2 * FreeRTOS Kernel V10.5.1
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3 * Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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5 * SPDX-License-Identifier: MIT
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy of
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8 * this software and associated documentation files (the "Software"), to deal in
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9 * the Software without restriction, including without limitation the rights to
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10 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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11 * the Software, and to permit persons to whom the Software is furnished to do so,
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12 * subject to the following conditions:
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14 * The above copyright notice and this permission notice shall be included in all
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15 * copies or substantial portions of the Software.
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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19 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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20 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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21 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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24 * https://www.FreeRTOS.org
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25 * https://github.com/FreeRTOS
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29 /* Standard includes. */
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32 /* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
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33 * all the API functions to use the MPU wrappers. That should only be done when
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34 * task.h is included from an application file. */
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35 #define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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37 #include "FreeRTOS.h"
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42 #if ( INCLUDE_xTimerPendFunctionCall == 1 ) && ( configUSE_TIMERS == 0 )
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43 #error configUSE_TIMERS must be set to 1 to make the xTimerPendFunctionCall() function available.
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46 /* Lint e9021, e961 and e750 are suppressed as a MISRA exception justified
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47 * because the MPU ports require MPU_WRAPPERS_INCLUDED_FROM_API_FILE to be defined
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48 * for the header files above, but not in this file, in order to generate the
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49 * correct privileged Vs unprivileged linkage and placement. */
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50 #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE /*lint !e9021 !e961 !e750. */
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53 /* This entire source file will be skipped if the application is not configured
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54 * to include software timer functionality. This #if is closed at the very bottom
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55 * of this file. If you want to include software timer functionality then ensure
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56 * configUSE_TIMERS is set to 1 in FreeRTOSConfig.h. */
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57 #if ( configUSE_TIMERS == 1 )
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59 /* Misc definitions. */
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60 #define tmrNO_DELAY ( ( TickType_t ) 0U )
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61 #define tmrMAX_TIME_BEFORE_OVERFLOW ( ( TickType_t ) -1 )
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63 /* The name assigned to the timer service task. This can be overridden by
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64 * defining trmTIMER_SERVICE_TASK_NAME in FreeRTOSConfig.h. */
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65 #ifndef configTIMER_SERVICE_TASK_NAME
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66 #define configTIMER_SERVICE_TASK_NAME "Tmr Svc"
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69 /* Bit definitions used in the ucStatus member of a timer structure. */
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70 #define tmrSTATUS_IS_ACTIVE ( ( uint8_t ) 0x01 )
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71 #define tmrSTATUS_IS_STATICALLY_ALLOCATED ( ( uint8_t ) 0x02 )
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72 #define tmrSTATUS_IS_AUTORELOAD ( ( uint8_t ) 0x04 )
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74 /* The definition of the timers themselves. */
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75 typedef struct tmrTimerControl /* The old naming convention is used to prevent breaking kernel aware debuggers. */
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77 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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78 ListItem_t xTimerListItem; /*<< Standard linked list item as used by all kernel features for event management. */
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79 TickType_t xTimerPeriodInTicks; /*<< How quickly and often the timer expires. */
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80 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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81 TimerCallbackFunction_t pxCallbackFunction; /*<< The function that will be called when the timer expires. */
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82 #if ( configUSE_TRACE_FACILITY == 1 )
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83 UBaseType_t uxTimerNumber; /*<< An ID assigned by trace tools such as FreeRTOS+Trace */
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85 uint8_t ucStatus; /*<< Holds bits to say if the timer was statically allocated or not, and if it is active or not. */
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88 /* The old xTIMER name is maintained above then typedefed to the new Timer_t
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89 * name below to enable the use of older kernel aware debuggers. */
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90 typedef xTIMER Timer_t;
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92 /* The definition of messages that can be sent and received on the timer queue.
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93 * Two types of message can be queued - messages that manipulate a software timer,
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94 * and messages that request the execution of a non-timer related callback. The
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95 * two message types are defined in two separate structures, xTimerParametersType
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96 * and xCallbackParametersType respectively. */
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97 typedef struct tmrTimerParameters
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99 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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100 Timer_t * pxTimer; /*<< The timer to which the command will be applied. */
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101 } TimerParameter_t;
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104 typedef struct tmrCallbackParameters
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106 PendedFunction_t pxCallbackFunction; /* << The callback function to execute. */
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107 void * pvParameter1; /* << The value that will be used as the callback functions first parameter. */
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108 uint32_t ulParameter2; /* << The value that will be used as the callback functions second parameter. */
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109 } CallbackParameters_t;
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111 /* The structure that contains the two message types, along with an identifier
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112 * that is used to determine which message type is valid. */
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113 typedef struct tmrTimerQueueMessage
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115 BaseType_t xMessageID; /*<< The command being sent to the timer service task. */
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118 TimerParameter_t xTimerParameters;
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120 /* Don't include xCallbackParameters if it is not going to be used as
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121 * it makes the structure (and therefore the timer queue) larger. */
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122 #if ( INCLUDE_xTimerPendFunctionCall == 1 )
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123 CallbackParameters_t xCallbackParameters;
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124 #endif /* INCLUDE_xTimerPendFunctionCall */
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126 } DaemonTaskMessage_t;
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128 /*lint -save -e956 A manual analysis and inspection has been used to determine
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129 * which static variables must be declared volatile. */
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131 /* The list in which active timers are stored. Timers are referenced in expire
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132 * time order, with the nearest expiry time at the front of the list. Only the
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133 * timer service task is allowed to access these lists.
