2 FreeRTOS V7.2.0 - Copyright (C) 2012 Real Time Engineers Ltd.
\r
5 ***************************************************************************
\r
7 * FreeRTOS tutorial books are available in pdf and paperback. *
\r
8 * Complete, revised, and edited pdf reference manuals are also *
\r
11 * Purchasing FreeRTOS documentation will not only help you, by *
\r
12 * ensuring you get running as quickly as possible and with an *
\r
13 * in-depth knowledge of how to use FreeRTOS, it will also help *
\r
14 * the FreeRTOS project to continue with its mission of providing *
\r
15 * professional grade, cross platform, de facto standard solutions *
\r
16 * for microcontrollers - completely free of charge! *
\r
18 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
\r
20 * Thank you for using FreeRTOS, and thank you for your support! *
\r
22 ***************************************************************************
\r
25 This file is part of the FreeRTOS distribution.
\r
27 FreeRTOS is free software; you can redistribute it and/or modify it under
\r
28 the terms of the GNU General Public License (version 2) as published by the
\r
29 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
\r
30 >>>NOTE<<< The modification to the GPL is included to allow you to
\r
31 distribute a combined work that includes FreeRTOS without being obliged to
\r
32 provide the source code for proprietary components outside of the FreeRTOS
\r
33 kernel. FreeRTOS is distributed in the hope that it will be useful, but
\r
34 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
\r
35 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
\r
36 more details. You should have received a copy of the GNU General Public
\r
37 License and the FreeRTOS license exception along with FreeRTOS; if not it
\r
38 can be viewed here: http://www.freertos.org/a00114.html and also obtained
\r
39 by writing to Richard Barry, contact details for whom are available on the
\r
44 ***************************************************************************
\r
46 * Having a problem? Start by reading the FAQ "My application does *
\r
47 * not run, what could be wrong? *
\r
49 * http://www.FreeRTOS.org/FAQHelp.html *
\r
51 ***************************************************************************
\r
54 http://www.FreeRTOS.org - Documentation, training, latest information,
\r
55 license and contact details.
\r
57 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
\r
58 including FreeRTOS+Trace - an indispensable productivity tool.
\r
60 Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
\r
61 the code with commercial support, indemnification, and middleware, under
\r
62 the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
\r
63 provide a safety engineered and independently SIL3 certified version under
\r
64 the SafeRTOS brand: http://www.SafeRTOS.com.
\r
67 /* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
\r
68 all the API functions to use the MPU wrappers. That should only be done when
\r
69 task.h is included from an application file. */
\r
70 #define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
\r
72 #include "FreeRTOS.h"
\r
77 #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
\r
79 /* This entire source file will be skipped if the application is not configured
\r
80 to include software timer functionality. This #if is closed at the very bottom
\r
81 of this file. If you want to include software timer functionality then ensure
\r
82 configUSE_TIMERS is set to 1 in FreeRTOSConfig.h. */
\r
83 #if ( configUSE_TIMERS == 1 )
\r
85 /* Misc definitions. */
\r
86 #define tmrNO_DELAY ( portTickType ) 0U
\r
88 /* The definition of the timers themselves. */
\r
89 typedef struct tmrTimerControl
\r
91 const signed char *pcTimerName; /*<< Text name. This is not used by the kernel, it is included simply to make debugging easier. */
\r
92 xListItem xTimerListItem; /*<< Standard linked list item as used by all kernel features for event management. */
\r
