361 lines
12 KiB
C
361 lines
12 KiB
C
/**
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******************************************************************************
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* @file stm32_seq.h
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* @author MCD Application Team
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* @brief sequencer interface
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******************************************************************************
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* @attention
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*
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* <h2><center>© Copyright (c) 2019 STMicroelectronics.
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* All rights reserved.</center></h2>
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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*/
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/* Define to prevent recursive inclusion -------------------------------------*/
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#ifndef STM32_SEQ_H
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#define STM32_SEQ_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Includes ------------------------------------------------------------------*/
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#include "stdint.h"
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/** @defgroup SEQUENCER sequencer utilities
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* @{
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*/
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/* Exported types ------------------------------------------------------------*/
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/** @defgroup SEQUENCER_Exported_type SEQUENCER exported types
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* @{
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*/
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/**
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* @brief bit mapping of the task.
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* this value is used to represent a list of task (each corresponds to a task).
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*/
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typedef uint32_t UTIL_SEQ_bm_t;
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/**
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* @}
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*/
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/* Exported constants --------------------------------------------------------*/
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/** @defgroup SEQUENCER_Exported_const SEQUENCER exported constants
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* @{
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*/
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/**
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* @brief This provides a default value for unused parameter
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*
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*/
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#define UTIL_SEQ_RFU 0
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/**
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* @brief Default value used to start the scheduling.
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*
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* This informs the sequencer that all tasks registered shall be considered
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*
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* @note
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* This should be used in the application\n
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* while(1)\n
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* {\n
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* UTIL_SEQ_Run( UTIL_SEQ_DEFAULT );\n
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* }\n
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*
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*/
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#define UTIL_SEQ_DEFAULT (~0U)
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/**
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* @}
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*/
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/* External variables --------------------------------------------------------*/
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/* Exported macros -----------------------------------------------------------*/
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/** @defgroup SEQUENCER_Exported_macro SEQUENCER exported macros
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* @{
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*/
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/**
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* @brief This macro can be used to define a task with one parameter
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*
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* @note this is an example of using this macro
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*
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* task prototype definition
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* void FUNCTION_NAME(void *Instance)
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* {
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* uint8_t _instance = *(uint8_t*) Instance;
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* }
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*
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* task declaration in the application for two instances
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* const uint8_t instance1 = 1;
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* const uint8_t instance2 = 2;
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* UTIL_SEQ_TaskParamDef(FUNCTION_NAME, instance1)
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* UTIL_SEQ_TaskParamDef(FUNCTION_NAME, instance2)
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*
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* task initialization
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* UTIL_SEQ_RegTask(1 << 1, 0, UTIL_SEQ_TaskFunction(FUNCTION_NAME,instance2));
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* UTIL_SEQ_RegTask(1 << 10, 0, UTIL_SEQ_TaskFunction(FUNCTION_NAME,instance3));
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*
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* Then no change on the management of the task within the application, the instance being managed within the overloaded function
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*
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*/
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#define UTIL_SEQ_TaskParamDef(_FUNC_,_PARAM_VAL_) \
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static void SEQ_FUNC_##_FUNC_##_PARAM_VAL_(void); \
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static void SEQ_FUNC_##_FUNC_##_PARAM_VAL_(void) \
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{ \
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static void *SEQ_PARAM_##_FUNC_ = (void*)&_PARAM_VAL_;\
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_FUNC_(SEQ_PARAM_##_FUNC_); \
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}
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/**
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* @brief This macro is used to retrieve the function name of the task
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*/
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#define UTIL_SEQ_TaskFunction(_FUNC_,_PARAM_VAL_) SEQ_FUNC_##_FUNC_##_PARAM_VAL_
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/**
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* @}
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*/
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/* Exported functions ------------------------------------------------------- */
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/** @defgroup SEQUENCER_Exported_function SEQUENCER exported functions
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* @{
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*/
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/**
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* @brief This function initializes the sequencer resources.
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*
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* @note It shall not be called from an ISR.
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*
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*/
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void UTIL_SEQ_Init( void );
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/**
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* @brief This function un-initializes the sequencer resources.