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134 * xActiveTimerList1 and xActiveTimerList2 could be at function scope but that
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135 * breaks some kernel aware debuggers, and debuggers that reply on removing the
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136 * static qualifier. */
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137 PRIVILEGED_DATA static List_t xActiveTimerList1;
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138 PRIVILEGED_DATA static List_t xActiveTimerList2;
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139 PRIVILEGED_DATA static List_t * pxCurrentTimerList;
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140 PRIVILEGED_DATA static List_t * pxOverflowTimerList;
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142 /* A queue that is used to send commands to the timer service task. */
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143 PRIVILEGED_DATA static QueueHandle_t xTimerQueue = NULL;
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144 PRIVILEGED_DATA static TaskHandle_t xTimerTaskHandle = NULL;
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148 /*-----------------------------------------------------------*/
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151 * Initialise the infrastructure used by the timer service task if it has not
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152 * been initialised already.
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154 static void prvCheckForValidListAndQueue( void ) PRIVILEGED_FUNCTION;
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157 * The timer service task (daemon). Timer functionality is controlled by this
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158 * task. Other tasks communicate with the timer service task using the
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159 * xTimerQueue queue.
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161 static portTASK_FUNCTION_PROTO( prvTimerTask, pvParameters ) PRIVILEGED_FUNCTION;
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164 * Called by the timer service task to interpret and process a command it
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165 * received on the timer queue.
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167 static void prvProcessReceivedCommands( void ) PRIVILEGED_FUNCTION;
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170 * Insert the timer into either xActiveTimerList1, or xActiveTimerList2,
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171 * depending on if the expire time causes a timer counter overflow.
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173 static BaseType_t prvInsertTimerInActiveList( Timer_t * const pxTimer,
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174 const TickType_t xNextExpiryTime,
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175 const TickType_t xTimeNow,
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176 const TickType_t xCommandTime ) PRIVILEGED_FUNCTION;
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179 * Reload the specified auto-reload timer. If the reloading is backlogged,
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180 * clear the backlog, calling the callback for each additional reload. When
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181 * this function returns, the next expiry time is after xTimeNow.
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183 static void prvReloadTimer( Timer_t * const pxTimer,
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184 TickType_t xExpiredTime,
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185 const TickType_t xTimeNow ) PRIVILEGED_FUNCTION;
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188 * An active timer has reached its expire time. Reload the timer if it is an
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189 * auto-reload timer, then call its callback.
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191 static void prvProcessExpiredTimer( const TickType_t xNextExpireTime,
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192 const TickType_t xTimeNow ) PRIVILEGED_FUNCTION;
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195 * The tick count has overflowed. Switch the timer lists after ensuring the
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196 * current timer list does not still reference some timers.
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198 static void prvSwitchTimerLists( void ) PRIVILEGED_FUNCTION;
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201 * Obtain the current tick count, setting *pxTimerListsWereSwitched to pdTRUE
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202 * if a tick count overflow occurred since prvSampleTimeNow() was last called.
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204 static TickType_t prvSampleTimeNow( BaseType_t * const pxTimerListsWereSwitched ) PRIVILEGED_FUNCTION;
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207 * If the timer list contains any active timers then return the expire time of
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208 * the timer that will expire first and set *pxListWasEmpty to false. If the
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209 * timer list does not contain any timers then return 0 and set *pxListWasEmpty
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212 static TickType_t prvGetNextExpireTime( BaseType_t * const pxListWasEmpty ) PRIVILEGED_FUNCTION;
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215 * If a timer has expired, process it. Otherwise, block the timer service task
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216 * until either a timer does expire or a command is received.
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218 static void prvProcessTimerOrBlockTask( const TickType_t xNextExpireTime,
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219 BaseType_t xListWasEmpty ) PRIVILEGED_FUNCTION;
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222 * Called after a Timer_t structure has been allocated either statically or
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223 * dynamically to fill in the structure's members.
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225 static void prvInitialiseNewTimer( const char * const pcTimerName, /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
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226 const TickType_t xTimerPeriodInTicks,
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227 const BaseType_t xAutoReload,