93 portTickType xTimerPeriodInTicks;/*<< How quickly and often the timer expires. */
\r
94 unsigned portBASE_TYPE uxAutoReload; /*<< Set to pdTRUE if the timer should be automatically restarted once expired. Set to pdFALSE if the timer is, in effect, a one shot timer. */
\r
95 void *pvTimerID; /*<< An ID to identify the timer. This allows the timer to be identified when the same callback is used for multiple timers. */
\r
96 tmrTIMER_CALLBACK pxCallbackFunction; /*<< The function that will be called when the timer expires. */
\r
99 /* The definition of messages that can be sent and received on the timer
\r
101 typedef struct tmrTimerQueueMessage
\r
103 portBASE_TYPE xMessageID; /*<< The command being sent to the timer service task. */
\r
104 portTickType xMessageValue; /*<< An optional value used by a subset of commands, for example, when changing the period of a timer. */
\r
105 xTIMER * pxTimer; /*<< The timer to which the command will be applied. */
\r
109 /* The list in which active timers are stored. Timers are referenced in expire
\r
110 time order, with the nearest expiry time at the front of the list. Only the
\r
111 timer service task is allowed to access xActiveTimerList. */
\r
112 PRIVILEGED_DATA static xList xActiveTimerList1;
\r
113 PRIVILEGED_DATA static xList xActiveTimerList2;
\r
114 PRIVILEGED_DATA static xList *pxCurrentTimerList;
\r
115 PRIVILEGED_DATA static xList *pxOverflowTimerList;
\r
117 /* A queue that is used to send commands to the timer service task. */
\r
118 PRIVILEGED_DATA static xQueueHandle xTimerQueue = NULL;
\r
120 #if ( INCLUDE_xTimerGetTimerDaemonTaskHandle == 1 )
\r
122 PRIVILEGED_DATA static xTaskHandle xTimerTaskHandle = NULL;
\r
126 /*-----------------------------------------------------------*/
\r
129 * Initialise the infrastructure used by the timer service task if it has not
\r
130 * been initialised already.
\r
132 static void prvCheckForValidListAndQueue( void ) PRIVILEGED_FUNCTION;
\r
135 * The timer service task (daemon). Timer functionality is controlled by this
\r
136 * task. Other tasks communicate with the timer service task using the
\r
137 * xTimerQueue queue.
\r
139 static void prvTimerTask( void *pvParameters ) PRIVILEGED_FUNCTION;
\r
142 * Called by the timer service task to interpret and process a command it
\r
143 * received on the timer queue.
\r
145 static void prvProcessReceivedCommands( void ) PRIVILEGED_FUNCTION;
\r
148 * Insert the timer into either xActiveTimerList1, or xActiveTimerList2,
\r
149 * depending on if the expire time causes a timer counter overflow.
\r
151 static portBASE_TYPE prvInsertTimerInActiveList( xTIMER *pxTimer, portTickType xNextExpiryTime, portTickType xTimeNow, portTickType xCommandTime ) PRIVILEGED_FUNCTION;
\r
154 * An active timer has reached its expire time. Reload the timer if it is an
\r
155 * auto reload timer, then call its callback.
\r
157 static void prvProcessExpiredTimer( portTickType xNextExpireTime, portTickType xTimeNow ) PRIVILEGED_FUNCTION;
\r
160 * The tick count has overflowed. Switch the timer lists after ensuring the
\r
161 * current timer list does not still reference some timers.
\r
163 static void prvSwitchTimerLists( portTickType xLastTime ) PRIVILEGED_FUNCTION;
\r
166 * Obtain the current tick count, setting *pxTimerListsWereSwitched to pdTRUE
\r
167 * if a tick count overflow occurred since prvSampleTimeNow() was last called.
\r
169 static portTickType prvSampleTimeNow( portBASE_TYPE *pxTimerListsWereSwitched ) PRIVILEGED_FUNCTION;
\r
172 * If the timer list contains any active timers then return the expire time of
\r
173 * the timer that will expire first and set *pxListWasEmpty to false. If the
\r
174 * timer list does not contain any timers then return 0 and set *pxListWasEmpty
\r
177 static portTickType prvGetNextExpireTime( portBASE_TYPE *pxListWasEmpty ) PRIVILEGED_FUNCTION;
\r
180 * If a timer has expired, process it. Otherwise, block the timer service task
\r
181 * until either a timer does expire or a command is received.
