2 FreeRTOS V8.2.0rc1 - Copyright (C) 2014 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 This file is part of the FreeRTOS distribution.
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9 FreeRTOS is free software; you can redistribute it and/or modify it under
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10 the terms of the GNU General Public License (version 2) as published by the
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11 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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13 >>! NOTE: The modification to the GPL is included to allow you to !<<
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14 >>! distribute a combined work that includes FreeRTOS without being !<<
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15 >>! obliged to provide the source code for proprietary components !<<
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16 >>! outside of the FreeRTOS kernel. !<<
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18 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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19 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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20 FOR A PARTICULAR PURPOSE. Full license text is available on the following
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21 link: http://www.freertos.org/a00114.html
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25 ***************************************************************************
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27 * Having a problem? Start by reading the FAQ "My application does *
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28 * not run, what could be wrong?". Have you defined configASSERT()? *
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30 * http://www.FreeRTOS.org/FAQHelp.html *
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32 ***************************************************************************
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34 ***************************************************************************
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36 * FreeRTOS provides completely free yet professionally developed, *
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37 * robust, strictly quality controlled, supported, and cross *
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38 * platform software that is more than just the market leader, it *
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39 * is the industry's de facto standard. *
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41 * Help yourself get started quickly while simultaneously helping *
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42 * to support the FreeRTOS project by purchasing a FreeRTOS *
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43 * tutorial book, reference manual, or both: *
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44 * http://www.FreeRTOS.org/Documentation *
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46 ***************************************************************************
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48 ***************************************************************************
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50 * Investing in training allows your team to be as productive as *
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51 * possible as early as possible, lowering your overall development *
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52 * cost, and enabling you to bring a more robust product to market *
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53 * earlier than would otherwise be possible. Richard Barry is both *
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54 * the architect and key author of FreeRTOS, and so also the world's *
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55 * leading authority on what is the world's most popular real time *
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56 * kernel for deeply embedded MCU designs. Obtaining your training *
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57 * from Richard ensures your team will gain directly from his in-depth *
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58 * product knowledge and years of usage experience. Contact Real Time *
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59 * Engineers Ltd to enquire about the FreeRTOS Masterclass, presented *
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60 * by Richard Barry: http://www.FreeRTOS.org/contact
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62 ***************************************************************************
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64 ***************************************************************************
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66 * You are receiving this top quality software for free. Please play *
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67 * fair and reciprocate by reporting any suspected issues and *
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68 * participating in the community forum: *
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69 * http://www.FreeRTOS.org/support *
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73 ***************************************************************************
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75 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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76 license and Real Time Engineers Ltd. contact details.
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78 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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79 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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80 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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82 http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
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83 Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
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85 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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86 Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
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87 licenses offer ticketed support, indemnification and commercial middleware.
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89 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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90 engineered and independently SIL3 certified version for use in safety and
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91 mission critical applications that require provable dependability.
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96 /* Standard includes. */
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99 /* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
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100 all the API functions to use the MPU wrappers. That should only be done when
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101 task.h is included from an application file. */
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102 #define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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104 #include "FreeRTOS.h"
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107 #include "timers.h"
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109 #if ( INCLUDE_xTimerPendFunctionCall == 1 ) && ( configUSE_TIMERS == 0 )
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110 #error configUSE_TIMERS must be set to 1 to make the xTimerPendFunctionCall() function available.
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113 /* Lint e961 and e750 are suppressed as a MISRA exception justified because the
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114 MPU ports require MPU_WRAPPERS_INCLUDED_FROM_API_FILE to be defined for the
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115 header files above, but not in this file, in order to generate the correct
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116 privileged Vs unprivileged linkage and placement. */
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117 #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE /*lint !e961 !e750. */
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120 /* This entire source file will be skipped if the application is not configured
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121 to include software timer functionality. This #if is closed at the very bottom
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122 of this file. If you want to include software timer functionality then ensure
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123 configUSE_TIMERS is set to 1 in FreeRTOSConfig.h. */
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124 #if ( configUSE_TIMERS == 1 )
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126 /* Misc definitions. */
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127 #define tmrNO_DELAY ( TickType_t ) 0U
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129 /* The definition of the timers themselves. */
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130 typedef struct tmrTimerControl
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132 const char *pcTimerName; /*<< Text name. This is not used by the kernel, it is included simply to make debugging easier. */ /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
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133 ListItem_t xTimerListItem; /*<< Standard linked list item as used by all kernel features for event management. */
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134 TickType_t xTimerPeriodInTicks;/*<< How quickly and often the timer expires. */
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135 UBaseType_t 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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136 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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137 TimerCallbackFunction_t pxCallbackFunction; /*<< The function that will be called when the timer expires. */
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138 #if( configUSE_TRACE_FACILITY == 1 )
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139 UBaseType_t uxTimerNumber; /*<< An ID assigned by trace tools such as FreeRTOS+Trace */
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143 /* The old xTIMER name is maintained above then typedefed to the new Timer_t
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144 name below to enable the use of older kernel aware debuggers. */
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145 typedef xTIMER Timer_t;
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147 /* The definition of messages that can be sent and received on the timer queue.