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228 void * const pvTimerID,
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229 TimerCallbackFunction_t pxCallbackFunction,
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230 Timer_t * pxNewTimer ) PRIVILEGED_FUNCTION;
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231 /*-----------------------------------------------------------*/
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233 BaseType_t xTimerCreateTimerTask( void )
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235 BaseType_t xReturn = pdFAIL;
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237 /* This function is called when the scheduler is started if
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238 * configUSE_TIMERS is set to 1. Check that the infrastructure used by the
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239 * timer service task has been created/initialised. If timers have already
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240 * been created then the initialisation will already have been performed. */
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241 prvCheckForValidListAndQueue();
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243 if( xTimerQueue != NULL )
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245 #if ( configSUPPORT_STATIC_ALLOCATION == 1 )
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247 StaticTask_t * pxTimerTaskTCBBuffer = NULL;
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248 StackType_t * pxTimerTaskStackBuffer = NULL;
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249 uint32_t ulTimerTaskStackSize;
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251 vApplicationGetTimerTaskMemory( &pxTimerTaskTCBBuffer, &pxTimerTaskStackBuffer, &ulTimerTaskStackSize );
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252 xTimerTaskHandle = xTaskCreateStatic( prvTimerTask,
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253 configTIMER_SERVICE_TASK_NAME,
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254 ulTimerTaskStackSize,
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256 ( ( UBaseType_t ) configTIMER_TASK_PRIORITY ) | portPRIVILEGE_BIT,
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257 pxTimerTaskStackBuffer,
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258 pxTimerTaskTCBBuffer );
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260 if( xTimerTaskHandle != NULL )
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265 #else /* if ( configSUPPORT_STATIC_ALLOCATION == 1 ) */
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267 xReturn = xTaskCreate( prvTimerTask,
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268 configTIMER_SERVICE_TASK_NAME,
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269 configTIMER_TASK_STACK_DEPTH,
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271 ( ( UBaseType_t ) configTIMER_TASK_PRIORITY ) | portPRIVILEGE_BIT,
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272 &xTimerTaskHandle );
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274 #endif /* configSUPPORT_STATIC_ALLOCATION */
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278 mtCOVERAGE_TEST_MARKER();
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281 configASSERT( xReturn );
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284 /*-----------------------------------------------------------*/
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286 #if ( configSUPPORT_DYNAMIC_ALLOCATION == 1 )
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288 TimerHandle_t xTimerCreate( const char * const pcTimerName, /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
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289 const TickType_t xTimerPeriodInTicks,
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290 const BaseType_t xAutoReload,
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291 void * const pvTimerID,
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292 TimerCallbackFunction_t pxCallbackFunction )
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294 Timer_t * pxNewTimer;
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296 pxNewTimer = ( Timer_t * ) pvPortMalloc( sizeof( Timer_t ) ); /*lint !e9087 !e9079 All values returned by pvPortMalloc() have at least the alignment required by the MCU's stack, and the first member of Timer_t is always a pointer to the timer's mame. */
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298 if( pxNewTimer != NULL )
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300 /* Status is thus far zero as the timer is not created statically
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301 * and has not been started. The auto-reload bit may get set in
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302 * prvInitialiseNewTimer. */
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303 pxNewTimer->ucStatus = 0x00;
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304 prvInitialiseNewTimer( pcTimerName, xTimerPeriodInTicks, xAutoReload, pvTimerID, pxCallbackFunction, pxNewTimer );
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310 #endif /* configSUPPORT_DYNAMIC_ALLOCATION */
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311 /*-----------------------------------------------------------*/
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313 #if ( configSUPPORT_STATIC_ALLOCATION == 1 )
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315 TimerHandle_t xTimerCreateStatic( const char * const pcTimerName, /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
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316 const TickType_t xTimerPeriodInTicks,
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317 const BaseType_t xAutoReload,
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318 void * const pvTimerID,
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319 TimerCallbackFunction_t pxCallbackFunction,
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320 StaticTimer_t * pxTimerBuffer )
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322 Timer_t * pxNewTimer;
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324 #if ( configASSERT_DEFINED == 1 )
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326 /* Sanity check that the size of the structure used to declare a
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327 * variable of type StaticTimer_t equals the size of the real timer
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329 volatile size_t xSize = sizeof( StaticTimer_t );
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330 configASSERT( xSize == sizeof( Timer_t ) );
