Nucleo-L4r5zi - Flash Erase and Write - Dual Bank

[devtty]

I had no issue writing to and erasing the banks on my nucleo a couple times but all of a sudden it started failing. I unlock the flash successfully clear flash error flags and try do a bank erase:

	FLASH_EraseInitTypeDef erase;
	erase.TypeErase = FLASH_TYPEERASE_MASSERASE;
	erase.Banks = bank_to_erase;
 
 
	if(HAL_FLASHEx_Erase(&erase, &err) != HAL_OK) {
		uint32_t retcode = HAL_FLASH_GetError();
	}

retcode gets set to 0x20000 which corresponds to PEMPTY flag. However the area (bank 2) which I try to erase is not empty when i look at it with StmCubeProgrammer. Furthermore, although I see HAL_FLASH_GetError() return 0x20000 looking at SFR for Flash in the debugger does not show PEMPTY set:I'm not sure if OB are important here but these are my current settings:

Any pointers or ideas appreciated. Thank you.

[Aziz BRIGUI]

Hello @devtty​ ,

Thank you for your feedback,

I suggest checking the WRP Option Bytes .

If the write protection is disabled for bank 2, could you try to do the erase using CubeProgrammer and see if it works ?

Your response will better help us in diagnosing the issue.

Best regards,

Aziz

[devtty]

Hello thank you for the respone. Within stcube programmer here are my values:

 

I have done a full chip erase a couple times now.

Thanks.