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148 Two types of message can be queued - messages that manipulate a software timer,
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149 and messages that request the execution of a non-timer related callback. The
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150 two message types are defined in two separate structures, xTimerParametersType
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151 and xCallbackParametersType respectively. */
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152 typedef struct tmrTimerParameters
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154 TickType_t xMessageValue; /*<< An optional value used by a subset of commands, for example, when changing the period of a timer. */
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155 Timer_t * pxTimer; /*<< The timer to which the command will be applied. */
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156 } TimerParameter_t;
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159 typedef struct tmrCallbackParameters
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161 PendedFunction_t pxCallbackFunction; /* << The callback function to execute. */
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162 void *pvParameter1; /* << The value that will be used as the callback functions first parameter. */
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163 uint32_t ulParameter2; /* << The value that will be used as the callback functions second parameter. */
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164 } CallbackParameters_t;
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166 /* The structure that contains the two message types, along with an identifier
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167 that is used to determine which message type is valid. */
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168 typedef struct tmrTimerQueueMessage
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170 BaseType_t xMessageID; /*<< The command being sent to the timer service task. */
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173 TimerParameter_t xTimerParameters;
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175 /* Don't include xCallbackParameters if it is not going to be used as
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176 it makes the structure (and therefore the timer queue) larger. */
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177 #if ( INCLUDE_xTimerPendFunctionCall == 1 )
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178 CallbackParameters_t xCallbackParameters;
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179 #endif /* INCLUDE_xTimerPendFunctionCall */
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181 } DaemonTaskMessage_t;
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183 /*lint -e956 A manual analysis and inspection has been used to determine which
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184 static variables must be declared volatile. */
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186 /* The list in which active timers are stored. Timers are referenced in expire
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187 time order, with the nearest expiry time at the front of the list. Only the
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188 timer service task is allowed to access these lists. */
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189 PRIVILEGED_DATA static List_t xActiveTimerList1;
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190 PRIVILEGED_DATA static List_t xActiveTimerList2;
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191 PRIVILEGED_DATA static List_t *pxCurrentTimerList;
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192 PRIVILEGED_DATA static List_t *pxOverflowTimerList;
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194 /* A queue that is used to send commands to the timer service task. */
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195 PRIVILEGED_DATA static QueueHandle_t xTimerQueue = NULL;
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197 #if ( INCLUDE_xTimerGetTimerDaemonTaskHandle == 1 )
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199 PRIVILEGED_DATA static TaskHandle_t xTimerTaskHandle = NULL;
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205 /*-----------------------------------------------------------*/
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208 * Initialise the infrastructure used by the timer service task if it has not
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209 * been initialised already.
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211 static void prvCheckForValidListAndQueue( void ) PRIVILEGED_FUNCTION;
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214 * The timer service task (daemon). Timer functionality is controlled by this
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215 * task. Other tasks communicate with the timer service task using the
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216 * xTimerQueue queue.
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218 static void prvTimerTask( void *pvParameters ) PRIVILEGED_FUNCTION;
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221 * Called by the timer service task to interpret and process a command it
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222 * received on the timer queue.
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224 static void prvProcessReceivedCommands( void ) PRIVILEGED_FUNCTION;
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227 * Insert the timer into either xActiveTimerList1, or xActiveTimerList2,
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228 * depending on if the expire time causes a timer counter overflow.
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230 static BaseType_t prvInsertTimerInActiveList( Timer_t * const pxTimer, const TickType_t xNextExpiryTime, const TickType_t xTimeNow, const TickType_t xCommandTime ) PRIVILEGED_FUNCTION;
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233 * An active timer has reached its expire time. Reload the timer if it is an
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234 * auto reload timer, then call its callback.
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236 static void prvProcessExpiredTimer( const TickType_t xNextExpireTime, const TickType_t xTimeNow ) PRIVILEGED_FUNCTION;
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239 * The tick count has overflowed. Switch the timer lists after ensuring the
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240 * current timer list does not still reference some timers.