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331 ( void ) xSize; /* Keeps lint quiet when configASSERT() is not defined. */
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333 #endif /* configASSERT_DEFINED */
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335 /* A pointer to a StaticTimer_t structure MUST be provided, use it. */
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336 configASSERT( pxTimerBuffer );
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337 pxNewTimer = ( Timer_t * ) pxTimerBuffer; /*lint !e740 !e9087 StaticTimer_t is a pointer to a Timer_t, so guaranteed to be aligned and sized correctly (checked by an assert()), so this is safe. */
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339 if( pxNewTimer != NULL )
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341 /* Timers can be created statically or dynamically so note this
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342 * timer was created statically in case it is later deleted. The
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343 * auto-reload bit may get set in prvInitialiseNewTimer(). */
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344 pxNewTimer->ucStatus = tmrSTATUS_IS_STATICALLY_ALLOCATED;
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346 prvInitialiseNewTimer( pcTimerName, xTimerPeriodInTicks, xAutoReload, pvTimerID, pxCallbackFunction, pxNewTimer );
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352 #endif /* configSUPPORT_STATIC_ALLOCATION */
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353 /*-----------------------------------------------------------*/
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355 static void prvInitialiseNewTimer( const char * const pcTimerName, /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
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356 const TickType_t xTimerPeriodInTicks,
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357 const BaseType_t xAutoReload,
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358 void * const pvTimerID,
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359 TimerCallbackFunction_t pxCallbackFunction,
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360 Timer_t * pxNewTimer )
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362 /* 0 is not a valid value for xTimerPeriodInTicks. */
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363 configASSERT( ( xTimerPeriodInTicks > 0 ) );
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365 /* Ensure the infrastructure used by the timer service task has been
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366 * created/initialised. */
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367 prvCheckForValidListAndQueue();
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369 /* Initialise the timer structure members using the function
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371 pxNewTimer->pcTimerName = pcTimerName;
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372 pxNewTimer->xTimerPeriodInTicks = xTimerPeriodInTicks;
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373 pxNewTimer->pvTimerID = pvTimerID;
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374 pxNewTimer->pxCallbackFunction = pxCallbackFunction;
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375 vListInitialiseItem( &( pxNewTimer->xTimerListItem ) );
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377 if( xAutoReload != pdFALSE )
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379 pxNewTimer->ucStatus |= tmrSTATUS_IS_AUTORELOAD;
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382 traceTIMER_CREATE( pxNewTimer );
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384 /*-----------------------------------------------------------*/
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386 BaseType_t xTimerGenericCommand( TimerHandle_t xTimer,
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387 const BaseType_t xCommandID,
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388 const TickType_t xOptionalValue,
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389 BaseType_t * const pxHigherPriorityTaskWoken,
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390 const TickType_t xTicksToWait )
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392 BaseType_t xReturn = pdFAIL;
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393 DaemonTaskMessage_t xMessage;
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395 configASSERT( xTimer );
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397 /* Send a message to the timer service task to perform a particular action
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398 * on a particular timer definition. */
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399 if( xTimerQueue != NULL )
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401 /* Send a command to the timer service task to start the xTimer timer. */
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402 xMessage.xMessageID = xCommandID;
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403 xMessage.u.xTimerParameters.xMessageValue = xOptionalValue;
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404 xMessage.u.xTimerParameters.pxTimer = xTimer;
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406 if( xCommandID < tmrFIRST_FROM_ISR_COMMAND )
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408 if( xTaskGetSchedulerState() == taskSCHEDULER_RUNNING )
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410 xReturn = xQueueSendToBack( xTimerQueue, &xMessage, xTicksToWait );
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414 xReturn = xQueueSendToBack( xTimerQueue, &xMessage, tmrNO_DELAY );
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419 xReturn = xQueueSendToBackFromISR( xTimerQueue, &xMessage, pxHigherPriorityTaskWoken );
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422 traceTIMER_COMMAND_SEND( xTimer, xCommandID, xOptionalValue, xReturn );
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426 mtCOVERAGE_TEST_MARKER();
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431 /*-----------------------------------------------------------*/
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433 TaskHandle_t xTimerGetTimerDaemonTaskHandle( void )
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435 /* If xTimerGetTimerDaemonTaskHandle() is called before the scheduler has been
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436 * started, then xTimerTaskHandle will be NULL. */
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437 configASSERT( ( xTimerTaskHandle != NULL ) );
