FW Read protection in code level

#1, for ST
FLASH_OBProgramInitTypeDef OBInit; //flash option bytes
__HAL_FLASH_PREFETCH_BUFFER_DISABLE(); //prefetch buffer disable

HAL_FLASHEx_OBGetConfig(&OBInit); //Get the Option byte configuration
if(OBInit.RDPLevel == OB_RDP_LEVEL_0)//option byte read protection
{
OBInit.OptionType = OPTIONBYTE_RDP;
OBInit.RDPLevel = OB_RDP_LEVEL_1;
HAL_FLASH_Unlock();
HAL_FLASH_OB_Unlock();
HAL_FLASHEx_OBProgram(&OBInit);
HAL_FLASH_OB_Lock();
HAL_FLASH_Lock();
}
__HAL_FLASH_PREFETCH_BUFFER_ENABLE();
读保护分三个 级别，具体定义如下：

#2, for GD

https://blog.csdn.net/u011106767/article/details/123168468?ops_request_misc=&request_id=&biz_id=102&utm_term=fmc%20GD%E4%BF%9D%E6%8A%A4&utm_medium=distribute.pc_search_result.none-task-blog-2_allsobaiduweb~default-3-123168468.142^v62js_top,201^v3control_1,213^v1t3_esquery_v1&spm=1018.2226.3001.4187
bank0, bank1 解锁

2. Option byte解锁
   
   
   
   对于GD303：
   #1， 仅仅只有读保护 & 未保护两种状态
   #2， 读保护设置后，需要重启后生效
   #3， 读保护后，烧录器不能通过Connect来读取flash程序
   #4， 程序本身可以读取flash内容
   #5， 通过烧写程序来取消读保护，和更新程序
   #6， 在读保护的状态下，不能用Keil Debug

Detail code：
/******************************************

• Flash read protection
• option byte setting
• 303, code can read flash content if read flash enable, simulator can read flash
  ******************************************/
  void SetFlashRdProtection(void)
  {
  fmc_state_enum res = FMC_BUSY;
  if(RESET == ob_spc_get())
  {
  printf(“%s %s %d %s \r\n”,FILE,func, LINE,“set flash reading protection”);
  fmc_unlock(); //unlock bank0 flash
  ob_unlock(); //unlock option byte
  ob_erase(); //option byte erase
  res = ob_security_protection_config(FMC_USPC); //start protection
  ob_lock(); //exit option lock
  fmc_lock(); //exit bank0 flash
  }
  }

Option bytes memory位置