Rohit Grover
www.freertos.org
Dependents: Nucleo freertos_test FreeRTOS_test freertos_bluetooth ... more
Diff: Source/tasks.c
- Revision:
- 0:8e57f3e9cc89
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/Source/tasks.c Fri Jan 24 14:56:04 2014 +0000
@@ -0,0 +1,2978 @@
+/*
+ FreeRTOS V7.6.0 - Copyright (C) 2013 Real Time Engineers Ltd.
+ All rights reserved
+
+ VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
+
+ ***************************************************************************
+ * *
+ * FreeRTOS provides completely free yet professionally developed, *
+ * robust, strictly quality controlled, supported, and cross *
+ * platform software that has become a de facto standard. *
+ * *
+ * Help yourself get started quickly and support the FreeRTOS *
+ * project by purchasing a FreeRTOS tutorial book, reference *
+ * manual, or both from: http://www.FreeRTOS.org/Documentation *
+ * *
+ * Thank you! *
+ * *
+ ***************************************************************************
+
+ This file is part of the FreeRTOS distribution.
+
+ FreeRTOS is free software; you can redistribute it and/or modify it under
+ the terms of the GNU General Public License (version 2) as published by the
+ Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
+
+ >>! NOTE: The modification to the GPL is included to allow you to distribute
+ >>! a combined work that includes FreeRTOS without being obliged to provide
+ >>! the source code for proprietary components outside of the FreeRTOS
+ >>! kernel.
+
+ FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ FOR A PARTICULAR PURPOSE. Full license text is available from the following
+ link: http://www.freertos.org/a00114.html
+
+ 1 tab == 4 spaces!
+
+ ***************************************************************************
+ * *
+ * Having a problem? Start by reading the FAQ "My application does *
+ * not run, what could be wrong?" *
+ * *
+ * http://www.FreeRTOS.org/FAQHelp.html *
+ * *
+ ***************************************************************************
+
+ http://www.FreeRTOS.org - Documentation, books, training, latest versions,
+ license and Real Time Engineers Ltd. contact details.
+
+ http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
+ including FreeRTOS+Trace - an indispensable productivity tool, a DOS
+ compatible FAT file system, and our tiny thread aware UDP/IP stack.
+
+ http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
+ Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
+ licenses offer ticketed support, indemnification and middleware.
+
+ http://www.SafeRTOS.com - High Integrity Systems also provide a safety
+ engineered and independently SIL3 certified version for use in safety and
+ mission critical applications that require provable dependability.
+
+ 1 tab == 4 spaces!
+*/
+
+/* Standard includes. */
+#include <stdlib.h>
+#include <string.h>
+
+/* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
+all the API functions to use the MPU wrappers. That should only be done when
+task.h is included from an application file. */
+#define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
+
+/* FreeRTOS includes. */
+#include "FreeRTOS.h"
+#include "task.h"
+#include "timers.h"
+#include "StackMacros.h"
+
+/* Lint e961 and e750 are suppressed as a MISRA exception justified because the
+MPU ports require MPU_WRAPPERS_INCLUDED_FROM_API_FILE to be defined for the
+header files above, but not in this file, in order to generate the correct
+privileged Vs unprivileged linkage and placement. */
+#undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE /*lint !e961 !e750. */
+
+#if ( configUSE_STATS_FORMATTING_FUNCTIONS == 1 )
+ /* At the bottom of this file are two optional functions that can be used
+ to generate human readable text from the raw data generated by the
+ uxTaskGetSystemState() function. Note the formatting functions are provided
+ for convenience only, and are NOT considered part of the kernel. */
+ #include <stdio.h>
+#endif /* configUSE_STATS_FORMATTING_FUNCTIONS == 1 ) */
+
+/* Sanity check the configuration. */
+#if configUSE_TICKLESS_IDLE != 0
+ #if INCLUDE_vTaskSuspend != 1
+ #error INCLUDE_vTaskSuspend must be set to 1 if configUSE_TICKLESS_IDLE is not set to 0
+ #endif /* INCLUDE_vTaskSuspend */
+#endif /* configUSE_TICKLESS_IDLE */
+
+/*
+ * Defines the size, in words, of the stack allocated to the idle task.
+ */
+#define tskIDLE_STACK_SIZE configMINIMAL_STACK_SIZE
+
+#if( configUSE_PREEMPTION == 0 )
+ /* If the cooperative scheduler is being used then a yield should not be
+ performed just because a higher priority task has been woken. */
+ #define taskYIELD_IF_USING_PREEMPTION()
+#else
+ #define taskYIELD_IF_USING_PREEMPTION() portYIELD_WITHIN_API()
+#endif
+
+/*
+ * Task control block. A task control block (TCB) is allocated for each task,
+ * and stores task state information, including a pointer to the task's context
+ * (the task's run time environment, including register values)
+ */
+typedef struct tskTaskControlBlock
+{
+ volatile portSTACK_TYPE *pxTopOfStack; /*< Points to the location of the last item placed on the tasks stack. THIS MUST BE THE FIRST MEMBER OF THE TCB STRUCT. */
+
+ #if ( portUSING_MPU_WRAPPERS == 1 )
+ xMPU_SETTINGS xMPUSettings; /*< The MPU settings are defined as part of the port layer. THIS MUST BE THE SECOND MEMBER OF THE TCB STRUCT. */
+ #endif
+
+ xListItem xGenericListItem; /*< The list that the state list item of a task is reference from denotes the state of that task (Ready, Blocked, Suspended ). */
+ xListItem xEventListItem; /*< Used to reference a task from an event list. */
+ unsigned portBASE_TYPE uxPriority; /*< The priority of the task. 0 is the lowest priority. */
+ portSTACK_TYPE *pxStack; /*< Points to the start of the stack. */
+ signed char pcTaskName[ configMAX_TASK_NAME_LEN ];/*< Descriptive name given to the task when created. Facilitates debugging only. */
+
+ #if ( portSTACK_GROWTH > 0 )
+ portSTACK_TYPE *pxEndOfStack; /*< Points to the end of the stack on architectures where the stack grows up from low memory. */
+ #endif
+
+ #if ( portCRITICAL_NESTING_IN_TCB == 1 )
+ unsigned portBASE_TYPE uxCriticalNesting; /*< Holds the critical section nesting depth for ports that do not maintain their own count in the port layer. */
+ #endif
+
+ #if ( configUSE_TRACE_FACILITY == 1 )
+ unsigned portBASE_TYPE uxTCBNumber; /*< Stores a number that increments each time a TCB is created. It allows debuggers to determine when a task has been deleted and then recreated. */
+ unsigned portBASE_TYPE uxTaskNumber; /*< Stores a number specifically for use by third party trace code. */
+ #endif
+
+ #if ( configUSE_MUTEXES == 1 )
+ unsigned portBASE_TYPE uxBasePriority; /*< The priority last assigned to the task - used by the priority inheritance mechanism. */
+ #endif
+
+ #if ( configUSE_APPLICATION_TASK_TAG == 1 )
+ pdTASK_HOOK_CODE pxTaskTag;
+ #endif
+
+ #if ( configGENERATE_RUN_TIME_STATS == 1 )
+ unsigned long ulRunTimeCounter; /*< Stores the amount of time the task has spent in the Running state. */
+ #endif
+
+ #if ( configUSE_NEWLIB_REENTRANT == 1 )
+ /* Allocate a Newlib reent structure that is specific to this task.
+ Note Newlib support has been included by popular demand, but is not
+ used by the FreeRTOS maintainers themselves. FreeRTOS is not
+ responsible for resulting newlib operation. User must be familiar with
+ newlib and must provide system-wide implementations of the necessary
+ stubs. Be warned that (at the time of writing) the current newlib design
+ implements a system-wide malloc() that must be provided with locks. */
+ struct _reent xNewLib_reent;
+ #endif
+
+} tskTCB;
+
+
+/*
+ * Some kernel aware debuggers require the data the debugger needs access to to
+ * be global, rather than file scope.
+ */
+#ifdef portREMOVE_STATIC_QUALIFIER
+ #define static
+#endif
+
+/*lint -e956 A manual analysis and inspection has been used to determine which
+static variables must be declared volatile. */
+
+PRIVILEGED_DATA tskTCB * volatile pxCurrentTCB = NULL;
+
+/* Lists for ready and blocked tasks. --------------------*/
+PRIVILEGED_DATA static xList pxReadyTasksLists[ configMAX_PRIORITIES ]; /*< Prioritised ready tasks. */
+PRIVILEGED_DATA static xList xDelayedTaskList1; /*< Delayed tasks. */
+PRIVILEGED_DATA static xList xDelayedTaskList2; /*< Delayed tasks (two lists are used - one for delays that have overflowed the current tick count. */
+PRIVILEGED_DATA static xList * volatile pxDelayedTaskList; /*< Points to the delayed task list currently being used. */
+PRIVILEGED_DATA static xList * volatile pxOverflowDelayedTaskList; /*< Points to the delayed task list currently being used to hold tasks that have overflowed the current tick count. */
+PRIVILEGED_DATA static xList xPendingReadyList; /*< Tasks that have been readied while the scheduler was suspended. They will be moved to the ready list when the scheduler is resumed. */
+
+#if ( INCLUDE_vTaskDelete == 1 )
+
+ PRIVILEGED_DATA static xList xTasksWaitingTermination; /*< Tasks that have been deleted - but the their memory not yet freed. */
+ PRIVILEGED_DATA static volatile unsigned portBASE_TYPE uxTasksDeleted = ( unsigned portBASE_TYPE ) 0U;
+
+#endif
+
+#if ( INCLUDE_vTaskSuspend == 1 )
+
+ PRIVILEGED_DATA static xList xSuspendedTaskList; /*< Tasks that are currently suspended. */
+
+#endif
+
+#if ( INCLUDE_xTaskGetIdleTaskHandle == 1 )
+
+ PRIVILEGED_DATA static xTaskHandle xIdleTaskHandle = NULL; /*< Holds the handle of the idle task. The idle task is created automatically when the scheduler is started. */
+
+#endif
+
+/* Other file private variables. --------------------------------*/
+PRIVILEGED_DATA static volatile unsigned portBASE_TYPE uxCurrentNumberOfTasks = ( unsigned portBASE_TYPE ) 0U;
+PRIVILEGED_DATA static volatile portTickType xTickCount = ( portTickType ) 0U;
+PRIVILEGED_DATA static volatile unsigned portBASE_TYPE uxTopReadyPriority = tskIDLE_PRIORITY;
+PRIVILEGED_DATA static volatile signed portBASE_TYPE xSchedulerRunning = pdFALSE;
+PRIVILEGED_DATA static volatile unsigned portBASE_TYPE uxSchedulerSuspended = ( unsigned portBASE_TYPE ) pdFALSE;
+PRIVILEGED_DATA static volatile unsigned portBASE_TYPE uxPendedTicks = ( unsigned portBASE_TYPE ) 0U;
+PRIVILEGED_DATA static volatile portBASE_TYPE xYieldPending = pdFALSE;
+PRIVILEGED_DATA static volatile portBASE_TYPE xNumOfOverflows = ( portBASE_TYPE ) 0;
+PRIVILEGED_DATA static unsigned portBASE_TYPE uxTaskNumber = ( unsigned portBASE_TYPE ) 0U;
+PRIVILEGED_DATA static volatile portTickType xNextTaskUnblockTime = portMAX_DELAY;
+
+#if ( configGENERATE_RUN_TIME_STATS == 1 )
+
+ PRIVILEGED_DATA static unsigned long ulTaskSwitchedInTime = 0UL; /*< Holds the value of a timer/counter the last time a task was switched in. */
+ PRIVILEGED_DATA static unsigned long ulTotalRunTime = 0UL; /*< Holds the total amount of execution time as defined by the run time counter clock. */
+
+#endif
+
+/*lint +e956 */
+
+/* Debugging and trace facilities private variables and macros. ------------*/
+
+/*
+ * The value used to fill the stack of a task when the task is created. This
+ * is used purely for checking the high water mark for tasks.
+ */
+#define tskSTACK_FILL_BYTE ( 0xa5U )
+
+/*
+ * Macros used by vListTask to indicate which state a task is in.
