STM32CubeF4

/**
  @page FLASH_WriteProtection FLASH Write protection example
  
  @verbatim
  ******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
  * @file    FLASH/FLASH_WriteProtection/readme.txt
  * @author  MCD Application Team
  * @brief   Description of the FLASH Write protection example.
  ******************************************************************************
  * @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.
  *
  ******************************************************************************
   @endverbatim

@par Example Description 

This example describes how to configure and use the FLASH HAL API to enable and 
disable the write protection of the internal Flash memory.

This example guides you through the different configuration steps by mean of HAL API
how to enable and disable the write protection for internal Flash memory integrated 
within  STM32F4xx devices, mounted on STM324x9I-EVAL evaluation board.
  
At the beginning of the main program the HAL_Init() function is called to reset 
all the peripherals, initialize the Flash interface and the systick.
Then the SystemClock_Config() function is used to configure the system clock (SYSCLK) 
to run at 180 MHz.

Each time the User push-button is pressed/released, the program will check the 
write protection status of FLASH_WRP_SECTORS (defined in main.c) 
  - If FLASH_WRP_SECTORS are write protected, the write protection will be disabled.
    Then the following message will be displayed on LCD, if protection disable 
    operation is done correctly: 
    "Write protection is disabled"
    Otherwise the following message will be displayed on LCD:
    "Write protection is not disabled"
  - If FLASH_WRP_SECTORS are not write protected, the write protection will be enabled.
    Then the following message will be displayed on LCD, if protection enable 
    operation is done correctly:
    "Write protection is enabled"
    Otherwise the following message will be displayed on LCD:
    "Write protection is not enabled"

@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
      based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
      a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
      than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
      To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
      
@note The application needs to ensure that the SysTick time base is always set to 1 millisecond
      to have correct HAL operation.

@par Keywords

Memory, Flash, Write protection, Sector, Program, Erase

@par Directory contents 

  - FLASH/FLASH_WriteProtection/Inc/stm32f4xx_hal_conf.h        Library Configuration file  
  - FLASH/FLASH_WriteProtection/Inc/stm32f4xx_it.h              Interrupt handlers header file
  - FLASH/FLASH_WriteProtection/Inc/main.h                      Main program header file 
  - FLASH/FLASH_WriteProtection/Src/stm32f4xx_it.c              Interrupt handlers
  - FLASH/FLASH_WriteProtection/Src/main.c                      Main program
  - FLASH/FLASH_WriteProtection/Src/system_stm32f4xx.c          STM32F4xx system clock configuration file
 
 
@par Hardware and Software environment 

  - This example runs on STM32F429xx/STM32F439xx devices.
  
  - This example has been tested with STMicroelectronics STM324x9I-EVAL RevB 
    evaluation boards and can be easily tailored to any other supported device 
    and development board.

      
@par How to use it ? 

In order to make the program work, you must do the following :
 - Open your preferred toolchain 
 - Rebuild all files and load your image into target memory
 - Run the example   
   

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