STM32F4(Flash读保护)

STM32F4(Flash读保护)

1,目的

        在实际的产品发布中,如果不对储存在单片机Flash中的程序做一些保护的话,就有可能被一些不法公司,通过仿真器(J-Link,ST-Link等)把Flash中的程序读取回来,得到bin文件或hex文件,然后去山寨产品。所以我们需要对程序进行保护,一种比较简单可靠的方法就是把Flash设置成读保护。

2,开发环境

        1,适用芯片:STM32F4全部芯片

        2,固件库:STM32F4xx_DSP_StdPeriph_Lib_V1.8.0

        3,IDE:MDK517

3,程序源码

/****************************************************************
 * 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);
}
 
/****************************************************************
 * 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);
}



原文:https://blog.csdn.net/u012325601/article/details/56298404 
 

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