+ */
+#define tskBLOCKED_CHAR ( ( signed char ) 'B' )
+#define tskREADY_CHAR ( ( signed char ) 'R' )
+#define tskDELETED_CHAR ( ( signed char ) 'D' )
+#define tskSUSPENDED_CHAR ( ( signed char ) 'S' )
+
+/*-----------------------------------------------------------*/
+
+#if ( configUSE_PORT_OPTIMISED_TASK_SELECTION == 0 )
+
+ /* If configUSE_PORT_OPTIMISED_TASK_SELECTION is 0 then task selection is
+ performed in a generic way that is not optimised to any particular
+ microcontroller architecture. */
+
+ /* uxTopReadyPriority holds the priority of the highest priority ready
+ state task. */
+ #define taskRECORD_READY_PRIORITY( uxPriority ) \
+ { \
+ if( ( uxPriority ) > uxTopReadyPriority ) \
+ { \
+ uxTopReadyPriority = ( uxPriority ); \
+ } \
+ } /* taskRECORD_READY_PRIORITY */
+
+ /*-----------------------------------------------------------*/
+
+ #define taskSELECT_HIGHEST_PRIORITY_TASK() \
+ { \
+ /* Find the highest priority queue that contains ready tasks. */ \
+ while( listLIST_IS_EMPTY( &( pxReadyTasksLists[ uxTopReadyPriority ] ) ) ) \
+ { \
+ configASSERT( uxTopReadyPriority ); \
+ --uxTopReadyPriority; \
+ } \
+ \
+ /* listGET_OWNER_OF_NEXT_ENTRY indexes through the list, so the tasks of \
+ the same priority get an equal share of the processor time. */ \
+ listGET_OWNER_OF_NEXT_ENTRY( pxCurrentTCB, &( pxReadyTasksLists[ uxTopReadyPriority ] ) ); \
+ } /* taskSELECT_HIGHEST_PRIORITY_TASK */
+
+ /*-----------------------------------------------------------*/
+
+ /* Define away taskRESET_READY_PRIORITY() and portRESET_READY_PRIORITY() as
+ they are only required when a port optimised method of task selection is
+ being used. */
+ #define taskRESET_READY_PRIORITY( uxPriority )
+ #define portRESET_READY_PRIORITY( uxPriority, uxTopReadyPriority )
+
+#else /* configUSE_PORT_OPTIMISED_TASK_SELECTION */
+
+ /* If configUSE_PORT_OPTIMISED_TASK_SELECTION is 1 then task selection is
+ performed in a way that is tailored to the particular microcontroller
+ architecture being used. */
+
+ /* A port optimised version is provided. Call the port defined macros. */
+ #define taskRECORD_READY_PRIORITY( uxPriority ) portRECORD_READY_PRIORITY( uxPriority, uxTopReadyPriority )
+
+ /*-----------------------------------------------------------*/
+
+ #define taskSELECT_HIGHEST_PRIORITY_TASK() \
+ { \
+ unsigned portBASE_TYPE uxTopPriority; \
+ \
+ /* Find the highest priority queue that contains ready tasks. */ \
+ portGET_HIGHEST_PRIORITY( uxTopPriority, uxTopReadyPriority ); \
+ configASSERT( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ uxTopPriority ] ) ) > 0 ); \
+ listGET_OWNER_OF_NEXT_ENTRY( pxCurrentTCB, &( pxReadyTasksLists[ uxTopPriority ] ) ); \
+ } /* taskSELECT_HIGHEST_PRIORITY_TASK() */
+
+ /*-----------------------------------------------------------*/
+
+ /* A port optimised version is provided, call it only if the TCB being reset
+ is being referenced from a ready list. If it is referenced from a delayed
+ or suspended list then it won't be in a ready list. */
+ #define taskRESET_READY_PRIORITY( uxPriority ) \
+ { \
+ if( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ ( uxPriority ) ] ) ) == 0 ) \
+ { \
+ portRESET_READY_PRIORITY( ( uxPriority ), ( uxTopReadyPriority ) ); \
+ } \
+ }
+
+#endif /* configUSE_PORT_OPTIMISED_TASK_SELECTION */
+
+/*-----------------------------------------------------------*/
+
+/* pxDelayedTaskList and pxOverflowDelayedTaskList are switched when the tick
+count overflows. */
+#define taskSWITCH_DELAYED_LISTS() \
+{ \
+ xList *pxTemp; \
+ \
+ /* The delayed tasks list should be empty when the lists are switched. */ \
+ configASSERT( ( listLIST_IS_EMPTY( pxDelayedTaskList ) ) ); \
+ \
+ pxTemp = pxDelayedTaskList; \
+ pxDelayedTaskList = pxOverflowDelayedTaskList; \
+ pxOverflowDelayedTaskList = pxTemp; \
+ xNumOfOverflows++; \
+ \
+ if( listLIST_IS_EMPTY( pxDelayedTaskList ) != pdFALSE ) \
+ { \
+ /* The new current delayed list is empty. Set \
+ xNextTaskUnblockTime to the maximum possible value so it is \
+ extremely unlikely that the \
+ if( xTickCount >= xNextTaskUnblockTime ) test will pass until \
+ there is an item in the delayed list. */ \
+ xNextTaskUnblockTime = portMAX_DELAY; \
+ } \
+ else \
+ { \
+ /* The new current delayed list is not empty, get the value of \
+ the item at the head of the delayed list. This is the time at \
+ which the task at the head of the delayed list should be removed \
+ from the Blocked state. */ \
+ pxTCB = ( tskTCB * ) listGET_OWNER_OF_HEAD_ENTRY( pxDelayedTaskList ); \
+ xNextTaskUnblockTime = listGET_LIST_ITEM_VALUE( &( pxTCB->xGenericListItem ) ); \
+ } \
+}
+
+/*-----------------------------------------------------------*/
+
+/*
+ * Place the task represented by pxTCB into the appropriate ready list for
+ * the task. It is inserted at the end of the list.
+ */
+#define prvAddTaskToReadyList( pxTCB ) \
+ traceMOVED_TASK_TO_READY_STATE( pxTCB ) \
+ taskRECORD_READY_PRIORITY( ( pxTCB )->uxPriority ); \
+ vListInsertEnd( &( pxReadyTasksLists[ ( pxTCB )->uxPriority ] ), &( ( pxTCB )->xGenericListItem ) )
+/*-----------------------------------------------------------*/
+
+/*
+ * Several functions take an xTaskHandle parameter that can optionally be NULL,
+ * where NULL is used to indicate that the handle of the currently executing
+ * task should be used in place of the parameter. This macro simply checks to
+ * see if the parameter is NULL and returns a pointer to the appropriate TCB.
+ */
+#define prvGetTCBFromHandle( pxHandle ) ( ( ( pxHandle ) == NULL ) ? ( tskTCB * ) pxCurrentTCB : ( tskTCB * ) ( pxHandle ) )
+
+/* Callback function prototypes. --------------------------*/
+extern void vApplicationStackOverflowHook( xTaskHandle xTask, signed char *pcTaskName );
+extern void vApplicationTickHook( void );
+
+/* File private functions. --------------------------------*/
+
+/*
+ * Utility to ready a TCB for a given task. Mainly just copies the parameters
+ * into the TCB structure.
+ */
+static void prvInitialiseTCBVariables( tskTCB *pxTCB, const signed char * const pcName, unsigned portBASE_TYPE uxPriority, const xMemoryRegion * const xRegions, unsigned short usStackDepth ) PRIVILEGED_FUNCTION;
+
+/*
+ * Utility to ready all the lists used by the scheduler. This is called
+ * automatically upon the creation of the first task.
+ */
+static void prvInitialiseTaskLists( void ) PRIVILEGED_FUNCTION;
+
+/*
+ * The idle task, which as all tasks is implemented as a never ending loop.
+ * The idle task is automatically created and added to the ready lists upon
+ * creation of the first user task.
+ *
+ * The portTASK_FUNCTION_PROTO() macro is used to allow port/compiler specific
+ * language extensions. The equivalent prototype for this function is:
+ *
+ * void prvIdleTask( void *pvParameters );
+ *
+ */
+static portTASK_FUNCTION_PROTO( prvIdleTask, pvParameters );
+
+/*
+ * Utility to free all memory allocated by the scheduler to hold a TCB,
+ * including the stack pointed to by the TCB.
+ *
+ * This does not free memory allocated by the task itself (i.e. memory
+ * allocated by calls to pvPortMalloc from within the tasks application code).
+ */
+#if ( INCLUDE_vTaskDelete == 1 )
+
+ static void prvDeleteTCB( tskTCB *pxTCB ) PRIVILEGED_FUNCTION;
+
+#endif
+
+/*
+ * Used only by the idle task. This checks to see if anything has been placed
+ * in the list of tasks waiting to be deleted. If so the task is cleaned up
+ * and its TCB deleted.
+ */
+static void prvCheckTasksWaitingTermination( void ) PRIVILEGED_FUNCTION;
+
+/*
+ * The currently executing task is entering the Blocked state. Add the task to
+ * either the current or the overflow delayed task list.
+ */
+static void prvAddCurrentTaskToDelayedList( portTickType xTimeToWake ) PRIVILEGED_FUNCTION;
+
+/*
+ * Allocates memory from the heap for a TCB and associated stack. Checks the
+ * allocation was successful.
+ */
+static tskTCB *prvAllocateTCBAndStack( unsigned short usStackDepth, portSTACK_TYPE *puxStackBuffer ) PRIVILEGED_FUNCTION;
+
+/*
+ * Fills an xTaskStatusType structure with information on each task that is
+ * referenced from the pxList list (which may be a ready list, a delayed list,
+ * a suspended list, etc.).
+ *
+ * THIS FUNCTION IS INTENDED FOR DEBUGGING ONLY, AND SHOULD NOT BE CALLED FROM
+ * NORMAL APPLICATION CODE.
+ */
+#if ( configUSE_TRACE_FACILITY == 1 )
+
+ static unsigned portBASE_TYPE prvListTaskWithinSingleList( xTaskStatusType *pxTaskStatusArray, xList *pxList, eTaskState eState ) PRIVILEGED_FUNCTION;
+
+#endif
+
+/*
+ * When a task is created, the stack of the task is filled with a known value.
+ * This function determines the 'high water mark' of the task stack by
+ * determining how much of the stack remains at the original preset value.
+ */
+#if ( ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark == 1 ) )
+
+ static unsigned short prvTaskCheckFreeStackSpace( const unsigned char * pucStackByte ) PRIVILEGED_FUNCTION;
+
+#endif
+
+/*
+ * Return the amount of time, in ticks, that will pass before the kernel will
+ * next move a task from the Blocked state to the Running state.
+ *
+ * This conditional compilation should use inequality to 0, not equality to 1.
+ * This is to ensure portSUPPRESS_TICKS_AND_SLEEP() can be called when user
+ * defined low power mode implementations require configUSE_TICKLESS_IDLE to be
+ * set to a value other than 1.
+ */
+#if ( configUSE_TICKLESS_IDLE != 0 )
+
+ static portTickType prvGetExpectedIdleTime( void ) PRIVILEGED_FUNCTION;
+
+#endif
+
+signed portBASE_TYPE xTaskGenericCreate( pdTASK_CODE pxTaskCode, const signed char * const pcName, unsigned short usStackDepth, void *pvParameters, unsigned portBASE_TYPE uxPriority, xTaskHandle *pxCreatedTask, portSTACK_TYPE *puxStackBuffer, const xMemoryRegion * const xRegions )
+{
+signed portBASE_TYPE xReturn;
+tskTCB * pxNewTCB;
+
+ configASSERT( pxTaskCode );
+ configASSERT( ( ( uxPriority & ( ~portPRIVILEGE_BIT ) ) < configMAX_PRIORITIES ) );
+
+ /* Allocate the memory required by the TCB and stack for the new task,
+ checking that the allocation was successful. */
+ pxNewTCB = prvAllocateTCBAndStack( usStackDepth, puxStackBuffer );
+
+ if( pxNewTCB != NULL )
+ {
+ portSTACK_TYPE *pxTopOfStack;
+
+ #if( portUSING_MPU_WRAPPERS == 1 )
+ /* Should the task be created in privileged mode? */
+ portBASE_TYPE xRunPrivileged;
+ if( ( uxPriority & portPRIVILEGE_BIT ) != 0U )
+ {
+ xRunPrivileged = pdTRUE;
+ }
+ else
+ {
+ xRunPrivileged = pdFALSE;
+ }
+ uxPriority &= ~portPRIVILEGE_BIT;
+ #endif /* portUSING_MPU_WRAPPERS == 1 */
+
+ /* Calculate the top of stack address. This depends on whether the
+ stack grows from high memory to low (as per the 80x86) or visa versa.
+ portSTACK_GROWTH is used to make the result positive or negative as
+ required by the port. */
+ #if( portSTACK_GROWTH < 0 )
+ {
+ pxTopOfStack = pxNewTCB->pxStack + ( usStackDepth - ( unsigned short ) 1 );
+ pxTopOfStack = ( portSTACK_TYPE * ) ( ( ( portPOINTER_SIZE_TYPE ) pxTopOfStack ) & ( ( portPOINTER_SIZE_TYPE ) ~portBYTE_ALIGNMENT_MASK ) ); /*lint !e923 MISRA exception. Avoiding casts between pointers and integers is not practical. Size differences accounted for using portPOINTER_SIZE_TYPE type. */
+
+ /* Check the alignment of the calculated top of stack is correct. */
+ configASSERT( ( ( ( unsigned long ) pxTopOfStack & ( unsigned long ) portBYTE_ALIGNMENT_MASK ) == 0UL ) );
+ }
+ #else /* portSTACK_GROWTH */
+ {
+ pxTopOfStack = pxNewTCB->pxStack;
+
+ /* Check the alignment of the stack buffer is correct. */
+ configASSERT( ( ( ( unsigned long ) pxNewTCB->pxStack & ( unsigned long ) portBYTE_ALIGNMENT_MASK ) == 0UL ) );
+
+ /* If we want to use stack checking on architectures that use
+ a positive stack growth direction then we also need to store the
+ other extreme of the stack space. */
+ pxNewTCB->pxEndOfStack = pxNewTCB->pxStack + ( usStackDepth - 1 );
+ }
+ #endif /* portSTACK_GROWTH */
+
+ /* Setup the newly allocated TCB with the initial state of the task. */
+ prvInitialiseTCBVariables( pxNewTCB, pcName, uxPriority, xRegions, usStackDepth );
+
+ /* Initialize the TCB stack to look as if the task was already running,
+ but had been interrupted by the scheduler. The return address is set
+ to the start of the task function. Once the stack has been initialised
+ the top of stack variable is updated. */
+ #if( portUSING_MPU_WRAPPERS == 1 )
+ {
+ pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxTaskCode, pvParameters, xRunPrivileged );
+ }
+ #else /* portUSING_MPU_WRAPPERS */
+ {
+ pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxTaskCode, pvParameters );
+ }
+ #endif /* portUSING_MPU_WRAPPERS */
+
+ if( ( void * ) pxCreatedTask != NULL )
+ {
+ /* Pass the TCB out - in an anonymous way. The calling function/
+ task can use this as a handle to delete the task later if
+ required.*/
+ *pxCreatedTask = ( xTaskHandle ) pxNewTCB;
+ }
+
+ /* Ensure interrupts don't access the task lists while they are being
+ updated. */
+ taskENTER_CRITICAL();
+ {
+ uxCurrentNumberOfTasks++;
+ if( pxCurrentTCB == NULL )
+ {
+ /* There are no other tasks, or all the other tasks are in
+ the suspended state - make this the current task. */
+ pxCurrentTCB = pxNewTCB;
+
+ if( uxCurrentNumberOfTasks == ( unsigned portBASE_TYPE ) 1 )
+ {
+ /* This is the first task to be created so do the preliminary
+ initialisation required. We will not recover if this call
+ fails, but we will report the failure. */
+ prvInitialiseTaskLists();
+ }
+ }
+ else
+ {
+ /* If the scheduler is not already running, make this task the
+ current task if it is the highest priority task to be created
+ so far. */
+ if( xSchedulerRunning == pdFALSE )
+ {
+ if( pxCurrentTCB->uxPriority <= uxPriority )
+ {
+ pxCurrentTCB = pxNewTCB;
+ }
+ }
+ }
+
+ uxTaskNumber++;
+
+ #if ( configUSE_TRACE_FACILITY == 1 )
+ {
+ /* Add a counter into the TCB for tracing only. */
+ pxNewTCB->uxTCBNumber = uxTaskNumber;
+ }
+ #endif /* configUSE_TRACE_FACILITY */
+ traceTASK_CREATE( pxNewTCB );
+
+ prvAddTaskToReadyList( pxNewTCB );
+
+ xReturn = pdPASS;
+ portSETUP_TCB( pxNewTCB );
+ }
+ taskEXIT_CRITICAL();
+ }
+ else
+ {
+ xReturn = errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY;
+ traceTASK_CREATE_FAILED();
+ }
+
+ if( xReturn == pdPASS )
+ {
+ if( xSchedulerRunning != pdFALSE )
+ {
+ /* If the created task is of a higher priority than the current task
+ then it should run now. */
+ if( pxCurrentTCB->uxPriority < uxPriority )
+ {
+ taskYIELD_IF_USING_PREEMPTION();
+ }
+ }
+ }
+
+ return xReturn;
+}
+/*-----------------------------------------------------------*/
+
+#if ( INCLUDE_vTaskDelete == 1 )
+
+ void vTaskDelete( xTaskHandle xTaskToDelete )
+ {
+ tskTCB *pxTCB;
+
+ taskENTER_CRITICAL();
+ {
+ /* If null is passed in here then we are deleting ourselves. */
+ pxTCB = prvGetTCBFromHandle( xTaskToDelete );
+
+ /* Remove task from the ready list and place in the termination list.
