stm32f4xx_hal_cortex.c File Reference

CORTEX HAL module driver. This file provides firmware functions to manage the following functionalities of the CORTEX: More...

#include "stm32f4xx_hal.h"

Detailed Description

CORTEX HAL module driver. This file provides firmware functions to manage the following functionalities of the CORTEX:

Author

MCD Application Team

• Initialization and de-initialization functions
• Peripheral Control functions

==============================================================================
                      ##### 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

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