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242 static void prvSwitchTimerLists( void ) PRIVILEGED_FUNCTION;
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245 * Obtain the current tick count, setting *pxTimerListsWereSwitched to pdTRUE
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246 * if a tick count overflow occurred since prvSampleTimeNow() was last called.
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248 static TickType_t prvSampleTimeNow( BaseType_t * const pxTimerListsWereSwitched ) PRIVILEGED_FUNCTION;
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251 * If the timer list contains any active timers then return the expire time of
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252 * the timer that will expire first and set *pxListWasEmpty to false. If the
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253 * timer list does not contain any timers then return 0 and set *pxListWasEmpty
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256 static TickType_t prvGetNextExpireTime( BaseType_t * const pxListWasEmpty ) PRIVILEGED_FUNCTION;
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259 * If a timer has expired, process it. Otherwise, block the timer service task
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260 * until either a timer does expire or a command is received.
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262 static void prvProcessTimerOrBlockTask( const TickType_t xNextExpireTime, const BaseType_t xListWasEmpty ) PRIVILEGED_FUNCTION;
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264 /*-----------------------------------------------------------*/
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266 BaseType_t xTimerCreateTimerTask( void )
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268 BaseType_t xReturn = pdFAIL;
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270 /* This function is called when the scheduler is started if
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271 configUSE_TIMERS is set to 1. Check that the infrastructure used by the
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272 timer service task has been created/initialised. If timers have already
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273 been created then the initialisation will already have been performed. */
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274 prvCheckForValidListAndQueue();
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276 if( xTimerQueue != NULL )
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278 #if ( INCLUDE_xTimerGetTimerDaemonTaskHandle == 1 )
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280 /* Create the timer task, storing its handle in xTimerTaskHandle so
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281 it can be returned by the xTimerGetTimerDaemonTaskHandle() function. */
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282 xReturn = xTaskCreate( prvTimerTask, "Tmr Svc", ( uint16_t ) configTIMER_TASK_STACK_DEPTH, NULL, ( ( UBaseType_t ) configTIMER_TASK_PRIORITY ) | portPRIVILEGE_BIT, &xTimerTaskHandle );
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286 /* Create the timer task without storing its handle. */
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287 xReturn = xTaskCreate( prvTimerTask, "Tmr Svc", ( uint16_t ) configTIMER_TASK_STACK_DEPTH, NULL, ( ( UBaseType_t ) configTIMER_TASK_PRIORITY ) | portPRIVILEGE_BIT, NULL);
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293 mtCOVERAGE_TEST_MARKER();
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296 configASSERT( xReturn );
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299 /*-----------------------------------------------------------*/
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301 TimerHandle_t xTimerCreate( const char * const pcTimerName, const TickType_t xTimerPeriodInTicks, const UBaseType_t uxAutoReload, void * const pvTimerID, TimerCallbackFunction_t pxCallbackFunction ) /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
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303 Timer_t *pxNewTimer;
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305 /* Allocate the timer structure. */
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306 if( xTimerPeriodInTicks == ( TickType_t ) 0U )
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312 pxNewTimer = ( Timer_t * ) pvPortMalloc( sizeof( Timer_t ) );
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313 if( pxNewTimer != NULL )
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315 /* Ensure the infrastructure used by the timer service task has been
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316 created/initialised. */
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317 prvCheckForValidListAndQueue();
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319 /* Initialise the timer structure members using the function parameters. */
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320 pxNewTimer->pcTimerName = pcTimerName;
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321 pxNewTimer->xTimerPeriodInTicks = xTimerPeriodInTicks;
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322 pxNewTimer->uxAutoReload = uxAutoReload;
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323 pxNewTimer->pvTimerID = pvTimerID;
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324 pxNewTimer->pxCallbackFunction = pxCallbackFunction;
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325 vListInitialiseItem( &( pxNewTimer->xTimerListItem ) );
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327 traceTIMER_CREATE( pxNewTimer );
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331 traceTIMER_CREATE_FAILED();
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335 /* 0 is not a valid value for xTimerPeriodInTicks. */
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336 configASSERT( ( xTimerPeriodInTicks > 0 ) );
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338 return ( TimerHandle_t ) pxNewTimer;
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340 /*-----------------------------------------------------------*/
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342 BaseType_t xTimerGenericCommand( TimerHandle_t xTimer, const BaseType_t xCommandID, const TickType_t xOptionalValue, BaseType_t * const pxHigherPriorityTaskWoken, const TickType_t xTicksToWait )
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344 BaseType_t xReturn = pdFAIL;