+ This will stop the task from be scheduled. The idle task will check
+ the termination list and free up any memory allocated by the
+ scheduler for the TCB and stack. */
+ if( uxListRemove( &( pxTCB->xGenericListItem ) ) == ( unsigned portBASE_TYPE ) 0 )
+ {
+ taskRESET_READY_PRIORITY( pxTCB->uxPriority );
+ }
+
+ /* Is the task waiting on an event also? */
+ if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
+ {
+ ( void ) uxListRemove( &( pxTCB->xEventListItem ) );
+ }
+
+ vListInsertEnd( &xTasksWaitingTermination, &( pxTCB->xGenericListItem ) );
+
+ /* Increment the ucTasksDeleted variable so the idle task knows
+ there is a task that has been deleted and that it should therefore
+ check the xTasksWaitingTermination list. */
+ ++uxTasksDeleted;
+
+ /* Increment the uxTaskNumberVariable also so kernel aware debuggers
+ can detect that the task lists need re-generating. */
+ uxTaskNumber++;
+
+ traceTASK_DELETE( pxTCB );
+ }
+ taskEXIT_CRITICAL();
+
+ /* Force a reschedule if we have just deleted the current task. */
+ if( xSchedulerRunning != pdFALSE )
+ {
+ if( pxTCB == pxCurrentTCB )
+ {
+ portYIELD_WITHIN_API();
+ }
+ }
+ }
+
+#endif /* INCLUDE_vTaskDelete */
+/*-----------------------------------------------------------*/
+
+#if ( INCLUDE_vTaskDelayUntil == 1 )
+
+ void vTaskDelayUntil( portTickType * const pxPreviousWakeTime, portTickType xTimeIncrement )
+ {
+ portTickType xTimeToWake;
+ portBASE_TYPE xAlreadyYielded, xShouldDelay = pdFALSE;
+
+ configASSERT( pxPreviousWakeTime );
+ configASSERT( ( xTimeIncrement > 0U ) );
+
+ vTaskSuspendAll();
+ {
+ /* Minor optimisation. The tick count cannot change in this
+ block. */
+ const portTickType xConstTickCount = xTickCount;
+
+ /* Generate the tick time at which the task wants to wake. */
+ xTimeToWake = *pxPreviousWakeTime + xTimeIncrement;
+
+ if( xConstTickCount < *pxPreviousWakeTime )
+ {
+ /* The tick count has overflowed since this function was
+ lasted called. In this case the only time we should ever
+ actually delay is if the wake time has also overflowed,
+ and the wake time is greater than the tick time. When this
+ is the case it is as if neither time had overflowed. */
+ if( ( xTimeToWake < *pxPreviousWakeTime ) && ( xTimeToWake > xConstTickCount ) )
+ {
+ xShouldDelay = pdTRUE;
+ }
+ }
+ else
+ {
+ /* The tick time has not overflowed. In this case we will
+ delay if either the wake time has overflowed, and/or the
+ tick time is less than the wake time. */
+ if( ( xTimeToWake < *pxPreviousWakeTime ) || ( xTimeToWake > xConstTickCount ) )
+ {
+ xShouldDelay = pdTRUE;
+ }
+ }
+
+ /* Update the wake time ready for the next call. */
+ *pxPreviousWakeTime = xTimeToWake;
+
+ if( xShouldDelay != pdFALSE )
+ {
+ traceTASK_DELAY_UNTIL();
+
+ /* We must remove ourselves from the ready list before adding
+ ourselves to the blocked list as the same list item is used for
+ both lists. */
+ if( uxListRemove( &( pxCurrentTCB->xGenericListItem ) ) == ( unsigned portBASE_TYPE ) 0 )
+ {
+ /* The current task must be in a ready list, so there is
+ no need to check, and the port reset macro can be called
+ directly. */
+ portRESET_READY_PRIORITY( pxCurrentTCB->uxPriority, uxTopReadyPriority );
+ }
+
+ prvAddCurrentTaskToDelayedList( xTimeToWake );
+ }
+ }
+ xAlreadyYielded = xTaskResumeAll();
+
+ /* Force a reschedule if xTaskResumeAll has not already done so, we may
+ have put ourselves to sleep. */
+ if( xAlreadyYielded == pdFALSE )
+ {
+ portYIELD_WITHIN_API();
+ }
+ }
+
+#endif /* INCLUDE_vTaskDelayUntil */
+/*-----------------------------------------------------------*/
+
+#if ( INCLUDE_vTaskDelay == 1 )
+
+ void vTaskDelay( portTickType xTicksToDelay )
+ {
+ portTickType xTimeToWake;
+ signed portBASE_TYPE xAlreadyYielded = pdFALSE;
+
+ /* A delay time of zero just forces a reschedule. */
+ if( xTicksToDelay > ( portTickType ) 0U )
+ {
+ vTaskSuspendAll();
+ {
+ traceTASK_DELAY();
+
+ /* A task that is removed from the event list while the
+ scheduler is suspended will not get placed in the ready
+ list or removed from the blocked list until the scheduler
+ is resumed.
+
+ This task cannot be in an event list as it is the currently
+ executing task. */
+
+ /* Calculate the time to wake - this may overflow but this is
+ not a problem. */
+ xTimeToWake = xTickCount + xTicksToDelay;
+
+ /* We must remove ourselves from the ready list before adding
+ ourselves to the blocked list as the same list item is used for
+ both lists. */
+ if( uxListRemove( &( pxCurrentTCB->xGenericListItem ) ) == ( unsigned portBASE_TYPE ) 0 )
+ {
+ /* The current task must be in a ready list, so there is
+ no need to check, and the port reset macro can be called
+ directly. */
+ portRESET_READY_PRIORITY( pxCurrentTCB->uxPriority, uxTopReadyPriority );
+ }
+ prvAddCurrentTaskToDelayedList( xTimeToWake );
+ }
+ xAlreadyYielded = xTaskResumeAll();
+ }
+
+ /* Force a reschedule if xTaskResumeAll has not already done so, we may
+ have put ourselves to sleep. */
+ if( xAlreadyYielded == pdFALSE )
+ {
+ portYIELD_WITHIN_API();
+ }
+ }
+
+#endif /* INCLUDE_vTaskDelay */
+/*-----------------------------------------------------------*/
+
+#if ( INCLUDE_eTaskGetState == 1 )
+
+ eTaskState eTaskGetState( xTaskHandle xTask )
+ {
+ eTaskState eReturn;
+ xList *pxStateList;
+ const tskTCB * const pxTCB = ( tskTCB * ) xTask;
+
+ if( pxTCB == pxCurrentTCB )
+ {
+ /* The task calling this function is querying its own state. */
+ eReturn = eRunning;
+ }
+ else
+ {
+ taskENTER_CRITICAL();
+ {
+ pxStateList = ( xList * ) listLIST_ITEM_CONTAINER( &( pxTCB->xGenericListItem ) );
+ }
+ taskEXIT_CRITICAL();
+
+ if( ( pxStateList == pxDelayedTaskList ) || ( pxStateList == pxOverflowDelayedTaskList ) )
+ {
+ /* The task being queried is referenced from one of the Blocked
+ lists. */
+ eReturn = eBlocked;
+ }
+
+ #if ( INCLUDE_vTaskSuspend == 1 )
+ else if( pxStateList == &xSuspendedTaskList )
+ {
+ /* The task being queried is referenced from the suspended
+ list. Is it genuinely suspended or is it block
+ indefinitely? */
+ if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) == NULL )
+ {
+ eReturn = eSuspended;
+ }
+ else
+ {
+ eReturn = eBlocked;
+ }
+ }
+ #endif
+
+ #if ( INCLUDE_vTaskDelete == 1 )
+ else if( pxStateList == &xTasksWaitingTermination )
+ {
+ /* The task being queried is referenced from the deleted
+ tasks list. */
+ eReturn = eDeleted;
+ }
+ #endif
+
+ else
+ {
+ /* If the task is not in any other state, it must be in the
+ Ready (including pending ready) state. */
+ eReturn = eReady;
+ }
+ }
+
+ return eReturn;
+ }
+
+#endif /* INCLUDE_eTaskGetState */
+/*-----------------------------------------------------------*/
+
+#if ( INCLUDE_uxTaskPriorityGet == 1 )
+
+ unsigned portBASE_TYPE uxTaskPriorityGet( xTaskHandle xTask )
+ {
+ tskTCB *pxTCB;
+ unsigned portBASE_TYPE uxReturn;
+
+ taskENTER_CRITICAL();
+ {
+ /* If null is passed in here then we are changing the
+ priority of the calling function. */
+ pxTCB = prvGetTCBFromHandle( xTask );
+ uxReturn = pxTCB->uxPriority;
+ }
+ taskEXIT_CRITICAL();
+
+ return uxReturn;
+ }
+
+#endif /* INCLUDE_uxTaskPriorityGet */
+/*-----------------------------------------------------------*/
+
+#if ( INCLUDE_vTaskPrioritySet == 1 )
+
+ void vTaskPrioritySet( xTaskHandle xTask, unsigned portBASE_TYPE uxNewPriority )
+ {
+ tskTCB *pxTCB;
+ unsigned portBASE_TYPE uxCurrentBasePriority, uxPriorityUsedOnEntry;
+ portBASE_TYPE xYieldRequired = pdFALSE;
+
+ configASSERT( ( uxNewPriority < configMAX_PRIORITIES ) );
+
+ /* Ensure the new priority is valid. */
+ if( uxNewPriority >= ( unsigned portBASE_TYPE ) configMAX_PRIORITIES )
+ {
+ uxNewPriority = ( unsigned portBASE_TYPE ) configMAX_PRIORITIES - ( unsigned portBASE_TYPE ) 1U;
+ }
+
+ taskENTER_CRITICAL();
+ {
+ /* If null is passed in here then it is the priority of the calling
+ task that is being changed. */
+ pxTCB = prvGetTCBFromHandle( xTask );
+
+ traceTASK_PRIORITY_SET( pxTCB, uxNewPriority );
+
+ #if ( configUSE_MUTEXES == 1 )
+ {
+ uxCurrentBasePriority = pxTCB->uxBasePriority;
+ }
+ #else
+ {
+ uxCurrentBasePriority = pxTCB->uxPriority;
+ }
+ #endif
+
+ if( uxCurrentBasePriority != uxNewPriority )
+ {
+ /* The priority change may have readied a task of higher
+ priority than the calling task. */
+ if( uxNewPriority > uxCurrentBasePriority )
+ {
+ if( pxTCB != pxCurrentTCB )
+ {
+ /* The priority of a task other than the currently
+ running task is being raised. Is the priority being
+ raised above that of the running task? */
+ if( uxNewPriority >= pxCurrentTCB->uxPriority )
+ {
+ xYieldRequired = pdTRUE;
+ }
+ }
+ else
+ {
+ /* The priority of the running task is being raised,
+ but the running task must already be the highest
+ priority task able to run so no yield is required. */
+ }
+ }
+ else if( pxTCB == pxCurrentTCB )
+ {
+ /* Setting the priority of the running task down means
+ there may now be another task of higher priority that
+ is ready to execute. */
+ xYieldRequired = pdTRUE;
+ }
+ else
+ {
+ /* Setting the priority of any other task down does not
+ require a yield as the running task must be above the
+ new priority of the task being modified. */
+ }
+
+ /* Remember the ready list the task might be referenced from
+ before its uxPriority member is changed so the
+ taskRESET_READY_PRIORITY() macro can function correctly. */
+ uxPriorityUsedOnEntry = pxTCB->uxPriority;
+
+ #if ( configUSE_MUTEXES == 1 )
+ {
+ /* Only change the priority being used if the task is not
+ currently using an inherited priority. */
+ if( pxTCB->uxBasePriority == pxTCB->uxPriority )
+ {
+ pxTCB->uxPriority = uxNewPriority;
+ }
+
+ /* The base priority gets set whatever. */
+ pxTCB->uxBasePriority = uxNewPriority;
+ }
+ #else
+ {
+ pxTCB->uxPriority = uxNewPriority;
+ }
+ #endif
+
+ listSET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ), ( ( portTickType ) configMAX_PRIORITIES - ( portTickType ) uxNewPriority ) ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
+
+ /* If the task is in the blocked or suspended list we need do
+ nothing more than change it's priority variable. However, if
+ the task is in a ready list it needs to be removed and placed
+ in the list appropriate to its new priority. */
+ if( listIS_CONTAINED_WITHIN( &( pxReadyTasksLists[ uxPriorityUsedOnEntry ] ), &( pxTCB->xGenericListItem ) ) != pdFALSE )
+ {
+ /* The task is currently in its ready list - remove before adding
+ it to it's new ready list. As we are in a critical section we
+ can do this even if the scheduler is suspended. */
+ if( uxListRemove( &( pxTCB->xGenericListItem ) ) == ( unsigned portBASE_TYPE ) 0 )
+ {
+ /* It is known that the task is in its ready list so
+ there is no need to check again and the port level
+ reset macro can be called directly. */
+ portRESET_READY_PRIORITY( uxPriorityUsedOnEntry, uxTopReadyPriority );
+ }
+ prvAddTaskToReadyList( pxTCB );
+ }
+
+ if( xYieldRequired == pdTRUE )
+ {
+ taskYIELD_IF_USING_PREEMPTION();
+ }
+
+ /* Remove compiler warning about unused variables when the port
+ optimised task selection is not being used. */
+ ( void ) uxPriorityUsedOnEntry;
+ }
+ }
+ taskEXIT_CRITICAL();
+ }
+
+#endif /* INCLUDE_vTaskPrioritySet */
+/*-----------------------------------------------------------*/
+
+#if ( INCLUDE_vTaskSuspend == 1 )
+
+ void vTaskSuspend( xTaskHandle xTaskToSuspend )
+ {
+ tskTCB *pxTCB;
+
+ taskENTER_CRITICAL();
+ {
+ /* If null is passed in here then it is the running task that is
+ being suspended. */
+ pxTCB = prvGetTCBFromHandle( xTaskToSuspend );
+
+ traceTASK_SUSPEND( pxTCB );
+
+ /* Remove task from the ready/delayed list and place in the suspended list. */
+ if( uxListRemove( &( pxTCB->xGenericListItem ) ) == ( unsigned portBASE_TYPE ) 0 )
+ {
+ taskRESET_READY_PRIORITY( pxTCB->uxPriority );
+ }
+
+ /* Is the task waiting on an event also? */
+ if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
+ {
+ ( void ) uxListRemove( &( pxTCB->xEventListItem ) );
+ }
+
+ vListInsertEnd( &xSuspendedTaskList, &( pxTCB->xGenericListItem ) );
+ }
+ taskEXIT_CRITICAL();
+
+ if( pxTCB == pxCurrentTCB )
+ {
+ if( xSchedulerRunning != pdFALSE )
+ {
+ /* The current task has just been suspended. */
+ portYIELD_WITHIN_API();
+ }
+ else
+ {
