STM32U5四个级别的读保护设置

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设置函数

OB_RDP_LEVEL_0: No protection
OB_RDP_LEVEL_0_5: No debug access to secure area
OB_RDP_LEVEL_1: Read protection of the memory
OB_RDP_LEVEL_2: Full chip protection

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/**
  * @brief  Set the read protection level.
  *
  * @note   To configure the RDP level, the option lock bit OPTLOCK must be
  *         cleared with the call of the HAL_FLASH_OB_Unlock() function.
  * @note   To validate the RDP level, the option bytes must be reloaded
  *         through the call of the HAL_FLASH_OB_Launch() function.
  * @note   !!! Warning : When enabling OB_RDP level 2 it's no more possible
  *         to go back to other levels !!!
  *
  * @param  RDPLevel specifies the read protection level.
  *         This parameter can be one of the following values:
  *            @arg OB_RDP_LEVEL_0: No protection
  *            @arg OB_RDP_LEVEL_0_5: No debug access to secure area
  *            @arg OB_RDP_LEVEL_1: Read protection of the memory
  *            @arg OB_RDP_LEVEL_2: Full chip protection
  *
  * @retval None
  */
static void FLASH_OB_RDPConfig(uint32_t RDPLevel)
{
  /* Check the parameters */
  assert_param(IS_OB_RDP_LEVEL(RDPLevel));

  /* Configure the RDP level in the option bytes register */
  MODIFY_REG(FLASH->OPTR, FLASH_OPTR_RDP, RDPLevel);
}

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