xTaskCreateRestricted

Collaboration diagram for xTaskCreateRestricted:

task. h

BaseType_t xTaskCreateRestricted( TaskParameters_t *pxTaskDefinition, TaskHandle_t *pxCreatedTask );

Only available when configSUPPORT_DYNAMIC_ALLOCATION is set to 1.

xTaskCreateRestricted() should only be used in systems that include an MPU implementation.

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.

See xTaskCreateRestrictedStatic() for a version that does not use any dynamic memory allocation.

Parameters

pxTaskDefinition	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.
pxCreatedTask	Used to pass back a handle by which the created task can be referenced.

Returns

pdPASS if the task was successfully created and added to a ready list, otherwise an error code defined in the file projdefs.h

Example usage:

// Create an TaskParameters_t structure that defines the task to be created.
static const TaskParameters_t xCheckTaskParameters =
{
 vATask,     // pvTaskCode - the function that implements the task.
 "ATask",    // pcName - just a text name for the task to assist debugging.
 100,        // uxStackDepth - the stack size DEFINED IN WORDS.
 NULL,       // pvParameters - passed into the task function as the function parameters.
 ( 1U | portPRIVILEGE_BIT ),// uxPriority - task priority, set the portPRIVILEGE_BIT if the task should run in a privileged state.
 cStackBuffer,// puxStackBuffer - the buffer to be used as the task stack.
 
 // xRegions - Allocate up to three separate memory regions for access by
 // the task, with appropriate access permissions.  Different processors have
 // different memory alignment requirements - refer to the FreeRTOS documentation
 // for full information.
 {
     // Base address                 Length  Parameters
     { cReadWriteArray,              32,     portMPU_REGION_READ_WRITE },
     { cReadOnlyArray,               32,     portMPU_REGION_READ_ONLY },
     { cPrivilegedOnlyAccessArray,   128,    portMPU_REGION_PRIVILEGED_READ_WRITE }
 }
};
 
int main( void )
{
TaskHandle_t xHandle;
 
 // Create a task from the const structure defined above.  The task handle
 // is requested (the second parameter is not NULL) but in this case just for
 // demonstration purposes as its not actually used.
 xTaskCreateRestricted( &xRegTest1Parameters, &xHandle );
 
 // Start the scheduler.
 vTaskStartScheduler();
 
 // Will only get here if there was insufficient memory to create the idle
 // and/or timer task.
 for( ;; );
}