+ /* The scheduler is not running, but the task that was pointed
+ to by pxCurrentTCB has just been suspended and pxCurrentTCB
+ must be adjusted to point to a different task. */
+ if( listCURRENT_LIST_LENGTH( &xSuspendedTaskList ) == uxCurrentNumberOfTasks )
+ {
+ /* No other tasks are ready, so set pxCurrentTCB back to
+ NULL so when the next task is created pxCurrentTCB will
+ be set to point to it no matter what its relative priority
+ is. */
+ pxCurrentTCB = NULL;
+ }
+ else
+ {
+ vTaskSwitchContext();
+ }
+ }
+ }
+ }
+
+#endif /* INCLUDE_vTaskSuspend */
+/*-----------------------------------------------------------*/
+
+#if ( INCLUDE_vTaskSuspend == 1 )
+
+ signed portBASE_TYPE xTaskIsTaskSuspended( xTaskHandle xTask )
+ {
+ portBASE_TYPE xReturn = pdFALSE;
+ const tskTCB * const pxTCB = ( tskTCB * ) xTask;
+
+ /* It does not make sense to check if the calling task is suspended. */
+ configASSERT( xTask );
+
+ /* Is the task we are attempting to resume actually in the
+ suspended list? */
+ if( listIS_CONTAINED_WITHIN( &xSuspendedTaskList, &( pxTCB->xGenericListItem ) ) != pdFALSE )
+ {
+ /* Has the task already been resumed from within an ISR? */
+ if( listIS_CONTAINED_WITHIN( &xPendingReadyList, &( pxTCB->xEventListItem ) ) == pdFALSE )
+ {
+ /* Is it in the suspended list because it is in the
+ Suspended state? It is possible to be in the suspended
+ list because it is blocked on a task with no timeout
+ specified. */
+ if( listIS_CONTAINED_WITHIN( NULL, &( pxTCB->xEventListItem ) ) != pdFALSE )
+ {
+ xReturn = pdTRUE;
+ }
+ }
+ }
+
+ return xReturn;
+ } /*lint !e818 xTask cannot be a pointer to const because it is a typedef. */
+
+#endif /* INCLUDE_vTaskSuspend */
+/*-----------------------------------------------------------*/
+
+#if ( INCLUDE_vTaskSuspend == 1 )
+
+ void vTaskResume( xTaskHandle xTaskToResume )
+ {
+ tskTCB * const pxTCB = ( tskTCB * ) xTaskToResume;
+
+ /* It does not make sense to resume the calling task. */
+ configASSERT( xTaskToResume );
+
+ /* The parameter cannot be NULL as it is impossible to resume the
+ currently executing task. */
+ if( ( pxTCB != NULL ) && ( pxTCB != pxCurrentTCB ) )
+ {
+ taskENTER_CRITICAL();
+ {
+ if( xTaskIsTaskSuspended( pxTCB ) == pdTRUE )
+ {
+ traceTASK_RESUME( pxTCB );
+
+ /* As we are in a critical section we can access the ready
+ lists even if the scheduler is suspended. */
+ ( void ) uxListRemove( &( pxTCB->xGenericListItem ) );
+ prvAddTaskToReadyList( pxTCB );
+
+ /* We may have just resumed a higher priority task. */
+ if( pxTCB->uxPriority >= pxCurrentTCB->uxPriority )
+ {
+ /* This yield may not cause the task just resumed to run,
+ but will leave the lists in the correct state for the
+ next yield. */
+ taskYIELD_IF_USING_PREEMPTION();
+ }
+ }
+ }
+ taskEXIT_CRITICAL();
+ }
+ }
+
+#endif /* INCLUDE_vTaskSuspend */
+
+/*-----------------------------------------------------------*/
+
+#if ( ( INCLUDE_xTaskResumeFromISR == 1 ) && ( INCLUDE_vTaskSuspend == 1 ) )
+
+ portBASE_TYPE xTaskResumeFromISR( xTaskHandle xTaskToResume )
+ {
+ portBASE_TYPE xYieldRequired = pdFALSE;
+ tskTCB * const pxTCB = ( tskTCB * ) xTaskToResume;
+ unsigned portBASE_TYPE uxSavedInterruptStatus;
+
+ configASSERT( xTaskToResume );
+
+ /* RTOS ports that support interrupt nesting have the concept of a
+ maximum system call (or maximum API call) interrupt priority.
+ Interrupts that are above the maximum system call priority are keep
+ permanently enabled, even when the RTOS kernel is in a critical section,
+ but cannot make any calls to FreeRTOS API functions. If configASSERT()
+ is defined in FreeRTOSConfig.h then
+ portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion
+ failure if a FreeRTOS API function is called from an interrupt that has
+ been assigned a priority above the configured maximum system call
+ priority. Only FreeRTOS functions that end in FromISR can be called
+ from interrupts that have been assigned a priority at or (logically)
+ below the maximum system call interrupt priority. FreeRTOS maintains a
+ separate interrupt safe API to ensure interrupt entry is as fast and as
+ simple as possible. More information (albeit Cortex-M specific) is
+ provided on the following link:
+ http://www.freertos.org/RTOS-Cortex-M3-M4.html */
+ portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
+
+ uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
+ {
+ if( xTaskIsTaskSuspended( pxTCB ) == pdTRUE )
+ {
+ traceTASK_RESUME_FROM_ISR( pxTCB );
+
+ if( uxSchedulerSuspended == ( unsigned portBASE_TYPE ) pdFALSE )
+ {
+ if( pxTCB->uxPriority >= pxCurrentTCB->uxPriority )
+ {
+ xYieldRequired = pdTRUE;
+ }
+
+ ( void ) uxListRemove( &( pxTCB->xGenericListItem ) );
+ prvAddTaskToReadyList( pxTCB );
+ }
+ else
+ {
+ /* We cannot access the delayed or ready lists, so will hold this
+ task pending until the scheduler is resumed, at which point a
+ yield will be performed if necessary. */
+ vListInsertEnd( &( xPendingReadyList ), &( pxTCB->xEventListItem ) );
+ }
+ }
+ }
+ portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
+
+ return xYieldRequired;
+ }
+
+#endif /* ( ( INCLUDE_xTaskResumeFromISR == 1 ) && ( INCLUDE_vTaskSuspend == 1 ) ) */
+/*-----------------------------------------------------------*/
+
+void vTaskStartScheduler( void )
+{
+portBASE_TYPE xReturn;
+
+ /* Add the idle task at the lowest priority. */
+ #if ( INCLUDE_xTaskGetIdleTaskHandle == 1 )
+ {
+ /* Create the idle task, storing its handle in xIdleTaskHandle so it can
+ be returned by the xTaskGetIdleTaskHandle() function. */
+ xReturn = xTaskCreate( prvIdleTask, ( signed char * ) "IDLE", tskIDLE_STACK_SIZE, ( void * ) NULL, ( tskIDLE_PRIORITY | portPRIVILEGE_BIT ), &xIdleTaskHandle ); /*lint !e961 MISRA exception, justified as it is not a redundant explicit cast to all supported compilers. */
+ }
+ #else
+ {
+ /* Create the idle task without storing its handle. */
+ xReturn = xTaskCreate( prvIdleTask, ( signed char * ) "IDLE", tskIDLE_STACK_SIZE, ( void * ) NULL, ( tskIDLE_PRIORITY | portPRIVILEGE_BIT ), NULL ); /*lint !e961 MISRA exception, justified as it is not a redundant explicit cast to all supported compilers. */
+ }
+ #endif /* INCLUDE_xTaskGetIdleTaskHandle */
+
+ #if ( configUSE_TIMERS == 1 )
+ {
+ if( xReturn == pdPASS )
+ {
+ xReturn = xTimerCreateTimerTask();
+ }
+ }
+ #endif /* configUSE_TIMERS */
+
+ if( xReturn == pdPASS )
+ {
+ /* Interrupts are turned off here, to ensure a tick does not occur
+ before or during the call to xPortStartScheduler(). The stacks of
+ the created tasks contain a status word with interrupts switched on
+ so interrupts will automatically get re-enabled when the first task
+ starts to run. */
+ portDISABLE_INTERRUPTS();
+
+ #if ( configUSE_NEWLIB_REENTRANT == 1 )
+ {
+ /* Switch Newlib's _impure_ptr variable to point to the _reent
+ structure specific to the task that will run first. */
+ _impure_ptr = &( pxCurrentTCB->xNewLib_reent );
+ }
+ #endif /* configUSE_NEWLIB_REENTRANT */
+
+ xSchedulerRunning = pdTRUE;
+ xTickCount = ( portTickType ) 0U;
+
+ /* If configGENERATE_RUN_TIME_STATS is defined then the following
+ macro must be defined to configure the timer/counter used to generate
+ the run time counter time base. */
+ portCONFIGURE_TIMER_FOR_RUN_TIME_STATS();
+
+ /* Setting up the timer tick is hardware specific and thus in the
+ portable interface. */
+ if( xPortStartScheduler() != pdFALSE )
+ {
+ /* Should not reach here as if the scheduler is running the
+ function will not return. */
+ }
+ else
+ {
+ /* Should only reach here if a task calls xTaskEndScheduler(). */
+ }
+ }
+ else
+ {
+ /* This line will only be reached if the kernel could not be started,
+ because there was not enough FreeRTOS heap to create the idle task
+ or the timer task. */
+ configASSERT( xReturn );
+ }
+}
+/*-----------------------------------------------------------*/
+
+void vTaskEndScheduler( void )
+{
+ /* Stop the scheduler interrupts and call the portable scheduler end
+ routine so the original ISRs can be restored if necessary. The port
+ layer must ensure interrupts enable bit is left in the correct state. */
+ portDISABLE_INTERRUPTS();
+ xSchedulerRunning = pdFALSE;
+ vPortEndScheduler();
+}
+/*----------------------------------------------------------*/
+
+void vTaskSuspendAll( void )
+{
+ /* A critical section is not required as the variable is of type
+ portBASE_TYPE. */
+ ++uxSchedulerSuspended;
+}
+/*----------------------------------------------------------*/
+
+#if ( configUSE_TICKLESS_IDLE != 0 )
+
+ static portTickType prvGetExpectedIdleTime( void )
+ {
+ portTickType xReturn;
+
+ if( pxCurrentTCB->uxPriority > tskIDLE_PRIORITY )
+ {
+ xReturn = 0;
+ }
+ else if( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ tskIDLE_PRIORITY ] ) ) > 1 )
+ {
+ /* There are other idle priority tasks in the ready state. If
+ time slicing is used then the very next tick interrupt must be
+ processed. */
+ xReturn = 0;
+ }
+ else
+ {
+ xReturn = xNextTaskUnblockTime - xTickCount;
+ }
+
+ return xReturn;
+ }
+
+#endif /* configUSE_TICKLESS_IDLE */
+/*----------------------------------------------------------*/
+
+signed portBASE_TYPE xTaskResumeAll( void )
+{
+tskTCB *pxTCB;
+portBASE_TYPE xAlreadyYielded = pdFALSE;
+
+ /* If uxSchedulerSuspended is zero then this function does not match a
+ previous call to vTaskSuspendAll(). */
+ configASSERT( uxSchedulerSuspended );
+
+ /* It is possible that an ISR caused a task to be removed from an event
+ list while the scheduler was suspended. If this was the case then the
+ removed task will have been added to the xPendingReadyList. Once the
+ scheduler has been resumed it is safe to move all the pending ready
+ tasks from this list into their appropriate ready list. */
+ taskENTER_CRITICAL();
+ {
+ --uxSchedulerSuspended;
+
+ if( uxSchedulerSuspended == ( unsigned portBASE_TYPE ) pdFALSE )
+ {
+ if( uxCurrentNumberOfTasks > ( unsigned portBASE_TYPE ) 0U )
+ {
+ /* Move any readied tasks from the pending list into the
+ appropriate ready list. */
+ while( listLIST_IS_EMPTY( &xPendingReadyList ) == pdFALSE )
+ {
+ pxTCB = ( tskTCB * ) listGET_OWNER_OF_HEAD_ENTRY( ( &xPendingReadyList ) );
+ ( void ) uxListRemove( &( pxTCB->xEventListItem ) );
+ ( void ) uxListRemove( &( pxTCB->xGenericListItem ) );
+ prvAddTaskToReadyList( pxTCB );
+
+ /* If we have moved a task that has a priority higher than
+ the current task then we should yield. */
+ if( pxTCB->uxPriority >= pxCurrentTCB->uxPriority )
+ {
+ xYieldPending = pdTRUE;
+ }
+ }
+
+ /* If any ticks occurred while the scheduler was suspended then
+ they should be processed now. This ensures the tick count does not
+ slip, and that any delayed tasks are resumed at the correct time. */
+ if( uxPendedTicks > ( unsigned portBASE_TYPE ) 0U )
+ {
+ while( uxPendedTicks > ( unsigned portBASE_TYPE ) 0U )
+ {
+ if( xTaskIncrementTick() != pdFALSE )
+ {
+ xYieldPending = pdTRUE;
+ }
+ --uxPendedTicks;
+ }
+ }
+
+ if( xYieldPending == pdTRUE )
+ {
+ #if( configUSE_PREEMPTION != 0 )
+ {
+ xAlreadyYielded = pdTRUE;
+ }
+ #endif
+ taskYIELD_IF_USING_PREEMPTION();
+ }
+ }
+ }
+ }
+ taskEXIT_CRITICAL();
+
+ return xAlreadyYielded;
+}
+/*-----------------------------------------------------------*/
+
+portTickType xTaskGetTickCount( void )
+{
+portTickType xTicks;
+
+ /* Critical section required if running on a 16 bit processor. */
+ taskENTER_CRITICAL();
+ {
+ xTicks = xTickCount;
+ }
+ taskEXIT_CRITICAL();
+
+ return xTicks;
+}
+/*-----------------------------------------------------------*/
+
+portTickType xTaskGetTickCountFromISR( void )
+{
+portTickType xReturn;
+unsigned portBASE_TYPE uxSavedInterruptStatus;
+
+ /* RTOS ports that support interrupt nesting have the concept of a maximum
+ system call (or maximum API call) interrupt priority. Interrupts that are
+ above the maximum system call priority are keep permanently enabled, even
+ when the RTOS kernel is in a critical section, but cannot make any calls to
+ FreeRTOS API functions. If configASSERT() is defined in FreeRTOSConfig.h
+ then portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion
+ failure if a FreeRTOS API function is called from an interrupt that has been
+ assigned a priority above the configured maximum system call priority.
