stm32f4_hal_driver/Src/stm32f4xx_hal_cortex.c

/**
  ******************************************************************************
  * @file    stm32f4xx_hal_cortex.c
  * @author  MCD Application Team
  * @brief   CORTEX HAL module driver.
  *          This file provides firmware functions to manage the following 
  *          functionalities of the CORTEX:
  *           + Initialization and de-initialization functions
  *           + Peripheral Control functions 
  *
  @verbatim  
  ==============================================================================
                        ##### How to use this driver #####
  ==============================================================================

    [..]  
    *** How to configure Interrupts using CORTEX HAL driver ***
    ===========================================================
    [..]     
    This section provides functions allowing to configure the NVIC interrupts (IRQ).
    The Cortex-M4 exceptions are managed by CMSIS functions.
   
    (#) Configure the NVIC Priority Grouping using HAL_NVIC_SetPriorityGrouping()
        function according to the following table.
    (#) Configure the priority of the selected IRQ Channels using HAL_NVIC_SetPriority(). 
    (#) Enable the selected IRQ Channels using HAL_NVIC_EnableIRQ().
    (#) please refer to programming manual for details in how to configure priority. 
      
     -@- When the NVIC_PRIORITYGROUP_0 is selected, IRQ preemption is no more possible. 
         The pending IRQ priority will be managed only by the sub priority.
   
     -@- IRQ priority order (sorted by highest to lowest priority):
        (+@) Lowest preemption priority
        (+@) Lowest sub priority
        (+@) Lowest hardware priority (IRQ number)
 
    [..]  
    *** How to configure Systick using CORTEX HAL driver ***
    ========================================================
    [..]
    Setup SysTick Timer for time base.
           
   (+) The HAL_SYSTICK_Config() function calls the SysTick_Config() function which
       is a CMSIS function that:
        (++) Configures the SysTick Reload register with value passed as function parameter.
        (++) Configures the SysTick IRQ priority to the lowest value 0x0F.
        (++) Resets the SysTick Counter register.
        (++) Configures the SysTick Counter clock source to be Core Clock Source (HCLK).
        (++) Enables the SysTick Interrupt.
        (++) Starts the SysTick Counter.
    
   (+) You can change the SysTick Clock source to be HCLK_Div8 by calling the macro
       __HAL_CORTEX_SYSTICKCLK_CONFIG(SYSTICK_CLKSOURCE_HCLK_DIV8) just after the
       HAL_SYSTICK_Config() function call. The __HAL_CORTEX_SYSTICKCLK_CONFIG() macro is defined
       inside the stm32f4xx_hal_cortex.h file.

   (+) You can change the SysTick IRQ priority by calling the
       HAL_NVIC_SetPriority(SysTick_IRQn,...) function just after the HAL_SYSTICK_Config() function 
       call. The HAL_NVIC_SetPriority() call the NVIC_SetPriority() function which is a CMSIS function.

   (+) To adjust the SysTick time base, use the following formula:
                            
       Reload Value = SysTick Counter Clock (Hz) x  Desired Time base (s)
       (++) Reload Value is the parameter to be passed for HAL_SYSTICK_Config() function
       (++) Reload Value should not exceed 0xFFFFFF
   
  @endverbatim
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2017 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file in
  * the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_hal.h"

/** @addtogroup STM32F4xx_HAL_Driver
  * @{
  */

/** @defgroup CORTEX CORTEX
  * @brief CORTEX HAL module driver
  * @{
  */

#ifdef HAL_CORTEX_MODULE_ENABLED

/* Private types -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private constants ---------------------------------------------------------*/
/* Private macros ------------------------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/* Exported functions --------------------------------------------------------*/

/** @defgroup CORTEX_Exported_Functions CORTEX Exported Functions
  * @{
  */


/** @defgroup CORTEX_Exported_Functions_Group1 Initialization and de-initialization functions
 *  @brief    Initialization and Configuration functions 
 *
@verbatim    
  ==============================================================================
              ##### Initialization and de-initialization functions #####
  ==============================================================================
    [..]
      This section provides the CORTEX HAL driver functions allowing to configure Interrupts
      Systick functionalities 

