STM32H5 RDP1 Lock

 

 

 

https://community.st.com/t5/stm32-mcus-security/stm32h503-rdp/td-p/799122

STM32H503 RDP

 

 

void Set_ProductState_Closed(uint8_t Lock)
{
FLASH_OBProgramInitTypeDef OptionsBytesStruct;//create the OB structure
__HAL_RCC_GET_FLAG(RCC_FLAG_IWDGRST);
__HAL_RCC_CLEAR_RESET_FLAGS();
if(Lock == 1){
HAL_FLASHEx_OBGetConfig(&OptionsBytesStruct);
HAL_FLASH_Unlock();
HAL_FLASH_OB_Unlock();
OptionsBytesStruct.ProductState = OB_PROD_STATE_IROT_PROVISIONED; // SET THE PRODUCTION STATE
HAL_FLASHEx_OBProgram(&OptionsBytesStruct);
HAL_FLASH_OB_Launch();HAL_FLASH_OB_Lock();HAL_FLASH_Lock();

HAL_FLASH_Unlock();
HAL_FLASH_OB_Unlock();
OptionsBytesStruct.ProductState = OB_PROD_STATE_CLOSED; // SET THE CLOSED STATE
HAL_FLASHEx_OBProgram(&OptionsBytesStruct);
HAL_FLASH_OB_Launch();HAL_FLASH_OB_Lock();HAL_FLASH_Lock();
NVIC_SystemReset(); // reboot for changes to take effect
}
else{
HAL_FLASHEx_OBGetConfig(&OptionsBytesStruct);
HAL_FLASH_Unlock();
HAL_FLASH_OB_Unlock();
OptionsBytesStruct.ProductState = OB_PROD_STATE_REGRESSION;// full regression
HAL_FLASHEx_OBProgram(&OptionsBytesStruct);
HAL_FLASH_OB_Launch();HAL_FLASH_OB_Lock();HAL_FLASH_Lock();
NVIC_SystemReset();
}
}

 

 

void main(void){

....

 

uint32_t GetOBState =  (FLASH->OPTSR_CUR & FLASH_OPTSR_PRODUCT_STATE);

DEBUGPRINT("OB Stat : %X\r\n", GetOBState);

if(0xED00 == GetOBState){
DEBUGPRINT("RDP\r\n");
Set_ProductState_Closed(1);
}

}