2 FreeRTOS V7.5.3 - Copyright (C) 2013 Real Time Engineers Ltd.
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5 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 ***************************************************************************
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9 * FreeRTOS provides completely free yet professionally developed, *
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10 * robust, strictly quality controlled, supported, and cross *
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11 * platform software that has become a de facto standard. *
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13 * Help yourself get started quickly and support the FreeRTOS *
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14 * project by purchasing a FreeRTOS tutorial book, reference *
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15 * manual, or both from: http://www.FreeRTOS.org/Documentation *
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19 ***************************************************************************
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21 This file is part of the FreeRTOS distribution.
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23 FreeRTOS is free software; you can redistribute it and/or modify it under
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24 the terms of the GNU General Public License (version 2) as published by the
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25 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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27 >>! NOTE: The modification to the GPL is included to allow you to distribute
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28 >>! a combined work that includes FreeRTOS without being obliged to provide
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29 >>! the source code for proprietary components outside of the FreeRTOS
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32 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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33 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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34 FOR A PARTICULAR PURPOSE. Full license text is available from the following
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35 link: http://www.freertos.org/a00114.html
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39 ***************************************************************************
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41 * Having a problem? Start by reading the FAQ "My application does *
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42 * not run, what could be wrong?" *
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44 * http://www.FreeRTOS.org/FAQHelp.html *
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46 ***************************************************************************
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48 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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49 license and Real Time Engineers Ltd. contact details.
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51 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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52 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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53 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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55 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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56 Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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57 licenses offer ticketed support, indemnification and middleware.
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59 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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60 engineered and independently SIL3 certified version for use in safety and
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61 mission critical applications that require provable dependability.
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66 /* Standard includes. */
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69 /* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
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70 all the API functions to use the MPU wrappers. That should only be done when
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71 task.h is included from an application file. */
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72 #define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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74 #include "FreeRTOS.h"
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79 /* Lint e961 and e750 are suppressed as a MISRA exception justified because the
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80 MPU ports require MPU_WRAPPERS_INCLUDED_FROM_API_FILE to be defined for the
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81 header files above, but not in this file, in order to generate the correct
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82 privileged Vs unprivileged linkage and placement. */
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83 #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE /*lint !e961 !e750. */
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86 /* This entire source file will be skipped if the application is not configured
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87 to include software timer functionality. This #if is closed at the very bottom
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88 of this file. If you want to include software timer functionality then ensure
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89 configUSE_TIMERS is set to 1 in FreeRTOSConfig.h. */
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90 #if ( configUSE_TIMERS == 1 )
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92 /* Misc definitions. */
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93 #define tmrNO_DELAY ( portTickType ) 0U
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95 /* The definition of the timers themselves. */
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96 typedef struct tmrTimerControl
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98 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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99 xListItem xTimerListItem; /*<< Standard linked list item as used by all kernel features for event management. */
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100 portTickType xTimerPeriodInTicks;/*<< How quickly and often the timer expires. */
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101 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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102 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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103 tmrTIMER_CALLBACK pxCallbackFunction; /*<< The function that will be called when the timer expires. */
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106 /* The definition of messages that can be sent and received on the timer
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108 typedef struct tmrTimerQueueMessage
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110 portBASE_TYPE xMessageID; /*<< The command being sent to the timer service task. */
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111 portTickType xMessageValue; /*<< An optional value used by a subset of commands, for example, when changing the period of a timer. */
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112 xTIMER * pxTimer; /*<< The timer to which the command will be applied. */
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115 /*lint -e956 A manual analysis and inspection has been used to determine which
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116 static variables must be declared volatile. */
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118 /* The list in which active timers are stored. Timers are referenced in expire
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119 time order, with the nearest expiry time at the front of the list. Only the
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120 timer service task is allowed to access xActiveTimerList. */
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121 PRIVILEGED_DATA static xList xActiveTimerList1;
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122 PRIVILEGED_DATA static xList xActiveTimerList2;
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123 PRIVILEGED_DATA static xList *pxCurrentTimerList;
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124 PRIVILEGED_DATA static xList *pxOverflowTimerList;
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126 /* A queue that is used to send commands to the timer service task. */
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127 PRIVILEGED_DATA static xQueueHandle xTimerQueue = NULL;
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129 #if ( INCLUDE_xTimerGetTimerDaemonTaskHandle == 1 )
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131 PRIVILEGED_DATA static xTaskHandle xTimerTaskHandle = NULL;
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137 /*-----------------------------------------------------------*/
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140 * Initialise the infrastructure used by the timer service task if it has not
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141 * been initialised already.
