2 FreeRTOS V7.0.1 - Copyright (C) 2011 Real Time Engineers Ltd.
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5 FreeRTOS supports many tools and architectures. V7.0.0 is sponsored by:
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6 Atollic AB - Atollic provides professional embedded systems development
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7 tools for C/C++ development, code analysis and test automation.
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8 See http://www.atollic.com
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11 ***************************************************************************
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13 * FreeRTOS tutorial books are available in pdf and paperback. *
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14 * Complete, revised, and edited pdf reference manuals are also *
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17 * Purchasing FreeRTOS documentation will not only help you, by *
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18 * ensuring you get running as quickly as possible and with an *
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19 * in-depth knowledge of how to use FreeRTOS, it will also help *
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20 * the FreeRTOS project to continue with its mission of providing *
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21 * professional grade, cross platform, de facto standard solutions *
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22 * for microcontrollers - completely free of charge! *
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24 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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26 * Thank you for using FreeRTOS, and thank you for your support! *
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28 ***************************************************************************
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31 This file is part of the FreeRTOS distribution.
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33 FreeRTOS is free software; you can redistribute it and/or modify it under
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34 the terms of the GNU General Public License (version 2) as published by the
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35 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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36 >>>NOTE<<< The modification to the GPL is included to allow you to
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37 distribute a combined work that includes FreeRTOS without being obliged to
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38 provide the source code for proprietary components outside of the FreeRTOS
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39 kernel. FreeRTOS is distributed in the hope that it will be useful, but
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40 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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41 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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42 more details. You should have received a copy of the GNU General Public
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43 License and the FreeRTOS license exception along with FreeRTOS; if not it
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44 can be viewed here: http://www.freertos.org/a00114.html and also obtained
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45 by writing to Richard Barry, contact details for whom are available on the
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50 http://www.FreeRTOS.org - Documentation, latest information, license and
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53 http://www.SafeRTOS.com - A version that is certified for use in safety
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56 http://www.OpenRTOS.com - Commercial support, development, porting,
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57 licensing and training services.
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60 /* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
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61 all the API functions to use the MPU wrappers. That should only be done when
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62 task.h is included from an application file. */
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63 #define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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65 #include "FreeRTOS.h"
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70 #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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72 /* This entire source file will be skipped if the application is not configured
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73 to include software timer functionality. This #if is closed at the very bottom
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74 of this file. If you want to include software timer functionality then ensure
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75 configUSE_TIMERS is set to 1 in FreeRTOSConfig.h. */
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76 #if ( configUSE_TIMERS == 1 )
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78 /* Misc definitions. */
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79 #define tmrNO_DELAY ( portTickType ) 0U
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81 /* The definition of the timers themselves. */
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82 typedef struct tmrTimerControl
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84 const signed char *pcTimerName; /*<< Text name. This is not used by the kernel, it is included simply to make debugging easier. */
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85 xListItem xTimerListItem; /*<< Standard linked list item as used by all kernel features for event management. */
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86 portTickType xTimerPeriodInTicks;/*<< How quickly and often the timer expires. */
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87 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. */
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88 void *pvTimerID; /*<< An ID to identify the timer. This allows the timer to be identified when the same callback is used for multiple timers. */
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89 tmrTIMER_CALLBACK pxCallbackFunction; /*<< The function that will be called when the timer expires. */
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92 /* The definition of messages that can be sent and received on the timer
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94 typedef struct tmrTimerQueueMessage
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96 portBASE_TYPE xMessageID; /*<< The command being sent to the timer service task. */
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97 portTickType xMessageValue; /*<< An optional value used by a subset of commands, for example, when changing the period of a timer. */
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98 xTIMER * pxTimer; /*<< The timer to which the command will be applied. */
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102 /* The list in which active timers are stored. Timers are referenced in expire
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103 time order, with the nearest expiry time at the front of the list. Only the
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104 timer service task is allowed to access xActiveTimerList. */
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105 PRIVILEGED_DATA static xList xActiveTimerList1;
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106 PRIVILEGED_DATA static xList xActiveTimerList2;
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107 PRIVILEGED_DATA static xList *pxCurrentTimerList;
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108 PRIVILEGED_DATA static xList *pxOverflowTimerList;
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110 /* A queue that is used to send commands to the timer service task. */
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111 PRIVILEGED_DATA static xQueueHandle xTimerQueue = NULL;
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113 #if ( INCLUDE_xTimerDaemonTaskHandleGet == 1 )
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115 PRIVILEGED_DATA static xTaskHandle xTimerTaskHandle = NULL;
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119 /*-----------------------------------------------------------*/
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122 * Initialise the infrastructure used by the timer service task if it has not
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123 * been initialised already.