+ Only FreeRTOS functions that end in FromISR can be called from interrupts
+ that have been assigned a priority at or (logically) below the maximum
+ system call interrupt priority. FreeRTOS maintains a separate interrupt
+ safe API to ensure interrupt entry is as fast and as simple as possible.
+ More information (albeit Cortex-M specific) is provided on the following
+ link: http://www.freertos.org/RTOS-Cortex-M3-M4.html */
+ portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
+
+ uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
+ xReturn = xTickCount;
+ portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
+
+ return xReturn;
+}
+/*-----------------------------------------------------------*/
+
+unsigned portBASE_TYPE uxTaskGetNumberOfTasks( void )
+{
+ /* A critical section is not required because the variables are of type
+ portBASE_TYPE. */
+ return uxCurrentNumberOfTasks;
+}
+/*-----------------------------------------------------------*/
+
+#if ( INCLUDE_pcTaskGetTaskName == 1 )
+
+ signed char *pcTaskGetTaskName( xTaskHandle xTaskToQuery )
+ {
+ tskTCB *pxTCB;
+
+ /* If null is passed in here then the name of the calling task is being queried. */
+ pxTCB = prvGetTCBFromHandle( xTaskToQuery );
+ configASSERT( pxTCB );
+ return &( pxTCB->pcTaskName[ 0 ] );
+ }
+
+#endif /* INCLUDE_pcTaskGetTaskName */
+/*-----------------------------------------------------------*/
+
+#if ( configUSE_TRACE_FACILITY == 1 )
+
+ unsigned portBASE_TYPE uxTaskGetSystemState( xTaskStatusType *pxTaskStatusArray, unsigned portBASE_TYPE uxArraySize, unsigned long *pulTotalRunTime )
+ {
+ unsigned portBASE_TYPE uxTask = 0, uxQueue = configMAX_PRIORITIES;
+
+ vTaskSuspendAll();
+ {
+ /* Is there a space in the array for each task in the system? */
+ if( uxArraySize >= uxCurrentNumberOfTasks )
+ {
+ /* Fill in an xTaskStatusType structure with information on each
+ task in the Ready state. */
+ do
+ {
+ uxQueue--;
+ uxTask += prvListTaskWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), &( pxReadyTasksLists[ uxQueue ] ), eReady );
+
+ } while( uxQueue > ( unsigned portBASE_TYPE ) tskIDLE_PRIORITY ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
+
+ /* Fill in an xTaskStatusType structure with information on each
+ task in the Blocked state. */
+ uxTask += prvListTaskWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), ( xList * ) pxDelayedTaskList, eBlocked );
+ uxTask += prvListTaskWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), ( xList * ) pxOverflowDelayedTaskList, eBlocked );
+
+ #if( INCLUDE_vTaskDelete == 1 )
+ {
+ /* Fill in an xTaskStatusType structure with information on
+ each task that has been deleted but not yet cleaned up. */
+ uxTask += prvListTaskWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), &xTasksWaitingTermination, eDeleted );
+ }
+ #endif
+
+ #if ( INCLUDE_vTaskSuspend == 1 )
+ {
+ /* Fill in an xTaskStatusType structure with information on
+ each task in the Suspended state. */
+ uxTask += prvListTaskWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), &xSuspendedTaskList, eSuspended );
+ }
+ #endif
+
+ #if ( configGENERATE_RUN_TIME_STATS == 1)
+ {
+ if( pulTotalRunTime != NULL )
+ {
+ #ifdef portALT_GET_RUN_TIME_COUNTER_VALUE
+ portALT_GET_RUN_TIME_COUNTER_VALUE( ( *pulTotalRunTime ) );
+ #else
+ *pulTotalRunTime = portGET_RUN_TIME_COUNTER_VALUE();
+ #endif
+ }
+ }
+ #else
+ {
+ if( pulTotalRunTime != NULL )
+ {
+ *pulTotalRunTime = 0;
+ }
+ }
+ #endif
+ }
+ }
+ ( void ) xTaskResumeAll();
+
+ return uxTask;
+ }
+
+#endif /* configUSE_TRACE_FACILITY */
+/*----------------------------------------------------------*/
+
+#if ( INCLUDE_xTaskGetIdleTaskHandle == 1 )
+
+ xTaskHandle xTaskGetIdleTaskHandle( void )
+ {
+ /* If xTaskGetIdleTaskHandle() is called before the scheduler has been
+ started, then xIdleTaskHandle will be NULL. */
+ configASSERT( ( xIdleTaskHandle != NULL ) );
+ return xIdleTaskHandle;
+ }
+
+#endif /* INCLUDE_xTaskGetIdleTaskHandle */
+/*----------------------------------------------------------*/
+
+/* This conditional compilation should use inequality to 0, not equality to 1.
+This is to ensure vTaskStepTick() is available when user defined low power mode
+implementations require configUSE_TICKLESS_IDLE to be set to a value other than
+1. */
+#if ( configUSE_TICKLESS_IDLE != 0 )
+
+ void vTaskStepTick( portTickType xTicksToJump )
+ {
+ /* Correct the tick count value after a period during which the tick
+ was suppressed. Note this does *not* call the tick hook function for
+ each stepped tick. */
+ configASSERT( ( xTickCount + xTicksToJump ) <= xNextTaskUnblockTime );
+ xTickCount += xTicksToJump;
+ traceINCREASE_TICK_COUNT( xTicksToJump );
+ }
+
+#endif /* configUSE_TICKLESS_IDLE */
+/*----------------------------------------------------------*/
+
+portBASE_TYPE xTaskIncrementTick( void )
+{
+tskTCB * pxTCB;
+portTickType xItemValue;
+portBASE_TYPE xSwitchRequired = pdFALSE;
+
+ /* Called by the portable layer each time a tick interrupt occurs.
+ Increments the tick then checks to see if the new tick value will cause any
+ tasks to be unblocked. */
+ traceTASK_INCREMENT_TICK( xTickCount );
+ if( uxSchedulerSuspended == ( unsigned portBASE_TYPE ) pdFALSE )
+ {
+ /* Increment the RTOS tick, switching the delayed and overflowed
+ delayed lists if it wraps to 0. */
+ ++xTickCount;
+
+ {
+ /* Minor optimisation. The tick count cannot change in this
+ block. */
+ const portTickType xConstTickCount = xTickCount;
+
+ if( xConstTickCount == ( portTickType ) 0U )
+ {
+ taskSWITCH_DELAYED_LISTS();
+ }
+
+ /* See if this tick has made a timeout expire. Tasks are stored in the
+ queue in the order of their wake time - meaning once one tasks has been
+ found whose block time has not expired there is no need not look any
+ further down the list. */
+ if( xConstTickCount >= xNextTaskUnblockTime )
+ {
+ for( ;; )
+ {
+ if( listLIST_IS_EMPTY( pxDelayedTaskList ) != pdFALSE )
+ {
+ /* The delayed list is empty. Set xNextTaskUnblockTime to
+ the maximum possible value so it is extremely unlikely that
+ the if( xTickCount >= xNextTaskUnblockTime ) test will pass
+ next time through. */
+ xNextTaskUnblockTime = portMAX_DELAY;
+ break;
+ }
+ else
+ {
+ /* The delayed list is not empty, get the value of the item
+ at the head of the delayed list. This is the time at which
+ the task at the head of the delayed list must be removed
+ from the Blocked state. */
+ pxTCB = ( tskTCB * ) listGET_OWNER_OF_HEAD_ENTRY( pxDelayedTaskList );
+ xItemValue = listGET_LIST_ITEM_VALUE( &( pxTCB->xGenericListItem ) );
+
+ if( xConstTickCount < xItemValue )
+ {
+ /* It is not time to unblock this item yet, but the item
+ value is the time at which the task at the head of the
+ blocked list must be removed from the Blocked state -
+ so record the item value in xNextTaskUnblockTime. */
+ xNextTaskUnblockTime = xItemValue;
+ break;
+ }
+
+ /* It is time to remove the item from the Blocked state. */
+ ( void ) uxListRemove( &( pxTCB->xGenericListItem ) );
+
+ /* Is the task waiting on an event also? If so remove it
+ from the event list. */
+ if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
+ {
+ ( void ) uxListRemove( &( pxTCB->xEventListItem ) );
+ }
+
+ /* Place the unblocked task into the appropriate ready
+ list. */
+ prvAddTaskToReadyList( pxTCB );
+
+ /* A task being unblocked cannot cause an immediate context
+ switch if preemption is turned off. */
+ #if ( configUSE_PREEMPTION == 1 )
+ {
+ /* Preemption is on, but a context switch should only
+ be performed if the unblocked task has a priority that
+ is equal to or higher than the currently executing
+ task. */
+ if( pxTCB->uxPriority >= pxCurrentTCB->uxPriority )
+ {
+ xSwitchRequired = pdTRUE;
+ }
+ }
+ #endif /* configUSE_PREEMPTION */
+ }
+ }
+ }
+ }
+
+ /* Tasks of equal priority to the currently running task will share
+ processing time (time slice) if preemption is on, and the application
+ writer has not explicitly turned time slicing off. */
+ #if ( ( configUSE_PREEMPTION == 1 ) && ( configUSE_TIME_SLICING == 1 ) )
+ {
+ if( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ pxCurrentTCB->uxPriority ] ) ) > ( unsigned portBASE_TYPE ) 1 )
+ {
+ xSwitchRequired = pdTRUE;
+ }
+ }
+ #endif /* ( ( configUSE_PREEMPTION == 1 ) && ( configUSE_TIME_SLICING == 1 ) ) */
+
+ #if ( configUSE_TICK_HOOK == 1 )
+ {
+ /* Guard against the tick hook being called when the pended tick
+ count is being unwound (when the scheduler is being unlocked). */
+ if( uxPendedTicks == ( unsigned portBASE_TYPE ) 0U )
+ {
+ vApplicationTickHook();
+ }
+ }
+ #endif /* configUSE_TICK_HOOK */
+ }
+ else
+ {
+ ++uxPendedTicks;
+
+ /* The tick hook gets called at regular intervals, even if the
+ scheduler is locked. */
+ #if ( configUSE_TICK_HOOK == 1 )
+ {
+ vApplicationTickHook();
+ }
+ #endif
+ }
+
+ #if ( configUSE_PREEMPTION == 1 )
+ {
+ if( xYieldPending != pdFALSE )
+ {
+ xSwitchRequired = pdTRUE;
+ }
+ }
+ #endif /* configUSE_PREEMPTION */
+
+ return xSwitchRequired;
+}
+/*-----------------------------------------------------------*/
+
+#if ( configUSE_APPLICATION_TASK_TAG == 1 )
+
+ void vTaskSetApplicationTaskTag( xTaskHandle xTask, pdTASK_HOOK_CODE pxHookFunction )
+ {
+ tskTCB *xTCB;
+
+ /* If xTask is NULL then we are setting our own task hook. */
+ if( xTask == NULL )
+ {
+ xTCB = ( tskTCB * ) pxCurrentTCB;
+ }
+ else
+ {
+ xTCB = ( tskTCB * ) xTask;
+ }
+
+ /* Save the hook function in the TCB. A critical section is required as
+ the value can be accessed from an interrupt. */
+ taskENTER_CRITICAL();
+ xTCB->pxTaskTag = pxHookFunction;
+ taskEXIT_CRITICAL();
+ }
+
+#endif /* configUSE_APPLICATION_TASK_TAG */
+/*-----------------------------------------------------------*/
+
+#if ( configUSE_APPLICATION_TASK_TAG == 1 )
+
+ pdTASK_HOOK_CODE xTaskGetApplicationTaskTag( xTaskHandle xTask )
+ {
+ tskTCB *xTCB;
+ pdTASK_HOOK_CODE xReturn;
+
+ /* If xTask is NULL then we are setting our own task hook. */
+ if( xTask == NULL )
+ {
+ xTCB = ( tskTCB * ) pxCurrentTCB;
+ }
+ else
+ {
+ xTCB = ( tskTCB * ) xTask;
+ }
+
+ /* Save the hook function in the TCB. A critical section is required as
+ the value can be accessed from an interrupt. */
+ taskENTER_CRITICAL();
+ xReturn = xTCB->pxTaskTag;
+ taskEXIT_CRITICAL();
+
+ return xReturn;
+ }
+
+#endif /* configUSE_APPLICATION_TASK_TAG */
+/*-----------------------------------------------------------*/
+
+#if ( configUSE_APPLICATION_TASK_TAG == 1 )
+
+ portBASE_TYPE xTaskCallApplicationTaskHook( xTaskHandle xTask, void *pvParameter )
+ {
+ tskTCB *xTCB;
+ portBASE_TYPE xReturn;
+
+ /* If xTask is NULL then we are calling our own task hook. */
+ if( xTask == NULL )
+ {
+ xTCB = ( tskTCB * ) pxCurrentTCB;
+ }
+ else
+ {
+ xTCB = ( tskTCB * ) xTask;
+ }
+
+ if( xTCB->pxTaskTag != NULL )
+ {
+ xReturn = xTCB->pxTaskTag( pvParameter );
+ }
+ else
+ {
+ xReturn = pdFAIL;
+ }
+
+ return xReturn;
+ }
+
+#endif /* configUSE_APPLICATION_TASK_TAG */
+/*-----------------------------------------------------------*/
+
+void vTaskSwitchContext( void )
+{
+ if( uxSchedulerSuspended != ( unsigned portBASE_TYPE ) pdFALSE )
+ {
+ /* The scheduler is currently suspended - do not allow a context
+ switch. */
+ xYieldPending = pdTRUE;
+ }
+ else
+ {
+ xYieldPending = pdFALSE;
+ traceTASK_SWITCHED_OUT();
+
+ #if ( configGENERATE_RUN_TIME_STATS == 1 )
+ {
+ #ifdef portALT_GET_RUN_TIME_COUNTER_VALUE
+ portALT_GET_RUN_TIME_COUNTER_VALUE( ulTotalRunTime );
+ #else
+ ulTotalRunTime = portGET_RUN_TIME_COUNTER_VALUE();
+ #endif
+
+ /* Add the amount of time the task has been running to the
+ accumulated time so far. The time the task started running was
+ stored in ulTaskSwitchedInTime. Note that there is no overflow
+ protection here so count values are only valid until the timer
+ overflows. The guard against negative values is to protect
+ against suspect run time stat counter implementations - which
+ are provided by the application, not the kernel. */
+ if( ulTotalRunTime > ulTaskSwitchedInTime )
+ {
+ pxCurrentTCB->ulRunTimeCounter += ( ulTotalRunTime - ulTaskSwitchedInTime );
+ }
+ ulTaskSwitchedInTime = ulTotalRunTime;
+ }
+ #endif /* configGENERATE_RUN_TIME_STATS */
+
+ taskFIRST_CHECK_FOR_STACK_OVERFLOW();
+ taskSECOND_CHECK_FOR_STACK_OVERFLOW();
+
+ taskSELECT_HIGHEST_PRIORITY_TASK();
+
+ traceTASK_SWITCHED_IN();
+
+ #if ( configUSE_NEWLIB_REENTRANT == 1 )
+ {
+ /* Switch Newlib's _impure_ptr variable to point to the _reent
+ structure specific to this task. */
+ _impure_ptr = &( pxCurrentTCB->xNewLib_reent );
+ }
+ #endif /* configUSE_NEWLIB_REENTRANT */
+ }
+}
+/*-----------------------------------------------------------*/
+
+void vTaskPlaceOnEventList( xList * const pxEventList, portTickType xTicksToWait )
+{
+portTickType xTimeToWake;
+
+ configASSERT( pxEventList );
+
+ /* THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED OR THE
+ SCHEDULER SUSPENDED. */
+
+ /* Place the event list item of the TCB in the appropriate event list.