\r
183 static void prvProcessTimerOrBlockTask( portTickType xNextExpireTime, portBASE_TYPE xListWasEmpty ) PRIVILEGED_FUNCTION;
\r
185 /*-----------------------------------------------------------*/
\r
187 portBASE_TYPE xTimerCreateTimerTask( void )
\r
189 portBASE_TYPE xReturn = pdFAIL;
\r
191 /* This function is called when the scheduler is started if
\r
192 configUSE_TIMERS is set to 1. Check that the infrastructure used by the
\r
193 timer service task has been created/initialised. If timers have already
\r
194 been created then the initialisation will already have been performed. */
\r
195 prvCheckForValidListAndQueue();
\r
197 if( xTimerQueue != NULL )
\r
199 #if ( INCLUDE_xTimerGetTimerDaemonTaskHandle == 1 )
\r
201 /* Create the timer task, storing its handle in xTimerTaskHandle so
\r
202 it can be returned by the xTimerGetTimerDaemonTaskHandle() function. */
\r
203 xReturn = xTaskCreate( prvTimerTask, ( const signed char * ) "Tmr Svc", ( unsigned short ) configTIMER_TASK_STACK_DEPTH, NULL, ( ( unsigned portBASE_TYPE ) configTIMER_TASK_PRIORITY ) | portPRIVILEGE_BIT, &xTimerTaskHandle );
\r
207 /* Create the timer task without storing its handle. */
\r
208 xReturn = xTaskCreate( prvTimerTask, ( const signed char * ) "Tmr Svc", ( unsigned short ) configTIMER_TASK_STACK_DEPTH, NULL, ( ( unsigned portBASE_TYPE ) configTIMER_TASK_PRIORITY ) | portPRIVILEGE_BIT, NULL);
\r
213 configASSERT( xReturn );
\r
216 /*-----------------------------------------------------------*/
\r
218 xTimerHandle xTimerCreate( const signed char *pcTimerName, portTickType xTimerPeriodInTicks, unsigned portBASE_TYPE uxAutoReload, void *pvTimerID, tmrTIMER_CALLBACK pxCallbackFunction )
\r
220 xTIMER *pxNewTimer;
\r
222 /* Allocate the timer structure. */
\r
223 if( xTimerPeriodInTicks == ( portTickType ) 0U )
\r
226 configASSERT( ( xTimerPeriodInTicks > 0 ) );
\r
230 pxNewTimer = ( xTIMER * ) pvPortMalloc( sizeof( xTIMER ) );
\r
231 if( pxNewTimer != NULL )
\r
233 /* Ensure the infrastructure used by the timer service task has been
\r
234 created/initialised. */
\r
235 prvCheckForValidListAndQueue();
\r
237 /* Initialise the timer structure members using the function parameters. */
\r
238 pxNewTimer->pcTimerName = pcTimerName;
\r
239 pxNewTimer->xTimerPeriodInTicks = xTimerPeriodInTicks;
\r
240 pxNewTimer->uxAutoReload = uxAutoReload;
\r
241 pxNewTimer->pvTimerID = pvTimerID;
\r
242 pxNewTimer->pxCallbackFunction = pxCallbackFunction;
\r
243 vListInitialiseItem( &( pxNewTimer->xTimerListItem ) );
\r
245 traceTIMER_CREATE( pxNewTimer );
\r
249 traceTIMER_CREATE_FAILED();
\r
253 return ( xTimerHandle ) pxNewTimer;
\r
255 /*-----------------------------------------------------------*/
\r
257 portBASE_TYPE xTimerGenericCommand( xTimerHandle xTimer, portBASE_TYPE xCommandID, portTickType xOptionalValue, signed portBASE_TYPE *pxHigherPriorityTaskWoken, portTickType xBlockTime )
\r
259 portBASE_TYPE xReturn = pdFAIL;
\r
260 xTIMER_MESSAGE xMessage;
\r
262 /* Send a message to the timer service task to perform a particular action
\r
263 on a particular timer definition. */
\r
264 if( xTimerQueue != NULL )
\r
266 /* Send a command to the timer service task to start the xTimer timer. */
\r
267 xMessage.xMessageID = xCommandID;
\r
268 xMessage.xMessageValue = xOptionalValue;
\r
269 xMessage.pxTimer = ( xTIMER * ) xTimer;
\r
271 if( pxHigherPriorityTaskWoken == NULL )
\r
273 if( xTaskGetSchedulerState() == taskSCHEDULER_RUNNING )
