STM32 F4系列设置Flash读保护

转载已于 2023-03-16 20:09:22 修改 · 933 阅读

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原文链接：https://blog.youkuaiyun.com/u012325601/article/details/56298404

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#stm32 #单片机 #嵌入式硬件

于 2023-03-16 20:07:55 首次发布

该代码段提供了两个函数，分别用于启用和禁用STM32F4系列芯片的用户闪存区读保护。通过调用FLASH_OB_GetRDP检查当前保护状态，然后解锁OptionBytes，配置读保护级别（OB_RDP_Level_1为启用，OB_RDP_Level_0为禁用），并使用FLASH_OB_Launch启动编程过程。如果编程不成功，会锁定OptionBytes并返回错误代码。

适用芯片：STM32F4全部芯片

1 开启读保护

/****************************************************************
 * Function:    Flash_EnableReadProtection
 * Description: Enable the read protection of user flash area.
 * Input:
 * Output:
 * Return:      1: Read Protection successfully enable
 *              2: Error: Flash read unprotection failed
*****************************************************************/
uint32_t Flash_EnableReadProtection(void)
{
  /* Returns the FLASH Read Protection level. */
  if( FLASH_OB_GetRDP() == RESET )
  {
    /* Unlock the Option Bytes */
    FLASH_OB_Unlock();
    
    /* Sets the read protection level. */
    FLASH_OB_RDPConfig(OB_RDP_Level_1);
    
    /* Start the Option Bytes programming process. */  
    if (FLASH_OB_Launch() != FLASH_COMPLETE)
    {
      /* Disable the Flash option control register access (recommended to protect 
         the option Bytes against possible unwanted operations) */
      FLASH_OB_Lock();
      
      /* Error: Flash read unprotection failed */
      return (2);
    }
  
    /* Disable the Flash option control register access (recommended to protect 
       the option Bytes against possible unwanted operations) */
    FLASH_OB_Lock();
 
    /* Read Protection successfully enable */
    return (1);
  }
  
  /* Read Protection successfully enable */
  return (1);
}

2 解除读保护

/****************************************************************
 * Function:    Flash_DisableReadProtection
 * Description: Disable the read protection of user flash area.
 * Input:
 * Output:
 * Return:      1: Read Protection successfully disable
 *              2: Error: Flash read unprotection failed
*****************************************************************/
uint32_t Flash_DisableReadProtection(void)
{
  /* Returns the FLASH Read Protection level. */
  if( FLASH_OB_GetRDP() != RESET )
  {
    /* Unlock the Option Bytes */
    FLASH_OB_Unlock();
    
    /* Sets the read protection level. */
    FLASH_OB_RDPConfig(OB_RDP_Level_0);
    
    /* Start the Option Bytes programming process. */  
    if (FLASH_OB_Launch() != FLASH_COMPLETE)
    {
      /* Disable the Flash option control register access (recommended to protect 
         the option Bytes against possible unwanted operations) */
      FLASH_OB_Lock();
      
      /* Error: Flash read unprotection failed */
      return (2);
    }
  
    /* Disable the Flash option control register access (recommended to protect 
       the option Bytes against possible unwanted operations) */
    FLASH_OB_Lock();
 
    /* Read Protection successfully disable */
    return (1);
  }
  
  /* Read Protection successfully disable */
  return (1);
}