+ This is placed in the list in priority order so the highest priority task
+ is the first to be woken by the event. */
+ vListInsert( pxEventList, &( pxCurrentTCB->xEventListItem ) );
+
+ /* We must remove ourselves from the ready list before adding ourselves
+ to the blocked list as the same list item is used for both lists. We have
+ exclusive access to the ready lists as the scheduler is locked. */
+ if( uxListRemove( &( pxCurrentTCB->xGenericListItem ) ) == ( unsigned portBASE_TYPE ) 0 )
+ {
+ /* The current task must be in a ready list, so there is no need to
+ check, and the port reset macro can be called directly. */
+ portRESET_READY_PRIORITY( pxCurrentTCB->uxPriority, uxTopReadyPriority );
+ }
+
+ #if ( INCLUDE_vTaskSuspend == 1 )
+ {
+ if( xTicksToWait == portMAX_DELAY )
+ {
+ /* Add ourselves to the suspended task list instead of a delayed task
+ list to ensure we are not woken by a timing event. We will block
+ indefinitely. */
+ vListInsertEnd( &xSuspendedTaskList, &( pxCurrentTCB->xGenericListItem ) );
+ }
+ else
+ {
+ /* Calculate the time at which the task should be woken if the event does
+ not occur. This may overflow but this doesn't matter. */
+ xTimeToWake = xTickCount + xTicksToWait;
+ prvAddCurrentTaskToDelayedList( xTimeToWake );
+ }
+ }
+ #else /* INCLUDE_vTaskSuspend */
+ {
+ /* Calculate the time at which the task should be woken if the event does
+ not occur. This may overflow but this doesn't matter. */
+ xTimeToWake = xTickCount + xTicksToWait;
+ prvAddCurrentTaskToDelayedList( xTimeToWake );
+ }
+ #endif /* INCLUDE_vTaskSuspend */
+}
+/*-----------------------------------------------------------*/
+
+#if configUSE_TIMERS == 1
+
+ void vTaskPlaceOnEventListRestricted( xList * const pxEventList, portTickType xTicksToWait )
+ {
+ portTickType xTimeToWake;
+
+ configASSERT( pxEventList );
+
+ /* This function should not be called by application code hence the
+ 'Restricted' in its name. It is not part of the public API. It is
+ designed for use by kernel code, and has special calling requirements -
+ it should be called from a critical section. */
+
+
+ /* Place the event list item of the TCB in the appropriate event list.
+ In this case it is assume that this is the only task that is going to
+ be waiting on this event list, so the faster vListInsertEnd() function
+ can be used in place of vListInsert. */
+ vListInsertEnd( pxEventList, &( pxCurrentTCB->xEventListItem ) );
+
+ /* We must remove this task from the ready list before adding it to the
+ blocked list as the same list item is used for both lists. This
+ function is called form a critical section. */
+ if( uxListRemove( &( pxCurrentTCB->xGenericListItem ) ) == ( unsigned portBASE_TYPE ) 0 )
+ {
+ /* The current task must be in a ready list, so there is no need to
+ check, and the port reset macro can be called directly. */
+ portRESET_READY_PRIORITY( pxCurrentTCB->uxPriority, uxTopReadyPriority );
+ }
+
+ /* Calculate the time at which the task should be woken if the event does
+ not occur. This may overflow but this doesn't matter. */
+ xTimeToWake = xTickCount + xTicksToWait;
+
+ traceTASK_DELAY_UNTIL();
+ prvAddCurrentTaskToDelayedList( xTimeToWake );
+ }
+
+#endif /* configUSE_TIMERS */
+/*-----------------------------------------------------------*/
+
+signed portBASE_TYPE xTaskRemoveFromEventList( const xList * const pxEventList )
+{
+tskTCB *pxUnblockedTCB;
+portBASE_TYPE xReturn;
+
+ /* THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED OR THE
+ SCHEDULER SUSPENDED. It can also be called from within an ISR. */
+
+ /* The event list is sorted in priority order, so we can remove the
+ first in the list, remove the TCB from the delayed list, and add
+ it to the ready list.
+
+ If an event is for a queue that is locked then this function will never
+ get called - the lock count on the queue will get modified instead. This
+ means we can always expect exclusive access to the event list here.
+
+ This function assumes that a check has already been made to ensure that
+ pxEventList is not empty. */
+ pxUnblockedTCB = ( tskTCB * ) listGET_OWNER_OF_HEAD_ENTRY( pxEventList );
+ configASSERT( pxUnblockedTCB );
+ ( void ) uxListRemove( &( pxUnblockedTCB->xEventListItem ) );
+
+ if( uxSchedulerSuspended == ( unsigned portBASE_TYPE ) pdFALSE )
+ {
+ ( void ) uxListRemove( &( pxUnblockedTCB->xGenericListItem ) );
+ prvAddTaskToReadyList( pxUnblockedTCB );
+ }
+ else
+ {
+ /* We cannot access the delayed or ready lists, so will hold this
+ task pending until the scheduler is resumed. */
+ vListInsertEnd( &( xPendingReadyList ), &( pxUnblockedTCB->xEventListItem ) );
+ }
+
+ if( pxUnblockedTCB->uxPriority >= pxCurrentTCB->uxPriority )
+ {
+ /* Return true if the task removed from the event list has
+ a higher priority than the calling task. This allows
+ the calling task to know if it should force a context
+ switch now. */
+ xReturn = pdTRUE;
+
+ /* Mark that a yield is pending in case the user is not using the
+ "xHigherPriorityTaskWoken" parameter to an ISR safe FreeRTOS function. */
+ xYieldPending = pdTRUE;
+ }
+ else
+ {
+ xReturn = pdFALSE;
+ }
+
+ return xReturn;
+}
+/*-----------------------------------------------------------*/
+
+void vTaskSetTimeOutState( xTimeOutType * const pxTimeOut )
+{
+ configASSERT( pxTimeOut );
+ pxTimeOut->xOverflowCount = xNumOfOverflows;
+ pxTimeOut->xTimeOnEntering = xTickCount;
+}
+/*-----------------------------------------------------------*/
+
+portBASE_TYPE xTaskCheckForTimeOut( xTimeOutType * const pxTimeOut, portTickType * const pxTicksToWait )
+{
+portBASE_TYPE xReturn;
+
+ configASSERT( pxTimeOut );
+ configASSERT( pxTicksToWait );
+
+ taskENTER_CRITICAL();
+ {
+ /* Minor optimisation. The tick count cannot change in this block. */
+ const portTickType xConstTickCount = xTickCount;
+
+ #if ( INCLUDE_vTaskSuspend == 1 )
+ /* If INCLUDE_vTaskSuspend is set to 1 and the block time specified is
+ the maximum block time then the task should block indefinitely, and
+ therefore never time out. */
+ if( *pxTicksToWait == portMAX_DELAY )
+ {
+ xReturn = pdFALSE;
+ }
+ else /* We are not blocking indefinitely, perform the checks below. */
+ #endif
+
+ if( ( xNumOfOverflows != pxTimeOut->xOverflowCount ) && ( xConstTickCount >= pxTimeOut->xTimeOnEntering ) ) /*lint !e525 Indentation preferred as is to make code within pre-processor directives clearer. */
+ {
+ /* The tick count is greater than the time at which vTaskSetTimeout()
+ was called, but has also overflowed since vTaskSetTimeOut() was called.
+ It must have wrapped all the way around and gone past us again. This
+ passed since vTaskSetTimeout() was called. */
+ xReturn = pdTRUE;
+ }
+ else if( ( xConstTickCount - pxTimeOut->xTimeOnEntering ) < *pxTicksToWait )
+ {
+ /* Not a genuine timeout. Adjust parameters for time remaining. */
+ *pxTicksToWait -= ( xConstTickCount - pxTimeOut->xTimeOnEntering );
+ vTaskSetTimeOutState( pxTimeOut );
+ xReturn = pdFALSE;
+ }
+ else
+ {
+ xReturn = pdTRUE;
+ }
+ }
+ taskEXIT_CRITICAL();
+
+ return xReturn;
+}
+/*-----------------------------------------------------------*/
+
+void vTaskMissedYield( void )
+{
+ xYieldPending = pdTRUE;
+}
+/*-----------------------------------------------------------*/
+
+#if ( configUSE_TRACE_FACILITY == 1 )
+
+ unsigned portBASE_TYPE uxTaskGetTaskNumber( xTaskHandle xTask )
+ {
+ unsigned portBASE_TYPE uxReturn;
+ tskTCB *pxTCB;
+
+ if( xTask != NULL )
+ {
+ pxTCB = ( tskTCB * ) xTask;
+ uxReturn = pxTCB->uxTaskNumber;
+ }
+ else
+ {
+ uxReturn = 0U;
+ }
+
+ return uxReturn;
+ }
+
+#endif /* configUSE_TRACE_FACILITY */
+/*-----------------------------------------------------------*/
+
+#if ( configUSE_TRACE_FACILITY == 1 )
+
+ void vTaskSetTaskNumber( xTaskHandle xTask, unsigned portBASE_TYPE uxHandle )
+ {
+ tskTCB *pxTCB;
+
+ if( xTask != NULL )
+ {
+ pxTCB = ( tskTCB * ) xTask;
+ pxTCB->uxTaskNumber = uxHandle;
+ }
+ }
+
+#endif /* configUSE_TRACE_FACILITY */
+
+/*
+ * -----------------------------------------------------------
+ * The Idle task.
+ * ----------------------------------------------------------
+ *
+ * The portTASK_FUNCTION() macro is used to allow port/compiler specific
+ * language extensions. The equivalent prototype for this function is:
+ *
+ * void prvIdleTask( void *pvParameters );
+ *
+ */
+static portTASK_FUNCTION( prvIdleTask, pvParameters )
+{
+ /* Stop warnings. */
+ ( void ) pvParameters;
+
+ for( ;; )
+ {
+ /* See if any tasks have been deleted. */
+ prvCheckTasksWaitingTermination();
+
+ #if ( configUSE_PREEMPTION == 0 )
+ {
+ /* If we are not using preemption we keep forcing a task switch to
+ see if any other task has become available. If we are using
+ preemption we don't need to do this as any task becoming available
+ will automatically get the processor anyway. */
+ taskYIELD();
+ }
+ #endif /* configUSE_PREEMPTION */
+
+ #if ( ( configUSE_PREEMPTION == 1 ) && ( configIDLE_SHOULD_YIELD == 1 ) )
+ {
+ /* When using preemption tasks of equal priority will be
+ timesliced. If a task that is sharing the idle priority is ready
+ to run then the idle task should yield before the end of the
+ timeslice.
+
+ A critical region is not required here as we are just reading from
+ the list, and an occasional incorrect value will not matter. If
+ the ready list at the idle priority contains more than one task
+ then a task other than the idle task is ready to execute. */
+ if( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ tskIDLE_PRIORITY ] ) ) > ( unsigned portBASE_TYPE ) 1 )
+ {
+ taskYIELD();
+ }
+ }
+ #endif /* ( ( configUSE_PREEMPTION == 1 ) && ( configIDLE_SHOULD_YIELD == 1 ) ) */
+
+ #if ( configUSE_IDLE_HOOK == 1 )
+ {
+ extern void vApplicationIdleHook( void );
+
+ /* Call the user defined function from within the idle task. This
+ allows the application designer to add background functionality
+ without the overhead of a separate task.