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125 static void prvCheckForValidListAndQueue( void ) PRIVILEGED_FUNCTION;
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128 * The timer service task (daemon). Timer functionality is controlled by this
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129 * task. Other tasks communicate with the timer service task using the
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130 * xTimerQueue queue.
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132 static void prvTimerTask( void *pvParameters ) PRIVILEGED_FUNCTION;
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135 * Called by the timer service task to interpret and process a command it
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136 * received on the timer queue.
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138 static void prvProcessReceivedCommands( void ) PRIVILEGED_FUNCTION;
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141 * Insert the timer into either xActiveTimerList1, or xActiveTimerList2,
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142 * depending on if the expire time causes a timer counter overflow.
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144 static portBASE_TYPE prvInsertTimerInActiveList( xTIMER *pxTimer, portTickType xNextExpiryTime, portTickType xTimeNow, portTickType xCommandTime ) PRIVILEGED_FUNCTION;
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147 * An active timer has reached its expire time. Reload the timer if it is an
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148 * auto reload timer, then call its callback.
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150 static void prvProcessExpiredTimer( portTickType xNextExpireTime, portTickType xTimeNow ) PRIVILEGED_FUNCTION;
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153 * The tick count has overflowed. Switch the timer lists after ensuring the
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154 * current timer list does not still reference some timers.
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156 static void prvSwitchTimerLists( portTickType xLastTime ) PRIVILEGED_FUNCTION;
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159 * Obtain the current tick count, setting *pxTimerListsWereSwitched to pdTRUE
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160 * if a tick count overflow occurred since prvSampleTimeNow() was last called.
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162 static portTickType prvSampleTimeNow( portBASE_TYPE *pxTimerListsWereSwitched ) PRIVILEGED_FUNCTION;
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165 * If the timer list contains any active timers then return the expire time of
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166 * the timer that will expire first and set *pxListWasEmpty to false. If the
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167 * timer list does not contain any timers then return 0 and set *pxListWasEmpty
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170 static portTickType prvGetNextExpireTime( portBASE_TYPE *pxListWasEmpty ) PRIVILEGED_FUNCTION;
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173 * If a timer has expired, process it. Otherwise, block the timer service task
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174 * until either a timer does expire or a command is received.
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176 static void prvProcessTimerOrBlockTask( portTickType xNextExpireTime, portBASE_TYPE xListWasEmpty ) PRIVILEGED_FUNCTION;
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178 /*-----------------------------------------------------------*/
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180 portBASE_TYPE xTimerCreateTimerTask( void )
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182 portBASE_TYPE xReturn = pdFAIL;
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184 /* This function is called when the scheduler is started if
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185 configUSE_TIMERS is set to 1. Check that the infrastructure used by the
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186 timer service task has been created/initialised. If timers have already
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187 been created then the initialisation will already have been performed. */
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188 prvCheckForValidListAndQueue();
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190 if( xTimerQueue != NULL )
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192 #if ( INCLUDE_xTimerDaemonTaskHandleGet == 1 )
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194 /* Create the timer task, storing its handle in xTimerTaskHandle so
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195 it can be returned by the xTimerDaemonTaskHandleGet() function. */
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196 xReturn = xTaskCreate( prvTimerTask, ( const signed char * ) "Tmr Svc", ( unsigned short ) configTIMER_TASK_STACK_DEPTH, NULL, ( unsigned portBASE_TYPE ) configTIMER_TASK_PRIORITY, &xTimerTaskHandle );
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200 /* Create the timer task without storing its handle. */
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201 xReturn = xTaskCreate( prvTimerTask, ( const signed char * ) "Tmr Svc", ( unsigned short ) configTIMER_TASK_STACK_DEPTH, NULL, ( unsigned portBASE_TYPE ) configTIMER_TASK_PRIORITY, NULL);
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206 configASSERT( xReturn );
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209 /*-----------------------------------------------------------*/
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211 xTimerHandle xTimerCreate( const signed char *pcTimerName, portTickType xTimerPeriodInTicks, unsigned portBASE_TYPE uxAutoReload, void *pvTimerID, tmrTIMER_CALLBACK pxCallbackFunction )
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213 xTIMER *pxNewTimer;
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215 /* Allocate the timer structure. */
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216 if( xTimerPeriodInTicks == ( portTickType ) 0U )
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219 configASSERT( ( xTimerPeriodInTicks > 0 ) );
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223 pxNewTimer = ( xTIMER * ) pvPortMalloc( sizeof( xTIMER ) );
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224 if( pxNewTimer != NULL )
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226 /* Ensure the infrastructure used by the timer service task has been
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227 created/initialised. */
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228 prvCheckForValidListAndQueue();
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230 /* Initialise the timer structure members using the function parameters. */
