how to enable readback protection

[nimalhuang]

Hi, Guys,

I am trying to enable the readback protection for the code region 0 and code region 1, I know that the NRF_UICR->RBPCONF register is flash_backed, so I have to include uicr_config.h file and uncomment the line
const uint32_t UICR_RBPCONF attribute((at(0x10001004))) attribute((used)) = 0xFFFF0000;

However, I use eclipse and gcc, so it seems the "at" keyword doesn't apply in eclipse gcc, so is there any equivalence in gcc or how should I enable this readback protection in the application but not using nrfgo, I know that the nrfgo can definitely do that. Thank you:)

[endnode]

Hi,

You can either write UICR->RBPCONF from within the application by something like this:

#if LOCK_UICR
    // Check if read-back mechanism is turned ON.
    if((uint32_t)((NRF_UICR->RBPCONF & UICR_RBPCONF_PALL_Msk) >> UICR_RBPCONF_PALL_Pos) != UICR_RBPCONF_PALL_Enabled) {
        ble_flash_word_write((uint32_t *)&NRF_UICR->RBPCONF, (NRF_UICR->RBPCONF & ~UICR_RBPCONF_PALL_Msk));
    }
#endif

or you can put something like this to the end of your HEX file:

:020000041000EA
:10100000FFFFFFFFFF00FFFFFFFFFFFFFFFFFFFFEF
:00000001FF

[nimalhuang]

Hi, Thank you for your reply. Because I enable softdevice s130, using function ble_flash while softdevice running will halt the cpu and hence cause hard fault, so this is not gonna work.

[Ron]

Is there a possibility to write to flash from the firmware (without using the .hex file) without using the the flash manager library ? 

Why is the flash manager necessary here and why doesn't sd_flash_write() work for me?

Thanks!

[Hung Bui]

@Eran: please create a devzone case for new question. Note that you can freely use sd_flash_write() to access flash. The fstorage flash library is just to help you with the operation queue and retry if the operation's failed.