@endverbatim
  * @{
  */


/**
  * @brief  Sets the priority grouping field (preemption priority and subpriority)
  *         using the required unlock sequence.
  * @param  PriorityGroup The priority grouping bits length. 
  *         This parameter can be one of the following values:
  *         @arg NVIC_PRIORITYGROUP_0: 0 bits for preemption priority
  *                                    4 bits for subpriority
  *         @arg NVIC_PRIORITYGROUP_1: 1 bits for preemption priority
  *                                    3 bits for subpriority
  *         @arg NVIC_PRIORITYGROUP_2: 2 bits for preemption priority
  *                                    2 bits for subpriority
  *         @arg NVIC_PRIORITYGROUP_3: 3 bits for preemption priority
  *                                    1 bits for subpriority
  *         @arg NVIC_PRIORITYGROUP_4: 4 bits for preemption priority
  *                                    0 bits for subpriority
  * @note   When the NVIC_PriorityGroup_0 is selected, IRQ preemption is no more possible. 
  *         The pending IRQ priority will be managed only by the subpriority. 
  * @retval None
  */
void HAL_NVIC_SetPriorityGrouping(uint32_t PriorityGroup)
{
  /* Check the parameters */
  assert_param(IS_NVIC_PRIORITY_GROUP(PriorityGroup));
  
  /* Set the PRIGROUP[10:8] bits according to the PriorityGroup parameter value */
  NVIC_SetPriorityGrouping(PriorityGroup);
}

/**
  * @brief  Sets the priority of an interrupt.
  * @param  IRQn External interrupt number.
  *         This parameter can be an enumerator of IRQn_Type enumeration
  *         (For the complete STM32 Devices IRQ Channels list, please refer to the appropriate CMSIS device file (stm32f4xxxx.h))
  * @param  PreemptPriority The preemption priority for the IRQn channel.
  *         This parameter can be a value between 0 and 15
  *         A lower priority value indicates a higher priority 
  * @param  SubPriority the subpriority level for the IRQ channel.
  *         This parameter can be a value between 0 and 15
  *         A lower priority value indicates a higher priority.          
  * @retval None
  */
void HAL_NVIC_SetPriority(IRQn_Type IRQn, uint32_t PreemptPriority, uint32_t SubPriority)
{ 
  uint32_t prioritygroup = 0x00U;
  
  /* Check the parameters */
  assert_param(IS_NVIC_SUB_PRIORITY(SubPriority));
  assert_param(IS_NVIC_PREEMPTION_PRIORITY(PreemptPriority));
  
  prioritygroup = NVIC_GetPriorityGrouping();
  
  NVIC_SetPriority(IRQn, NVIC_EncodePriority(prioritygroup, PreemptPriority, SubPriority));
}

/**
  * @brief  Enables a device specific interrupt in the NVIC interrupt controller.
  * @note   To configure interrupts priority correctly, the NVIC_PriorityGroupConfig()
  *         function should be called before. 
  * @param  IRQn External interrupt number.
  *         This parameter can be an enumerator of IRQn_Type enumeration
  *         (For the complete STM32 Devices IRQ Channels list, please refer to the appropriate CMSIS device file (stm32f4xxxx.h))
  * @retval None
  */
void HAL_NVIC_EnableIRQ(IRQn_Type IRQn)
{
  /* Check the parameters */
  assert_param(IS_NVIC_DEVICE_IRQ(IRQn));
  
  /* Enable interrupt */
  NVIC_EnableIRQ(IRQn);
}

/**
  * @brief  Disables a device specific interrupt in the NVIC interrupt controller.
  * @param  IRQn External interrupt number.
  *         This parameter can be an enumerator of IRQn_Type enumeration
  *         (For the complete STM32 Devices IRQ Channels list, please refer to the appropriate CMSIS device file (stm32f4xxxx.h))
  * @retval None
  */
void HAL_NVIC_DisableIRQ(IRQn_Type IRQn)
{
  /* Check the parameters */
  assert_param(IS_NVIC_DEVICE_IRQ(IRQn));
  
  /* Disable interrupt */
  NVIC_DisableIRQ(IRQn);
}

/**
  * @brief  Initiates a system reset request to reset the MCU.
  * @retval None
  */
void HAL_NVIC_SystemReset(void)
{
  /* System Reset */
  NVIC_SystemReset();
}

