2 FreeRTOS V7.4.0 - Copyright (C) 2013 Real Time Engineers Ltd.
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4 FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME. PLEASE VISIT
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5 http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 ***************************************************************************
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9 * FreeRTOS tutorial books are available in pdf and paperback. *
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10 * Complete, revised, and edited pdf reference manuals are also *
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13 * Purchasing FreeRTOS documentation will not only help you, by *
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14 * ensuring you get running as quickly as possible and with an *
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15 * in-depth knowledge of how to use FreeRTOS, it will also help *
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16 * the FreeRTOS project to continue with its mission of providing *
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17 * professional grade, cross platform, de facto standard solutions *
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18 * for microcontrollers - completely free of charge! *
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20 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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22 * Thank you for using FreeRTOS, and thank you for your support! *
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24 ***************************************************************************
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27 This file is part of the FreeRTOS distribution.
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29 FreeRTOS is free software; you can redistribute it and/or modify it under
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30 the terms of the GNU General Public License (version 2) as published by the
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31 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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33 >>>>>>NOTE<<<<<< The modification to the GPL is included to allow you to
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34 distribute a combined work that includes FreeRTOS without being obliged to
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35 provide the source code for proprietary components outside of the FreeRTOS
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38 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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39 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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40 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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41 details. You should have received a copy of the GNU General Public License
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42 and the FreeRTOS license exception along with FreeRTOS; if not itcan be
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43 viewed here: http://www.freertos.org/a00114.html and also obtained by
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44 writing to Real Time Engineers Ltd., contact details for whom are available
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45 on the FreeRTOS WEB site.
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49 ***************************************************************************
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51 * Having a problem? Start by reading the FAQ "My application does *
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52 * not run, what could be wrong?" *
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54 * http://www.FreeRTOS.org/FAQHelp.html *
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56 ***************************************************************************
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59 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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60 license and Real Time Engineers Ltd. contact details.
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62 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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63 including FreeRTOS+Trace - an indispensable productivity tool, and our new
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64 fully thread aware and reentrant UDP/IP stack.
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66 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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67 Integrity Systems, who sell the code with commercial support,
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68 indemnification and middleware, under the OpenRTOS brand.
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70 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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71 engineered and independently SIL3 certified version for use in safety and
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72 mission critical applications that require provable dependability.
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75 /* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
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76 all the API functions to use the MPU wrappers. That should only be done when
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77 task.h is included from an application file. */
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78 #define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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80 #include "FreeRTOS.h"
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85 #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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87 /* This entire source file will be skipped if the application is not configured
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88 to include software timer functionality. This #if is closed at the very bottom
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89 of this file. If you want to include software timer functionality then ensure
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90 configUSE_TIMERS is set to 1 in FreeRTOSConfig.h. */
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91 #if ( configUSE_TIMERS == 1 )
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93 /* Misc definitions. */
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94 #define tmrNO_DELAY ( portTickType ) 0U
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96 /* The definition of the timers themselves. */
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97 typedef struct tmrTimerControl
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99 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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100 xListItem xTimerListItem; /*<< Standard linked list item as used by all kernel features for event management. */
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101 portTickType xTimerPeriodInTicks;/*<< How quickly and often the timer expires. */
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102 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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103 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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104 tmrTIMER_CALLBACK pxCallbackFunction; /*<< The function that will be called when the timer expires. */
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107 /* The definition of messages that can be sent and received on the timer
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109 typedef struct tmrTimerQueueMessage
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111 portBASE_TYPE xMessageID; /*<< The command being sent to the timer service task. */
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112 portTickType xMessageValue; /*<< An optional value used by a subset of commands, for example, when changing the period of a timer. */
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113 xTIMER * pxTimer; /*<< The timer to which the command will be applied. */
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117 /* The list in which active timers are stored. Timers are referenced in expire
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118 time order, with the nearest expiry time at the front of the list. Only the
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119 timer service task is allowed to access xActiveTimerList. */
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120 PRIVILEGED_DATA static xList xActiveTimerList1;
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121 PRIVILEGED_DATA static xList xActiveTimerList2;
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122 PRIVILEGED_DATA static xList *pxCurrentTimerList;
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123 PRIVILEGED_DATA static xList *pxOverflowTimerList;
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125 /* A queue that is used to send commands to the timer service task. */
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126 PRIVILEGED_DATA static xQueueHandle xTimerQueue = NULL;
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128 #if ( INCLUDE_xTimerGetTimerDaemonTaskHandle == 1 )
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130 PRIVILEGED_DATA static xTaskHandle xTimerTaskHandle = NULL;
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134 /*-----------------------------------------------------------*/
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137 * Initialise the infrastructure used by the timer service task if it has not
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138 * been initialised already.