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438 return xTimerTaskHandle;
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440 /*-----------------------------------------------------------*/
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442 TickType_t xTimerGetPeriod( TimerHandle_t xTimer )
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444 Timer_t * pxTimer = xTimer;
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446 configASSERT( xTimer );
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447 return pxTimer->xTimerPeriodInTicks;
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449 /*-----------------------------------------------------------*/
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451 void vTimerSetReloadMode( TimerHandle_t xTimer,
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452 const BaseType_t xAutoReload )
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454 Timer_t * pxTimer = xTimer;
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456 configASSERT( xTimer );
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457 taskENTER_CRITICAL();
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459 if( xAutoReload != pdFALSE )
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461 pxTimer->ucStatus |= tmrSTATUS_IS_AUTORELOAD;
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465 pxTimer->ucStatus &= ( ( uint8_t ) ~tmrSTATUS_IS_AUTORELOAD );
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468 taskEXIT_CRITICAL();
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470 /*-----------------------------------------------------------*/
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472 BaseType_t xTimerGetReloadMode( TimerHandle_t xTimer )
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474 Timer_t * pxTimer = xTimer;
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475 BaseType_t xReturn;
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477 configASSERT( xTimer );
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478 taskENTER_CRITICAL();
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480 if( ( pxTimer->ucStatus & tmrSTATUS_IS_AUTORELOAD ) == 0 )
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482 /* Not an auto-reload timer. */
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487 /* Is an auto-reload timer. */
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491 taskEXIT_CRITICAL();
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496 UBaseType_t uxTimerGetReloadMode( TimerHandle_t xTimer )
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498 return ( UBaseType_t ) xTimerGetReloadMode( xTimer );
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500 /*-----------------------------------------------------------*/
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502 TickType_t xTimerGetExpiryTime( TimerHandle_t xTimer )
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504 Timer_t * pxTimer = xTimer;
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505 TickType_t xReturn;
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507 configASSERT( xTimer );
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508 xReturn = listGET_LIST_ITEM_VALUE( &( pxTimer->xTimerListItem ) );
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511 /*-----------------------------------------------------------*/
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513 const char * pcTimerGetName( TimerHandle_t xTimer ) /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
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515 Timer_t * pxTimer = xTimer;
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517 configASSERT( xTimer );
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518 return pxTimer->pcTimerName;
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520 /*-----------------------------------------------------------*/
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522 static void prvReloadTimer( Timer_t * const pxTimer,
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523 TickType_t xExpiredTime,
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524 const TickType_t xTimeNow )
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526 /* Insert the timer into the appropriate list for the next expiry time.
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527 * If the next expiry time has already passed, advance the expiry time,
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528 * call the callback function, and try again. */
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529 while( prvInsertTimerInActiveList( pxTimer, ( xExpiredTime + pxTimer->xTimerPeriodInTicks ), xTimeNow, xExpiredTime ) != pdFALSE )
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531 /* Advance the expiry time. */
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532 xExpiredTime += pxTimer->xTimerPeriodInTicks;
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534 /* Call the timer callback. */
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535 traceTIMER_EXPIRED( pxTimer );
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536 pxTimer->pxCallbackFunction( ( TimerHandle_t ) pxTimer );
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539 /*-----------------------------------------------------------*/
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541 static void prvProcessExpiredTimer( const TickType_t xNextExpireTime,
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542 const TickType_t xTimeNow )
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544 Timer_t * const pxTimer = ( Timer_t * ) listGET_OWNER_OF_HEAD_ENTRY( pxCurrentTimerList ); /*lint !e9087 !e9079 void * is used as this macro is used with tasks and co-routines too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
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546 /* Remove the timer from the list of active timers. A check has already
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547 * been performed to ensure the list is not empty. */
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549 ( void ) uxListRemove( &( pxTimer->xTimerListItem ) );
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551 /* If the timer is an auto-reload timer then calculate the next
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552 * expiry time and re-insert the timer in the list of active timers. */
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553 if( ( pxTimer->ucStatus & tmrSTATUS_IS_AUTORELOAD ) != 0 )
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555 prvReloadTimer( pxTimer, xNextExpireTime, xTimeNow );
