1，目的

在實際的產品發(fā)布中，如果不對儲存在單片機Flash中的程序做一些保護的話，就有可能被一些不法公司，通過仿真器（J-Link，ST-Link等）把Flash中的程序讀取回來，得到bin文件或hex文件，然后去山寨產品。所以我們需要對程序進行保護，一種比較簡單可靠的方法就是把Flash設置成讀保護。

2，開發(fā)環(huán)境

1，適用芯片：STM32F4全部芯片

2，固件庫：STM32F4xx_DSP_StdPeriph_Lib_V1.8.0

3，IDE：MDK517

3，程序源碼

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

* 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);

}