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345 DaemonTaskMessage_t xMessage;
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347 /* Send a message to the timer service task to perform a particular action
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348 on a particular timer definition. */
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349 if( xTimerQueue != NULL )
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351 /* Send a command to the timer service task to start the xTimer timer. */
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352 xMessage.xMessageID = xCommandID;
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353 xMessage.u.xTimerParameters.xMessageValue = xOptionalValue;
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354 xMessage.u.xTimerParameters.pxTimer = ( Timer_t * ) xTimer;
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356 if( xCommandID < tmrFIRST_FROM_ISR_COMMAND )
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358 if( xTaskGetSchedulerState() == taskSCHEDULER_RUNNING )
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360 xReturn = xQueueSendToBack( xTimerQueue, &xMessage, xTicksToWait );
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364 xReturn = xQueueSendToBack( xTimerQueue, &xMessage, tmrNO_DELAY );
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369 xReturn = xQueueSendToBackFromISR( xTimerQueue, &xMessage, pxHigherPriorityTaskWoken );
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372 traceTIMER_COMMAND_SEND( xTimer, xCommandID, xOptionalValue, xReturn );
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376 mtCOVERAGE_TEST_MARKER();
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381 /*-----------------------------------------------------------*/
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383 #if ( INCLUDE_xTimerGetTimerDaemonTaskHandle == 1 )
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385 TaskHandle_t xTimerGetTimerDaemonTaskHandle( void )
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387 /* If xTimerGetTimerDaemonTaskHandle() is called before the scheduler has been
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388 started, then xTimerTaskHandle will be NULL. */
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389 configASSERT( ( xTimerTaskHandle != NULL ) );
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390 return xTimerTaskHandle;
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394 /*-----------------------------------------------------------*/
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396 const char * pcTimerGetTimerName( TimerHandle_t xTimer )
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398 Timer_t *pxTimer = ( Timer_t * ) xTimer;
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400 return pxTimer->pcTimerName;
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402 /*-----------------------------------------------------------*/
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404 static void prvProcessExpiredTimer( const TickType_t xNextExpireTime, const TickType_t xTimeNow )
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406 BaseType_t xResult;
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407 Timer_t * const pxTimer = ( Timer_t * ) listGET_OWNER_OF_HEAD_ENTRY( pxCurrentTimerList );
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409 /* Remove the timer from the list of active timers. A check has already
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410 been performed to ensure the list is not empty. */
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411 ( void ) uxListRemove( &( pxTimer->xTimerListItem ) );
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412 traceTIMER_EXPIRED( pxTimer );
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414 /* If the timer is an auto reload timer then calculate the next
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415 expiry time and re-insert the timer in the list of active timers. */
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416 if( pxTimer->uxAutoReload == ( UBaseType_t ) pdTRUE )
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418 /* The timer is inserted into a list using a time relative to anything
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419 other than the current time. It will therefore be inserted into the
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420 correct list relative to the time this task thinks it is now. */
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421 if( prvInsertTimerInActiveList( pxTimer, ( xNextExpireTime + pxTimer->xTimerPeriodInTicks ), xTimeNow, xNextExpireTime ) == pdTRUE )
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423 /* The timer expired before it was added to the active timer
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424 list. Reload it now. */
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425 xResult = xTimerGenericCommand( pxTimer, tmrCOMMAND_START_DONT_TRACE, xNextExpireTime, NULL, tmrNO_DELAY );
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426 configASSERT( xResult );
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431 mtCOVERAGE_TEST_MARKER();
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436 mtCOVERAGE_TEST_MARKER();
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439 /* Call the timer callback. */
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440 pxTimer->pxCallbackFunction( ( TimerHandle_t ) pxTimer );
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442 /*-----------------------------------------------------------*/
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444 static void prvTimerTask( void *pvParameters )
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446 TickType_t xNextExpireTime;
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447 BaseType_t xListWasEmpty;
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449 /* Just to avoid compiler warnings. */
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450 ( void ) pvParameters;
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454 /* Query the timers list to see if it contains any timers, and if so,
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455 obtain the time at which the next timer will expire. */
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456 xNextExpireTime = prvGetNextExpireTime( &xListWasEmpty );