/**
  * @brief  Initializes the System Timer and its interrupt, and starts the System Tick Timer.
  *         Counter is in free running mode to generate periodic interrupts.
  * @param  TicksNumb Specifies the ticks Number of ticks between two interrupts.
  * @retval status:  - 0  Function succeeded.
  *                  - 1  Function failed.
  */
uint32_t HAL_SYSTICK_Config(uint32_t TicksNumb)
{
   return SysTick_Config(TicksNumb);
}
/**
  * @}
  */

/** @defgroup CORTEX_Exported_Functions_Group2 Peripheral Control functions
 *  @brief   Cortex control functions 
 *
@verbatim   
  ==============================================================================
                      ##### Peripheral Control functions #####
  ==============================================================================  
    [..]
      This subsection provides a set of functions allowing to control the CORTEX
      (NVIC, SYSTICK, MPU) functionalities. 
 
      
@endverbatim
  * @{
  */

#if (__MPU_PRESENT == 1U)
/**
  * @brief  Disables the MPU
  * @retval None
  */
void HAL_MPU_Disable(void)
{
  /* Make sure outstanding transfers are done */
  __DMB();

  /* Disable fault exceptions */
  SCB->SHCSR &= ~SCB_SHCSR_MEMFAULTENA_Msk;
  
  /* Disable the MPU and clear the control register*/
  MPU->CTRL = 0U;
}

/**
  * @brief  Enable the MPU.
  * @param  MPU_Control Specifies the control mode of the MPU during hard fault, 
  *          NMI, FAULTMASK and privileged access to the default memory 
  *          This parameter can be one of the following values:
  *            @arg MPU_HFNMI_PRIVDEF_NONE
  *            @arg MPU_HARDFAULT_NMI
  *            @arg MPU_PRIVILEGED_DEFAULT
  *            @arg MPU_HFNMI_PRIVDEF
  * @retval None
  */
void HAL_MPU_Enable(uint32_t MPU_Control)
{
  /* Enable the MPU */
  MPU->CTRL = MPU_Control | MPU_CTRL_ENABLE_Msk;
  
  /* Enable fault exceptions */
  SCB->SHCSR |= SCB_SHCSR_MEMFAULTENA_Msk;
  
  /* Ensure MPU setting take effects */
  __DSB();
  __ISB();
}

/**
  * @brief  Enables the MPU Region.
  * @retval None
  */
void HAL_MPU_EnableRegion(uint32_t RegionNumber)
{
  /* Check the parameters */
  assert_param(IS_MPU_REGION_NUMBER(RegionNumber));

  /* Set the Region number */
  MPU->RNR = RegionNumber;

  /* Enable the Region */
  SET_BIT(MPU->RASR, MPU_RASR_ENABLE_Msk);
}

/**
  * @brief  Disables the MPU Region.
  * @retval None
  */
void HAL_MPU_DisableRegion(uint32_t RegionNumber)
{
  /* Check the parameters */
  assert_param(IS_MPU_REGION_NUMBER(RegionNumber));

  /* Set the Region number */
  MPU->RNR = RegionNumber;

  /* Disable the Region */
  CLEAR_BIT(MPU->RASR, MPU_RASR_ENABLE_Msk);
}

/**
  * @brief  Initializes and configures the Region and the memory to be protected.
  * @param MPU_Init Pointer to a MPU_Region_InitTypeDef structure that contains
  *                the initialization and configuration information.
  * @retval None
  */
void HAL_MPU_ConfigRegion(MPU_Region_InitTypeDef *MPU_Init)
{
  /* Check the parameters */
  assert_param(IS_MPU_REGION_NUMBER(MPU_Init->Number));
  assert_param(IS_MPU_REGION_ENABLE(MPU_Init->Enable));
  assert_param(IS_MPU_INSTRUCTION_ACCESS(MPU_Init->DisableExec));
  assert_param(IS_MPU_REGION_PERMISSION_ATTRIBUTE(MPU_Init->AccessPermission));
  assert_param(IS_MPU_TEX_LEVEL(MPU_Init->TypeExtField));
  assert_param(IS_MPU_ACCESS_SHAREABLE(MPU_Init->IsShareable));
  assert_param(IS_MPU_ACCESS_CACHEABLE(MPU_Init->IsCacheable));
  assert_param(IS_MPU_ACCESS_BUFFERABLE(MPU_Init->IsBufferable));
  assert_param(IS_MPU_SUB_REGION_DISABLE(MPU_Init->SubRegionDisable));
  assert_param(IS_MPU_REGION_SIZE(MPU_Init->Size));

