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RDP reprogramming not working

Adonis Man

Hi all,

I'm currently working on stm32f4xx controller, i need to protect the flash memory, so i used RDP as stated below, its worked and flash memory was not readable, but after that i was not able to re-program the flash using ULINK Pro or Ulink Me, can you please suggest best way to overcome this.

//HAL_FLASH_Unlock(); HAL_FLASH_OB_Unlock(); FLASH_RDP.RDPLevel = OB_RDP_LEVEL_1; FLASH_RDP.OptionType = OPTIONBYTE_RDP; HAL_FLASHEx_OBProgram(&FLASH_RDP); HAL_FLASH_OB_Launch(); HAL_FLASH_OB_Lock(); HAL_FLASH_Lock();

Thanks.

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  • 0 in reply to Adonis Man

    Heh...
    "It is critically important that you are sharper than the people who might hack your device"

    I gave you working example. I'm using it so I'm sure it works. This text from manual has noting to OptionBytes (really, see NEXT page *1).

    (*1)
    STM32F4xx Reference Manual: page 94 (3.7.3, "Table 17. Access versus read protection level")
    Access to Read/Write/ERase to "Main Flash Memory and Backup SRAM" in Level 1 is disabled.
    Next row:
    "Option Bytes" - in Level 1 you CAN Read/Write/Erase.
    If you cannot erase that OptionBytes, maybe you set Level 2.

Reply
  • 0 in reply to Adonis Man

    Heh...
    "It is critically important that you are sharper than the people who might hack your device"

    I gave you working example. I'm using it so I'm sure it works. This text from manual has noting to OptionBytes (really, see NEXT page *1).

    (*1)
    STM32F4xx Reference Manual: page 94 (3.7.3, "Table 17. Access versus read protection level")
    Access to Read/Write/ERase to "Main Flash Memory and Backup SRAM" in Level 1 is disabled.
    Next row:
    "Option Bytes" - in Level 1 you CAN Read/Write/Erase.
    If you cannot erase that OptionBytes, maybe you set Level 2.

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