\r
275 xReturn = xQueueSendToBack( xTimerQueue, &xMessage, xBlockTime );
\r
279 xReturn = xQueueSendToBack( xTimerQueue, &xMessage, tmrNO_DELAY );
\r
284 xReturn = xQueueSendToBackFromISR( xTimerQueue, &xMessage, pxHigherPriorityTaskWoken );
\r
287 traceTIMER_COMMAND_SEND( xTimer, xCommandID, xOptionalValue, xReturn );
\r
292 /*-----------------------------------------------------------*/
\r
294 #if ( INCLUDE_xTimerGetTimerDaemonTaskHandle == 1 )
\r
296 xTaskHandle xTimerGetTimerDaemonTaskHandle( void )
\r
298 /* If xTimerGetTimerDaemonTaskHandle() is called before the scheduler has been
\r
299 started, then xTimerTaskHandle will be NULL. */
\r
300 configASSERT( ( xTimerTaskHandle != NULL ) );
\r
301 return xTimerTaskHandle;
\r
305 /*-----------------------------------------------------------*/
\r
307 static void prvProcessExpiredTimer( portTickType xNextExpireTime, portTickType xTimeNow )
\r
310 portBASE_TYPE xResult;
\r
312 /* Remove the timer from the list of active timers. A check has already
\r
313 been performed to ensure the list is not empty. */
\r
314 pxTimer = ( xTIMER * ) listGET_OWNER_OF_HEAD_ENTRY( pxCurrentTimerList );
\r
315 uxListRemove( &( pxTimer->xTimerListItem ) );
\r
316 traceTIMER_EXPIRED( pxTimer );
\r
318 /* If the timer is an auto reload timer then calculate the next
\r
319 expiry time and re-insert the timer in the list of active timers. */
\r
320 if( pxTimer->uxAutoReload == ( unsigned portBASE_TYPE ) pdTRUE )
\r
322 /* This is the only time a timer is inserted into a list using
\r
323 a time relative to anything other than the current time. It
\r
324 will therefore be inserted into the correct list relative to
\r
325 the time this task thinks it is now, even if a command to
\r
326 switch lists due to a tick count overflow is already waiting in
\r
327 the timer queue. */
\r
328 if( prvInsertTimerInActiveList( pxTimer, ( xNextExpireTime + pxTimer->xTimerPeriodInTicks ), xTimeNow, xNextExpireTime ) == pdTRUE )
\r
330 /* The timer expired before it was added to the active timer
\r
331 list. Reload it now. */
\r
332 xResult = xTimerGenericCommand( pxTimer, tmrCOMMAND_START, xNextExpireTime, NULL, tmrNO_DELAY );
\r
333 configASSERT( xResult );
\r
338 /* Call the timer callback. */
\r
339 pxTimer->pxCallbackFunction( ( xTimerHandle ) pxTimer );
\r
341 /*-----------------------------------------------------------*/
\r
343 static void prvTimerTask( void *pvParameters )
\r
345 portTickType xNextExpireTime;
\r
346 portBASE_TYPE xListWasEmpty;
\r
348 /* Just to avoid compiler warnings. */
\r
349 ( void ) pvParameters;
\r
353 /* Query the timers list to see if it contains any timers, and if so,
\r
354 obtain the time at which the next timer will expire. */
\r
355 xNextExpireTime = prvGetNextExpireTime( &xListWasEmpty );
\r
357 /* If a timer has expired, process it. Otherwise, block this task
\r
358 until either a timer does expire, or a command is received. */
\r
359 prvProcessTimerOrBlockTask( xNextExpireTime, xListWasEmpty );
\r
361 /* Empty the command queue. */
\r
362 prvProcessReceivedCommands();
\r
365 /*-----------------------------------------------------------*/
\r
367 static void prvProcessTimerOrBlockTask( portTickType xNextExpireTime, portBASE_TYPE xListWasEmpty )
\r
369 portTickType xTimeNow;
\r
370 portBASE_TYPE xTimerListsWereSwitched;
\r
374 /* Obtain the time now to make an assessment as to whether the timer
\r