  /* Set the Region number */
  MPU->RNR = MPU_Init->Number;

  /* Disable the Region */
  CLEAR_BIT(MPU->RASR, MPU_RASR_ENABLE_Msk);

  /* Apply configuration */
  MPU->RBAR = MPU_Init->BaseAddress;
  MPU->RASR = ((uint32_t)MPU_Init->DisableExec             << MPU_RASR_XN_Pos)   |
              ((uint32_t)MPU_Init->AccessPermission        << MPU_RASR_AP_Pos)   |
              ((uint32_t)MPU_Init->TypeExtField            << MPU_RASR_TEX_Pos)  |
              ((uint32_t)MPU_Init->IsShareable             << MPU_RASR_S_Pos)    |
              ((uint32_t)MPU_Init->IsCacheable             << MPU_RASR_C_Pos)    |
              ((uint32_t)MPU_Init->IsBufferable            << MPU_RASR_B_Pos)    |
              ((uint32_t)MPU_Init->SubRegionDisable        << MPU_RASR_SRD_Pos)  |
              ((uint32_t)MPU_Init->Size                    << MPU_RASR_SIZE_Pos) |
              ((uint32_t)MPU_Init->Enable                  << MPU_RASR_ENABLE_Pos);
}
#endif /* __MPU_PRESENT */

/**
  * @brief  Clear pending events.
  * @retval None
  */
void HAL_CORTEX_ClearEvent(void)
{
  __SEV();
  __WFE();
}

/**
  * @brief  Gets the priority grouping field from the NVIC Interrupt Controller.
  * @retval Priority grouping field (SCB->AIRCR [10:8] PRIGROUP field)
  */
uint32_t HAL_NVIC_GetPriorityGrouping(void)
{
  /* Get the PRIGROUP[10:8] field value */
  return NVIC_GetPriorityGrouping();
}

/**
  * @brief  Gets the priority of an interrupt.
  * @param  IRQn External interrupt number.
  *         This parameter can be an enumerator of IRQn_Type enumeration
  *         (For the complete STM32 Devices IRQ Channels list, please refer to the appropriate CMSIS device file (stm32f4xxxx.h))
  * @param   PriorityGroup the priority grouping bits length.
  *         This parameter can be one of the following values:
  *           @arg NVIC_PRIORITYGROUP_0: 0 bits for preemption priority
  *                                      4 bits for subpriority
  *           @arg NVIC_PRIORITYGROUP_1: 1 bits for preemption priority
  *                                      3 bits for subpriority
  *           @arg NVIC_PRIORITYGROUP_2: 2 bits for preemption priority
  *                                      2 bits for subpriority
  *           @arg NVIC_PRIORITYGROUP_3: 3 bits for preemption priority
  *                                      1 bits for subpriority
  *           @arg NVIC_PRIORITYGROUP_4: 4 bits for preemption priority
  *                                      0 bits for subpriority
  * @param  pPreemptPriority Pointer on the Preemptive priority value (starting from 0).
  * @param  pSubPriority Pointer on the Subpriority value (starting from 0).
  * @retval None
  */
void HAL_NVIC_GetPriority(IRQn_Type IRQn, uint32_t PriorityGroup, uint32_t *pPreemptPriority, uint32_t *pSubPriority)
{
  /* Check the parameters */
  assert_param(IS_NVIC_PRIORITY_GROUP(PriorityGroup));
 /* Get priority for Cortex-M system or device specific interrupts */
  NVIC_DecodePriority(NVIC_GetPriority(IRQn), PriorityGroup, pPreemptPriority, pSubPriority);
}

