3 * UCC (University [of WA] Computer Club) Electronic Accounting System
5 * handler_coke.c - Coke controller code
7 * This file is licenced under the 3-clause BSD Licence. See the file
8 * COPYING for full details.
11 * - Remember, the coke machine echoes your text back to you!
23 #define READ_TIMEOUT 2 // 2 seconds for ReadChar
29 int Coke_InitHandler();
30 int Coke_int_GetSlotStatus(char *Buffer, int Slot);
31 void Coke_int_UpdateSlotStatuses(void);
32 int Coke_CanDispense(int User, int Item);
33 int Coke_DoDispense(int User, int Item);
34 int Writef(const char *Format, ...);
36 int ReadLine(int len, char *output);
39 tHandler gCoke_Handler = {
45 char *gsCoke_SerialPort = "/dev/ttyS0";
47 regex_t gCoke_StatusRegex;
48 int gaCoke_CachedStatus[7];
49 pthread_mutex_t gCoke_Mutex = PTHREAD_MUTEX_INITIALIZER;
52 int Coke_InitHandler()
54 printf("connecting to coke machine...\n");
56 giCoke_SerialFD = InitSerial(gsCoke_SerialPort, 9600);
57 if( giCoke_SerialFD == -1 ) {
58 fprintf(stderr, "ERROR: Unable to open coke serial port ('%s')\n", gsCoke_SerialPort);
61 // Reset the slot names.
62 // - Dunno why this is needed, but the machine plays silly
79 Coke_int_UpdateSlotStatuses();
83 AddPeriodicFunction(Coke_int_UpdateSlotStatuses);
85 CompileRegex(&gCoke_StatusRegex, "^slot\\s+([0-9]+)\\s+([^:]+):([a-zA-Z]+)\\s*", REG_EXTENDED);
89 int Coke_int_GetSlotStatus(char *Buffer, int Slot)
91 regmatch_t matches[4];
95 // Parse status response
96 ret = RunRegex(&gCoke_StatusRegex, Buffer, sizeof(matches)/sizeof(matches[0]), matches, "Bad Response");
102 Buffer[ matches[3].rm_eo ] = '\0';
103 status = &Buffer[ matches[3].rm_so ];
106 printf("Coke_CanDispense: Machine responded slot status '%s'\n", status);
109 if( strcmp(status, "full") == 0 ) {
110 gaCoke_CachedStatus[Slot] = 0; // 0: Avaliiable
114 gaCoke_CachedStatus[Slot] = 1; // 1: Empty
120 * \brief Update the status of all coke slots
121 * \note Uses goto to reduce the chance of the lock being kept
123 void Coke_int_UpdateSlotStatuses(void)
128 if( giCoke_SerialFD == -1 ) return ;
130 pthread_mutex_lock(&gCoke_Mutex);
134 printf("Coke_int_UpdateSlotStatuses: send d7\n");
136 Writef("d7\r\n"); // Update slot statuses
137 if( WaitForColon() ) goto ret;
139 printf("Coke_int_UpdateSlotStatuses: send s\n");
142 ReadLine(sizeof tmp, tmp); // Read back what we just said
144 for( i = 0; i <= 6; i ++ )
146 len = ReadLine(sizeof tmp, tmp);
149 printf("Coke_int_UpdateSlotStatuses: Read failed on slot %i\n", i);
151 goto ret; // I give up :(
154 printf("Coke_int_UpdateSlotStatuses: tmp = '%s'\n", tmp);
156 Coke_int_GetSlotStatus(tmp, i);
160 pthread_mutex_unlock(&gCoke_Mutex);
163 int Coke_CanDispense(int UNUSED(User), int Item)
166 if( Item < 0 || Item > 6 ) return -1; // -EYOURBAD
168 // Can't dispense if the machine is not connected
169 if( giCoke_SerialFD == -1 )
172 return gaCoke_CachedStatus[Item];
176 * \brief Actually do a dispense from the coke machine
178 int Coke_DoDispense(int UNUSED(User), int Item)
184 if( Item < 0 || Item > 6 ) return -1;
186 // Can't dispense if the machine is not connected
187 if( giCoke_SerialFD == -1 )
191 pthread_mutex_lock(&gCoke_Mutex);
194 printf("Coke_DoDispense: flushing input\n");
199 while( WaitForColon() && ret < 3 )
201 // Flush the input buffer
203 read(giCoke_SerialFD, tmpbuf, sizeof(tmpbuf));
205 printf("Coke_DoDispense: sending 'd7'\n");
213 printf("Coke_DoDispense: timed out\n");
215 pthread_mutex_unlock(&gCoke_Mutex);
220 printf("Coke_DoDispense: sending 'd%i'\n", Item);
223 Writef("d%i\r\n", Item);
225 // Read empty lines and echo-backs
227 ret = ReadLine(sizeof(tmp)-1, tmp);
229 pthread_mutex_unlock(&gCoke_Mutex);
233 printf("Coke_DoDispense: read %i '%s'\n", ret, tmp);
235 } while( ret == 0 || tmp[0] == ':' || tmp[0] == 'd' );
237 WaitForColon(); // Eat up rest of response
240 printf("Coke_DoDispense: done\n");
243 // TODO: Regex instead?
244 if( strcmp(tmp, "ok") == 0 ) {
245 // We think dispense worked
246 // - The machine returns 'ok' if an empty slot is dispensed, even if
247 // it doesn't actually try to dispense (no sound)
251 printf("Coke_DoDispense: Machine returned unknown value '%s'\n", tmp);
256 printf("Coke_DoDispense: Updating slot status\n");
259 Writef("s%i\r\n", Item);
260 len = ReadLine(sizeof tmp, tmp);
261 if(len == -1) gaCoke_CachedStatus[Item] = -1;
262 Coke_int_GetSlotStatus(tmp, Item);
264 // Release and return
265 pthread_mutex_unlock(&gCoke_Mutex);
275 struct timeval timeout;
277 timeout.tv_sec = READ_TIMEOUT;
281 FD_SET(giCoke_SerialFD, &readfs);
283 ret = select(giCoke_SerialFD+1, &readfs, NULL, NULL, &timeout);
284 if( ret == 0 ) return 0; // Timeout
286 printf("readchar return %i\n", ret);
290 ret = read(giCoke_SerialFD, &ch, 1);
292 printf("ret = %i\n", ret);
299 int Writef(const char *Format, ...)
304 va_start(args, Format);
305 len = vsnprintf(NULL, 0, Format, args);
310 va_start(args, Format);
311 vsnprintf(buf, len+1, Format, args);
315 printf("Writef: %s", buf);
318 return write(giCoke_SerialFD, buf, len);
328 FD_SET(giCoke_SerialFD, &readfs);
330 while( (ch = ReadChar()) != ':' && ch != 0);
332 if( ch == 0 ) return -1; // Timeout
337 int ReadLine(int len, char *output)
352 if( ch == '\n' || ch == '\r' ) {
359 //printf("ReadLine: output=%s\n", output);