FLASH_Write_Protection

  ******************** (C) COPYRIGHT 2014 STMicroelectronics *******************
  * @file    FLASH/FLASH_WriteProtection/readme.txt 
  * @author  MCD Application Team
  * @version V1.4.0
  * @date    24-July-2014
  * @brief   FLASH Write_Protection Description.
  ******************************************************************************
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
   

Example Description

This example provides a description of how to enable and disable the write protection for the STM32F0xx embedded FLASH.

• Enable Write protection: To enable the Write Protection, uncomment the line "#define WRITE_PROTECTION_ENABLE" in main.c file. To protect a set of pages, the user has to call the function FLASH_EnableWriteProtection. The parameter of this function will define the number of pages to be protected. To load the new option byte values, a system Reset is necessary, for this, the function FLASH_OB_Launch() is used.

• Disable Write protection: To disable the Write Protection, uncomment the line "#define WRITE_PROTECTION_DISABLE" in main.c file. To disable the write protection of the STM32F0xx Flash, an erase of the Option Bytes is necessary. This operation is done by the function FLASH_EraseOptionBytes. To load the new option byte values, a system Reset is necessary, for this, the function FLASH_OB_Launch() is used.

If the desired pages are not write protected, an erase and a write operation are performed.

Directory contents

• FLASH/FLASH_WriteProtection/stm32f0xx_conf.h Library Configuration file
• FLASH/FLASH_WriteProtection/stm32f0xx_it.h Interrupt handlers header file
• FLASH/FLASH_WriteProtection/stm32f0xx_it.c Interrupt handlers
• FLASH/FLASH_WriteProtection/main.c Main program
• FLASH/FLASH_WriteProtection/main.h Header for main.c module
• FLASH/FLASH_WriteProtection/system_stm32f0xx.c STM32F0xx system source file

Note:

The "system_stm32f0xx.c" is generated by an automatic clock configuration tool and can be easily customized to meet user application requirements. To select different clock setup, use the "STM32F0xx_Clock_Configuration_VX.Y.Z.xls" provided with the AN4055 package available on ST Microcontrollers

Hardware and Software environment

• This example runs on STM32F0xx Devices.

• This example has been tested with STMicroelectronics STM320518-EVAL and STM32072B-EVAL including respectively STM32F051R8T6 and STM32F072VBT6 devices and can be easily tailored to any other supported device and development board

How to use it ?

In order to make the program work, you must do the following :

• Copy all source files from this example folder to the template folder under Project
• Open your preferred toolchain
• Rebuild all files and load your image into target memory
• Run the example

© COPYRIGHT STMicroelectronics