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143 static void prvCheckForValidListAndQueue( void ) PRIVILEGED_FUNCTION;
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146 * The timer service task (daemon). Timer functionality is controlled by this
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147 * task. Other tasks communicate with the timer service task using the
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148 * xTimerQueue queue.
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150 static void prvTimerTask( void *pvParameters ) PRIVILEGED_FUNCTION;
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153 * Called by the timer service task to interpret and process a command it
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154 * received on the timer queue.
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156 static void prvProcessReceivedCommands( void ) PRIVILEGED_FUNCTION;
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159 * Insert the timer into either xActiveTimerList1, or xActiveTimerList2,
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160 * depending on if the expire time causes a timer counter overflow.
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162 static portBASE_TYPE prvInsertTimerInActiveList( xTIMER *pxTimer, portTickType xNextExpiryTime, portTickType xTimeNow, portTickType xCommandTime ) PRIVILEGED_FUNCTION;
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165 * An active timer has reached its expire time. Reload the timer if it is an
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166 * auto reload timer, then call its callback.
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168 static void prvProcessExpiredTimer( portTickType xNextExpireTime, portTickType xTimeNow ) PRIVILEGED_FUNCTION;
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171 * The tick count has overflowed. Switch the timer lists after ensuring the
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172 * current timer list does not still reference some timers.
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174 static void prvSwitchTimerLists( portTickType xLastTime ) PRIVILEGED_FUNCTION;
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177 * Obtain the current tick count, setting *pxTimerListsWereSwitched to pdTRUE
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178 * if a tick count overflow occurred since prvSampleTimeNow() was last called.
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180 static portTickType prvSampleTimeNow( portBASE_TYPE *pxTimerListsWereSwitched ) PRIVILEGED_FUNCTION;
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183 * If the timer list contains any active timers then return the expire time of
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184 * the timer that will expire first and set *pxListWasEmpty to false. If the
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185 * timer list does not contain any timers then return 0 and set *pxListWasEmpty
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188 static portTickType prvGetNextExpireTime( portBASE_TYPE *pxListWasEmpty ) PRIVILEGED_FUNCTION;
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191 * If a timer has expired, process it. Otherwise, block the timer service task
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192 * until either a timer does expire or a command is received.
