1, /* this track segment is reserved for a train */
30 tr_backwards:1, /* train's motion is (would be) backwards wrt track */
31 movfeat_moving:1, /* feature(s) have been told to change to movposcomb */
32 cm_autostop:1, /* train should stop on detection */
33 seg_inverted:1, /* polarity is inverted */
34 tr_updated:1; /* for use by safety.c:lay_train etc.; otherwise 0 */
35 TimeInterval until_here, /* ) nonnegative; */ /* ) always valid but */
36 until_detect; /* ) 0 if already */ /* ) only meaningful */
37 TrainNum owner; /* ) iff owned */
38 MovPosComb movposcomb;
43 unsigned next_backwards:1;
54 SegmentLinkInfo backwards, forwards;
60 unsigned invertible:1;
62 const MovFeatInfo *movfeats;
63 MovPosComb n_poscombs;
64 const SegPosCombInfo *poscombs;
69 Distance tail, detectable, head;
73 extern const TrainInfo info_trains[NUM_TRAINS];
74 extern const SegmentInfo info_segments[NUM_SEGMENTS];
77 TrainState trains[NUM_TRAINS];
78 SegmentState segments[NUM_SEGMENTS];
83 /*========== safety.c ==========*/
85 * safety.c is responsible for ensuring that things don't go
86 * physically wrong (eg, collisions, derailments, short circuits,
90 void safety_emergencystop(TranNum);
91 /* Callable directly in response to application command. */
93 void safety_requestspeed(TrainNum tran, long newspeed);
94 /* To be called only by the speed manager, thus indirectly from
96 * Will result in a call to speedmanager_speedchange_notify (and of
97 * course to actual_setspeed. Speed manager must apply accel/decel
98 * curve so that if safety.c agrees the command, the actual speed of
99 * the train changes straight away (at least for decel).
102 void safety_notify_detection(SegmentNum segn);
103 /* To be called by actual.c when new train detection occurs. */
105 /*========== speedmgr.c ==========*/
107 void speedmanager_speedchange_notify(TrainNum tran);
108 /* To be called only by safety.c, whenever speed is actually set.
109 * New speed has already been recorded in State. */
111 /*========== actual.c ==========*/
112 /* actual.c should only be called from safety.c.
113 * It is responsible for communicating with the PICs, including
114 * repeating the NMRA commands and redacting detection information.
116 * In general, when State information is shared between actual.c
117 * and safety.c, actual.c is responsible for modifying State, and
118 * will then call an actual_... function to notify the change.
121 void actual_setspeed(TrainNum tran);
123 void actual_inversions_start(void);
124 void actual_inversions_segment(SegmentNum);
125 void actual_inversions_done(void);
126 /* safety.c will call these in this order: first start, then segment
127 * for 0 or more segments (whose inversion may or may not have
128 * changed), and finally done. At done, the PICs should be told to
129 * (de)invert the segments as specified.
134 * Entrypoints are: Called from, and as a result of:
135 * actual_setspeed safety.c
136 * actual_emergencystop safety.c
139 /*========== utils.c ==========*/
141 typedef struct TrackLocation TrackLocation;
142 struct TrackLocation { /* transparent, and manipulable by trackloc_... fns */
143 SegmentNum segn; /* current segment */
144 long into; /* distance from start of segment */
145 unsigned backwards:1; /* if 1, into is positive and measured from end */
148 long trackloc_remaininseg(const TrackLocation *tloc);
149 /* Returns dist that tloc can advance before it goes into next segment. */
151 void trackloc_further(TrackLocation *tloc, long *remain_io);
152 /* Advances tloc, decrementing *remain_io, until either
153 * *remain_io becomes zero, or tloc->segn changes. */
155 void trackloc_reverse(TrackLocation *tloc);
156 /* Reverses tloc without changing its actual location. */
158 const SegmentLinkInfo *trackloc_segmentlink_near(const TrackLocation *tloc);
159 const SegmentLinkInfo *trackloc_segmentlink_far(const TrackLocation *tloc);