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140 static void prvCheckForValidListAndQueue( void ) PRIVILEGED_FUNCTION;
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143 * The timer service task (daemon). Timer functionality is controlled by this
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144 * task. Other tasks communicate with the timer service task using the
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145 * xTimerQueue queue.
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147 static void prvTimerTask( void *pvParameters ) PRIVILEGED_FUNCTION;
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150 * Called by the timer service task to interpret and process a command it
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151 * received on the timer queue.
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153 static void prvProcessReceivedCommands( void ) PRIVILEGED_FUNCTION;
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156 * Insert the timer into either xActiveTimerList1, or xActiveTimerList2,
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157 * depending on if the expire time causes a timer counter overflow.
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159 static portBASE_TYPE prvInsertTimerInActiveList( xTIMER *pxTimer, portTickType xNextExpiryTime, portTickType xTimeNow, portTickType xCommandTime ) PRIVILEGED_FUNCTION;
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162 * An active timer has reached its expire time. Reload the timer if it is an
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163 * auto reload timer, then call its callback.
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165 static void prvProcessExpiredTimer( portTickType xNextExpireTime, portTickType xTimeNow ) PRIVILEGED_FUNCTION;
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168 * The tick count has overflowed. Switch the timer lists after ensuring the
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169 * current timer list does not still reference some timers.
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171 static void prvSwitchTimerLists( portTickType xLastTime ) PRIVILEGED_FUNCTION;
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174 * Obtain the current tick count, setting *pxTimerListsWereSwitched to pdTRUE
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175 * if a tick count overflow occurred since prvSampleTimeNow() was last called.
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177 static portTickType prvSampleTimeNow( portBASE_TYPE *pxTimerListsWereSwitched ) PRIVILEGED_FUNCTION;
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180 * If the timer list contains any active timers then return the expire time of
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181 * the timer that will expire first and set *pxListWasEmpty to false. If the
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182 * timer list does not contain any timers then return 0 and set *pxListWasEmpty
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185 static portTickType prvGetNextExpireTime( portBASE_TYPE *pxListWasEmpty ) PRIVILEGED_FUNCTION;
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188 * If a timer has expired, process it. Otherwise, block the timer service task
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189 * until either a timer does expire or a command is received.