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231 pxNewTimer->pcTimerName = pcTimerName;
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232 pxNewTimer->xTimerPeriodInTicks = xTimerPeriodInTicks;
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233 pxNewTimer->uxAutoReload = uxAutoReload;
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234 pxNewTimer->pvTimerID = pvTimerID;
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235 pxNewTimer->pxCallbackFunction = pxCallbackFunction;
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236 vListInitialiseItem( &( pxNewTimer->xTimerListItem ) );
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238 traceTIMER_CREATE( pxNewTimer );
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242 traceTIMER_CREATE_FAILED();
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246 return ( xTimerHandle ) pxNewTimer;
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248 /*-----------------------------------------------------------*/
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250 portBASE_TYPE xTimerGenericCommand( xTimerHandle xTimer, portBASE_TYPE xCommandID, portTickType xOptionalValue, portBASE_TYPE *pxHigherPriorityTaskWoken, portTickType xBlockTime )
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252 portBASE_TYPE xReturn = pdFAIL;
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253 xTIMER_MESSAGE xMessage;
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255 /* Send a message to the timer service task to perform a particular action
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256 on a particular timer definition. */
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257 if( xTimerQueue != NULL )
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259 /* Send a command to the timer service task to start the xTimer timer. */
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260 xMessage.xMessageID = xCommandID;
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261 xMessage.xMessageValue = xOptionalValue;
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262 xMessage.pxTimer = ( xTIMER * ) xTimer;
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264 if( pxHigherPriorityTaskWoken == NULL )
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266 if( xTaskGetSchedulerState() == taskSCHEDULER_RUNNING )
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268 xReturn = xQueueSendToBack( xTimerQueue, &xMessage, xBlockTime );
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272 xReturn = xQueueSendToBack( xTimerQueue, &xMessage, tmrNO_DELAY );
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277 xReturn = xQueueSendToBackFromISR( xTimerQueue, &xMessage, pxHigherPriorityTaskWoken );
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280 traceTIMER_COMMAND_SEND( xTimer, xCommandID, xOptionalValue, xReturn );
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285 /*-----------------------------------------------------------*/
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287 #if ( INCLUDE_xTimerDaemonTaskHandleGet == 1 )
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289 xTaskHandle xTimerDaemonTaskHandleGet( void )
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291 /* If xTimerDaemonTaskHandleGet() is called before the scheduler has been
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292 started, then xTimerTaskHandle will be NULL. */
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293 configASSERT( ( xTimerTaskHandle != NULL ) );
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294 return xTimerTaskHandle;
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298 /*-----------------------------------------------------------*/
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300 static void prvProcessExpiredTimer( portTickType xNextExpireTime, portTickType xTimeNow )
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303 portBASE_TYPE xResult;
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305 /* Remove the timer from the list of active timers. A check has already
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306 been performed to ensure the list is not empty. */
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307 pxTimer = ( xTIMER * ) listGET_OWNER_OF_HEAD_ENTRY( pxCurrentTimerList );
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308 vListRemove( &( pxTimer->xTimerListItem ) );
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309 traceTIMER_EXPIRED( pxTimer );
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311 /* If the timer is an auto reload timer then calculate the next
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312 expiry time and re-insert the timer in the list of active timers. */
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313 if( pxTimer->uxAutoReload == ( unsigned portBASE_TYPE ) pdTRUE )
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315 /* This is the only time a timer is inserted into a list using
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316 a time relative to anything other than the current time. It
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317 will therefore be inserted into the correct list relative to
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318 the time this task thinks it is now, even if a command to
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319 switch lists due to a tick count overflow is already waiting in
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320 the timer queue. */
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321 if( prvInsertTimerInActiveList( pxTimer, ( xNextExpireTime + pxTimer->xTimerPeriodInTicks ), xTimeNow, xNextExpireTime ) == pdTRUE )
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323 /* The timer expired before it was added to the active timer
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324 list. Reload it now. */
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325 xResult = xTimerGenericCommand( pxTimer, tmrCOMMAND_START, xNextExpireTime, NULL, tmrNO_DELAY );
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326 configASSERT( xResult );
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331 /* Call the timer callback. */
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332 pxTimer->pxCallbackFunction( ( xTimerHandle ) pxTimer );
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334 /*-----------------------------------------------------------*/
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336 static void prvTimerTask( void *pvParameters )
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338 portTickType xNextExpireTime;
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339 portBASE_TYPE xListWasEmpty;
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341 /* Just to avoid compiler warnings. */
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342 ( void ) pvParameters;