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194 static void prvProcessTimerOrBlockTask( portTickType xNextExpireTime, portBASE_TYPE xListWasEmpty ) PRIVILEGED_FUNCTION;
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196 /*-----------------------------------------------------------*/
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198 portBASE_TYPE xTimerCreateTimerTask( void )
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200 portBASE_TYPE xReturn = pdFAIL;
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202 /* This function is called when the scheduler is started if
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203 configUSE_TIMERS is set to 1. Check that the infrastructure used by the
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204 timer service task has been created/initialised. If timers have already
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205 been created then the initialisation will already have been performed. */
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206 prvCheckForValidListAndQueue();
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208 if( xTimerQueue != NULL )
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210 #if ( INCLUDE_xTimerGetTimerDaemonTaskHandle == 1 )
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212 /* Create the timer task, storing its handle in xTimerTaskHandle so
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213 it can be returned by the xTimerGetTimerDaemonTaskHandle() function. */
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214 xReturn = xTaskCreate( prvTimerTask, ( const signed char * ) "Tmr Svc", ( unsigned short ) configTIMER_TASK_STACK_DEPTH, NULL, ( ( unsigned portBASE_TYPE ) configTIMER_TASK_PRIORITY ) | portPRIVILEGE_BIT, &xTimerTaskHandle );
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218 /* Create the timer task without storing its handle. */
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219 xReturn = xTaskCreate( prvTimerTask, ( const signed char * ) "Tmr Svc", ( unsigned short ) configTIMER_TASK_STACK_DEPTH, NULL, ( ( unsigned portBASE_TYPE ) configTIMER_TASK_PRIORITY ) | portPRIVILEGE_BIT, NULL);
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224 configASSERT( xReturn );
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227 /*-----------------------------------------------------------*/
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229 xTimerHandle xTimerCreate( const signed char * const pcTimerName, portTickType xTimerPeriodInTicks, unsigned portBASE_TYPE uxAutoReload, void *pvTimerID, tmrTIMER_CALLBACK pxCallbackFunction )
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231 xTIMER *pxNewTimer;
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233 /* Allocate the timer structure. */
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234 if( xTimerPeriodInTicks == ( portTickType ) 0U )
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240 pxNewTimer = ( xTIMER * ) pvPortMalloc( sizeof( xTIMER ) );
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241 if( pxNewTimer != NULL )
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243 /* Ensure the infrastructure used by the timer service task has been
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244 created/initialised. */
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245 prvCheckForValidListAndQueue();
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247 /* Initialise the timer structure members using the function parameters. */
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248 pxNewTimer->pcTimerName = pcTimerName;
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249 pxNewTimer->xTimerPeriodInTicks = xTimerPeriodInTicks;
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250 pxNewTimer->uxAutoReload = uxAutoReload;
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251 pxNewTimer->pvTimerID = pvTimerID;
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252 pxNewTimer->pxCallbackFunction = pxCallbackFunction;
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253 vListInitialiseItem( &( pxNewTimer->xTimerListItem ) );
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255 traceTIMER_CREATE( pxNewTimer );
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259 traceTIMER_CREATE_FAILED();
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263 /* 0 is not a valid value for xTimerPeriodInTicks. */
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264 configASSERT( ( xTimerPeriodInTicks > 0 ) );
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266 return ( xTimerHandle ) pxNewTimer;
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268 /*-----------------------------------------------------------*/
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270 portBASE_TYPE xTimerGenericCommand( xTimerHandle xTimer, portBASE_TYPE xCommandID, portTickType xOptionalValue, signed portBASE_TYPE *pxHigherPriorityTaskWoken, portTickType xBlockTime )
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272 portBASE_TYPE xReturn = pdFAIL;
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273 xTIMER_MESSAGE xMessage;
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275 /* Send a message to the timer service task to perform a particular action
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276 on a particular timer definition. */
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277 if( xTimerQueue != NULL )
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279 /* Send a command to the timer service task to start the xTimer timer. */
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280 xMessage.xMessageID = xCommandID;
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281 xMessage.xMessageValue = xOptionalValue;
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282 xMessage.pxTimer = ( xTIMER * ) xTimer;
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284 if( pxHigherPriorityTaskWoken == NULL )
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286 if( xTaskGetSchedulerState() == taskSCHEDULER_RUNNING )
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288 xReturn = xQueueSendToBack( xTimerQueue, &xMessage, xBlockTime );
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292 xReturn = xQueueSendToBack( xTimerQueue, &xMessage, tmrNO_DELAY );
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297 xReturn = xQueueSendToBackFromISR( xTimerQueue, &xMessage, pxHigherPriorityTaskWoken );