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191 static void prvProcessTimerOrBlockTask( portTickType xNextExpireTime, portBASE_TYPE xListWasEmpty ) PRIVILEGED_FUNCTION;
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193 /*-----------------------------------------------------------*/
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195 portBASE_TYPE xTimerCreateTimerTask( void )
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197 portBASE_TYPE xReturn = pdFAIL;
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199 /* This function is called when the scheduler is started if
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200 configUSE_TIMERS is set to 1. Check that the infrastructure used by the
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201 timer service task has been created/initialised. If timers have already
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202 been created then the initialisation will already have been performed. */
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203 prvCheckForValidListAndQueue();
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205 if( xTimerQueue != NULL )
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207 #if ( INCLUDE_xTimerGetTimerDaemonTaskHandle == 1 )
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209 /* Create the timer task, storing its handle in xTimerTaskHandle so
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210 it can be returned by the xTimerGetTimerDaemonTaskHandle() function. */
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211 xReturn = xTaskCreate( prvTimerTask, "Tmr Svc", ( unsigned short ) configTIMER_TASK_STACK_DEPTH, NULL, ( ( unsigned portBASE_TYPE ) configTIMER_TASK_PRIORITY ) | portPRIVILEGE_BIT, &xTimerTaskHandle );
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215 /* Create the timer task without storing its handle. */
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216 xReturn = xTaskCreate( prvTimerTask, "Tmr Svc", ( unsigned short ) configTIMER_TASK_STACK_DEPTH, NULL, ( ( unsigned portBASE_TYPE ) configTIMER_TASK_PRIORITY ) | portPRIVILEGE_BIT, NULL);
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221 configASSERT( xReturn );
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224 /*-----------------------------------------------------------*/
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226 xTimerHandle xTimerCreate( const signed char * const pcTimerName, portTickType xTimerPeriodInTicks, unsigned portBASE_TYPE uxAutoReload, void *pvTimerID, tmrTIMER_CALLBACK pxCallbackFunction )
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228 xTIMER *pxNewTimer;
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230 /* Allocate the timer structure. */
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231 if( xTimerPeriodInTicks == ( portTickType ) 0U )
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234 configASSERT( ( xTimerPeriodInTicks > 0 ) );
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238 pxNewTimer = ( xTIMER * ) pvPortMalloc( sizeof( xTIMER ) );
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239 if( pxNewTimer != NULL )
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241 /* Ensure the infrastructure used by the timer service task has been
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242 created/initialised. */
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243 prvCheckForValidListAndQueue();
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245 /* Initialise the timer structure members using the function parameters. */
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246 pxNewTimer->pcTimerName = pcTimerName;
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247 pxNewTimer->xTimerPeriodInTicks = xTimerPeriodInTicks;
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248 pxNewTimer->uxAutoReload = uxAutoReload;
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249 pxNewTimer->pvTimerID = pvTimerID;
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250 pxNewTimer->pxCallbackFunction = pxCallbackFunction;
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251 vListInitialiseItem( &( pxNewTimer->xTimerListItem ) );
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253 traceTIMER_CREATE( pxNewTimer );
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257 traceTIMER_CREATE_FAILED();
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261 return ( xTimerHandle ) pxNewTimer;
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263 /*-----------------------------------------------------------*/
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265 portBASE_TYPE xTimerGenericCommand( xTimerHandle xTimer, portBASE_TYPE xCommandID, portTickType xOptionalValue, signed portBASE_TYPE *pxHigherPriorityTaskWoken, portTickType xBlockTime )
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267 portBASE_TYPE xReturn = pdFAIL;
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268 xTIMER_MESSAGE xMessage;
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270 /* Send a message to the timer service task to perform a particular action
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271 on a particular timer definition. */
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272 if( xTimerQueue != NULL )
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274 /* Send a command to the timer service task to start the xTimer timer. */
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275 xMessage.xMessageID = xCommandID;
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276 xMessage.xMessageValue = xOptionalValue;
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277 xMessage.pxTimer = ( xTIMER * ) xTimer;
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279 if( pxHigherPriorityTaskWoken == NULL )
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281 if( xTaskGetSchedulerState() == taskSCHEDULER_RUNNING )
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283 xReturn = xQueueSendToBack( xTimerQueue, &xMessage, xBlockTime );
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287 xReturn = xQueueSendToBack( xTimerQueue, &xMessage, tmrNO_DELAY );