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346 /* Query the timers list to see if it contains any timers, and if so,
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347 obtain the time at which the next timer will expire. */
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348 xNextExpireTime = prvGetNextExpireTime( &xListWasEmpty );
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350 /* If a timer has expired, process it. Otherwise, block this task
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351 until either a timer does expire, or a command is received. */
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352 prvProcessTimerOrBlockTask( xNextExpireTime, xListWasEmpty );
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354 /* Empty the command queue. */
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355 prvProcessReceivedCommands();
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358 /*-----------------------------------------------------------*/
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360 static void prvProcessTimerOrBlockTask( portTickType xNextExpireTime, portBASE_TYPE xListWasEmpty )
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362 portTickType xTimeNow;
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363 portBASE_TYPE xTimerListsWereSwitched;
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367 /* Obtain the time now to make an assessment as to whether the timer
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368 has expired or not. If obtaining the time causes the lists to switch
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369 then don't process this timer as any timers that remained in the list
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370 when the lists were switched will have been processed within the
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371 prvSampelTimeNow() function. */
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372 xTimeNow = prvSampleTimeNow( &xTimerListsWereSwitched );
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373 if( xTimerListsWereSwitched == pdFALSE )
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375 /* The tick count has not overflowed, has the timer expired? */
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376 if( ( xListWasEmpty == pdFALSE ) && ( xNextExpireTime <= xTimeNow ) )
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379 prvProcessExpiredTimer( xNextExpireTime, xTimeNow );
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383 /* The tick count has not overflowed, and the next expire
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384 time has not been reached yet. This task should therefore
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385 block to wait for the next expire time or a command to be
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386 received - whichever comes first. The following line cannot
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387 be reached unless xNextExpireTime > xTimeNow, except in the
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388 case when the current timer list is empty. */
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389 vQueueWaitForMessageRestricted( xTimerQueue, ( xNextExpireTime - xTimeNow ) );
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391 if( xTaskResumeAll() == pdFALSE )
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393 /* Yield to wait for either a command to arrive, or the block time
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394 to expire. If a command arrived between the critical section being
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395 exited and this yield then the yield will not cause the task
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397 portYIELD_WITHIN_API();
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407 /*-----------------------------------------------------------*/
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409 static portTickType prvGetNextExpireTime( portBASE_TYPE *pxListWasEmpty )
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411 portTickType xNextExpireTime;
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413 /* Timers are listed in expiry time order, with the head of the list
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414 referencing the task that will expire first. Obtain the time at which
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415 the timer with the nearest expiry time will expire. If there are no
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416 active timers then just set the next expire time to 0. That will cause
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417 this task to unblock when the tick count overflows, at which point the
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418 timer lists will be switched and the next expiry time can be
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420 *pxListWasEmpty = listLIST_IS_EMPTY( pxCurrentTimerList );
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421 if( *pxListWasEmpty == pdFALSE )
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423 xNextExpireTime = listGET_ITEM_VALUE_OF_HEAD_ENTRY( pxCurrentTimerList );
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427 /* Ensure the task unblocks when the tick count rolls over. */
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428 xNextExpireTime = ( portTickType ) 0U;
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431 return xNextExpireTime;
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433 /*-----------------------------------------------------------*/
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435 static portTickType prvSampleTimeNow( portBASE_TYPE *pxTimerListsWereSwitched )
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437 portTickType xTimeNow;
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438 static portTickType xLastTime = ( portTickType ) 0U;
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440 xTimeNow = xTaskGetTickCount();
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442 if( xTimeNow < xLastTime )
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444 prvSwitchTimerLists( xLastTime );
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445 *pxTimerListsWereSwitched = pdTRUE;
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449 *pxTimerListsWereSwitched = pdFALSE;
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452 xLastTime = xTimeNow;
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456 /*-----------------------------------------------------------*/
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458 static portBASE_TYPE prvInsertTimerInActiveList( xTIMER *pxTimer, portTickType xNextExpiryTime, portTickType xTimeNow, portTickType xCommandTime )
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460 portBASE_TYPE xProcessTimerNow = pdFALSE;