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458 /* If a timer has expired, process it. Otherwise, block this task
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459 until either a timer does expire, or a command is received. */
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460 prvProcessTimerOrBlockTask( xNextExpireTime, xListWasEmpty );
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462 /* Empty the command queue. */
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463 prvProcessReceivedCommands();
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466 /*-----------------------------------------------------------*/
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468 static void prvProcessTimerOrBlockTask( const TickType_t xNextExpireTime, const BaseType_t xListWasEmpty )
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470 TickType_t xTimeNow;
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471 BaseType_t xTimerListsWereSwitched;
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475 /* Obtain the time now to make an assessment as to whether the timer
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476 has expired or not. If obtaining the time causes the lists to switch
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477 then don't process this timer as any timers that remained in the list
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478 when the lists were switched will have been processed within the
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479 prvSampleTimeNow() function. */
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480 xTimeNow = prvSampleTimeNow( &xTimerListsWereSwitched );
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481 if( xTimerListsWereSwitched == pdFALSE )
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483 /* The tick count has not overflowed, has the timer expired? */
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484 if( ( xListWasEmpty == pdFALSE ) && ( xNextExpireTime <= xTimeNow ) )
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486 ( void ) xTaskResumeAll();
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487 prvProcessExpiredTimer( xNextExpireTime, xTimeNow );
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491 /* The tick count has not overflowed, and the next expire
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492 time has not been reached yet. This task should therefore
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493 block to wait for the next expire time or a command to be
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494 received - whichever comes first. The following line cannot
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495 be reached unless xNextExpireTime > xTimeNow, except in the
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496 case when the current timer list is empty. */
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497 vQueueWaitForMessageRestricted( xTimerQueue, ( xNextExpireTime - xTimeNow ) );
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499 if( xTaskResumeAll() == pdFALSE )
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501 /* Yield to wait for either a command to arrive, or the
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502 block time to expire. If a command arrived between the
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503 critical section being exited and this yield then the yield
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504 will not cause the task to block. */
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505 portYIELD_WITHIN_API();
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509 mtCOVERAGE_TEST_MARKER();
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515 ( void ) xTaskResumeAll();
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519 /*-----------------------------------------------------------*/
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521 static TickType_t prvGetNextExpireTime( BaseType_t * const pxListWasEmpty )
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523 TickType_t xNextExpireTime;
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525 /* Timers are listed in expiry time order, with the head of the list
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526 referencing the task that will expire first. Obtain the time at which
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527 the timer with the nearest expiry time will expire. If there are no
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528 active timers then just set the next expire time to 0. That will cause
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529 this task to unblock when the tick count overflows, at which point the
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530 timer lists will be switched and the next expiry time can be
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532 *pxListWasEmpty = listLIST_IS_EMPTY( pxCurrentTimerList );
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533 if( *pxListWasEmpty == pdFALSE )
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535 xNextExpireTime = listGET_ITEM_VALUE_OF_HEAD_ENTRY( pxCurrentTimerList );
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539 /* Ensure the task unblocks when the tick count rolls over. */
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540 xNextExpireTime = ( TickType_t ) 0U;
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543 return xNextExpireTime;
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545 /*-----------------------------------------------------------*/
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547 static TickType_t prvSampleTimeNow( BaseType_t * const pxTimerListsWereSwitched )
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549 TickType_t xTimeNow;
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550 PRIVILEGED_DATA static TickType_t xLastTime = ( TickType_t ) 0U; /*lint !e956 Variable is only accessible to one task. */
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552 xTimeNow = xTaskGetTickCount();
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554 if( xTimeNow < xLastTime )
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556 prvSwitchTimerLists();
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557 *pxTimerListsWereSwitched = pdTRUE;
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561 *pxTimerListsWereSwitched = pdFALSE;