+ NOTE: vApplicationIdleHook() MUST NOT, UNDER ANY CIRCUMSTANCES,
+ CALL A FUNCTION THAT MIGHT BLOCK. */
+ vApplicationIdleHook();
+ }
+ #endif /* configUSE_IDLE_HOOK */
+
+ /* This conditional compilation should use inequality to 0, not equality
+ to 1. This is to ensure portSUPPRESS_TICKS_AND_SLEEP() is called when
+ user defined low power mode implementations require
+ configUSE_TICKLESS_IDLE to be set to a value other than 1. */
+ #if ( configUSE_TICKLESS_IDLE != 0 )
+ {
+ portTickType xExpectedIdleTime;
+
+ /* It is not desirable to suspend then resume the scheduler on
+ each iteration of the idle task. Therefore, a preliminary
+ test of the expected idle time is performed without the
+ scheduler suspended. The result here is not necessarily
+ valid. */
+ xExpectedIdleTime = prvGetExpectedIdleTime();
+
+ if( xExpectedIdleTime >= configEXPECTED_IDLE_TIME_BEFORE_SLEEP )
+ {
+ vTaskSuspendAll();
+ {
+ /* Now the scheduler is suspended, the expected idle
+ time can be sampled again, and this time its value can
+ be used. */
+ configASSERT( xNextTaskUnblockTime >= xTickCount );
+ xExpectedIdleTime = prvGetExpectedIdleTime();
+
+ if( xExpectedIdleTime >= configEXPECTED_IDLE_TIME_BEFORE_SLEEP )
+ {
+ traceLOW_POWER_IDLE_BEGIN();
+ portSUPPRESS_TICKS_AND_SLEEP( xExpectedIdleTime );
+ traceLOW_POWER_IDLE_END();
+ }
+ }
+ ( void ) xTaskResumeAll();
+ }
+ }
+ #endif /* configUSE_TICKLESS_IDLE */
+ }
+}
+/*-----------------------------------------------------------*/
+
+#if configUSE_TICKLESS_IDLE != 0
+
+ eSleepModeStatus eTaskConfirmSleepModeStatus( void )
+ {
+ eSleepModeStatus eReturn = eStandardSleep;
+
+ if( listCURRENT_LIST_LENGTH( &xPendingReadyList ) != 0 )
+ {
+ /* A task was made ready while the scheduler was suspended. */
+ eReturn = eAbortSleep;
+ }
+ else if( xYieldPending != pdFALSE )
+ {
+ /* A yield was pended while the scheduler was suspended. */
+ eReturn = eAbortSleep;
+ }
+ else
+ {
+ #if configUSE_TIMERS == 0
+ {
+ /* The idle task exists in addition to the application tasks. */
+ const unsigned portBASE_TYPE uxNonApplicationTasks = 1;
+
+ /* If timers are not being used and all the tasks are in the
+ suspended list (which might mean they have an infinite block
+ time rather than actually being suspended) then it is safe to
+ turn all clocks off and just wait for external interrupts. */
+ if( listCURRENT_LIST_LENGTH( &xSuspendedTaskList ) == ( uxCurrentNumberOfTasks - uxNonApplicationTasks ) )
+ {
+ eReturn = eNoTasksWaitingTimeout;
+ }
+ }
+ #endif /* configUSE_TIMERS */
+ }
+
+ return eReturn;
+ }
+#endif /* configUSE_TICKLESS_IDLE */
+/*-----------------------------------------------------------*/
+
+static void prvInitialiseTCBVariables( tskTCB *pxTCB, const signed char * const pcName, unsigned portBASE_TYPE uxPriority, const xMemoryRegion * const xRegions, unsigned short usStackDepth )
+{
+unsigned portBASE_TYPE x;
+
+ /* Store the task name in the TCB. */
+ for( x = ( unsigned portBASE_TYPE ) 0; x < ( unsigned portBASE_TYPE ) configMAX_TASK_NAME_LEN; x++ )
+ {
+ pxTCB->pcTaskName[ x ] = pcName[ x ];
+
+ /* Don't copy all configMAX_TASK_NAME_LEN if the string is shorter than
+ configMAX_TASK_NAME_LEN characters just in case the memory after the
+ string is not accessible (extremely unlikely). */
+ if( pcName[ x ] == 0x00 )
+ {
+ break;
+ }
+ }
+
+ /* Ensure the name string is terminated in the case that the string length
+ was greater or equal to configMAX_TASK_NAME_LEN. */
+ pxTCB->pcTaskName[ configMAX_TASK_NAME_LEN - 1 ] = ( signed char ) '\0';
+
+ /* This is used as an array index so must ensure it's not too large. First
+ remove the privilege bit if one is present. */
+ if( uxPriority >= ( unsigned portBASE_TYPE ) configMAX_PRIORITIES )
+ {
+ uxPriority = ( unsigned portBASE_TYPE ) configMAX_PRIORITIES - ( unsigned portBASE_TYPE ) 1U;
+ }
+
+ pxTCB->uxPriority = uxPriority;
+ #if ( configUSE_MUTEXES == 1 )
+ {
+ pxTCB->uxBasePriority = uxPriority;
+ }
+ #endif /* configUSE_MUTEXES */
+
+ vListInitialiseItem( &( pxTCB->xGenericListItem ) );
+ vListInitialiseItem( &( pxTCB->xEventListItem ) );
+
+ /* Set the pxTCB as a link back from the xListItem. This is so we can get
+ back to the containing TCB from a generic item in a list. */
+ listSET_LIST_ITEM_OWNER( &( pxTCB->xGenericListItem ), pxTCB );
+
+ /* Event lists are always in priority order. */
+ listSET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ), ( portTickType ) configMAX_PRIORITIES - ( portTickType ) uxPriority ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
+ listSET_LIST_ITEM_OWNER( &( pxTCB->xEventListItem ), pxTCB );
+
+ #if ( portCRITICAL_NESTING_IN_TCB == 1 )
+ {
+ pxTCB->uxCriticalNesting = ( unsigned portBASE_TYPE ) 0U;
+ }
+ #endif /* portCRITICAL_NESTING_IN_TCB */
+
+ #if ( configUSE_APPLICATION_TASK_TAG == 1 )
+ {
+ pxTCB->pxTaskTag = NULL;
+ }
+ #endif /* configUSE_APPLICATION_TASK_TAG */
+
+ #if ( configGENERATE_RUN_TIME_STATS == 1 )
+ {
+ pxTCB->ulRunTimeCounter = 0UL;
+ }
+ #endif /* configGENERATE_RUN_TIME_STATS */
+
+ #if ( portUSING_MPU_WRAPPERS == 1 )
+ {
+ vPortStoreTaskMPUSettings( &( pxTCB->xMPUSettings ), xRegions, pxTCB->pxStack, usStackDepth );
+ }
+ #else /* portUSING_MPU_WRAPPERS */
+ {
+ ( void ) xRegions;
+ ( void ) usStackDepth;
+ }
+ #endif /* portUSING_MPU_WRAPPERS */
+
+ #if ( configUSE_NEWLIB_REENTRANT == 1 )
+ {
+ /* Initialise this task's Newlib reent structure. */
+ _REENT_INIT_PTR( ( &( pxTCB->xNewLib_reent ) ) );
+ }
+ #endif /* configUSE_NEWLIB_REENTRANT */
+}
+/*-----------------------------------------------------------*/
+
+#if ( portUSING_MPU_WRAPPERS == 1 )
+
+ void vTaskAllocateMPURegions( xTaskHandle xTaskToModify, const xMemoryRegion * const xRegions )
+ {
+ tskTCB *pxTCB;
+
+ /* If null is passed in here then we are deleting ourselves. */
+ pxTCB = prvGetTCBFromHandle( xTaskToModify );
+
+ vPortStoreTaskMPUSettings( &( pxTCB->xMPUSettings ), xRegions, NULL, 0 );
+ }
+
+#endif /* portUSING_MPU_WRAPPERS */
+/*-----------------------------------------------------------*/
+
+static void prvInitialiseTaskLists( void )
+{
+unsigned portBASE_TYPE uxPriority;
+
+ for( uxPriority = ( unsigned portBASE_TYPE ) 0U; uxPriority < ( unsigned portBASE_TYPE ) configMAX_PRIORITIES; uxPriority++ )
+ {
+ vListInitialise( &( pxReadyTasksLists[ uxPriority ] ) );
+ }
+
+ vListInitialise( &xDelayedTaskList1 );
+ vListInitialise( &xDelayedTaskList2 );
+ vListInitialise( &xPendingReadyList );
+
+ #if ( INCLUDE_vTaskDelete == 1 )
+ {
+ vListInitialise( &xTasksWaitingTermination );
+ }
+ #endif /* INCLUDE_vTaskDelete */
+
+ #if ( INCLUDE_vTaskSuspend == 1 )
+ {
+ vListInitialise( &xSuspendedTaskList );
+ }
+ #endif /* INCLUDE_vTaskSuspend */
+
+ /* Start with pxDelayedTaskList using list1 and the pxOverflowDelayedTaskList
+ using list2. */
+ pxDelayedTaskList = &xDelayedTaskList1;
+ pxOverflowDelayedTaskList = &xDelayedTaskList2;
+}
+/*-----------------------------------------------------------*/
+
+static void prvCheckTasksWaitingTermination( void )
+{
+ #if ( INCLUDE_vTaskDelete == 1 )
+ {
+ portBASE_TYPE xListIsEmpty;
+
+ /* ucTasksDeleted is used to prevent vTaskSuspendAll() being called
+ too often in the idle task. */
+ while( uxTasksDeleted > ( unsigned portBASE_TYPE ) 0U )
+ {
+ vTaskSuspendAll();
+ xListIsEmpty = listLIST_IS_EMPTY( &xTasksWaitingTermination );
+ ( void ) xTaskResumeAll();
+
+ if( xListIsEmpty == pdFALSE )
+ {
+ tskTCB *pxTCB;
+
+ taskENTER_CRITICAL();
+ {
+ pxTCB = ( tskTCB * ) listGET_OWNER_OF_HEAD_ENTRY( ( &xTasksWaitingTermination ) );
+ ( void ) uxListRemove( &( pxTCB->xGenericListItem ) );
+ --uxCurrentNumberOfTasks;
+ --uxTasksDeleted;
+ }
+ taskEXIT_CRITICAL();
+
+ prvDeleteTCB( pxTCB );
+ }
+ }
+ }
+ #endif /* vTaskDelete */
+}
+/*-----------------------------------------------------------*/
+
+static void prvAddCurrentTaskToDelayedList( portTickType xTimeToWake )
+{
+ /* The list item will be inserted in wake time order. */
+ listSET_LIST_ITEM_VALUE( &( pxCurrentTCB->xGenericListItem ), xTimeToWake );
+
+ if( xTimeToWake < xTickCount )
+ {
+ /* Wake time has overflowed. Place this item in the overflow list. */
+ vListInsert( pxOverflowDelayedTaskList, &( pxCurrentTCB->xGenericListItem ) );
+ }
+ else
+ {
+ /* The wake time has not overflowed, so we can use the current block list. */
+ vListInsert( pxDelayedTaskList, &( pxCurrentTCB->xGenericListItem ) );
+
+ /* If the task entering the blocked state was placed at the head of the
+ list of blocked tasks then xNextTaskUnblockTime needs to be updated
+ too. */
+ if( xTimeToWake < xNextTaskUnblockTime )
+ {
+ xNextTaskUnblockTime = xTimeToWake;
+ }
+ }
+}
+/*-----------------------------------------------------------*/
+
+static tskTCB *prvAllocateTCBAndStack( unsigned short usStackDepth, portSTACK_TYPE *puxStackBuffer )
+{
+tskTCB *pxNewTCB;
+
+ /* Allocate space for the TCB. Where the memory comes from depends on
+ the implementation of the port malloc function. */
+ pxNewTCB = ( tskTCB * ) pvPortMalloc( sizeof( tskTCB ) );
+
+ if( pxNewTCB != NULL )
+ {
+ /* Allocate space for the stack used by the task being created.
+ The base of the stack memory stored in the TCB so the task can
+ be deleted later if required. */
+ pxNewTCB->pxStack = ( portSTACK_TYPE * ) pvPortMallocAligned( ( ( ( size_t ) usStackDepth ) * sizeof( portSTACK_TYPE ) ), puxStackBuffer ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
+
+ if( pxNewTCB->pxStack == NULL )
+ {
+ /* Could not allocate the stack. Delete the allocated TCB. */
+ vPortFree( pxNewTCB );
+ pxNewTCB = NULL;
+ }
+ else
+ {
+ /* Just to help debugging. */
+ ( void ) memset( pxNewTCB->pxStack, ( int ) tskSTACK_FILL_BYTE, ( size_t ) usStackDepth * sizeof( portSTACK_TYPE ) );
+ }
+ }
+
+ return pxNewTCB;
+}
+/*-----------------------------------------------------------*/
+
+#if ( configUSE_TRACE_FACILITY == 1 )
+
+ static unsigned portBASE_TYPE prvListTaskWithinSingleList( xTaskStatusType *pxTaskStatusArray, xList *pxList, eTaskState eState )
+ {
+ volatile tskTCB *pxNextTCB, *pxFirstTCB;
+ unsigned portBASE_TYPE uxTask = 0;
+
+ if( listCURRENT_LIST_LENGTH( pxList ) > ( unsigned portBASE_TYPE ) 0 )
+ {
+ listGET_OWNER_OF_NEXT_ENTRY( pxFirstTCB, pxList );
+
+ /* Populate an xTaskStatusType structure within the
+ pxTaskStatusArray array for each task that is referenced from
+ pxList. See the definition of xTaskStatusType in task.h for the
+ meaning of each xTaskStatusType structure member. */
+ do
+ {
+ listGET_OWNER_OF_NEXT_ENTRY( pxNextTCB, pxList );
+
+ pxTaskStatusArray[ uxTask ].xHandle = ( xTaskHandle ) pxNextTCB;
+ pxTaskStatusArray[ uxTask ].pcTaskName = ( const signed char * ) &( pxNextTCB->pcTaskName [ 0 ] );
+ pxTaskStatusArray[ uxTask ].xTaskNumber = pxNextTCB->uxTCBNumber;
+ pxTaskStatusArray[ uxTask ].eCurrentState = eState;
+ pxTaskStatusArray[ uxTask ].uxCurrentPriority = pxNextTCB->uxPriority;
+
+ #if ( configUSE_MUTEXES == 1 )
+ {
+ pxTaskStatusArray[ uxTask ].uxBasePriority = pxNextTCB->uxBasePriority;
+ }
+ #else
+ {
+ pxTaskStatusArray[ uxTask ].uxBasePriority = 0;
+ }
+ #endif
+
+ #if ( configGENERATE_RUN_TIME_STATS == 1 )
+ {
+ pxTaskStatusArray[ uxTask ].ulRunTimeCounter = pxNextTCB->ulRunTimeCounter;
+ }
+ #else
+ {
+ pxTaskStatusArray[ uxTask ].ulRunTimeCounter = 0;
+ }
+ #endif
+
+ #if ( portSTACK_GROWTH > 0 )
+ {
+ pxTaskStatusArray[ uxTask ].usStackHighWaterMark = prvTaskCheckFreeStackSpace( ( unsigned char * ) pxNextTCB->pxEndOfStack );
+ }
+ #else
+ {
+ pxTaskStatusArray[ uxTask ].usStackHighWaterMark = prvTaskCheckFreeStackSpace( ( unsigned char * ) pxNextTCB->pxStack );
+ }
+ #endif
+
+ uxTask++;
+
+ } while( pxNextTCB != pxFirstTCB );
+ }
+
+ return uxTask;
+ }
+
+#endif /* configUSE_TRACE_FACILITY */
+/*-----------------------------------------------------------*/
+
+#if ( ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark == 1 ) )
+
+ static unsigned short prvTaskCheckFreeStackSpace( const unsigned char * pucStackByte )
+ {
+ unsigned short usCount = 0U;
+
+ while( *pucStackByte == tskSTACK_FILL_BYTE )
+ {
+ pucStackByte -= portSTACK_GROWTH;
+ usCount++;
+ }
+
+ usCount /= sizeof( portSTACK_TYPE );
+
+ return usCount;
+ }
+
+#endif /* ( ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark == 1 ) ) */
+/*-----------------------------------------------------------*/
+