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292 xReturn = xQueueSendToBackFromISR( xTimerQueue, &xMessage, pxHigherPriorityTaskWoken );
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295 traceTIMER_COMMAND_SEND( xTimer, xCommandID, xOptionalValue, xReturn );
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300 /*-----------------------------------------------------------*/
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302 #if ( INCLUDE_xTimerGetTimerDaemonTaskHandle == 1 )
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304 xTaskHandle xTimerGetTimerDaemonTaskHandle( void )
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306 /* If xTimerGetTimerDaemonTaskHandle() is called before the scheduler has been
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307 started, then xTimerTaskHandle will be NULL. */
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308 configASSERT( ( xTimerTaskHandle != NULL ) );
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309 return xTimerTaskHandle;
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313 /*-----------------------------------------------------------*/
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315 static void prvProcessExpiredTimer( portTickType xNextExpireTime, portTickType xTimeNow )
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318 portBASE_TYPE xResult;
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320 /* Remove the timer from the list of active timers. A check has already
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321 been performed to ensure the list is not empty. */
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322 pxTimer = ( xTIMER * ) listGET_OWNER_OF_HEAD_ENTRY( pxCurrentTimerList );
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323 uxListRemove( &( pxTimer->xTimerListItem ) );
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324 traceTIMER_EXPIRED( pxTimer );
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326 /* If the timer is an auto reload timer then calculate the next
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327 expiry time and re-insert the timer in the list of active timers. */
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328 if( pxTimer->uxAutoReload == ( unsigned portBASE_TYPE ) pdTRUE )
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330 /* This is the only time a timer is inserted into a list using
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331 a time relative to anything other than the current time. It
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332 will therefore be inserted into the correct list relative to
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333 the time this task thinks it is now, even if a command to
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334 switch lists due to a tick count overflow is already waiting in
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335 the timer queue. */
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336 if( prvInsertTimerInActiveList( pxTimer, ( xNextExpireTime + pxTimer->xTimerPeriodInTicks ), xTimeNow, xNextExpireTime ) == pdTRUE )
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338 /* The timer expired before it was added to the active timer
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339 list. Reload it now. */
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340 xResult = xTimerGenericCommand( pxTimer, tmrCOMMAND_START, xNextExpireTime, NULL, tmrNO_DELAY );
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341 configASSERT( xResult );
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346 /* Call the timer callback. */
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347 pxTimer->pxCallbackFunction( ( xTimerHandle ) pxTimer );
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349 /*-----------------------------------------------------------*/
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351 static void prvTimerTask( void *pvParameters )
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353 portTickType xNextExpireTime;
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354 portBASE_TYPE xListWasEmpty;
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356 /* Just to avoid compiler warnings. */
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357 ( void ) pvParameters;
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361 /* Query the timers list to see if it contains any timers, and if so,
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362 obtain the time at which the next timer will expire. */
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363 xNextExpireTime = prvGetNextExpireTime( &xListWasEmpty );
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365 /* If a timer has expired, process it. Otherwise, block this task
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366 until either a timer does expire, or a command is received. */
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367 prvProcessTimerOrBlockTask( xNextExpireTime, xListWasEmpty );
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369 /* Empty the command queue. */
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370 prvProcessReceivedCommands();
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373 /*-----------------------------------------------------------*/
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375 static void prvProcessTimerOrBlockTask( portTickType xNextExpireTime, portBASE_TYPE xListWasEmpty )
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377 portTickType xTimeNow;
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378 portBASE_TYPE xTimerListsWereSwitched;
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382 /* Obtain the time now to make an assessment as to whether the timer
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383 has expired or not. If obtaining the time causes the lists to switch
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384 then don't process this timer as any timers that remained in the list
