nRF51822: RBPCONF only works after power cycle

[Jeff Katz]

Hi All,

We're wirelessly giving manufacturing information to our devices, and when we're done we want to set the readback protection. We do so like this:

nrf_nvmc_write_word(NRF_UICR->RBPCONF, (UICR_RPBCONF_PALL_Enabled << UICR_RBPCONF_PALL_Pos) | UICR_RBPCONF_PALL_Msk);

and then we reboot: NVIC_SystemReset();

However, we're still able to attach with a debugger and read memory at this point in time. Only after a power cycle does it appear to take effect. This is undesirable--the batteries are at this point in time soldered already.

Thoughts?

[Jeff Katz]

Answered for myself: NRF_UICR->RBPCONF was missing the address-of operator, so the destination was invalid. Also, it's much simpler to write all zeros to RBPCONF, as ultimately that is the desired effect.

[Asbjørn]

Thanks for the update.