+#if ( INCLUDE_uxTaskGetStackHighWaterMark == 1 )
+
+ unsigned portBASE_TYPE uxTaskGetStackHighWaterMark( xTaskHandle xTask )
+ {
+ tskTCB *pxTCB;
+ unsigned char *pcEndOfStack;
+ unsigned portBASE_TYPE uxReturn;
+
+ pxTCB = prvGetTCBFromHandle( xTask );
+
+ #if portSTACK_GROWTH < 0
+ {
+ pcEndOfStack = ( unsigned char * ) pxTCB->pxStack;
+ }
+ #else
+ {
+ pcEndOfStack = ( unsigned char * ) pxTCB->pxEndOfStack;
+ }
+ #endif
+
+ uxReturn = ( unsigned portBASE_TYPE ) prvTaskCheckFreeStackSpace( pcEndOfStack );
+
+ return uxReturn;
+ }
+
+#endif /* INCLUDE_uxTaskGetStackHighWaterMark */
+/*-----------------------------------------------------------*/
+
+#if ( INCLUDE_vTaskDelete == 1 )
+
+ static void prvDeleteTCB( tskTCB *pxTCB )
+ {
+ /* This call is required specifically for the TriCore port. It must be
+ above the vPortFree() calls. The call is also used by ports/demos that
+ want to allocate and clean RAM statically. */
+ portCLEAN_UP_TCB( pxTCB );
+
+ /* Free up the memory allocated by the scheduler for the task. It is up to
+ the task to free any memory allocated at the application level. */
+ vPortFreeAligned( pxTCB->pxStack );
+ vPortFree( pxTCB );
+ }
+
+#endif /* INCLUDE_vTaskDelete */
+/*-----------------------------------------------------------*/
+
+#if ( ( INCLUDE_xTaskGetCurrentTaskHandle == 1 ) || ( configUSE_MUTEXES == 1 ) )
+
+ xTaskHandle xTaskGetCurrentTaskHandle( void )
+ {
+ xTaskHandle xReturn;
+
+ /* A critical section is not required as this is not called from
+ an interrupt and the current TCB will always be the same for any
+ individual execution thread. */
+ xReturn = pxCurrentTCB;
+
+ return xReturn;
+ }
+
+#endif /* ( ( INCLUDE_xTaskGetCurrentTaskHandle == 1 ) || ( configUSE_MUTEXES == 1 ) ) */
+/*-----------------------------------------------------------*/
+
+#if ( ( INCLUDE_xTaskGetSchedulerState == 1 ) || ( configUSE_TIMERS == 1 ) )
+
+ portBASE_TYPE xTaskGetSchedulerState( void )
+ {
+ portBASE_TYPE xReturn;
+
+ if( xSchedulerRunning == pdFALSE )
+ {
+ xReturn = taskSCHEDULER_NOT_STARTED;
+ }
+ else
+ {
+ if( uxSchedulerSuspended == ( unsigned portBASE_TYPE ) pdFALSE )
+ {
+ xReturn = taskSCHEDULER_RUNNING;
+ }
+ else
+ {
+ xReturn = taskSCHEDULER_SUSPENDED;
+ }
+ }
+
+ return xReturn;
+ }
+
+#endif /* ( ( INCLUDE_xTaskGetSchedulerState == 1 ) || ( configUSE_TIMERS == 1 ) ) */
+/*-----------------------------------------------------------*/
+
+#if ( configUSE_MUTEXES == 1 )
+
+ void vTaskPriorityInherit( xTaskHandle const pxMutexHolder )
+ {
+ tskTCB * const pxTCB = ( tskTCB * ) pxMutexHolder;
+
+ /* If the mutex was given back by an interrupt while the queue was
+ locked then the mutex holder might now be NULL. */
+ if( pxMutexHolder != NULL )
+ {
+ if( pxTCB->uxPriority < pxCurrentTCB->uxPriority )
+ {
+ /* Adjust the mutex holder state to account for its new priority. */
+ listSET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ), ( portTickType ) configMAX_PRIORITIES - ( portTickType ) pxCurrentTCB->uxPriority ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
+
+ /* If the task being modified is in the ready state it will need to
+ be moved into a new list. */
+ if( listIS_CONTAINED_WITHIN( &( pxReadyTasksLists[ pxTCB->uxPriority ] ), &( pxTCB->xGenericListItem ) ) != pdFALSE )
+ {
+ if( uxListRemove( &( pxTCB->xGenericListItem ) ) == ( unsigned portBASE_TYPE ) 0 )
+ {
+ taskRESET_READY_PRIORITY( pxTCB->uxPriority );
+ }
+
+ /* Inherit the priority before being moved into the new list. */
+ pxTCB->uxPriority = pxCurrentTCB->uxPriority;
+ prvAddTaskToReadyList( pxTCB );
+ }
+ else
+ {
+ /* Just inherit the priority. */
+ pxTCB->uxPriority = pxCurrentTCB->uxPriority;
+ }
+
+ traceTASK_PRIORITY_INHERIT( pxTCB, pxCurrentTCB->uxPriority );
+ }
+ }
+ }
+
+#endif /* configUSE_MUTEXES */
+/*-----------------------------------------------------------*/
+
+#if ( configUSE_MUTEXES == 1 )
+
+ void vTaskPriorityDisinherit( xTaskHandle const pxMutexHolder )
+ {
+ tskTCB * const pxTCB = ( tskTCB * ) pxMutexHolder;
+
+ if( pxMutexHolder != NULL )
+ {
+ if( pxTCB->uxPriority != pxTCB->uxBasePriority )
+ {
+ /* We must be the running task to be able to give the mutex back.
+ Remove ourselves from the ready list we currently appear in. */
+ if( uxListRemove( &( pxTCB->xGenericListItem ) ) == ( unsigned portBASE_TYPE ) 0 )
+ {
+ taskRESET_READY_PRIORITY( pxTCB->uxPriority );
+ }
+
+ /* Disinherit the priority before adding the task into the new
+ ready list. */
+ traceTASK_PRIORITY_DISINHERIT( pxTCB, pxTCB->uxBasePriority );
+ pxTCB->uxPriority = pxTCB->uxBasePriority;
+ listSET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ), ( portTickType ) configMAX_PRIORITIES - ( portTickType ) pxTCB->uxPriority ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
+ prvAddTaskToReadyList( pxTCB );
+ }
+ }
+ }
+
+#endif /* configUSE_MUTEXES */
+/*-----------------------------------------------------------*/
+
+#if ( portCRITICAL_NESTING_IN_TCB == 1 )
+
+ void vTaskEnterCritical( void )
+ {
+ portDISABLE_INTERRUPTS();
+
+ if( xSchedulerRunning != pdFALSE )
+ {
+ ( pxCurrentTCB->uxCriticalNesting )++;
+ }
+ }
+
+#endif /* portCRITICAL_NESTING_IN_TCB */
+/*-----------------------------------------------------------*/
+
+#if ( portCRITICAL_NESTING_IN_TCB == 1 )
+
+ void vTaskExitCritical( void )
+ {
+ if( xSchedulerRunning != pdFALSE )
+ {
+ if( pxCurrentTCB->uxCriticalNesting > 0U )
+ {
+ ( pxCurrentTCB->uxCriticalNesting )--;
+
+ if( pxCurrentTCB->uxCriticalNesting == 0U )
+ {
+ portENABLE_INTERRUPTS();
+ }
+ }
+ }
+ }
+
+#endif /* portCRITICAL_NESTING_IN_TCB */
+/*-----------------------------------------------------------*/
+
+#if ( ( configUSE_TRACE_FACILITY == 1 ) && ( configUSE_STATS_FORMATTING_FUNCTIONS == 1 ) )
+
+ void vTaskList( signed char *pcWriteBuffer )
+ {
+ xTaskStatusType *pxTaskStatusArray;
+ volatile unsigned portBASE_TYPE uxArraySize, x;
+ char cStatus;
+
+ /*
+ * PLEASE NOTE:
+ *
+ * This function is provided for convenience only, and is used by many
+ * of the demo applications. Do not consider it to be part of the
+ * scheduler.
+ *
+ * vTaskList() calls uxTaskGetSystemState(), then formats part of the
+ * uxTaskGetSystemState() output into a human readable table that
+ * displays task names, states and stack usage.
+ *
+ * vTaskList() has a dependency on the sprintf() C library function that
+ * might bloat the code size, use a lot of stack, and provide different
+ * results on different platforms. An alternative, tiny, third party,
+ * and limited functionality implementation of sprintf() is provided in
+ * many of the FreeRTOS/Demo sub-directories in a file called
+ * printf-stdarg.c (note printf-stdarg.c does not provide a full
+ * snprintf() implementation!).
+ *
+ * It is recommended that production systems call uxTaskGetSystemState()
+ * directly to get access to raw stats data, rather than indirectly
+ * through a call to vTaskList().
+ */
+
+
+ /* Make sure the write buffer does not contain a string. */
+ *pcWriteBuffer = 0x00;
+
+ /* Take a snapshot of the number of tasks in case it changes while this
+ function is executing. */
+ uxArraySize = uxCurrentNumberOfTasks;
+
+ /* Allocate an array index for each task. */
+ pxTaskStatusArray = pvPortMalloc( uxCurrentNumberOfTasks * sizeof( xTaskStatusType ) );
+
+ if( pxTaskStatusArray != NULL )
+ {
+ /* Generate the (binary) data. */
+ uxArraySize = uxTaskGetSystemState( pxTaskStatusArray, uxArraySize, NULL );
+
+ /* Create a human readable table from the binary data. */
+ for( x = 0; x < uxArraySize; x++ )
+ {
+ switch( pxTaskStatusArray[ x ].eCurrentState )
+ {
+ case eReady: cStatus = tskREADY_CHAR;
+ break;
+
+ case eBlocked: cStatus = tskBLOCKED_CHAR;
+ break;
+
+ case eSuspended: cStatus = tskSUSPENDED_CHAR;
+ break;
+
+ case eDeleted: cStatus = tskDELETED_CHAR;
+ break;
+
+ default: /* Should not get here, but it is included
+ to prevent static checking errors. */
+ cStatus = 0x00;
+ break;
+ }
+
+ sprintf( ( char * ) pcWriteBuffer, ( char * ) "%s\t\t%c\t%u\t%u\t%u\r\n", pxTaskStatusArray[ x ].pcTaskName, cStatus, ( unsigned int ) pxTaskStatusArray[ x ].uxCurrentPriority, ( unsigned int ) pxTaskStatusArray[ x ].usStackHighWaterMark, ( unsigned int ) pxTaskStatusArray[ x ].xTaskNumber );
+ pcWriteBuffer += strlen( ( char * ) pcWriteBuffer );
+ }
+
+ /* Free the array again. */
+ vPortFree( pxTaskStatusArray );
+ }
+ }
+
+#endif /* configUSE_TRACE_FACILITY */
+/*----------------------------------------------------------*/
+
+#if ( ( configGENERATE_RUN_TIME_STATS == 1 ) && ( configUSE_STATS_FORMATTING_FUNCTIONS == 1 ) )
+
+ void vTaskGetRunTimeStats( signed char *pcWriteBuffer )
+ {
+ xTaskStatusType *pxTaskStatusArray;
+ volatile unsigned portBASE_TYPE uxArraySize, x;
+ unsigned long ulTotalTime, ulStatsAsPercentage;
+
+ /*
+ * PLEASE NOTE:
+ *
+ * This function is provided for convenience only, and is used by many
+ * of the demo applications. Do not consider it to be part of the
+ * scheduler.
+ *
+ * vTaskGetRunTimeStats() calls uxTaskGetSystemState(), then formats part
+ * of the uxTaskGetSystemState() output into a human readable table that
+ * displays the amount of time each task has spent in the Running state
+ * in both absolute and percentage terms.
+ *
+ * vTaskGetRunTimeStats() has a dependency on the sprintf() C library
+ * function that might bloat the code size, use a lot of stack, and
+ * provide different results on different platforms. An alternative,
+ * tiny, third party, and limited functionality implementation of
+ * sprintf() is provided in many of the FreeRTOS/Demo sub-directories in
+ * a file called printf-stdarg.c (note printf-stdarg.c does not provide
+ * a full snprintf() implementation!).
+ *
+ * It is recommended that production systems call uxTaskGetSystemState()
+ * directly to get access to raw stats data, rather than indirectly
+ * through a call to vTaskGetRunTimeStats().
+ */
+
+ /* Make sure the write buffer does not contain a string. */
+ *pcWriteBuffer = 0x00;
+
+ /* Take a snapshot of the number of tasks in case it changes while this
+ function is executing. */
+ uxArraySize = uxCurrentNumberOfTasks;
+
+ /* Allocate an array index for each task. */
+ pxTaskStatusArray = pvPortMalloc( uxCurrentNumberOfTasks * sizeof( xTaskStatusType ) );
+
+ if( pxTaskStatusArray != NULL )
+ {
+ /* Generate the (binary) data. */
+ uxArraySize = uxTaskGetSystemState( pxTaskStatusArray, uxArraySize, &ulTotalTime );
+
+ /* For percentage calculations. */
+ ulTotalTime /= 100UL;
+
+ /* Avoid divide by zero errors. */
+ if( ulTotalTime > 0 )
+ {
+ /* Create a human readable table from the binary data. */
+ for( x = 0; x < uxArraySize; x++ )
+ {
+ /* What percentage of the total run time has the task used?
+ This will always be rounded down to the nearest integer.
+ ulTotalRunTimeDiv100 has already been divided by 100. */
+ ulStatsAsPercentage = pxTaskStatusArray[ x ].ulRunTimeCounter / ulTotalTime;
+
+ if( ulStatsAsPercentage > 0UL )
+ {
+ #ifdef portLU_PRINTF_SPECIFIER_REQUIRED
+ {
+ sprintf( ( char * ) pcWriteBuffer, ( char * ) "%s\t\t%lu\t\t%lu%%\r\n", pxTaskStatusArray[ x ].pcTaskName, pxTaskStatusArray[ x ].ulRunTimeCounter, ulStatsAsPercentage );
+ }
+ #else
+ {
+ /* sizeof( int ) == sizeof( long ) so a smaller
+ printf() library can be used. */
+ sprintf( ( char * ) pcWriteBuffer, ( char * ) "%s\t\t%u\t\t%u%%\r\n", pxTaskStatusArray[ x ].pcTaskName, ( unsigned int ) pxTaskStatusArray[ x ].ulRunTimeCounter, ( unsigned int ) ulStatsAsPercentage );
+ }
+ #endif
+ }
+ else
+ {
+ /* If the percentage is zero here then the task has
+ consumed less than 1% of the total run time. */
+ #ifdef portLU_PRINTF_SPECIFIER_REQUIRED
+ {
+ sprintf( ( char * ) pcWriteBuffer, ( char * ) "%s\t\t%lu\t\t<1%%\r\n", pxTaskStatusArray[ x ].pcTaskName, pxTaskStatusArray[ x ].ulRunTimeCounter );
+ }
+ #else
+ {
+ /* sizeof( int ) == sizeof( long ) so a smaller
+ printf() library can be used. */
+ sprintf( ( char * ) pcWriteBuffer, ( char * ) "%s\t\t%u\t\t<1%%\r\n", pxTaskStatusArray[ x ].pcTaskName, ( unsigned int ) pxTaskStatusArray[ x ].ulRunTimeCounter );
+ }
+ #endif
+ }
+
+ pcWriteBuffer += strlen( ( char * ) pcWriteBuffer );
+ }
+ }
+
+ /* Free the array again. */
+ vPortFree( pxTaskStatusArray );
+ }
+ }
+
+#endif /* configGENERATE_RUN_TIME_STATS */
+
+
+