STM32WB55 - Change RDP level without POR
Hi,
I am currently trying to change RDP level via firmware without a power reset (POR) on a NUCLEO-WB55RG (STM32WB55).
I am facing the problem that after changing the RDP level a power reset is necessary. Without a power reset the device seems to get stuck/frozen. I tried to upgrade the RDP level 0->1 and downgrade 1->0 but both did not work without a power reset.
I found a youtube guide how RDP level can be changed without POR but it was addressed to STML4 family:
https://www.youtube.com/watch?v=f7vs0NwZPFo&ab_channel=STMicroelectronics
I tried to adapt the code for STM32WB55 but without success:
void ChangeRDPLevel()
{
FLASH_OBProgramInitTypeDef tFLASH_OB = { 0x00 };
// Check if flash is unprotected
if ((FLASH->OPTR & FLASH_OPTR_RDP) == OB_RDP_LEVEL_0)
{
// Unlock the FLASH control register access
HAL_FLASH_Unlock();
// Unlock the option bytes block access
HAL_FLASH_OB_Unlock();
// Read option bytes
HAL_FLASHEx_OBGetConfig(&tFLASH_OB);
// Set RDP level
tFLASH_OB.OptionType = OPTIONBYTE_RDP;
tFLASH_OB.RDPLevel = OB_RDP_LEVEL_1;
// Set PRCROP_RDP bit (needed when RDP level set to 1)
// Bit ensures, that flash is cleared when RDP level is decreased
tFLASH_OB.OptionType |= OPTIONBYTE_PCROP;
tFLASH_OB.PCROPConfig = OB_PCROP_RDP_ERASE;
// Program option bytes
HAL_FLASHEx_OBProgram(&tFLASH_OB);
// Launch the option byte loading
//HAL_FLASH_OB_Launch(); -> do NOT use launch because a power reset is necessary after RDP level change
HAL_SuspendTick();
HAL_RTCEx_DeactivateWakeUpTimer(&hrtc);
/*## Clear all related wakeup flags ########################################*/
/* Clear PWR wake up Flag */
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
/* Clear RTC Wake Up timer Flag */
__HAL_RTC_WAKEUPTIMER_CLEAR_FLAG(&hrtc, RTC_FLAG_WUTF);
/*## Setting the Wake up time ##############################################*/
HAL_RTCEx_SetWakeUpTimer_IT(&hrtc, 2000, RTC_WAKEUPCLOCK_RTCCLK_DIV16);
Activate_RDP_1_Go_to_Standby();
/**********************************************************************/
// *** DEVICE SHOULD RESET HERE **** //
/**********************************************************************/
// Locks the option bytes block access
HAL_FLASH_OB_Lock();
// Lock the FLASH control register access
HAL_FLASH_Lock();
}
}
__RAM_FUNC void Activate_RDP_1_Go_to_Standby(void)
{
// HAL_FLASH_OB_Launch();
SET_BIT(FLASH->CR, FLASH_CR_OBL_LAUNCH);
//HAL_PWR_EnterSTANDBYMode;
MODIFY_REG(PWR->CR1, PWR_CR1_LPMS, PWR_LOWPOWERMODE_STANDBY);
/* Set SLEEPDEEP bit of Cortex System Control Register */
SET_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SLEEPDEEP_Msk));
/* This option is used to ensure that store operations are completed */
/* Request Wait For Interrupt */
__WFI();
}
Any ideas how i can change RDP level without POR?
Thanks!