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559 pxTimer->ucStatus &= ( ( uint8_t ) ~tmrSTATUS_IS_ACTIVE );
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562 /* Call the timer callback. */
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563 traceTIMER_EXPIRED( pxTimer );
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564 pxTimer->pxCallbackFunction( ( TimerHandle_t ) pxTimer );
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566 /*-----------------------------------------------------------*/
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568 static portTASK_FUNCTION( prvTimerTask, pvParameters )
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570 TickType_t xNextExpireTime;
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571 BaseType_t xListWasEmpty;
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573 /* Just to avoid compiler warnings. */
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574 ( void ) pvParameters;
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576 #if ( configUSE_DAEMON_TASK_STARTUP_HOOK == 1 )
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578 extern void vApplicationDaemonTaskStartupHook( void );
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580 /* Allow the application writer to execute some code in the context of
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581 * this task at the point the task starts executing. This is useful if the
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582 * application includes initialisation code that would benefit from
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583 * executing after the scheduler has been started. */
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584 vApplicationDaemonTaskStartupHook();
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586 #endif /* configUSE_DAEMON_TASK_STARTUP_HOOK */
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590 /* Query the timers list to see if it contains any timers, and if so,
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591 * obtain the time at which the next timer will expire. */
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592 xNextExpireTime = prvGetNextExpireTime( &xListWasEmpty );
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594 /* If a timer has expired, process it. Otherwise, block this task
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595 * until either a timer does expire, or a command is received. */
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596 prvProcessTimerOrBlockTask( xNextExpireTime, xListWasEmpty );
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598 /* Empty the command queue. */
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599 prvProcessReceivedCommands();
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602 /*-----------------------------------------------------------*/
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604 static void prvProcessTimerOrBlockTask( const TickType_t xNextExpireTime,
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605 BaseType_t xListWasEmpty )
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607 TickType_t xTimeNow;
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608 BaseType_t xTimerListsWereSwitched;
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612 /* Obtain the time now to make an assessment as to whether the timer
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613 * has expired or not. If obtaining the time causes the lists to switch
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614 * then don't process this timer as any timers that remained in the list
\r
615 * when the lists were switched will have been processed within the
\r
616 * prvSampleTimeNow() function. */
\r
617 xTimeNow = prvSampleTimeNow( &xTimerListsWereSwitched );
\r
619 if( xTimerListsWereSwitched == pdFALSE )
\r
621 /* The tick count has not overflowed, has the timer expired? */
\r
622 if( ( xListWasEmpty == pdFALSE ) && ( xNextExpireTime <= xTimeNow ) )
\r
624 ( void ) xTaskResumeAll();
\r
625 prvProcessExpiredTimer( xNextExpireTime, xTimeNow );
\r
629 /* The tick count has not overflowed, and the next expire
\r
630 * time has not been reached yet. This task should therefore
\r
631 * block to wait for the next expire time or a command to be
\r
632 * received - whichever comes first. The following line cannot
\r
633 * be reached unless xNextExpireTime > xTimeNow, except in the
\r
634 * case when the current timer list is empty. */
\r
635 if( xListWasEmpty != pdFALSE )
\r
637 /* The current timer list is empty - is the overflow list
\r
639 xListWasEmpty = listLIST_IS_EMPTY( pxOverflowTimerList );
\r
642 vQueueWaitForMessageRestricted( xTimerQueue, ( xNextExpireTime - xTimeNow ), xListWasEmpty );
\r
644 if( xTaskResumeAll() == pdFALSE )
\r
646 /* Yield to wait for either a command to arrive, or the
\r
647 * block time to expire. If a command arrived between the
\r
648 * critical section being exited and this yield then the yield
\r
649 * will not cause the task to block. */
\r
650 portYIELD_WITHIN_API();
\r
654 mtCOVERAGE_TEST_MARKER();
\r
660 ( void ) xTaskResumeAll();
\r
664 /*-----------------------------------------------------------*/
\r
666 static TickType_t prvGetNextExpireTime( BaseType_t * const pxListWasEmpty )
\r
668 TickType_t xNextExpireTime;
\r
670 /* Timers are listed in expiry time order, with the head of the list
\r
671 * referencing the task that will expire first. Obtain the time at which
\r
672 * the timer with the nearest expiry time will expire. If there are no
\r
673 * active timers then just set the next expire time to 0. That will cause
\r
674 * this task to unblock when the tick count overflows, at which point the
\r
675 * timer lists will be switched and the next expiry time can be
\r
677 *pxListWasEmpty = listLIST_IS_EMPTY( pxCurrentTimerList );
\r
679 if( *pxListWasEmpty == pdFALSE )
\r
681 xNextExpireTime = listGET_ITEM_VALUE_OF_HEAD_ENTRY( pxCurrentTimerList );
\r
685 /* Ensure the task unblocks when the tick count rolls over. */
\r
686 xNextExpireTime = ( TickType_t ) 0U;
\r
689 return xNextExpireTime;
\r
691 /*-----------------------------------------------------------*/
\r
693 static TickType_t prvSampleTimeNow( BaseType_t * const pxTimerListsWereSwitched )
\r
695 TickType_t xTimeNow;
\r
696 PRIVILEGED_DATA static TickType_t xLastTime = ( TickType_t ) 0U; /*lint !e956 Variable is only accessible to one task. */
\r
698 xTimeNow = xTaskGetTickCount();
\r
700 if( xTimeNow < xLastTime )
\r
702 prvSwitchTimerLists();
\r
703 *pxTimerListsWereSwitched = pdTRUE;
\r
707 *pxTimerListsWereSwitched = pdFALSE;