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*
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* @note It shall not be called from an ISR
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*
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*/
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void UTIL_SEQ_DeInit( void );
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/**
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* @brief This function is called by the sequencer in critical section (PRIMASK bit) when
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* - there are no more tasks to be executed
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* AND
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* - there are no pending event or the pending event is still not set
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* @note The application should enter low power mode in this function
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* When this function is not implemented by the application, the sequencer keeps running a while loop (RUN MODE).
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* It shall be called only by the sequencer.
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*
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*/
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void UTIL_SEQ_Idle( void );
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/**
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* @brief This function is called by the sequencer outside critical section just before calling UTIL_SEQ_Idle( )
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* UTIL_SEQ_PreIdle() is considered as the last task executed before calling UTIL_SEQ_Idle( )
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* In case a task or an event is set from an interrupt handler just after UTIL_SEQ_PreIdle() is called,
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* UTIL_SEQ_Idle() will not be called.
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*
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* @note It shall be called only by the sequencer.
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*
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*/
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void UTIL_SEQ_PreIdle( void );
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/**
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* @brief This function is called by the sequencer outside critical section either
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* - after calling UTIL_SEQ_Idle( )
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* OR
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* - after calling UTIL_SEQ_PreIdle( ) without call to UTIL_SEQ_Idle() due to an incoming task set or event
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* requested after UTIL_SEQ_PreIdle() has been called.
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*
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* @note UTIL_SEQ_PostIdle() is always called if UTIL_SEQ_PreIdle() has been called and never called otherwise.
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* It shall be called only by the sequencer.
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*
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*/
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void UTIL_SEQ_PostIdle( void );
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/**
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* @brief This function requests the sequencer to execute all pending tasks using round robin mechanism.
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* When no task are pending, it calls UTIL_SEQ_Idle();
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* This function should be called in a while loop in the application
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*
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* @param Mask_bm list of task (bit mapping) that is be kept in the sequencer list.
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*
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* @note It shall not be called from an ISR.
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* @note The construction of the task must take into account the fact that there is no counting / protection
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* on the activation of the task. Thus, when the task is running, it must perform all the operations
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* in progress programmed before its call or manage a reprogramming of the task.
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*
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*/
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void UTIL_SEQ_Run( UTIL_SEQ_bm_t Mask_bm );
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/**
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* @brief This function registers a task in the sequencer.
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*
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* @param TaskId_bm The Id of the task
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* @param Flags Flags are reserved param for future use
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* @param Task Reference of the function to be executed
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*
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* @note It may be called from an ISR.
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*
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*/
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void UTIL_SEQ_RegTask( UTIL_SEQ_bm_t TaskId_bm, uint32_t Flags, void (*Task)( void ) );
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/**
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* @brief This function requests a task to be executed
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*
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* @param TaskId_bm The Id of the task
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* It shall be (1<<task_id) where task_id is the number assigned when the task has been registered
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* @param Task_Prio The priority of the task
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* It shall a number from 0 (high priority) to 31 (low priority)
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* The priority is checked each time the sequencer needs to select a new task to execute
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* It does not permit to preempt a running task with lower priority
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*
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* @note It may be called from an ISR
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*
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*/
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void UTIL_SEQ_SetTask( UTIL_SEQ_bm_t TaskId_bm , uint32_t Task_Prio );
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/**
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* @brief This function checks if a task could be scheduled.
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*
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* @param TaskId_bm The Id of the task
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* It shall be (1<<task_id) where task_id is the number assigned when the task has been registered
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* @retval 0 if not 1 if true
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*
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* @note It may be called from an ISR.
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*
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*/
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uint32_t UTIL_SEQ_IsSchedulableTask( UTIL_SEQ_bm_t TaskId_bm);
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/**
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* @brief This function prevents a task to be called by the sequencer even when set with UTIL_SEQ_SetTask()
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* By default, all tasks are executed by the sequencer when set with UTIL_SEQ_SetTask()
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* When a task is paused, it is moved out from the sequencer list
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*
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* @param TaskId_bm The Id of the task
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* It shall be (1<<task_id) where task_id is the number assigned when the task has been registered
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*
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* @note It may be called from an ISR.
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*
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*/
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void UTIL_SEQ_PauseTask( UTIL_SEQ_bm_t TaskId_bm );
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/**
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* @brief This function allows to know if the task has been put in pause.