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385 when the lists were switched will have been processed within the
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386 prvSampelTimeNow() function. */
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387 xTimeNow = prvSampleTimeNow( &xTimerListsWereSwitched );
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388 if( xTimerListsWereSwitched == pdFALSE )
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390 /* The tick count has not overflowed, has the timer expired? */
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391 if( ( xListWasEmpty == pdFALSE ) && ( xNextExpireTime <= xTimeNow ) )
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394 prvProcessExpiredTimer( xNextExpireTime, xTimeNow );
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398 /* The tick count has not overflowed, and the next expire
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399 time has not been reached yet. This task should therefore
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400 block to wait for the next expire time or a command to be
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401 received - whichever comes first. The following line cannot
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402 be reached unless xNextExpireTime > xTimeNow, except in the
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403 case when the current timer list is empty. */
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404 vQueueWaitForMessageRestricted( xTimerQueue, ( xNextExpireTime - xTimeNow ) );
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406 if( xTaskResumeAll() == pdFALSE )
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408 /* Yield to wait for either a command to arrive, or the block time
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409 to expire. If a command arrived between the critical section being
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410 exited and this yield then the yield will not cause the task
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412 portYIELD_WITHIN_API();
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422 /*-----------------------------------------------------------*/
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424 static portTickType prvGetNextExpireTime( portBASE_TYPE *pxListWasEmpty )
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426 portTickType xNextExpireTime;
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428 /* Timers are listed in expiry time order, with the head of the list
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429 referencing the task that will expire first. Obtain the time at which
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430 the timer with the nearest expiry time will expire. If there are no
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431 active timers then just set the next expire time to 0. That will cause
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432 this task to unblock when the tick count overflows, at which point the
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433 timer lists will be switched and the next expiry time can be
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435 *pxListWasEmpty = listLIST_IS_EMPTY( pxCurrentTimerList );
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436 if( *pxListWasEmpty == pdFALSE )
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438 xNextExpireTime = listGET_ITEM_VALUE_OF_HEAD_ENTRY( pxCurrentTimerList );
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442 /* Ensure the task unblocks when the tick count rolls over. */
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443 xNextExpireTime = ( portTickType ) 0U;
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446 return xNextExpireTime;
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448 /*-----------------------------------------------------------*/
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450 static portTickType prvSampleTimeNow( portBASE_TYPE *pxTimerListsWereSwitched )
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452 portTickType xTimeNow;
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453 PRIVILEGED_DATA static portTickType xLastTime = ( portTickType ) 0U;
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455 xTimeNow = xTaskGetTickCount();
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457 if( xTimeNow < xLastTime )
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459 prvSwitchTimerLists( xLastTime );
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460 *pxTimerListsWereSwitched = pdTRUE;
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464 *pxTimerListsWereSwitched = pdFALSE;
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467 xLastTime = xTimeNow;
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471 /*-----------------------------------------------------------*/
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473 static portBASE_TYPE prvInsertTimerInActiveList( xTIMER *pxTimer, portTickType xNextExpiryTime, portTickType xTimeNow, portTickType xCommandTime )
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475 portBASE_TYPE xProcessTimerNow = pdFALSE;
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477 listSET_LIST_ITEM_VALUE( &( pxTimer->xTimerListItem ), xNextExpiryTime );
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478 listSET_LIST_ITEM_OWNER( &( pxTimer->xTimerListItem ), pxTimer );
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480 if( xNextExpiryTime <= xTimeNow )
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482 /* Has the expiry time elapsed between the command to start/reset a
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483 timer was issued, and the time the command was processed? */
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484 if( ( ( portTickType ) ( xTimeNow - xCommandTime ) ) >= pxTimer->xTimerPeriodInTicks )
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486 /* The time between a command being issued and the command being
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487 processed actually exceeds the timers period. */