\r
710 xLastTime = xTimeNow;
\r
714 /*-----------------------------------------------------------*/
\r
716 static BaseType_t prvInsertTimerInActiveList( Timer_t * const pxTimer,
\r
717 const TickType_t xNextExpiryTime,
\r
718 const TickType_t xTimeNow,
\r
719 const TickType_t xCommandTime )
\r
721 BaseType_t xProcessTimerNow = pdFALSE;
\r
723 listSET_LIST_ITEM_VALUE( &( pxTimer->xTimerListItem ), xNextExpiryTime );
\r
724 listSET_LIST_ITEM_OWNER( &( pxTimer->xTimerListItem ), pxTimer );
\r
726 if( xNextExpiryTime <= xTimeNow )
\r
728 /* Has the expiry time elapsed between the command to start/reset a
\r
729 * timer was issued, and the time the command was processed? */
\r
730 if( ( ( TickType_t ) ( xTimeNow - xCommandTime ) ) >= pxTimer->xTimerPeriodInTicks ) /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
\r
732 /* The time between a command being issued and the command being
\r
733 * processed actually exceeds the timers period. */
\r
734 xProcessTimerNow = pdTRUE;
\r
738 vListInsert( pxOverflowTimerList, &( pxTimer->xTimerListItem ) );
\r
743 if( ( xTimeNow < xCommandTime ) && ( xNextExpiryTime >= xCommandTime ) )
\r
745 /* If, since the command was issued, the tick count has overflowed
\r
746 * but the expiry time has not, then the timer must have already passed
\r
747 * its expiry time and should be processed immediately. */
\r
748 xProcessTimerNow = pdTRUE;
\r
752 vListInsert( pxCurrentTimerList, &( pxTimer->xTimerListItem ) );
\r
756 return xProcessTimerNow;
\r
758 /*-----------------------------------------------------------*/
\r
760 static void prvProcessReceivedCommands( void )
\r
762 DaemonTaskMessage_t xMessage;
\r
764 BaseType_t xTimerListsWereSwitched;
\r
765 TickType_t xTimeNow;
\r
767 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. */
\r
769 #if ( INCLUDE_xTimerPendFunctionCall == 1 )
\r
771 /* Negative commands are pended function calls rather than timer
\r
773 if( xMessage.xMessageID < ( BaseType_t ) 0 )
\r
775 const CallbackParameters_t * const pxCallback = &( xMessage.u.xCallbackParameters );
\r
777 /* The timer uses the xCallbackParameters member to request a
\r
778 * callback be executed. Check the callback is not NULL. */
\r
779 configASSERT( pxCallback );
\r
781 /* Call the function. */
\r
782 pxCallback->pxCallbackFunction( pxCallback->pvParameter1, pxCallback->ulParameter2 );
\r
786 mtCOVERAGE_TEST_MARKER();
\r
789 #endif /* INCLUDE_xTimerPendFunctionCall */
\r
791 /* Commands that are positive are timer commands rather than pended
\r
792 * function calls. */
\r
793 if( xMessage.xMessageID >= ( BaseType_t ) 0 )
\r
795 /* The messages uses the xTimerParameters member to work on a
\r
796 * software timer. */
\r
797 pxTimer = xMessage.u.xTimerParameters.pxTimer;
\r
799 if( listIS_CONTAINED_WITHIN( NULL, &( pxTimer->xTimerListItem ) ) == pdFALSE ) /*lint !e961. The cast is only redundant when NULL is passed into the macro. */
\r
801 /* The timer is in a list, remove it. */
\r
802 ( void ) uxListRemove( &( pxTimer->xTimerListItem ) );
\r
806 mtCOVERAGE_TEST_MARKER();
\r
809 traceTIMER_COMMAND_RECEIVED( pxTimer, xMessage.xMessageID, xMessage.u.xTimerParameters.xMessageValue );
\r
811 /* In this case the xTimerListsWereSwitched parameter is not used, but
\r
812 * it must be present in the function call. prvSampleTimeNow() must be
\r
813 * called after the message is received from xTimerQueue so there is no
\r
814 * possibility of a higher priority task adding a message to the message
\r
815 * queue with a time that is ahead of the timer daemon task (because it
\r
816 * pre-empted the timer daemon task after the xTimeNow value was set). */
\r
817 xTimeNow = prvSampleTimeNow( &xTimerListsWereSwitched );
\r
819 switch( xMessage.xMessageID )
\r
821 case tmrCOMMAND_START:
\r
822 case tmrCOMMAND_START_FROM_ISR:
\r
823 case tmrCOMMAND_RESET:
\r
824 case tmrCOMMAND_RESET_FROM_ISR:
\r
825 /* Start or restart a timer. */
\r
826 pxTimer->ucStatus |= tmrSTATUS_IS_ACTIVE;
\r
828 if( prvInsertTimerInActiveList( pxTimer, xMessage.u.xTimerParameters.xMessageValue + pxTimer->xTimerPeriodInTicks, xTimeNow, xMessage.u.xTimerParameters.xMessageValue ) != pdFALSE )
\r
830 /* The timer expired before it was added to the active
\r
831 * timer list. Process it now. */
\r
832 if( ( pxTimer->ucStatus & tmrSTATUS_IS_AUTORELOAD ) != 0 )
\r
834 prvReloadTimer( pxTimer, xMessage.u.xTimerParameters.xMessageValue + pxTimer->xTimerPeriodInTicks, xTimeNow );
\r
838 pxTimer->ucStatus &= ( ( uint8_t ) ~tmrSTATUS_IS_ACTIVE );
\r
841 /* Call the timer callback. */
\r
842 traceTIMER_EXPIRED( pxTimer );
\r
843 pxTimer->pxCallbackFunction( ( TimerHandle_t ) pxTimer );
\r
847 mtCOVERAGE_TEST_MARKER();
\r
852 case tmrCOMMAND_STOP:
\r
853 case tmrCOMMAND_STOP_FROM_ISR:
\r
854 /* The timer has already been removed from the active list. */
\r
855 pxTimer->ucStatus &= ( ( uint8_t ) ~tmrSTATUS_IS_ACTIVE );
\r
858 case tmrCOMMAND_CHANGE_PERIOD:
\r
859 case tmrCOMMAND_CHANGE_PERIOD_FROM_ISR:
\r
860 pxTimer->ucStatus |= tmrSTATUS_IS_ACTIVE;
\r
861 pxTimer->xTimerPeriodInTicks = xMessage.u.xTimerParameters.xMessageValue;
\r
862 configASSERT( ( pxTimer->xTimerPeriodInTicks > 0 ) );
\r
864 /* The new period does not really have a reference, and can
\r
865 * be longer or shorter than the old one. The command time is
\r
866 * therefore set to the current time, and as the period cannot
\r
867 * be zero the next expiry time can only be in the future,
\r
868 * meaning (unlike for the xTimerStart() case above) there is
\r
869 * no fail case that needs to be handled here. */
\r
870 ( void ) prvInsertTimerInActiveList( pxTimer, ( xTimeNow + pxTimer->xTimerPeriodInTicks ), xTimeNow, xTimeNow );
\r
873 case tmrCOMMAND_DELETE:
\r
874 #if ( configSUPPORT_DYNAMIC_ALLOCATION == 1 )
\r
876 /* The timer has already been removed from the active list,
\r
877 * just free up the memory if the memory was dynamically
\r
879 if( ( pxTimer->ucStatus & tmrSTATUS_IS_STATICALLY_ALLOCATED ) == ( uint8_t ) 0 )
\r
881 vPortFree( pxTimer );
\r
885 pxTimer->ucStatus &= ( ( uint8_t ) ~tmrSTATUS_IS_ACTIVE );
\r
888 #else /* if ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) */
\r
890 /* If dynamic allocation is not enabled, the memory
\r
891 * could not have been dynamically allocated. So there is
\r
892 * no need to free the memory - just mark the timer as
\r
894 pxTimer->ucStatus &= ( ( uint8_t ) ~tmrSTATUS_IS_ACTIVE );
\r
896 #endif /* configSUPPORT_DYNAMIC_ALLOCATION */
\r
900 /* Don't expect to get here. */
\r
906 /*-----------------------------------------------------------*/
\r
908 static void prvSwitchTimerLists( void )
\r
910 TickType_t xNextExpireTime;
\r
913 /* The tick count has overflowed. The timer lists must be switched.