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300 traceTIMER_COMMAND_SEND( xTimer, xCommandID, xOptionalValue, xReturn );
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305 /*-----------------------------------------------------------*/
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307 #if ( INCLUDE_xTimerGetTimerDaemonTaskHandle == 1 )
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309 xTaskHandle xTimerGetTimerDaemonTaskHandle( void )
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311 /* If xTimerGetTimerDaemonTaskHandle() is called before the scheduler has been
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312 started, then xTimerTaskHandle will be NULL. */
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313 configASSERT( ( xTimerTaskHandle != NULL ) );
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314 return xTimerTaskHandle;
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318 /*-----------------------------------------------------------*/
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320 static void prvProcessExpiredTimer( portTickType xNextExpireTime, portTickType xTimeNow )
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323 portBASE_TYPE xResult;
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325 /* Remove the timer from the list of active timers. A check has already
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326 been performed to ensure the list is not empty. */
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327 pxTimer = ( xTIMER * ) listGET_OWNER_OF_HEAD_ENTRY( pxCurrentTimerList );
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328 ( void ) uxListRemove( &( pxTimer->xTimerListItem ) );
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329 traceTIMER_EXPIRED( pxTimer );
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331 /* If the timer is an auto reload timer then calculate the next
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332 expiry time and re-insert the timer in the list of active timers. */
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333 if( pxTimer->uxAutoReload == ( unsigned portBASE_TYPE ) pdTRUE )
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335 /* This is the only time a timer is inserted into a list using
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336 a time relative to anything other than the current time. It
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337 will therefore be inserted into the correct list relative to
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338 the time this task thinks it is now, even if a command to
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339 switch lists due to a tick count overflow is already waiting in
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340 the timer queue. */
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341 if( prvInsertTimerInActiveList( pxTimer, ( xNextExpireTime + pxTimer->xTimerPeriodInTicks ), xTimeNow, xNextExpireTime ) == pdTRUE )
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343 /* The timer expired before it was added to the active timer
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344 list. Reload it now. */
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345 xResult = xTimerGenericCommand( pxTimer, tmrCOMMAND_START, xNextExpireTime, NULL, tmrNO_DELAY );
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346 configASSERT( xResult );
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351 /* Call the timer callback. */
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352 pxTimer->pxCallbackFunction( ( xTimerHandle ) pxTimer );
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354 /*-----------------------------------------------------------*/
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356 static void prvTimerTask( void *pvParameters )
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358 portTickType xNextExpireTime;
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359 portBASE_TYPE xListWasEmpty;
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361 /* Just to avoid compiler warnings. */
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362 ( void ) pvParameters;
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366 /* Query the timers list to see if it contains any timers, and if so,
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367 obtain the time at which the next timer will expire. */
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368 xNextExpireTime = prvGetNextExpireTime( &xListWasEmpty );
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370 /* If a timer has expired, process it. Otherwise, block this task
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371 until either a timer does expire, or a command is received. */
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372 prvProcessTimerOrBlockTask( xNextExpireTime, xListWasEmpty );
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374 /* Empty the command queue. */
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375 prvProcessReceivedCommands();
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378 /*-----------------------------------------------------------*/
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380 static void prvProcessTimerOrBlockTask( portTickType xNextExpireTime, portBASE_TYPE xListWasEmpty )
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382 portTickType xTimeNow;
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383 portBASE_TYPE xTimerListsWereSwitched;
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387 /* Obtain the time now to make an assessment as to whether the timer
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388 has expired or not. If obtaining the time causes the lists to switch
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389 then don't process this timer as any timers that remained in the list
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390 when the lists were switched will have been processed within the
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391 prvSampelTimeNow() function. */
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392 xTimeNow = prvSampleTimeNow( &xTimerListsWereSwitched );
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393 if( xTimerListsWereSwitched == pdFALSE )
