Erase - unlock STM32L083

[JR2963]

I am using STM32L083 and need to erase it using J-Link. If it is locked at Level1, I also need to unlock it. My goal is to completely erase the entire Flash memory. I believe I have an error in the process, as I have been unsuccessful in both erasing and unlocking. Could anyone please advise me?

Thank you very much, for any help.

My attempt:

 

 

 

 def eraseMCU(self):
 self.Jlink.connect(self._mcuToConnect, speed = self._swd_speed_khz)
 self.unlockFlash()
 self.unlockOptionBytesArea()
 self.programoptionBytes(RDP_UNLOCK) #0xAA
 self.reloadOptionBytes()
 self.Jlink.reset(ms = 1,halt = False)

 

 

 

where:

 

 

 

 

RDP_UNLOCK = 0xAA

PRGKEY1 = 0x8C9DAEBF
PRGKEY2 = 0x13141516
PEKEY1 = 0x89ABCDEF
PEKEY2 = 0x02030405
OPTKEY1 = 0xFBEAD9C8
OPTKEY2 = 0x24252627

PECR_LOCK_BIT = (1<<0)
PECR_PRGLOCK_BIT = (1<<1)
PECR_OPTLOCK_BIT = (1<<2)
SR_EOP = (1<<1)
SR_BUSY = (1<<0)
OBL_LAUNCH = (1<<18)

FLASH_PECR = 0x40022000+0x4
FLASH_PEKEYR= 0x40022000+0x0C
FLASH_OPTKEYR = 0x40022000+0x14
FLASH_OPTR = 0x40022000+0x1C
FLASH_PRGKEYR = 0x40022000+0x10
FLASH_SR = 0x40022000+0x18


def unlockFlash(self):
 self.busy_wait()
 tmp = self.readU32Mem(FLASH_PECR)
 if (tmp & PECR_LOCK_BIT ) != 0:
 if self.writeU32ToMem(FLASH_PEKEYR,PEKEY1) == True:
 if self.writeU32ToMem(FLASH_PEKEYR,PEKEY2) == True:
 return True
 
def unlockOptionBytesArea(self):
 self.busy_wait()
 tmp = self.readU32Mem(FLASH_PECR)
 if not tmp & PECR_LOCK_BIT:
 if tmp & PECR_OPTLOCK_BIT !=0 :
 if self.writeU32ToMem(FLASH_OPTKEYR,OPTKEY1) == True:
 if self.writeU32ToMem(FLASH_OPTKEYR,OPTKEY2) == True:
 return True
 
def programoptionBytes(self,val):
 val = self.option_bytes_word(val)
 self.writeU32ToMem(0x1FF80000,val)
 self.busy_wait()
 
 flash_sr = self.readU32Mem(FLASH_SR)
 if flash_sr & SR_EOP != 0:
 self.writeU32ToMem(FLASH_SR, SR_EOP)

def reloadOptionBytes(self):
 tmp = self.readU32Mem(FLASH_PECR)
 tmp |= OBL_LAUNCH
 print(hex(tmp))
 self.writeU32ToMem(FLASH_PECR,tmp)