void read_protect(void)
{
if(FLASH_GetReadOutProtectionStatus() != SET)
{
FLASH_Unlock();//不解锁FALSH可能会导致无法正常设置读保护
FLASH_ReadOutProtection(ENABLE);
}
}
/**
* @brief Erases the FLASH option bytes.
* @note This functions erases all option bytes except the Read protection (RDP).
* @note This function can be used for all STM32F10x devices.
* @param None
* @retval FLASH Status: The returned value can be: FLASH_ERROR_PG,
* FLASH_ERROR_WRP, FLASH_COMPLETE or FLASH_TIMEOUT.
*/
FLASH_Status FLASH_EraseOptionBytes(void)
{
uint16_t rdptmp = RDP_Key;
FLASH_Status status = FLASH_COMPLETE;
/* Get the actual read protection Option Byte value */
if(FLASH_GetReadOutProtectionStatus() != RESET)
{
rdptmp = 0x00;
}
/* Wait for last operation to be completed */
status = FLASH_WaitForLastOperation(EraseTimeout);
if(status == FLASH_COMPLETE)
{
/* Authorize the small information block programming */
FLASH->OPTKEYR = FLASH_KEY1;
FLASH->OPTKEYR = FLASH_KEY2;
/* if the previous operation is completed, proceed to erase the option bytes */
FLASH->CR |= CR_OPTER_Set;
FLASH->CR |= CR_STRT_Set;
/* Wait for last operation to be completed */
status = FLASH_WaitForLastOperation(EraseTimeout);
if(status == FLASH_COMPLETE)
{
/* if the erase operation is completed, disable the OPTER Bit */
FLASH->CR &= CR_OPTER_Reset;
/* Enable the Option Bytes Programming operation */
FLASH->CR |= CR_OPTPG_Set;
/* Restore the last read protection Option Byte value */
OB->RDP = (uint16_t)rdptmp;
/* Wait for last operation to be completed */
status = FLASH_WaitForLastOperation(ProgramTimeout);
if(status != FLASH_TIMEOUT)
{
/* if the program operation is completed, disable the OPTPG Bit */
FLASH->CR &= CR_OPTPG_Reset;
}
}
else
{
if (status != FLASH_TIMEOUT)
{
/* Disable the OPTPG Bit */
FLASH->CR &= CR_OPTPG_Reset;
}
}
}
/* Return the erase status */
return status;
}
void FLASH_ReadOutProtection_Enable(void)
// If FLASH readout protection not already set, enable protection and reset device
// NOTES: The user area of the Flash memory can be protected against read by untrusted code.
//Protection is enabled only for firmware compiled with flag RELEASE_PUBLIC set (see makefile).
//When readout protection is set debugging via JTAG is not possible any more.
//If the read protection is set while the debugger is still connected through JTAG/SWD, apply a
//POR (power-on reset) instead of a system reset (without debugger connection).
{
if (FLASH_GetReadOutProtectionStatus() != SET)
{
#ifdef RELEASE_PUBLIC // HINT: define is done via makefile
FLASH_Unlock();
if (FLASH_ReadOutProtection(ENABLE) != FLASH_COMPLETE) // set readout protection
{
// ERROR: could not program read protection
}
else
NVIC_SystemReset(); // protection set --> reset device to enable protection
#else
// output warning message
#endif
}
}