\r
914 * If there are any timers still referenced from the current timer list
\r
915 * then they must have expired and should be processed before the lists
\r
917 while( listLIST_IS_EMPTY( pxCurrentTimerList ) == pdFALSE )
\r
919 xNextExpireTime = listGET_ITEM_VALUE_OF_HEAD_ENTRY( pxCurrentTimerList );
\r
921 /* Process the expired timer. For auto-reload timers, be careful to
\r
922 * process only expirations that occur on the current list. Further
\r
923 * expirations must wait until after the lists are switched. */
\r
924 prvProcessExpiredTimer( xNextExpireTime, tmrMAX_TIME_BEFORE_OVERFLOW );
\r
927 pxTemp = pxCurrentTimerList;
\r
928 pxCurrentTimerList = pxOverflowTimerList;
\r
929 pxOverflowTimerList = pxTemp;
\r
931 /*-----------------------------------------------------------*/
\r
933 static void prvCheckForValidListAndQueue( void )
\r
935 /* Check that the list from which active timers are referenced, and the
\r
936 * queue used to communicate with the timer service, have been
\r
938 taskENTER_CRITICAL();
\r
940 if( xTimerQueue == NULL )
\r
942 vListInitialise( &xActiveTimerList1 );
\r
943 vListInitialise( &xActiveTimerList2 );
\r
944 pxCurrentTimerList = &xActiveTimerList1;
\r
945 pxOverflowTimerList = &xActiveTimerList2;
\r
947 #if ( configSUPPORT_STATIC_ALLOCATION == 1 )
\r
949 /* The timer queue is allocated statically in case
\r
950 * configSUPPORT_DYNAMIC_ALLOCATION is 0. */
\r
951 PRIVILEGED_DATA static StaticQueue_t xStaticTimerQueue; /*lint !e956 Ok to declare in this manner to prevent additional conditional compilation guards in other locations. */
\r
952 PRIVILEGED_DATA static uint8_t ucStaticTimerQueueStorage[ ( size_t ) configTIMER_QUEUE_LENGTH * sizeof( DaemonTaskMessage_t ) ]; /*lint !e956 Ok to declare in this manner to prevent additional conditional compilation guards in other locations. */
\r
954 xTimerQueue = xQueueCreateStatic( ( UBaseType_t ) configTIMER_QUEUE_LENGTH, ( UBaseType_t ) sizeof( DaemonTaskMessage_t ), &( ucStaticTimerQueueStorage[ 0 ] ), &xStaticTimerQueue );
\r
958 xTimerQueue = xQueueCreate( ( UBaseType_t ) configTIMER_QUEUE_LENGTH, sizeof( DaemonTaskMessage_t ) );
\r
960 #endif /* if ( configSUPPORT_STATIC_ALLOCATION == 1 ) */
\r
962 #if ( configQUEUE_REGISTRY_SIZE > 0 )
\r
964 if( xTimerQueue != NULL )
\r
966 vQueueAddToRegistry( xTimerQueue, "TmrQ" );
\r
970 mtCOVERAGE_TEST_MARKER();
\r
973 #endif /* configQUEUE_REGISTRY_SIZE */
\r
977 mtCOVERAGE_TEST_MARKER();
\r
980 taskEXIT_CRITICAL();
\r
982 /*-----------------------------------------------------------*/
\r
984 BaseType_t xTimerIsTimerActive( TimerHandle_t xTimer )
\r
986 BaseType_t xReturn;
\r
987 Timer_t * pxTimer = xTimer;
\r
989 configASSERT( xTimer );
\r
991 /* Is the timer in the list of active timers? */
\r
992 taskENTER_CRITICAL();
\r
994 if( ( pxTimer->ucStatus & tmrSTATUS_IS_ACTIVE ) == 0 )
\r
1003 taskEXIT_CRITICAL();
\r
1006 } /*lint !e818 Can't be pointer to const due to the typedef. */
\r
1007 /*-----------------------------------------------------------*/
\r
1009 void * pvTimerGetTimerID( const TimerHandle_t xTimer )
\r
1011 Timer_t * const pxTimer = xTimer;
\r
1014 configASSERT( xTimer );
\r
1016 taskENTER_CRITICAL();
\r
1018 pvReturn = pxTimer->pvTimerID;
\r
1020 taskEXIT_CRITICAL();
\r
1024 /*-----------------------------------------------------------*/
\r
1026 void vTimerSetTimerID( TimerHandle_t xTimer,
\r
1029 Timer_t * const pxTimer = xTimer;
\r
1031 configASSERT( xTimer );
\r
1033 taskENTER_CRITICAL();
\r
1035 pxTimer->pvTimerID = pvNewID;
\r
1037 taskEXIT_CRITICAL();
\r
1039 /*-----------------------------------------------------------*/
\r
1041 #if ( INCLUDE_xTimerPendFunctionCall == 1 )
\r
1043 BaseType_t xTimerPendFunctionCallFromISR( PendedFunction_t xFunctionToPend,
\r
1044 void * pvParameter1,
\r
1045 uint32_t ulParameter2,
\r
1046 BaseType_t * pxHigherPriorityTaskWoken )
\r
1048 DaemonTaskMessage_t xMessage;
\r
1049 BaseType_t xReturn;
\r
1051 /* Complete the message with the function parameters and post it to the
\r
1053 xMessage.xMessageID = tmrCOMMAND_EXECUTE_CALLBACK_FROM_ISR;
\r
1054 xMessage.u.xCallbackParameters.pxCallbackFunction = xFunctionToPend;
\r
1055 xMessage.u.xCallbackParameters.pvParameter1 = pvParameter1;
\r
1056 xMessage.u.xCallbackParameters.ulParameter2 = ulParameter2;
\r
1058 xReturn = xQueueSendFromISR( xTimerQueue, &xMessage, pxHigherPriorityTaskWoken );
\r
1060 tracePEND_FUNC_CALL_FROM_ISR( xFunctionToPend, pvParameter1, ulParameter2, xReturn );
\r
1065 #endif /* INCLUDE_xTimerPendFunctionCall */
\r
1066 /*-----------------------------------------------------------*/
\r
1068 #if ( INCLUDE_xTimerPendFunctionCall == 1 )
\r
1070 BaseType_t xTimerPendFunctionCall( PendedFunction_t xFunctionToPend,
\r
1071 void * pvParameter1,
\r
1072 uint32_t ulParameter2,
\r
1073 TickType_t xTicksToWait )
\r
1075 DaemonTaskMessage_t xMessage;
\r
1076 BaseType_t xReturn;
\r
1078 /* This function can only be called after a timer has been created or
\r
1079 * after the scheduler has been started because, until then, the timer
\r
1080 * queue does not exist. */
\r
1081 configASSERT( xTimerQueue );
\r
1083 /* Complete the message with the function parameters and post it to the
\r
1085 xMessage.xMessageID = tmrCOMMAND_EXECUTE_CALLBACK;
\r
1086 xMessage.u.xCallbackParameters.pxCallbackFunction = xFunctionToPend;
\r
1087 xMessage.u.xCallbackParameters.pvParameter1 = pvParameter1;
\r
1088 xMessage.u.xCallbackParameters.ulParameter2 = ulParameter2;
\r
1090 xReturn = xQueueSendToBack( xTimerQueue, &xMessage, xTicksToWait );
\r
1092 tracePEND_FUNC_CALL( xFunctionToPend, pvParameter1, ulParameter2, xReturn );
\r
1097 #endif /* INCLUDE_xTimerPendFunctionCall */
\r
1098 /*-----------------------------------------------------------*/
\r
1100 #if ( configUSE_TRACE_FACILITY == 1 )
\r
1102 UBaseType_t uxTimerGetTimerNumber( TimerHandle_t xTimer )
\r
1104 return ( ( Timer_t * ) xTimer )->uxTimerNumber;
\r
1107 #endif /* configUSE_TRACE_FACILITY */
\r
1108 /*-----------------------------------------------------------*/
\r
1110 #if ( configUSE_TRACE_FACILITY == 1 )
\r
1112 void vTimerSetTimerNumber( TimerHandle_t xTimer,
\r
1113 UBaseType_t uxTimerNumber )
\r
1115 ( ( Timer_t * ) xTimer )->uxTimerNumber = uxTimerNumber;
\r
1118 #endif /* configUSE_TRACE_FACILITY */
\r
1119 /*-----------------------------------------------------------*/
\r
1121 /* This entire source file will be skipped if the application is not configured
\r
1122 * to include software timer functionality. If you want to include software timer
\r
1123 * functionality then ensure configUSE_TIMERS is set to 1 in FreeRTOSConfig.h. */
\r
1124 #endif /* configUSE_TIMERS == 1 */
\r