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488 xProcessTimerNow = pdTRUE;
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492 vListInsert( pxOverflowTimerList, &( pxTimer->xTimerListItem ) );
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497 if( ( xTimeNow < xCommandTime ) && ( xNextExpiryTime >= xCommandTime ) )
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499 /* If, since the command was issued, the tick count has overflowed
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500 but the expiry time has not, then the timer must have already passed
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501 its expiry time and should be processed immediately. */
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502 xProcessTimerNow = pdTRUE;
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506 vListInsert( pxCurrentTimerList, &( pxTimer->xTimerListItem ) );
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510 return xProcessTimerNow;
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512 /*-----------------------------------------------------------*/
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514 static void prvProcessReceivedCommands( void )
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516 xTIMER_MESSAGE xMessage;
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518 portBASE_TYPE xTimerListsWereSwitched, xResult;
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519 portTickType xTimeNow;
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521 while( xQueueReceive( xTimerQueue, &xMessage, tmrNO_DELAY ) != pdFAIL )
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523 pxTimer = xMessage.pxTimer;
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525 if( listIS_CONTAINED_WITHIN( NULL, &( pxTimer->xTimerListItem ) ) == pdFALSE )
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527 /* The timer is in a list, remove it. */
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528 uxListRemove( &( pxTimer->xTimerListItem ) );
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531 traceTIMER_COMMAND_RECEIVED( pxTimer, xMessage.xMessageID, xMessage.xMessageValue );
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533 /* In this case the xTimerListsWereSwitched parameter is not used, but
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534 it must be present in the function call. prvSampleTimeNow() must be
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535 called after the message is received from xTimerQueue so there is no
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536 possibility of a higher priority task adding a message to the message
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537 queue with a time that is ahead of the timer daemon task (because it
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538 pre-empted the timer daemon task after the xTimeNow value was set). */
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539 xTimeNow = prvSampleTimeNow( &xTimerListsWereSwitched );
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541 switch( xMessage.xMessageID )
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543 case tmrCOMMAND_START :
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544 /* Start or restart a timer. */
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545 if( prvInsertTimerInActiveList( pxTimer, xMessage.xMessageValue + pxTimer->xTimerPeriodInTicks, xTimeNow, xMessage.xMessageValue ) == pdTRUE )
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547 /* The timer expired before it was added to the active timer
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548 list. Process it now. */
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549 pxTimer->pxCallbackFunction( ( xTimerHandle ) pxTimer );
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551 if( pxTimer->uxAutoReload == ( unsigned portBASE_TYPE ) pdTRUE )
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553 xResult = xTimerGenericCommand( pxTimer, tmrCOMMAND_START, xMessage.xMessageValue + pxTimer->xTimerPeriodInTicks, NULL, tmrNO_DELAY );
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554 configASSERT( xResult );
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560 case tmrCOMMAND_STOP :
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561 /* The timer has already been removed from the active list.
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562 There is nothing to do here. */
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565 case tmrCOMMAND_CHANGE_PERIOD :
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566 pxTimer->xTimerPeriodInTicks = xMessage.xMessageValue;
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567 configASSERT( ( pxTimer->xTimerPeriodInTicks > 0 ) );
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568 prvInsertTimerInActiveList( pxTimer, ( xTimeNow + pxTimer->xTimerPeriodInTicks ), xTimeNow, xTimeNow );
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571 case tmrCOMMAND_DELETE :
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572 /* The timer has already been removed from the active list,
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573 just free up the memory. */
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574 vPortFree( pxTimer );
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578 /* Don't expect to get here. */
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583 /*-----------------------------------------------------------*/
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585 static void prvSwitchTimerLists( portTickType xLastTime )
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587 portTickType xNextExpireTime, xReloadTime;
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590 portBASE_TYPE xResult;
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592 /* Remove compiler warnings if configASSERT() is not defined. */
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593 ( void ) xLastTime;
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595 /* The tick count has overflowed. The timer lists must be switched.