375 has expired or not. If obtaining the time causes the lists to switch
\r
376 then don't process this timer as any timers that remained in the list
\r
377 when the lists were switched will have been processed within the
\r
378 prvSampelTimeNow() function. */
\r
379 xTimeNow = prvSampleTimeNow( &xTimerListsWereSwitched );
\r
380 if( xTimerListsWereSwitched == pdFALSE )
\r
382 /* The tick count has not overflowed, has the timer expired? */
\r
383 if( ( xListWasEmpty == pdFALSE ) && ( xNextExpireTime <= xTimeNow ) )
\r
386 prvProcessExpiredTimer( xNextExpireTime, xTimeNow );
\r
390 /* The tick count has not overflowed, and the next expire
\r
391 time has not been reached yet. This task should therefore
\r
392 block to wait for the next expire time or a command to be
\r
393 received - whichever comes first. The following line cannot
\r
394 be reached unless xNextExpireTime > xTimeNow, except in the
\r
395 case when the current timer list is empty. */
\r
396 vQueueWaitForMessageRestricted( xTimerQueue, ( xNextExpireTime - xTimeNow ) );
\r
398 if( xTaskResumeAll() == pdFALSE )
\r
400 /* Yield to wait for either a command to arrive, or the block time
\r
401 to expire. If a command arrived between the critical section being
\r
402 exited and this yield then the yield will not cause the task
\r
404 portYIELD_WITHIN_API();
\r
414 /*-----------------------------------------------------------*/
\r
416 static portTickType prvGetNextExpireTime( portBASE_TYPE *pxListWasEmpty )
\r
418 portTickType xNextExpireTime;
\r
420 /* Timers are listed in expiry time order, with the head of the list
\r
421 referencing the task that will expire first. Obtain the time at which
\r
422 the timer with the nearest expiry time will expire. If there are no
\r
423 active timers then just set the next expire time to 0. That will cause
\r
424 this task to unblock when the tick count overflows, at which point the
\r
425 timer lists will be switched and the next expiry time can be
\r
427 *pxListWasEmpty = listLIST_IS_EMPTY( pxCurrentTimerList );
\r
428 if( *pxListWasEmpty == pdFALSE )
\r
430 xNextExpireTime = listGET_ITEM_VALUE_OF_HEAD_ENTRY( pxCurrentTimerList );
\r
434 /* Ensure the task unblocks when the tick count rolls over. */
\r
435 xNextExpireTime = ( portTickType ) 0U;
\r
438 return xNextExpireTime;
\r
440 /*-----------------------------------------------------------*/
\r
442 static portTickType prvSampleTimeNow( portBASE_TYPE *pxTimerListsWereSwitched )
\r
444 portTickType xTimeNow;
\r
445 PRIVILEGED_DATA static portTickType xLastTime = ( portTickType ) 0U;
\r
447 xTimeNow = xTaskGetTickCount();
\r
449 if( xTimeNow < xLastTime )
\r
451 prvSwitchTimerLists( xLastTime );
\r
452 *pxTimerListsWereSwitched = pdTRUE;
\r
456 *pxTimerListsWereSwitched = pdFALSE;
\r
459 xLastTime = xTimeNow;
\r
463 /*-----------------------------------------------------------*/
\r
465 static portBASE_TYPE prvInsertTimerInActiveList( xTIMER *pxTimer, portTickType xNextExpiryTime, portTickType xTimeNow, portTickType xCommandTime )
\r
467 portBASE_TYPE xProcessTimerNow = pdFALSE;
\r
469 listSET_LIST_ITEM_VALUE( &( pxTimer->xTimerListItem ), xNextExpiryTime );
\r
470 listSET_LIST_ITEM_OWNER( &( pxTimer->xTimerListItem ), pxTimer );
\r
472 if( xNextExpiryTime <= xTimeNow )
\r
474 /* Has the expiry time elapsed between the command to start/reset a
\r
475 timer was issued, and the time the command was processed? */
\r
476 if( ( ( portTickType ) ( xTimeNow - xCommandTime ) ) >= pxTimer->xTimerPeriodInTicks )