/**
  * @brief  Sets Pending bit of an external interrupt.
  * @param  IRQn External interrupt number
  *         This parameter can be an enumerator of IRQn_Type enumeration
  *         (For the complete STM32 Devices IRQ Channels list, please refer to the appropriate CMSIS device file (stm32f4xxxx.h))
  * @retval None
  */
void HAL_NVIC_SetPendingIRQ(IRQn_Type IRQn)
{
  /* Check the parameters */
  assert_param(IS_NVIC_DEVICE_IRQ(IRQn));
  
  /* Set interrupt pending */
  NVIC_SetPendingIRQ(IRQn);
}

/**
  * @brief  Gets Pending Interrupt (reads the pending register in the NVIC 
  *         and returns the pending bit for the specified interrupt).
  * @param  IRQn External interrupt number.
  *          This parameter can be an enumerator of IRQn_Type enumeration
  *         (For the complete STM32 Devices IRQ Channels list, please refer to the appropriate CMSIS device file (stm32f4xxxx.h))
  * @retval status: - 0  Interrupt status is not pending.
  *                 - 1  Interrupt status is pending.
  */
uint32_t HAL_NVIC_GetPendingIRQ(IRQn_Type IRQn)
{
  /* Check the parameters */
  assert_param(IS_NVIC_DEVICE_IRQ(IRQn));
  
  /* Return 1 if pending else 0 */
  return NVIC_GetPendingIRQ(IRQn);
}

/**
  * @brief  Clears the pending bit of an external interrupt.
  * @param  IRQn External interrupt number.
  *         This parameter can be an enumerator of IRQn_Type enumeration
  *         (For the complete STM32 Devices IRQ Channels list, please refer to the appropriate CMSIS device file (stm32f4xxxx.h))
  * @retval None
  */
void HAL_NVIC_ClearPendingIRQ(IRQn_Type IRQn)
{
  /* Check the parameters */
  assert_param(IS_NVIC_DEVICE_IRQ(IRQn));
  
  /* Clear pending interrupt */
  NVIC_ClearPendingIRQ(IRQn);
}

/**
  * @brief Gets active interrupt ( reads the active register in NVIC and returns the active bit).
  * @param IRQn External interrupt number
  *         This parameter can be an enumerator of IRQn_Type enumeration
  *         (For the complete STM32 Devices IRQ Channels list, please refer to the appropriate CMSIS device file (stm32f4xxxx.h))
  * @retval status: - 0  Interrupt status is not pending.
  *                 - 1  Interrupt status is pending.
  */
uint32_t HAL_NVIC_GetActive(IRQn_Type IRQn)
{
  /* Check the parameters */
  assert_param(IS_NVIC_DEVICE_IRQ(IRQn));
  
  /* Return 1 if active else 0 */
  return NVIC_GetActive(IRQn);
}

/**
  * @brief  Configures the SysTick clock source.
  * @param  CLKSource specifies the SysTick clock source.
  *          This parameter can be one of the following values:
  *             @arg SYSTICK_CLKSOURCE_HCLK_DIV8: AHB clock divided by 8 selected as SysTick clock source.
  *             @arg SYSTICK_CLKSOURCE_HCLK: AHB clock selected as SysTick clock source.
  * @retval None
  */
void HAL_SYSTICK_CLKSourceConfig(uint32_t CLKSource)
{
  /* Check the parameters */
  assert_param(IS_SYSTICK_CLK_SOURCE(CLKSource));
  if (CLKSource == SYSTICK_CLKSOURCE_HCLK)
  {
    SysTick->CTRL |= SYSTICK_CLKSOURCE_HCLK;
  }
  else
  {
    SysTick->CTRL &= ~SYSTICK_CLKSOURCE_HCLK;
  }
}

/**
  * @brief  This function handles SYSTICK interrupt request.
  * @retval None
  */
void HAL_SYSTICK_IRQHandler(void)
{
  HAL_SYSTICK_Callback();
}

/**
  * @brief  SYSTICK callback.
  * @retval None
  */
__weak void HAL_SYSTICK_Callback(void)
{
  /* NOTE : This function Should not be modified, when the callback is needed,
            the HAL_SYSTICK_Callback could be implemented in the user file
   */
}

/**
  * @}
  */

/**
  * @}
  */

#endif /* HAL_CORTEX_MODULE_ENABLED */
/**
  * @}
  */

/**
  * @}
  */