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596 If there are any timers still referenced from the current timer list
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597 then they must have expired and should be processed before the lists
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599 while( listLIST_IS_EMPTY( pxCurrentTimerList ) == pdFALSE )
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601 xNextExpireTime = listGET_ITEM_VALUE_OF_HEAD_ENTRY( pxCurrentTimerList );
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603 /* Remove the timer from the list. */
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604 pxTimer = ( xTIMER * ) listGET_OWNER_OF_HEAD_ENTRY( pxCurrentTimerList );
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605 uxListRemove( &( pxTimer->xTimerListItem ) );
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607 /* Execute its callback, then send a command to restart the timer if
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608 it is an auto-reload timer. It cannot be restarted here as the lists
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609 have not yet been switched. */
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610 pxTimer->pxCallbackFunction( ( xTimerHandle ) pxTimer );
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612 if( pxTimer->uxAutoReload == ( unsigned portBASE_TYPE ) pdTRUE )
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614 /* Calculate the reload value, and if the reload value results in
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615 the timer going into the same timer list then it has already expired
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616 and the timer should be re-inserted into the current list so it is
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617 processed again within this loop. Otherwise a command should be sent
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618 to restart the timer to ensure it is only inserted into a list after
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619 the lists have been swapped. */
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620 xReloadTime = ( xNextExpireTime + pxTimer->xTimerPeriodInTicks );
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621 if( xReloadTime > xNextExpireTime )
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623 listSET_LIST_ITEM_VALUE( &( pxTimer->xTimerListItem ), xReloadTime );
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624 listSET_LIST_ITEM_OWNER( &( pxTimer->xTimerListItem ), pxTimer );
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625 vListInsert( pxCurrentTimerList, &( pxTimer->xTimerListItem ) );
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629 xResult = xTimerGenericCommand( pxTimer, tmrCOMMAND_START, xNextExpireTime, NULL, tmrNO_DELAY );
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630 configASSERT( xResult );
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636 pxTemp = pxCurrentTimerList;
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637 pxCurrentTimerList = pxOverflowTimerList;
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638 pxOverflowTimerList = pxTemp;
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640 /*-----------------------------------------------------------*/
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642 static void prvCheckForValidListAndQueue( void )
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644 /* Check that the list from which active timers are referenced, and the
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645 queue used to communicate with the timer service, have been
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647 taskENTER_CRITICAL();
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649 if( xTimerQueue == NULL )
\r
651 vListInitialise( &xActiveTimerList1 );
\r
652 vListInitialise( &xActiveTimerList2 );
\r
653 pxCurrentTimerList = &xActiveTimerList1;
\r
654 pxOverflowTimerList = &xActiveTimerList2;
\r
655 xTimerQueue = xQueueCreate( ( unsigned portBASE_TYPE ) configTIMER_QUEUE_LENGTH, sizeof( xTIMER_MESSAGE ) );
\r
658 taskEXIT_CRITICAL();
\r
660 /*-----------------------------------------------------------*/
\r
662 portBASE_TYPE xTimerIsTimerActive( xTimerHandle xTimer )
\r
664 portBASE_TYPE xTimerIsInActiveList;
\r
665 xTIMER *pxTimer = ( xTIMER * ) xTimer;
\r
667 /* Is the timer in the list of active timers? */
\r
668 taskENTER_CRITICAL();
\r
670 /* Checking to see if it is in the NULL list in effect checks to see if
\r
671 it is referenced from either the current or the overflow timer lists in
\r
672 one go, but the logic has to be reversed, hence the '!'. */
\r
673 xTimerIsInActiveList = !( listIS_CONTAINED_WITHIN( NULL, &( pxTimer->xTimerListItem ) ) );
\r
675 taskEXIT_CRITICAL();
\r
677 return xTimerIsInActiveList;
\r
679 /*-----------------------------------------------------------*/
\r
681 void *pvTimerGetTimerID( xTimerHandle xTimer )
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683 xTIMER *pxTimer = ( xTIMER * ) xTimer;
\r
685 return pxTimer->pvTimerID;
\r
687 /*-----------------------------------------------------------*/
\r
689 /* This entire source file will be skipped if the application is not configured
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690 to include software timer functionality. If you want to include software timer
\r
691 functionality then ensure configUSE_TIMERS is set to 1 in FreeRTOSConfig.h. */
\r
692 #endif /* configUSE_TIMERS == 1 */
\r