\r
478 /* The time between a command being issued and the command being
\r
479 processed actually exceeds the timers period. */
\r
480 xProcessTimerNow = pdTRUE;
\r
484 vListInsert( pxOverflowTimerList, &( pxTimer->xTimerListItem ) );
\r
489 if( ( xTimeNow < xCommandTime ) && ( xNextExpiryTime >= xCommandTime ) )
\r
491 /* If, since the command was issued, the tick count has overflowed
\r
492 but the expiry time has not, then the timer must have already passed
\r
493 its expiry time and should be processed immediately. */
\r
494 xProcessTimerNow = pdTRUE;
\r
498 vListInsert( pxCurrentTimerList, &( pxTimer->xTimerListItem ) );
\r
502 return xProcessTimerNow;
\r
504 /*-----------------------------------------------------------*/
\r
506 static void prvProcessReceivedCommands( void )
\r
508 xTIMER_MESSAGE xMessage;
\r
510 portBASE_TYPE xTimerListsWereSwitched, xResult;
\r
511 portTickType xTimeNow;
\r
513 /* In this case the xTimerListsWereSwitched parameter is not used, but it
\r
514 must be present in the function call. */
\r
515 xTimeNow = prvSampleTimeNow( &xTimerListsWereSwitched );
\r
517 while( xQueueReceive( xTimerQueue, &xMessage, tmrNO_DELAY ) != pdFAIL )
\r
519 pxTimer = xMessage.pxTimer;
\r
521 /* Is the timer already in a list of active timers? When the command
\r
522 is trmCOMMAND_PROCESS_TIMER_OVERFLOW, the timer will be NULL as the
\r
523 command is to the task rather than to an individual timer. */
\r
524 if( pxTimer != NULL )
\r
526 if( listIS_CONTAINED_WITHIN( NULL, &( pxTimer->xTimerListItem ) ) == pdFALSE )
\r
528 /* The timer is in a list, remove it. */
\r
529 uxListRemove( &( pxTimer->xTimerListItem ) );
\r
533 traceTIMER_COMMAND_RECEIVED( pxTimer, xMessage.xMessageID, xMessage.xMessageValue );
\r
535 switch( xMessage.xMessageID )
\r
537 case tmrCOMMAND_START :
\r
538 /* Start or restart a timer. */
\r
539 if( prvInsertTimerInActiveList( pxTimer, xMessage.xMessageValue + pxTimer->xTimerPeriodInTicks, xTimeNow, xMessage.xMessageValue ) == pdTRUE )
\r
541 /* The timer expired before it was added to the active timer
\r
542 list. Process it now. */
\r
543 pxTimer->pxCallbackFunction( ( xTimerHandle ) pxTimer );
\r
545 if( pxTimer->uxAutoReload == ( unsigned portBASE_TYPE ) pdTRUE )
\r
547 xResult = xTimerGenericCommand( pxTimer, tmrCOMMAND_START, xMessage.xMessageValue + pxTimer->xTimerPeriodInTicks, NULL, tmrNO_DELAY );
\r
548 configASSERT( xResult );
\r
554 case tmrCOMMAND_STOP :
\r
555 /* The timer has already been removed from the active list.
\r
556 There is nothing to do here. */
\r
559 case tmrCOMMAND_CHANGE_PERIOD :
\r
560 pxTimer->xTimerPeriodInTicks = xMessage.xMessageValue;
\r
561 configASSERT( ( pxTimer->xTimerPeriodInTicks > 0 ) );
\r
562 prvInsertTimerInActiveList( pxTimer, ( xTimeNow + pxTimer->xTimerPeriodInTicks ), xTimeNow, xTimeNow );
\r
565 case tmrCOMMAND_DELETE :
\r
566 /* The timer has already been removed from the active list,
\r
567 just free up the memory. */
\r
568 vPortFree( pxTimer );
\r
572 /* Don't expect to get here. */
\r
577 /*-----------------------------------------------------------*/
\r
579 static void prvSwitchTimerLists( portTickType xLastTime )
\r
581 portTickType xNextExpireTime, xReloadTime;
\r
584 portBASE_TYPE xResult;
\r
586 /* Remove compiler warnings if configASSERT() is not defined. */
\r
587 ( void ) xLastTime;
\r
589 /* The tick count has overflowed. The timer lists must be switched.
