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<div class="title">xTaskCreateRestricted</div> </div>
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<p>task. h </p><pre>
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BaseType_t xTaskCreateRestricted( TaskParameters_t *pxTaskDefinition, TaskHandle_t *pxCreatedTask );</pre><p>Only available when configSUPPORT_DYNAMIC_ALLOCATION is set to 1.</p>
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<p>xTaskCreateRestricted() should only be used in systems that include an MPU implementation.</p>
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<p>Create a new task and add it to the list of tasks that are ready to run. The function parameters define the memory regions and associated access permissions allocated to the task.</p>
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<p>See xTaskCreateRestrictedStatic() for a version that does not use any dynamic memory allocation.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">pxTaskDefinition</td><td>Pointer to a structure that contains a member for each of the normal xTaskCreate() parameters (see the xTaskCreate() API documentation) plus an optional stack buffer and the memory region definitions.</td></tr>
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<tr><td class="paramname">pxCreatedTask</td><td>Used to pass back a handle by which the created task can be referenced.</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>pdPASS if the task was successfully created and added to a ready list, otherwise an error code defined in the file <a class="el" href="projdefs_8h.html">projdefs.h</a></dd></dl>
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<p>Example usage: </p><pre>
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// Create an TaskParameters_t structure that defines the task to be created.
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static const TaskParameters_t xCheckTaskParameters =
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{
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vATask, // pvTaskCode - the function that implements the task.
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"ATask", // pcName - just a text name for the task to assist debugging.
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100, // usStackDepth - the stack size DEFINED IN WORDS.
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NULL, // pvParameters - passed into the task function as the function parameters.
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( 1UL | portPRIVILEGE_BIT ),// uxPriority - task priority, set the portPRIVILEGE_BIT if the task should run in a privileged state.
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cStackBuffer,// puxStackBuffer - the buffer to be used as the task stack.</pre><pre> // xRegions - Allocate up to three separate memory regions for access by
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// the task, with appropriate access permissions. Different processors have
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// different memory alignment requirements - refer to the FreeRTOS documentation
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// for full information.
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{
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// Base address Length Parameters
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{ cReadWriteArray, 32, portMPU_REGION_READ_WRITE },
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{ cReadOnlyArray, 32, portMPU_REGION_READ_ONLY },
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{ cPrivilegedOnlyAccessArray, 128, portMPU_REGION_PRIVILEGED_READ_WRITE }
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}
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};</pre><pre>int <a class="el" href="_main_8c.html#a840291bc02cba5474a4cb46a9b9566fe" title="app entry point">main( void )</a>
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{
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TaskHandle_t xHandle;</pre><pre> // Create a task from the const structure defined above. The task handle
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// is requested (the second parameter is not NULL) but in this case just for
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// demonstration purposes as its not actually used.
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xTaskCreateRestricted( &xRegTest1Parameters, &xHandle );</pre><pre> // Start the scheduler.
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<a class="el" href="task_8h.html#aaf9dca1065c60abdeb309d56ab7293cb">vTaskStartScheduler()</a>;</pre><pre> // Will only get here if there was insufficient memory to create the idle
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// and/or timer task.
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for( ;; );
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}
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</pre><p>task. h </p><pre>
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void <a class="el" href="task_8h.html#ad889595baff9faf9efe02f3696825409">vTaskAllocateMPURegions( TaskHandle_t xTask, const MemoryRegion_t * const pxRegions )</a>;</pre><p>Memory regions are assigned to a restricted task when the task is created by a call to xTaskCreateRestricted(). These regions can be redefined using <a class="el" href="task_8h.html#ad889595baff9faf9efe02f3696825409">vTaskAllocateMPURegions()</a>.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">xTask</td><td>The handle of the task being updated.</td></tr>
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<tr><td class="paramname">xRegions</td><td>A pointer to an MemoryRegion_t structure that contains the new memory region definitions.</td></tr>
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</table>
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</dd>
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</dl>
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<p>Example usage: </p><pre>
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// Define an array of MemoryRegion_t structures that configures an MPU region
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// allowing read/write access for 1024 bytes starting at the beginning of the
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// ucOneKByte array. The other two of the maximum 3 definable regions are
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// unused so set to zero.
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static const MemoryRegion_t xAltRegions[ portNUM_CONFIGURABLE_REGIONS ] =
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{
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// Base address Length Parameters
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{ ucOneKByte, 1024, portMPU_REGION_READ_WRITE },
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{ 0, 0, 0 },
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{ 0, 0, 0 }
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};</pre><pre>void vATask( void *pvParameters )
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{
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// This task was created such that it has access to certain regions of
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// memory as defined by the MPU configuration. At some point it is
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// desired that these MPU regions are replaced with that defined in the
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// xAltRegions const struct above. Use a call to <a class="el" href="task_8h.html#ad889595baff9faf9efe02f3696825409">vTaskAllocateMPURegions()</a>
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// for this purpose. NULL is used as the task handle to indicate that this
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// function should modify the MPU regions of the calling task.
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vTaskAllocateMPURegions( NULL, xAltRegions );</pre><pre> // Now the task can continue its function, but from this point on can only
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// access its stack and the ucOneKByte array (unless any other statically
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// defined or shared regions have been declared elsewhere).
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}
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