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564 xLastTime = xTimeNow;
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568 /*-----------------------------------------------------------*/
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570 static BaseType_t prvInsertTimerInActiveList( Timer_t * const pxTimer, const TickType_t xNextExpiryTime, const TickType_t xTimeNow, const TickType_t xCommandTime )
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572 BaseType_t xProcessTimerNow = pdFALSE;
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574 listSET_LIST_ITEM_VALUE( &( pxTimer->xTimerListItem ), xNextExpiryTime );
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575 listSET_LIST_ITEM_OWNER( &( pxTimer->xTimerListItem ), pxTimer );
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577 if( xNextExpiryTime <= xTimeNow )
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579 /* Has the expiry time elapsed between the command to start/reset a
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580 timer was issued, and the time the command was processed? */
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581 if( ( xTimeNow - xCommandTime ) >= pxTimer->xTimerPeriodInTicks )
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583 /* The time between a command being issued and the command being
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584 processed actually exceeds the timers period. */
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585 xProcessTimerNow = pdTRUE;
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589 vListInsert( pxOverflowTimerList, &( pxTimer->xTimerListItem ) );
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594 if( ( xTimeNow < xCommandTime ) && ( xNextExpiryTime >= xCommandTime ) )
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596 /* If, since the command was issued, the tick count has overflowed
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597 but the expiry time has not, then the timer must have already passed
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598 its expiry time and should be processed immediately. */
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599 xProcessTimerNow = pdTRUE;
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603 vListInsert( pxCurrentTimerList, &( pxTimer->xTimerListItem ) );
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607 return xProcessTimerNow;
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609 /*-----------------------------------------------------------*/
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611 static void prvProcessReceivedCommands( void )
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613 DaemonTaskMessage_t xMessage;
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615 BaseType_t xTimerListsWereSwitched, xResult;
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616 TickType_t xTimeNow;
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618 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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620 #if ( INCLUDE_xTimerPendFunctionCall == 1 )
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622 /* Negative commands are pended function calls rather than timer
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624 if( xMessage.xMessageID < ( BaseType_t ) 0 )
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626 const CallbackParameters_t * const pxCallback = &( xMessage.u.xCallbackParameters );
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628 /* The timer uses the xCallbackParameters member to request a
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629 callback be executed. Check the callback is not NULL. */
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630 configASSERT( pxCallback );
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632 /* Call the function. */
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633 pxCallback->pxCallbackFunction( pxCallback->pvParameter1, pxCallback->ulParameter2 );
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637 mtCOVERAGE_TEST_MARKER();
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640 #endif /* INCLUDE_xTimerPendFunctionCall */
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642 /* Commands that are positive are timer commands rather than pended
\r
644 if( xMessage.xMessageID >= ( BaseType_t ) 0 )
\r
646 /* The messages uses the xTimerParameters member to work on a
\r
648 pxTimer = xMessage.u.xTimerParameters.pxTimer;
\r
650 if( listIS_CONTAINED_WITHIN( NULL, &( pxTimer->xTimerListItem ) ) == pdFALSE )
\r
652 /* The timer is in a list, remove it. */
\r
653 ( void ) uxListRemove( &( pxTimer->xTimerListItem ) );
\r
657 mtCOVERAGE_TEST_MARKER();
\r
660 traceTIMER_COMMAND_RECEIVED( pxTimer, xMessage.xMessageID, xMessage.u.xTimerParameters.xMessageValue );
\r
662 /* In this case the xTimerListsWereSwitched parameter is not used, but
\r
663 it must be present in the function call. prvSampleTimeNow() must be
\r
664 called after the message is received from xTimerQueue so there is no
\r
665 possibility of a higher priority task adding a message to the message
\r
666 queue with a time that is ahead of the timer daemon task (because it
\r
667 pre-empted the timer daemon task after the xTimeNow value was set). */
\r
668 xTimeNow = prvSampleTimeNow( &xTimerListsWereSwitched );
\r
670 switch( xMessage.xMessageID )
\r
672 case tmrCOMMAND_START :
\r
673 case tmrCOMMAND_START_FROM_ISR :
\r
674 case tmrCOMMAND_RESET :
\r
675 case tmrCOMMAND_RESET_FROM_ISR :
\r
676 case tmrCOMMAND_START_DONT_TRACE :
\r
677 /* Start or restart a timer. */
\r
678 if( prvInsertTimerInActiveList( pxTimer, xMessage.u.xTimerParameters.xMessageValue + pxTimer->xTimerPeriodInTicks, xTimeNow, xMessage.u.xTimerParameters.xMessageValue ) == pdTRUE )
\r
680 /* The timer expired before it was added to the active
\r
681 timer list. Process it now. */
\r
682 pxTimer->pxCallbackFunction( ( TimerHandle_t ) pxTimer );
\r
683 traceTIMER_EXPIRED( pxTimer );
\r
685 if( pxTimer->uxAutoReload == ( UBaseType_t ) pdTRUE )
\r
687 xResult = xTimerGenericCommand( pxTimer, tmrCOMMAND_START_DONT_TRACE, xMessage.u.xTimerParameters.xMessageValue + pxTimer->xTimerPeriodInTicks, NULL, tmrNO_DELAY );
\r
688 configASSERT( xResult );
\r
693 mtCOVERAGE_TEST_MARKER();
\r
698 mtCOVERAGE_TEST_MARKER();
\r
702 case tmrCOMMAND_STOP :
\r
703 case tmrCOMMAND_STOP_FROM_ISR :
\r
704 /* The timer has already been removed from the active list.