\r
590 If there are any timers still referenced from the current timer list
\r
591 then they must have expired and should be processed before the lists
\r
593 while( listLIST_IS_EMPTY( pxCurrentTimerList ) == pdFALSE )
\r
595 xNextExpireTime = listGET_ITEM_VALUE_OF_HEAD_ENTRY( pxCurrentTimerList );
\r
597 /* Remove the timer from the list. */
\r
598 pxTimer = ( xTIMER * ) listGET_OWNER_OF_HEAD_ENTRY( pxCurrentTimerList );
\r
599 uxListRemove( &( pxTimer->xTimerListItem ) );
\r
601 /* Execute its callback, then send a command to restart the timer if
\r
602 it is an auto-reload timer. It cannot be restarted here as the lists
\r
603 have not yet been switched. */
\r
604 pxTimer->pxCallbackFunction( ( xTimerHandle ) pxTimer );
\r
606 if( pxTimer->uxAutoReload == ( unsigned portBASE_TYPE ) pdTRUE )
\r
608 /* Calculate the reload value, and if the reload value results in
\r
609 the timer going into the same timer list then it has already expired
\r
610 and the timer should be re-inserted into the current list so it is
\r
611 processed again within this loop. Otherwise a command should be sent
\r
612 to restart the timer to ensure it is only inserted into a list after
\r
613 the lists have been swapped. */
\r
614 xReloadTime = ( xNextExpireTime + pxTimer->xTimerPeriodInTicks );
\r
615 if( xReloadTime > xNextExpireTime )
\r
617 listSET_LIST_ITEM_VALUE( &( pxTimer->xTimerListItem ), xReloadTime );
\r
618 listSET_LIST_ITEM_OWNER( &( pxTimer->xTimerListItem ), pxTimer );
\r
619 vListInsert( pxCurrentTimerList, &( pxTimer->xTimerListItem ) );
\r
623 xResult = xTimerGenericCommand( pxTimer, tmrCOMMAND_START, xNextExpireTime, NULL, tmrNO_DELAY );
\r
624 configASSERT( xResult );
\r
630 pxTemp = pxCurrentTimerList;
\r
631 pxCurrentTimerList = pxOverflowTimerList;
\r
632 pxOverflowTimerList = pxTemp;
\r
634 /*-----------------------------------------------------------*/
\r
636 static void prvCheckForValidListAndQueue( void )
\r
638 /* Check that the list from which active timers are referenced, and the
\r
639 queue used to communicate with the timer service, have been
\r
641 taskENTER_CRITICAL();
\r
643 if( xTimerQueue == NULL )
\r
645 vListInitialise( &xActiveTimerList1 );
\r
646 vListInitialise( &xActiveTimerList2 );
\r
647 pxCurrentTimerList = &xActiveTimerList1;
\r
648 pxOverflowTimerList = &xActiveTimerList2;
\r
649 xTimerQueue = xQueueCreate( ( unsigned portBASE_TYPE ) configTIMER_QUEUE_LENGTH, sizeof( xTIMER_MESSAGE ) );
\r
652 taskEXIT_CRITICAL();
\r
654 /*-----------------------------------------------------------*/
\r
656 portBASE_TYPE xTimerIsTimerActive( xTimerHandle xTimer )
\r
658 portBASE_TYPE xTimerIsInActiveList;
\r
659 xTIMER *pxTimer = ( xTIMER * ) xTimer;
\r
661 /* Is the timer in the list of active timers? */
\r
662 taskENTER_CRITICAL();
\r
664 /* Checking to see if it is in the NULL list in effect checks to see if
\r
665 it is referenced from either the current or the overflow timer lists in
\r
666 one go, but the logic has to be reversed, hence the '!'. */
\r
667 xTimerIsInActiveList = !( listIS_CONTAINED_WITHIN( NULL, &( pxTimer->xTimerListItem ) ) );
\r
669 taskEXIT_CRITICAL();
\r
671 return xTimerIsInActiveList;
\r
673 /*-----------------------------------------------------------*/
\r
675 void *pvTimerGetTimerID( xTimerHandle xTimer )
\r
677 xTIMER *pxTimer = ( xTIMER * ) xTimer;
\r
679 return pxTimer->pvTimerID;
\r
681 /*-----------------------------------------------------------*/
\r
683 /* This entire source file will be skipped if the application is not configured
\r
684 to include software timer functionality. If you want to include software timer
\r
685 functionality then ensure configUSE_TIMERS is set to 1 in FreeRTOSConfig.h. */
\r
686 #endif /* configUSE_TIMERS == 1 */
\r