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395 /* The tick count has not overflowed, has the timer expired? */
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396 if( ( xListWasEmpty == pdFALSE ) && ( xNextExpireTime <= xTimeNow ) )
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398 ( void ) xTaskResumeAll();
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399 prvProcessExpiredTimer( xNextExpireTime, xTimeNow );
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403 /* The tick count has not overflowed, and the next expire
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404 time has not been reached yet. This task should therefore
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405 block to wait for the next expire time or a command to be
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406 received - whichever comes first. The following line cannot
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407 be reached unless xNextExpireTime > xTimeNow, except in the
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408 case when the current timer list is empty. */
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409 vQueueWaitForMessageRestricted( xTimerQueue, ( xNextExpireTime - xTimeNow ) );
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411 if( xTaskResumeAll() == pdFALSE )
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413 /* Yield to wait for either a command to arrive, or the block time
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414 to expire. If a command arrived between the critical section being
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415 exited and this yield then the yield will not cause the task
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417 portYIELD_WITHIN_API();
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423 ( void ) xTaskResumeAll();
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427 /*-----------------------------------------------------------*/
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429 static portTickType prvGetNextExpireTime( portBASE_TYPE *pxListWasEmpty )
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431 portTickType xNextExpireTime;
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433 /* Timers are listed in expiry time order, with the head of the list
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434 referencing the task that will expire first. Obtain the time at which
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435 the timer with the nearest expiry time will expire. If there are no
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436 active timers then just set the next expire time to 0. That will cause
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437 this task to unblock when the tick count overflows, at which point the
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438 timer lists will be switched and the next expiry time can be
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440 *pxListWasEmpty = listLIST_IS_EMPTY( pxCurrentTimerList );
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441 if( *pxListWasEmpty == pdFALSE )
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443 xNextExpireTime = listGET_ITEM_VALUE_OF_HEAD_ENTRY( pxCurrentTimerList );
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447 /* Ensure the task unblocks when the tick count rolls over. */
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448 xNextExpireTime = ( portTickType ) 0U;
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451 return xNextExpireTime;
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453 /*-----------------------------------------------------------*/
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455 static portTickType prvSampleTimeNow( portBASE_TYPE *pxTimerListsWereSwitched )
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457 portTickType xTimeNow;
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458 PRIVILEGED_DATA static portTickType xLastTime = ( portTickType ) 0U; /*lint !e956 Variable is only accessible to one task. */
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460 xTimeNow = xTaskGetTickCount();
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462 if( xTimeNow < xLastTime )
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464 prvSwitchTimerLists( xLastTime );
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465 *pxTimerListsWereSwitched = pdTRUE;
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469 *pxTimerListsWereSwitched = pdFALSE;
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472 xLastTime = xTimeNow;
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476 /*-----------------------------------------------------------*/
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478 static portBASE_TYPE prvInsertTimerInActiveList( xTIMER *pxTimer, portTickType xNextExpiryTime, portTickType xTimeNow, portTickType xCommandTime )
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480 portBASE_TYPE xProcessTimerNow = pdFALSE;
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482 listSET_LIST_ITEM_VALUE( &( pxTimer->xTimerListItem ), xNextExpiryTime );
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483 listSET_LIST_ITEM_OWNER( &( pxTimer->xTimerListItem ), pxTimer );
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485 if( xNextExpiryTime <= xTimeNow )
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487 /* Has the expiry time elapsed between the command to start/reset a
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488 timer was issued, and the time the command was processed? */
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489 if( ( xTimeNow - xCommandTime ) >= pxTimer->xTimerPeriodInTicks )
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491 /* The time between a command being issued and the command being
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492 processed actually exceeds the timers period. */
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493 xProcessTimerNow = pdTRUE;
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497 vListInsert( pxOverflowTimerList, &( pxTimer->xTimerListItem ) );
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502 if( ( xTimeNow < xCommandTime ) && ( xNextExpiryTime >= xCommandTime ) )
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504 /* If, since the command was issued, the tick count has overflowed