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462 listSET_LIST_ITEM_VALUE( &( pxTimer->xTimerListItem ), xNextExpiryTime );
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463 listSET_LIST_ITEM_OWNER( &( pxTimer->xTimerListItem ), pxTimer );
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465 if( xNextExpiryTime <= xTimeNow )
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467 /* Has the expiry time elapsed between the command to start/reset a
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468 timer was issued, and the time the command was processed? */
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469 if( ( ( portTickType ) ( xTimeNow - xCommandTime ) ) >= pxTimer->xTimerPeriodInTicks )
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471 /* The time between a command being issued and the command being
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472 processed actually exceeds the timers period. */
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473 xProcessTimerNow = pdTRUE;
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477 vListInsert( pxOverflowTimerList, &( pxTimer->xTimerListItem ) );
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482 if( ( xTimeNow < xCommandTime ) && ( xNextExpiryTime >= xCommandTime ) )
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484 /* If, since the command was issued, the tick count has overflowed
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485 but the expiry time has not, then the timer must have already passed
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486 its expiry time and should be processed immediately. */
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487 xProcessTimerNow = pdTRUE;
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491 vListInsert( pxCurrentTimerList, &( pxTimer->xTimerListItem ) );
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495 return xProcessTimerNow;
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497 /*-----------------------------------------------------------*/
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499 static void prvProcessReceivedCommands( void )
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501 xTIMER_MESSAGE xMessage;
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503 portBASE_TYPE xTimerListsWereSwitched, xResult;
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504 portTickType xTimeNow;
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506 /* In this case the xTimerListsWereSwitched parameter is not used, but it
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507 must be present in the function call. */
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508 xTimeNow = prvSampleTimeNow( &xTimerListsWereSwitched );
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510 while( xQueueReceive( xTimerQueue, &xMessage, tmrNO_DELAY ) != pdFAIL )
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512 pxTimer = xMessage.pxTimer;
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514 /* Is the timer already in a list of active timers? When the command
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515 is trmCOMMAND_PROCESS_TIMER_OVERFLOW, the timer will be NULL as the
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516 command is to the task rather than to an individual timer. */
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517 if( pxTimer != NULL )
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519 if( listIS_CONTAINED_WITHIN( NULL, &( pxTimer->xTimerListItem ) ) == pdFALSE )
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521 /* The timer is in a list, remove it. */
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522 vListRemove( &( pxTimer->xTimerListItem ) );
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526 traceTIMER_COMMAND_RECEIVED( pxTimer, xMessage.xMessageID, xMessage.xMessageValue );
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528 switch( xMessage.xMessageID )
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530 case tmrCOMMAND_START :
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531 /* Start or restart a timer. */
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532 if( prvInsertTimerInActiveList( pxTimer, xMessage.xMessageValue + pxTimer->xTimerPeriodInTicks, xTimeNow, xMessage.xMessageValue ) == pdTRUE )
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534 /* The timer expired before it was added to the active timer
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535 list. Process it now. */
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536 pxTimer->pxCallbackFunction( ( xTimerHandle ) pxTimer );
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538 if( pxTimer->uxAutoReload == ( unsigned portBASE_TYPE ) pdTRUE )
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540 xResult = xTimerGenericCommand( pxTimer, tmrCOMMAND_START, xMessage.xMessageValue + pxTimer->xTimerPeriodInTicks, NULL, tmrNO_DELAY );
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541 configASSERT( xResult );
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547 case tmrCOMMAND_STOP :
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548 /* The timer has already been removed from the active list.
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549 There is nothing to do here. */
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552 case tmrCOMMAND_CHANGE_PERIOD :
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553 pxTimer->xTimerPeriodInTicks = xMessage.xMessageValue;
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554 configASSERT( ( pxTimer->xTimerPeriodInTicks > 0 ) );
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555 prvInsertTimerInActiveList( pxTimer, ( xTimeNow + pxTimer->xTimerPeriodInTicks ), xTimeNow, xTimeNow );
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558 case tmrCOMMAND_DELETE :
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559 /* The timer has already been removed from the active list,
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560 just free up the memory. */
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561 vPortFree( pxTimer );
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565 /* Don't expect to get here. */
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570 /*-----------------------------------------------------------*/
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572 static void prvSwitchTimerLists( portTickType xLastTime )
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574 portTickType xNextExpireTime, xReloadTime;
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577 portBASE_TYPE xResult;
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579 /* Remove compiler warnings if configASSERT() is not defined. */
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580 ( void ) xLastTime;
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582 /* The tick count has overflowed. The timer lists must be switched.