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* By default, all tasks are executed by the sequencer when set with UTIL_SEQ_SetTask()
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* The exit of the pause shall be done by the function UTIL_SEQ_ResumeTask.
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*
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* @param TaskId_bm The Id of the task
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* It shall be (1<<task_id) where task_id is the number assigned when the task has been registered
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*
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* @note It may be called from an ISR.
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*
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*/
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uint32_t UTIL_SEQ_IsPauseTask( UTIL_SEQ_bm_t TaskId_bm );
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/**
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* @brief This function allows again a task to be called by the sequencer if set with UTIL_SEQ_SetTask()
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* This is used in relation with UTIL_SEQ_PauseTask()
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*
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* @param TaskId_bm The Id of the task
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* It shall be (1<<task_id) where task_id is the number assigned when the task has been registered
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*
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* @note It may be called from an ISR.
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*
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*/
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void UTIL_SEQ_ResumeTask( UTIL_SEQ_bm_t TaskId_bm );
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/**
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* @brief This function sets an event that is waited with UTIL_SEQ_WaitEvt()
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*
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* @param EvtId_bm event id bit mask
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*
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* @note An event shall be a 32 bit mapping where only 1 bit is set
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* It may be called from an ISR.
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*
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*/
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void UTIL_SEQ_SetEvt( UTIL_SEQ_bm_t EvtId_bm );
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/**
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* @brief This function may be used to clear the event before calling UTIL_SEQ_WaitEvt()
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* This API may be useful when the UTIL_SEQ_SetEvt() is called several time to notify the same event.
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* Due to Software Architecture where the timings are hard to control, this may be an unwanted case.
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*
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* @param EvtId_bm event id bm
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* It shall be a bit mapping where only 1 bit is set
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*
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* @note It may be called from an ISR.
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*
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*/
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void UTIL_SEQ_ClrEvt( UTIL_SEQ_bm_t EvtId_bm );
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/**
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* @brief This function waits for a specific event to be set. The sequencer loops UTIL_SEQ_EvtIdle() until the event is set
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* When called recursively, it acts as a First in / Last out mechanism. The sequencer waits for the
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* last event requested to be set even though one of the already requested event has been set.
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*
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* @param EvtId_bm event id bit mask
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* It shall be a bit mapping where only 1 bit is set
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*
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* @note It shall not be called from an ISR.
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* @note The construction of the task must take into account the fact that there is no counting / protection on the
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* event. Thus, when the task is running, it must perform all the operations in progress programmed before its call
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* or manage a reprogramming of the task.
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*/
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void UTIL_SEQ_WaitEvt( UTIL_SEQ_bm_t EvtId_bm );
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/**
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* @brief This function returns whether the waited event is pending or not
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* It is useful only when the UTIL_SEQ_EvtIdle() is overloaded by the application. In that case, when the low
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* power mode needs to be executed, the application shall first check whether the waited event is pending
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* or not. Both the event checking and the low power mode processing should be done in critical section
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*
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* @retval 0 when the waited event is not there or the evt_id when the waited event is pending
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*
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* @note It may be called from an ISR.
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*
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*/
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UTIL_SEQ_bm_t UTIL_SEQ_IsEvtPend( void );
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/**
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* @brief This function loops until the waited event is set
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* @param TaskId_bm The task id that is currently running. When task_id_bm = 0, it means UTIL_SEQ_WaitEvt( )
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* has been called outside a registered task (ie at startup before UTIL_SEQ_Run( ) has been called
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* @param EvtWaited_bm The event id that is waited.
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*
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* @note When not implemented by the application, it calls UTIL_SEQ_Run(~TaskId_bm) which means the waited
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* task is suspended until the waited event and the other tasks are running or the application enter
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* low power mode.
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* Else the user can redefine his own function for example call sequencer UTIL_SEQ_Run(0) to suspend all
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* the task and let the sequencer enter the low power mode.
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* It shall be called only by the sequencer.
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*
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*/
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void UTIL_SEQ_EvtIdle( UTIL_SEQ_bm_t TaskId_bm, UTIL_SEQ_bm_t EvtWaited_bm );
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/**
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* @}
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*/
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/**
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* @}
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*/
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#ifdef __cplusplus
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}
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#endif
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#endif /*__STM32_SEQ_H */
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