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505 but the expiry time has not, then the timer must have already passed
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506 its expiry time and should be processed immediately. */
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507 xProcessTimerNow = pdTRUE;
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511 vListInsert( pxCurrentTimerList, &( pxTimer->xTimerListItem ) );
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515 return xProcessTimerNow;
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517 /*-----------------------------------------------------------*/
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519 static void prvProcessReceivedCommands( void )
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521 xTIMER_MESSAGE xMessage;
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523 portBASE_TYPE xTimerListsWereSwitched, xResult;
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524 portTickType xTimeNow;
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526 while( xQueueReceive( xTimerQueue, &xMessage, tmrNO_DELAY ) != pdFAIL ) /*lint !e603 xMessage does not have to be initialised as it is passed out, not in, and it is not used unless xQueueReceive() returns pdTRUE. */
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528 pxTimer = xMessage.pxTimer;
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530 if( listIS_CONTAINED_WITHIN( NULL, &( pxTimer->xTimerListItem ) ) == pdFALSE )
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532 /* The timer is in a list, remove it. */
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533 ( void ) uxListRemove( &( pxTimer->xTimerListItem ) );
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536 traceTIMER_COMMAND_RECEIVED( pxTimer, xMessage.xMessageID, xMessage.xMessageValue );
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538 /* In this case the xTimerListsWereSwitched parameter is not used, but
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539 it must be present in the function call. prvSampleTimeNow() must be
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540 called after the message is received from xTimerQueue so there is no
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541 possibility of a higher priority task adding a message to the message
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542 queue with a time that is ahead of the timer daemon task (because it
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543 pre-empted the timer daemon task after the xTimeNow value was set). */
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544 xTimeNow = prvSampleTimeNow( &xTimerListsWereSwitched );
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546 switch( xMessage.xMessageID )
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548 case tmrCOMMAND_START :
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549 /* Start or restart a timer. */
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550 if( prvInsertTimerInActiveList( pxTimer, xMessage.xMessageValue + pxTimer->xTimerPeriodInTicks, xTimeNow, xMessage.xMessageValue ) == pdTRUE )
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552 /* The timer expired before it was added to the active timer
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553 list. Process it now. */
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554 pxTimer->pxCallbackFunction( ( xTimerHandle ) pxTimer );
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556 if( pxTimer->uxAutoReload == ( unsigned portBASE_TYPE ) pdTRUE )
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558 xResult = xTimerGenericCommand( pxTimer, tmrCOMMAND_START, xMessage.xMessageValue + pxTimer->xTimerPeriodInTicks, NULL, tmrNO_DELAY );
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559 configASSERT( xResult );
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565 case tmrCOMMAND_STOP :
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566 /* The timer has already been removed from the active list.
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567 There is nothing to do here. */
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570 case tmrCOMMAND_CHANGE_PERIOD :
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571 pxTimer->xTimerPeriodInTicks = xMessage.xMessageValue;
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572 configASSERT( ( pxTimer->xTimerPeriodInTicks > 0 ) );
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574 /* The new period does not really have a reference, and can be
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575 longer or shorter than the old one. The command time is
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576 therefore set to the current time, and as the period cannot be
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577 zero the next expiry time can only be in the future, meaning
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578 (unlike for the xTimerStart() case above) there is no fail case
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579 that needs to be handled here. */
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580 ( void ) prvInsertTimerInActiveList( pxTimer, ( xTimeNow + pxTimer->xTimerPeriodInTicks ), xTimeNow, xTimeNow );
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583 case tmrCOMMAND_DELETE :
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584 /* The timer has already been removed from the active list,
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585 just free up the memory. */
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586 vPortFree( pxTimer );
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590 /* Don't expect to get here. */
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595 /*-----------------------------------------------------------*/
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597 static void prvSwitchTimerLists( portTickType xLastTime )
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599 portTickType xNextExpireTime, xReloadTime;
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602 portBASE_TYPE xResult;
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604 /* Remove compiler warnings if configASSERT() is not defined. */
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605 ( void ) xLastTime;
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607 /* The tick count has overflowed. The timer lists must be switched.