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583 If there are any timers still referenced from the current timer list
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584 then they must have expired and should be processed before the lists
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586 while( listLIST_IS_EMPTY( pxCurrentTimerList ) == pdFALSE )
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588 xNextExpireTime = listGET_ITEM_VALUE_OF_HEAD_ENTRY( pxCurrentTimerList );
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590 /* Remove the timer from the list. */
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591 pxTimer = ( xTIMER * ) listGET_OWNER_OF_HEAD_ENTRY( pxCurrentTimerList );
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592 vListRemove( &( pxTimer->xTimerListItem ) );
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594 /* Execute its callback, then send a command to restart the timer if
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595 it is an auto-reload timer. It cannot be restarted here as the lists
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596 have not yet been switched. */
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597 pxTimer->pxCallbackFunction( ( xTimerHandle ) pxTimer );
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599 if( pxTimer->uxAutoReload == ( unsigned portBASE_TYPE ) pdTRUE )
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601 /* Calculate the reload value, and if the reload value results in
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602 the timer going into the same timer list then it has already expired
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603 and the timer should be re-inserted into the current list so it is
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604 processed again within this loop. Otherwise a command should be sent
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605 to restart the timer to ensure it is only inserted into a list after
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606 the lists have been swapped. */
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607 xReloadTime = ( xNextExpireTime + pxTimer->xTimerPeriodInTicks );
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608 if( xReloadTime > xNextExpireTime )
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610 listSET_LIST_ITEM_VALUE( &( pxTimer->xTimerListItem ), xReloadTime );
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611 listSET_LIST_ITEM_OWNER( &( pxTimer->xTimerListItem ), pxTimer );
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612 vListInsert( pxCurrentTimerList, &( pxTimer->xTimerListItem ) );
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616 xResult = xTimerGenericCommand( pxTimer, tmrCOMMAND_START, xNextExpireTime, NULL, tmrNO_DELAY );
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617 configASSERT( xResult );
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623 pxTemp = pxCurrentTimerList;
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624 pxCurrentTimerList = pxOverflowTimerList;
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625 pxOverflowTimerList = pxTemp;
\r
627 /*-----------------------------------------------------------*/
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629 static void prvCheckForValidListAndQueue( void )
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631 /* Check that the list from which active timers are referenced, and the
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632 queue used to communicate with the timer service, have been
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634 taskENTER_CRITICAL();
\r
636 if( xTimerQueue == NULL )
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638 vListInitialise( &xActiveTimerList1 );
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639 vListInitialise( &xActiveTimerList2 );
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640 pxCurrentTimerList = &xActiveTimerList1;
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641 pxOverflowTimerList = &xActiveTimerList2;
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642 xTimerQueue = xQueueCreate( ( unsigned portBASE_TYPE ) configTIMER_QUEUE_LENGTH, sizeof( xTIMER_MESSAGE ) );
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645 taskEXIT_CRITICAL();
\r
647 /*-----------------------------------------------------------*/
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649 portBASE_TYPE xTimerIsTimerActive( xTimerHandle xTimer )
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651 portBASE_TYPE xTimerIsInActiveList;
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652 xTIMER *pxTimer = ( xTIMER * ) xTimer;
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654 /* Is the timer in the list of active timers? */
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655 taskENTER_CRITICAL();
\r
657 /* Checking to see if it is in the NULL list in effect checks to see if
\r
658 it is referenced from either the current or the overflow timer lists in
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659 one go, but the logic has to be reversed, hence the '!'. */
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660 xTimerIsInActiveList = !( listIS_CONTAINED_WITHIN( NULL, &( pxTimer->xTimerListItem ) ) );
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662 taskEXIT_CRITICAL();
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664 return xTimerIsInActiveList;
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666 /*-----------------------------------------------------------*/
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668 void *pvTimerGetTimerID( xTimerHandle xTimer )
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670 xTIMER *pxTimer = ( xTIMER * ) xTimer;
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672 return pxTimer->pvTimerID;
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674 /*-----------------------------------------------------------*/
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676 /* This entire source file will be skipped if the application is not configured
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677 to include software timer functionality. If you want to include software timer
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678 functionality then ensure configUSE_TIMERS is set to 1 in FreeRTOSConfig.h. */
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679 #endif /* configUSE_TIMERS == 1 */
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