转 STM32F4(Flash读保护)

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最新推荐文章于 2025-02-17 23:28:51 发布

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分类专栏： bootloader 微控制器/STM32/DSP/PLC/EMC

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介绍了如何在STM32F4系列芯片上启用和禁用Flash读保护功能，提供了具体的函数实现，并解释了为何要对Flash进行读保护。

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/****************************************************************

 * 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);

}

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
---------------------
作者：XinLiBK
来源：优快云
原文：https://blog.youkuaiyun.com/u012325601/article/details/56298404
版权声明：本文为博主原创文章，转载请附上博文链接！

https://blog.youkuaiyun.com/u012325601/article/details/56298404