\r
705 There is nothing to do here. */
\r
708 case tmrCOMMAND_CHANGE_PERIOD :
\r
709 case tmrCOMMAND_CHANGE_PERIOD_FROM_ISR :
\r
710 pxTimer->xTimerPeriodInTicks = xMessage.u.xTimerParameters.xMessageValue;
\r
711 configASSERT( ( pxTimer->xTimerPeriodInTicks > 0 ) );
\r
713 /* The new period does not really have a reference, and can be
\r
714 longer or shorter than the old one. The command time is
\r
715 therefore set to the current time, and as the period cannot be
\r
716 zero the next expiry time can only be in the future, meaning
\r
717 (unlike for the xTimerStart() case above) there is no fail case
\r
718 that needs to be handled here. */
\r
719 ( void ) prvInsertTimerInActiveList( pxTimer, ( xTimeNow + pxTimer->xTimerPeriodInTicks ), xTimeNow, xTimeNow );
\r
722 case tmrCOMMAND_DELETE :
\r
723 /* The timer has already been removed from the active list,
\r
724 just free up the memory. */
\r
725 vPortFree( pxTimer );
\r
729 /* Don't expect to get here. */
\r
735 /*-----------------------------------------------------------*/
\r
737 static void prvSwitchTimerLists( void )
\r
739 TickType_t xNextExpireTime, xReloadTime;
\r
742 BaseType_t xResult;
\r
744 /* The tick count has overflowed. The timer lists must be switched.
\r
745 If there are any timers still referenced from the current timer list
\r
746 then they must have expired and should be processed before the lists
\r
748 while( listLIST_IS_EMPTY( pxCurrentTimerList ) == pdFALSE )
\r
750 xNextExpireTime = listGET_ITEM_VALUE_OF_HEAD_ENTRY( pxCurrentTimerList );
\r
752 /* Remove the timer from the list. */
\r
753 pxTimer = ( Timer_t * ) listGET_OWNER_OF_HEAD_ENTRY( pxCurrentTimerList );
\r
754 ( void ) uxListRemove( &( pxTimer->xTimerListItem ) );
\r
755 traceTIMER_EXPIRED( pxTimer );
\r
757 /* Execute its callback, then send a command to restart the timer if
\r
758 it is an auto-reload timer. It cannot be restarted here as the lists
\r
759 have not yet been switched. */
\r
760 pxTimer->pxCallbackFunction( ( TimerHandle_t ) pxTimer );
\r
762 if( pxTimer->uxAutoReload == ( UBaseType_t ) pdTRUE )
\r
764 /* Calculate the reload value, and if the reload value results in
\r
765 the timer going into the same timer list then it has already expired
\r
766 and the timer should be re-inserted into the current list so it is
\r
767 processed again within this loop. Otherwise a command should be sent
\r
768 to restart the timer to ensure it is only inserted into a list after
\r
769 the lists have been swapped. */
\r
770 xReloadTime = ( xNextExpireTime + pxTimer->xTimerPeriodInTicks );
\r
771 if( xReloadTime > xNextExpireTime )
\r
773 listSET_LIST_ITEM_VALUE( &( pxTimer->xTimerListItem ), xReloadTime );
\r
774 listSET_LIST_ITEM_OWNER( &( pxTimer->xTimerListItem ), pxTimer );
\r
775 vListInsert( pxCurrentTimerList, &( pxTimer->xTimerListItem ) );
\r
779 xResult = xTimerGenericCommand( pxTimer, tmrCOMMAND_START_DONT_TRACE, xNextExpireTime, NULL, tmrNO_DELAY );
\r
780 configASSERT( xResult );
\r
786 mtCOVERAGE_TEST_MARKER();
\r
790 pxTemp = pxCurrentTimerList;
\r
791 pxCurrentTimerList = pxOverflowTimerList;
\r
792 pxOverflowTimerList = pxTemp;
\r
794 /*-----------------------------------------------------------*/
\r
796 static void prvCheckForValidListAndQueue( void )
\r
798 /* Check that the list from which active timers are referenced, and the
\r
799 queue used to communicate with the timer service, have been
\r
801 taskENTER_CRITICAL();
\r
803 if( xTimerQueue == NULL )
\r
805 vListInitialise( &xActiveTimerList1 );
\r
806 vListInitialise( &xActiveTimerList2 );
\r
807 pxCurrentTimerList = &xActiveTimerList1;
\r
