STM32L0 - reset after setting RDP

[JJRR]

Dear,

I am setting RDP to level 1 in my application, After setting it I call System reset HAL_NVIC_SystemReset();

After reset I am expecting the MCU is locked, but it seems I read in code the MCU is still in level 0 so the procedure of setting RDP to level 1 is repeating. Only power disconnect locks the processor to level 1.

Any solution?

Best regards, Jan.

 HAL_FLASHEx_OBGetConfig(&flashTemp);
	if(OB_RDP_LEVEL_0 == flashTemp.RDPLevel)
	{
		HAL_FLASH_OB_Unlock();
		HAL_FLASHEx_OBGetConfig(&pOBInit);
		pOBInit.RDPLevel = 0xBB;
		pOBInit.WRPState = OB_WRPSTATE_ENABLE;
		HAL_FLASHEx_OBProgram(&pOBInit);
		HAL_FLASH_OB_Lock();
		HAL_NVIC_SystemReset();
	}

[TDK]

What chip?

Look at the code:

https://github.com/STMicroelectronics/STM32CubeL0/blob/58c3ec5bb16e3475309da63f64d62efb2782594d/Drivers/STM32L0xx_HAL_Driver/Src/stm32l0xx_hal_flash_ex.c#L327

You need to add:

pOBInit.OptionType = OPTIONBYTE_RDP | OPTIONBYTE_WRP;

if you want to set those options.

[JJRR]

STM32L071

[TDK]

Thanks, I didn't see it initially. I edited my post after asking. See the new answer.

[waclawek.jan]

Funny how problems occur in pairs -- somewhat related.

You might probably need to reload the option bytes after programming, see Reloading Option bytes by software subchapter in RM.

JW