ARM, RISC-V контроллеры

#define OB_RDP_LEVEL_0   ((uint8_t)0xAA)
#define OB_RDP_LEVEL_1   ((uint8_t)0x55)
#define OB_RDP_LEVEL_2   ((uint8_t)0xCC) /*!< Warning: When enabling read protection level 2 
                    
                                              it s no more possible to go back to level 1 or 0 */
void flash::UnlockOB()
{ 
  FLASH->OPTKEYR = 0x08192A3BU;
  FLASH->OPTKEYR = 0x4C5D6E7FU;
}

void flash::LockOB()
{
  FLASH->OPTCR |= FLASH_OPTCR_OPTLOCK;
  while(FLASH->SR & FLASH_SR_BSY);
}

bool flash::isReadProtected()
{
  uint32_t RDP = (FLASH->OPTCR >> FLASH_OPTCR_RDP_Pos) & 0xFF;
  return RDP != 0xAA;
} 


void flash::SetReadProtectionState(bool enabled)
{
  UnlockOB();
  if (enabled)
  {
    if (!isReadProtected())
    {
    //FLASH->OPTCR = OPTCR | (0x00A5 << FLASH_OPTCR_RDP_Pos);
      *(__IO uint8_t*) 0x40023C15U = OB_RDP_LEVEL_1;
    //FLASH->OPTCR |= FLASH_OPTCR_OPTSTRT;
      *(__IO uint8_t *) 0x40023C14U |= FLASH_OPTCR_OPTSTRT;
      while(FLASH->SR & FLASH_SR_BSY);
    }
  }
  else
  {
    if (isReadProtected())
    {
    //FLASH->OPTCR = OPTCR | (0xAA << FLASH_OPTCR_RDP_Pos);
      *(__IO uint8_t*) 0x40023C15U = OB_RDP_LEVEL_0;
    //FLASH->OPTCR |= FLASH_OPTCR_OPTSTRT;
       *(__IO uint8_t *) 0x40023C14U |= FLASH_OPTCR_OPTSTRT;
      while(FLASH->SR & FLASH_SR_BSY);
    }
  }
  LockOB();
  return;
}