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608 If there are any timers still referenced from the current timer list
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609 then they must have expired and should be processed before the lists
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611 while( listLIST_IS_EMPTY( pxCurrentTimerList ) == pdFALSE )
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613 xNextExpireTime = listGET_ITEM_VALUE_OF_HEAD_ENTRY( pxCurrentTimerList );
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615 /* Remove the timer from the list. */
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616 pxTimer = ( xTIMER * ) listGET_OWNER_OF_HEAD_ENTRY( pxCurrentTimerList );
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617 ( void ) uxListRemove( &( pxTimer->xTimerListItem ) );
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619 /* Execute its callback, then send a command to restart the timer if
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620 it is an auto-reload timer. It cannot be restarted here as the lists
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621 have not yet been switched. */
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622 pxTimer->pxCallbackFunction( ( xTimerHandle ) pxTimer );
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624 if( pxTimer->uxAutoReload == ( unsigned portBASE_TYPE ) pdTRUE )
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626 /* Calculate the reload value, and if the reload value results in
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627 the timer going into the same timer list then it has already expired
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628 and the timer should be re-inserted into the current list so it is
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629 processed again within this loop. Otherwise a command should be sent
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630 to restart the timer to ensure it is only inserted into a list after
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631 the lists have been swapped. */
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632 xReloadTime = ( xNextExpireTime + pxTimer->xTimerPeriodInTicks );
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633 if( xReloadTime > xNextExpireTime )
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635 listSET_LIST_ITEM_VALUE( &( pxTimer->xTimerListItem ), xReloadTime );
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636 listSET_LIST_ITEM_OWNER( &( pxTimer->xTimerListItem ), pxTimer );
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637 vListInsert( pxCurrentTimerList, &( pxTimer->xTimerListItem ) );
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641 xResult = xTimerGenericCommand( pxTimer, tmrCOMMAND_START, xNextExpireTime, NULL, tmrNO_DELAY );
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642 configASSERT( xResult );
\r
648 pxTemp = pxCurrentTimerList;
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649 pxCurrentTimerList = pxOverflowTimerList;
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650 pxOverflowTimerList = pxTemp;
\r
652 /*-----------------------------------------------------------*/
\r
654 static void prvCheckForValidListAndQueue( void )
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656 /* Check that the list from which active timers are referenced, and the
\r
657 queue used to communicate with the timer service, have been
\r
659 taskENTER_CRITICAL();
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661 if( xTimerQueue == NULL )
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663 vListInitialise( &xActiveTimerList1 );
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664 vListInitialise( &xActiveTimerList2 );
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665 pxCurrentTimerList = &xActiveTimerList1;
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666 pxOverflowTimerList = &xActiveTimerList2;
\r
667 xTimerQueue = xQueueCreate( ( unsigned portBASE_TYPE ) configTIMER_QUEUE_LENGTH, sizeof( xTIMER_MESSAGE ) );
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670 taskEXIT_CRITICAL();
\r
672 /*-----------------------------------------------------------*/
\r
674 portBASE_TYPE xTimerIsTimerActive( xTimerHandle xTimer )
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676 portBASE_TYPE xTimerIsInActiveList;
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677 xTIMER *pxTimer = ( xTIMER * ) xTimer;
\r
679 /* Is the timer in the list of active timers? */
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680 taskENTER_CRITICAL();
\r
682 /* Checking to see if it is in the NULL list in effect checks to see if
\r
683 it is referenced from either the current or the overflow timer lists in
\r
684 one go, but the logic has to be reversed, hence the '!'. */
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685 xTimerIsInActiveList = !( listIS_CONTAINED_WITHIN( NULL, &( pxTimer->xTimerListItem ) ) );
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687 taskEXIT_CRITICAL();
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689 return xTimerIsInActiveList;
\r
691 /*-----------------------------------------------------------*/
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693 void *pvTimerGetTimerID( xTimerHandle xTimer )
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695 xTIMER *pxTimer = ( xTIMER * ) xTimer;
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697 return pxTimer->pvTimerID;
\r
699 /*-----------------------------------------------------------*/
\r
701 /* This entire source file will be skipped if the application is not configured
\r
702 to include software timer functionality. If you want to include software timer
\r
703 functionality then ensure configUSE_TIMERS is set to 1 in FreeRTOSConfig.h. */
\r
704 #endif /* configUSE_TIMERS == 1 */
\r