808 pxOverflowTimerList = &xActiveTimerList2;
\r
809 xTimerQueue = xQueueCreate( ( UBaseType_t ) configTIMER_QUEUE_LENGTH, sizeof( DaemonTaskMessage_t ) );
\r
810 configASSERT( xTimerQueue );
\r
812 #if ( configQUEUE_REGISTRY_SIZE > 0 )
\r
814 if( xTimerQueue != NULL )
\r
816 vQueueAddToRegistry( xTimerQueue, "TmrQ" );
\r
820 mtCOVERAGE_TEST_MARKER();
\r
823 #endif /* configQUEUE_REGISTRY_SIZE */
\r
827 mtCOVERAGE_TEST_MARKER();
\r
830 taskEXIT_CRITICAL();
\r
832 /*-----------------------------------------------------------*/
\r
834 BaseType_t xTimerIsTimerActive( TimerHandle_t xTimer )
\r
836 BaseType_t xTimerIsInActiveList;
\r
837 Timer_t *pxTimer = ( Timer_t * ) xTimer;
\r
839 /* Is the timer in the list of active timers? */
\r
840 taskENTER_CRITICAL();
\r
842 /* Checking to see if it is in the NULL list in effect checks to see if
\r
843 it is referenced from either the current or the overflow timer lists in
\r
844 one go, but the logic has to be reversed, hence the '!'. */
\r
845 xTimerIsInActiveList = ( BaseType_t ) !( listIS_CONTAINED_WITHIN( NULL, &( pxTimer->xTimerListItem ) ) );
\r
847 taskEXIT_CRITICAL();
\r
849 return xTimerIsInActiveList;
\r
850 } /*lint !e818 Can't be pointer to const due to the typedef. */
\r
851 /*-----------------------------------------------------------*/
\r
853 void *pvTimerGetTimerID( const TimerHandle_t xTimer )
\r
855 Timer_t * const pxTimer = ( Timer_t * ) xTimer;
\r
857 return pxTimer->pvTimerID;
\r
859 /*-----------------------------------------------------------*/
\r
861 #if( INCLUDE_xTimerPendFunctionCall == 1 )
\r
863 BaseType_t xTimerPendFunctionCallFromISR( PendedFunction_t xFunctionToPend, void *pvParameter1, uint32_t ulParameter2, BaseType_t *pxHigherPriorityTaskWoken )
\r
865 DaemonTaskMessage_t xMessage;
\r
866 BaseType_t xReturn;
\r
868 /* Complete the message with the function parameters and post it to the
\r
870 xMessage.xMessageID = tmrCOMMAND_EXECUTE_CALLBACK_FROM_ISR;
\r
871 xMessage.u.xCallbackParameters.pxCallbackFunction = xFunctionToPend;
\r
872 xMessage.u.xCallbackParameters.pvParameter1 = pvParameter1;
\r
873 xMessage.u.xCallbackParameters.ulParameter2 = ulParameter2;
\r
875 xReturn = xQueueSendFromISR( xTimerQueue, &xMessage, pxHigherPriorityTaskWoken );
\r
877 tracePEND_FUNC_CALL_FROM_ISR( xFunctionToPend, pvParameter1, ulParameter2, xReturn );
\r
882 #endif /* INCLUDE_xTimerPendFunctionCall */
\r
883 /*-----------------------------------------------------------*/
\r
885 #if( INCLUDE_xTimerPendFunctionCall == 1 )
\r
887 BaseType_t xTimerPendFunctionCall( PendedFunction_t xFunctionToPend, void *pvParameter1, uint32_t ulParameter2, TickType_t xTicksToWait )
\r
889 DaemonTaskMessage_t xMessage;
\r
890 BaseType_t xReturn;
\r
892 /* Complete the message with the function parameters and post it to the
\r
894 xMessage.xMessageID = tmrCOMMAND_EXECUTE_CALLBACK;
\r
895 xMessage.u.xCallbackParameters.pxCallbackFunction = xFunctionToPend;
\r
896 xMessage.u.xCallbackParameters.pvParameter1 = pvParameter1;
\r
897 xMessage.u.xCallbackParameters.ulParameter2 = ulParameter2;
\r
899 xReturn = xQueueSendToBack( xTimerQueue, &xMessage, xTicksToWait );
\r
901 tracePEND_FUNC_CALL( xFunctionToPend, pvParameter1, ulParameter2, xReturn );
\r
906 #endif /* INCLUDE_xTimerPendFunctionCall */
\r
907 /*-----------------------------------------------------------*/
\r
909 /* This entire source file will be skipped if the application is not configured
\r
910 to include software timer functionality. If you want to include software timer
\r
911 functionality then ensure configUSE_TIMERS is set to 1 in FreeRTOSConfig.h. */
\r
912 #endif /* configUSE_TIMERS == 1 */
\r