Write Protection NVM

[JeanMBoones]

Reading the documentation online for the BPROT component for the nRF52832, it seems like resetting is the way to clear the Write Protection bits in BPROT. Is resetting the only way to clear the Protection bits or is there another way to clear the bits without resetting? Thanks.

[Sigurd]

From the BPROT Chapter in the Product Specification it is stated that

The only way of clearing protection bits is by resetting the device from any reset source.

A list of reset sources can be found here.

[JeanMBoones]

Thanks. I have another question. Can I set individual blocks (pages) using the BPROT at different points in time and then each block (page) becomes Write Protected until reset. For example, I set page 0 as write protected and then later on I want to set page 5 as write protected. I can do that, right? Or do I only get a single write opportunity to the BPROT component?

[Sigurd]

For example, I set page 0 as write protected and then later on I want to set page 5 as write protected. I can do that, right?

Yes, that is possible.

Note: If the SoftDevice is enabled, you have to use the function sd_flash_protect()

[JeanMBoones]

Thanks Sigurd. Looking at the documentation for sd_flash_protect(), it returns an error if you try to protect the SoftDevice. I am curious as to why this is the case? Why does sd_flash_protect() return NRF_ERROR_FORBIDDEN when trying to protect the Softdevice (with the Softdevice enabled)?

Also, what if the SoftDevice is disabled. Can I directly modify the BPROT component to Write Protect the area of NVM covered by the Softdevice? OR can you not Write Protect the SoftDevice at all regardless of whether it is enabled or disabled?

[JeanMBoones]

Hi Sigurd, could you please answer above question? Thank you.